Interim report
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1 Instalco Interim report January – September 2026 www.instalco.se Instalco Interim report January – September 2026 Key figures1) 1 For definitions of alternative key figures as per the ESMA guidelines, please see the definitions of key figures at instalco.se. 2 If Fabri’s EBITDA had been included for the full last twelve-month period, rather than for one month, the net debt to EBITDA ratio would have been 2.9. Jul-Sep Jul-Sep Jan-Sep Jan-Sep Rolling Jan-Dec AMOUNTS IN SEK M 2026 2025 ∆% 2026 2025 ∆% 12 months 2025 Net sales 3,526 3,028 16.4 10,838 9,832 10.2 14,604 13,598 EBITDA 366 282 29.8 1,051 829 26.8 1,431 1,209 EBITA 254 180 41.2 730 528 38.2 1,001 800 EBITA margin, % 7.2 6.0 6.7 5.4 6.9 5.9 Operating profit (EBIT) 206 148 39.7 619 428 44.6 859 668 Profit/loss before tax 234 92 153.8 522 306 70.5 739 523 Cash flow from operating activities -66 133 -150.0 272 559 -51.4 723 1,010 Net debt/EBITDA, times 3.3² 3.3 3.3 3.3 3.3 2.8 Cash conversion (12-Month rolling),% 74 112 74 112 74 108 Earnings per share before dilution, SEK 0.70 0.24 185.6 1.42 0.82 74.2 1.89 1.28 Earnings per share after dilution, SEK 0.69 0.24 185.5 1.41 0.82 73.4 1.88 1.28 Order backlog 11,746 9,026 30.1 11,746 9,026 30.1 11,746 9,510 A stronger Instalco emerging July – September 2026 • Net sales increased by 16.4 percent and amounted to SEK 3,526 (3,028) million. Organic growth, adjusted for currency effects, amounted to 8.2 (-3.3) percent. • EBITA amounted to SEK 254 (180) million, corresponding to an EBITA margin of 7.2 (6.0) percent. • Operating profit (EBIT) amounted to SEK 206 (148) million. • Cash flow from operating activities amounted to SEK -66 (133) million. • Earnings per share before dilution were SEK 0.70 (0.24) and after dilution were SEK 0.69 (0.24). • In July, Instalco announced the acquisition of an additional 27 percent of the shares in Fabri AG, bringing Instalco’s ownership to 51 percent of the shares and voting rights. Obtaining control resulted in a positive revaluation effect of SEK 102 million, recognised in net financial items. January - September 2026 • Net sales increased by 10.2 percent and amounted to SEK 10,838 (9,832) million. Organic growth, adjusted for currency effects, amounted to 6.8 (-2.6) percent. • EBITA amounted to SEK 730 (528) million, corresponding to an EBITA margin of 6.7 (5.4) percent. • Operating profit (EBIT) amounted to SEK 619 (428) million. • Cash flow from operating activities amounted to SEK 272 (559) million. • Earnings per share before dilution were SEK 1.42 (0.82) and after dilution were SEK 1.41 (0.82). • Two acquisitions were made during the period, which, on an annual basis, contribute an estimated total sales of SEK 1 135 million.
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2 Instalco Interim report January – September 2026 www.instalco.se CEO Comments For the third quarter, we are delivering improved profitability and organic growth, while continuing to build our order backlog. The margin has also improved compared with Q2, even though seasonal factors typically make the third quarter weak. This is a noteworthy development, demonstrating that our change initiatives are yielding results. Just over a year ago, we set out very clearly what needed to change at Instalco, and since then we have seen the results of our efforts emerge step by step. We are well on our way, but our ambitions remain high and our efforts to develop the company are in full swing. Instalco 2.0 – a continuing process Our decentralised model, built on local entrepreneurship and independent companies, is the foundation of Instalco 2.0. It is within these companies that improvements are made. When we launched Instalco 2.0, we placed considerable emphasis on clear responsibilities, improved follow-up and stronger operational control. It has changed how we work within the Group. Today, there is a whole new sense of drive across our organisation – fresh energy, a forward-looking spirit and a renewed sense of accountability. We are now pressing ahead with even greater drive to strengthen the business. During the quarter, for example, we stepped up our sales training initiatives and provided additional practical support to our subsidiaries. It is all about better equipping our subsidiaries to select the right projects and run their operations more profitably. Instalco 2.0 is not an action plan with a fixed deadline. Continuous improvement needs to be a natural part of our culture, in every company and every project. This work is also about developing our offering. One example is our Finnish start-up Enervion, which was established last year to meet demand for energy storage and which began work on two large-scale battery storage projects during the quarter. Sweden – the driving force behind strong performance Sweden is driving much of the improvement in performance, where the majority of subsidiaries are performing better than a year ago, with several companies performing very well. The development is particularly strong among our companies serving, with their technical expertise and ability to meet specific customer needs contributing to good profitability. This also applies to our industrial scaffolding offering. We are also seeing positive developments in our Finland & Germany segment. Our companies in Finland continue to deliver good results, while our German platform, Fabri, made a positive contribution in its very first month as part of the Group. In Norway, however, earnings continue to be affected by the project delays we previously reported, with several of these major projects now expected to get underway in early 2027. Norway’s earnings for the quarter were also affected by some project-related losses and credit losses. Overall, we are seeing positive organic growth and a marked increase in the order backlog. Although competition for projects remains intense, we are seeing some encouraging signs in the market. Conscious priorities for profitable growth The growing share of industrial customers has a mix effect. This business generates good profitability but ties up more working capital, both due to longer payment terms and a higher proportion of work being invoiced in arrears. Together with substantial invoicing towards the end of the quarter, this has negatively impacted cash conversion. Our accounts receivable are sound, with balances attributable to established customers. Maintaining strong cash flow remains a key priority. During the quarter, we completed the acquisition of our majority stake in Fabri, along with repurchases of minority interests in subsidiaries, resulting in an increase in net debt. The debt related to the acquisition is already fully included, while Fabri has so far contributed only one month of earnings. Including Fabri’s earnings for a full year therefore provides a more representative picture of our leverage. Ambitions remain high Progress over the past year has strengthened our conviction that Instalco has enormous potential. We will continue to develop our existing operations while working to further strengthen the Group over the long term. It is encouraging to see the enthusiasm, commitment and forward- looking spirit evident throughout the organisation. I am proud of what our employees have achieved over the past year and would like to thank everyone for their efforts. Together, we have put the company in an entirely new position for continued growth and development. Per Sjöstrand CEO
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3 Instalco Interim report January – September 2026 www.instalco.se Performance of the Instalco Group Installation market The underlying demand for technical installations and services remains stable, supported by energy efficiency, electrification, digitalisation, and higher requirements for security and resilience. Market sentiment has improved further, with activity gradually increasing, albeit from low levels and with considerable variation across geographical markets and customer groups. Public investment in critical infrastructure, defence and healthcare, together with a rapidly growing data centre build-out, are important drivers in several of Instalco's markets. The installation market remains fragmented and is characterised by highly localised conditions. Competition and pricing pressure remain high in several segments, but a growing number of project opportunities allows for greater selectivity and a focus on profitability. Industry-related investments, the energy transition and the need to modernise ageing property portfolios continue to create favourable long-term prospects for Instalco’s business. Order backlog Order backlog at the end of the period amounted to SEK 11,746 (9,026) million, which is an increase of 30.1 percent. Organically, for comparable units, the order backlog increased, adjusted for currency effects, by 14.2 percent. The order backlog of acquired companies contributed with growth of 12.7 percent. The impact of currency fluctuations was 3.2 percent. For example, the Instalco subsidiary Rörgruppen signed an agreement during the quarter with NCC for installations at a renovation project in central Stockholm. The assignment involves heating and plumbing installations at a city block of historical and cultural significance that will be refurbished and made more accessible. The order value for Instalco is approximately SEK 100 million. Rörgruppen is a subcontractor for NCC and the renovation work is already underway. It is expected to be completed in 2029. Net sales Third quarter Sales for the quarter amounted to SEK 3,526 (3,028) million, which is an increase of 16.4 percent. Adjusted for currency effects, the organic change amounted to 8.2 percent and acquired growth amounted to 6.8 percent. The impact of currency fluctuations was 1.4 percent. January – September Net sales for the period amounted to SEK 10,838 (9,832) million, which is an increase of 10.2 percent. Adjusted for currency effects, the organic change amounted to 6.8 percent and acquired growth amounted to 3.0 percent. The impact of currency fluctuations was 0.4 percent. Earnings Third quarter Operating profit before amortisation of acquired intangible assets (EBITA) for the period amounted to SEK 254 (180) million, which corresponds to an EBITA margin of 7.2 (6.0) percent. Segment Sweden is the main driver of the improvement, with an additional contribution from the consolidation of Fabri, whose earnings for one month were included during the quarter. Operating profit (EBIT) for the quarter amounted to SEK 206 (148) million. Amortisation and impairment of acquired intangible assets amounted to SEK 48 (33) million. Net financial items for the quarter amounted to SEK 28 (-55) million, of which unrealised value changes amounted to SEK -29 (- 1) million, interest expense for leasing to SEK -6 (-7) million and the interest expense on external loans to SEK -36 (-34) million. Acquiring a controlling interest in Fabri AG resulted in a positive revaluation effect of SEK 102 million attributable to the former shareholding in the associated company. Tax for the quarter was SEK -32 (-17) million, which corresponds to an effective tax rate of 14 (19) percent. The lower tax rate is primarily attributable to a revaluation effect arising from the step acquisition of Fabri AB, which is recognised only at Group level and therefore does not affect taxation at the legal entity level. Earnings for the quarter were SEK 201 (75) million, which corresponds to earnings per share before dilution of SEK 0.70 (0.24) and earnings per share after dilution of SEK 0.69 (0.24). January – September Operating profit before amortisation of acquired intangible assets (EBITA) for the period amounted to SEK 730 (528) million, which corresponds to an EBITA margin of 6.7 (5.4) percent. The margin in the previous year, excluding items affecting comparability, was 6.1 percent. Items affecting comparability then amounted to SEK -75 million, attributable to an impairment loss on accounts receivable that was recognised in the first quarter, along with remuneration to the outgoing President and CEO that was recognised in the second quarter. Operating profit (EBIT) for the period amounted to SEK 619 (428) million. Amortisation and impairment of acquired intangible assets amounted to SEK 111 (100) million. Net financial items for the period amounted to SEK -97 (-122) million, of which unrealised currency changes amounted to SEK - 62 (19) million, interest expense for leasing to SEK -18 (-20) million and the interest expense on external loans to SEK -93 (-97) million. Acquiring a controlling interest in Fabri AG resulted in a positive revaluation effect of SEK 102 million. Net sales per quarter, SEK m EBITA PER QUARTER, SEK m 0 10 000 20 000 0 2 000 4 000 6 000 Q2 Q4 Q2 Q4 Q2 Q4 Q2 Q4 Q2 22 23 24 25 26 Net sales by quarter (left axis) Net sales rolling 12 months (right axis) 0 500 1 000 1 500 0 200 400 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 22 23 24 25 26 EBITA by quarter (left axis) EBITA rolling 12 months (right axis)
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4 Instalco Interim report January – September 2026 www.instalco.se Tax for the quarter was SEK -89 (-62) million, which corresponds to an effective tax rate of 17 (20) percent. The lower tax rate is primarily attributable to a revaluation effect arising from the step acquisition of Fabri AB, which is recognised only at Group level and therefore does not affect taxation at the legal entity level. Earnings for the period were SEK 432 (244) million, which corresponds to earnings per share before dilution of SEK 1.42 (0.82) and earnings per share after dilution of SEK 1.41 (0.82). Cash flow Third quarter Cash flow from operating activities amounted to SEK -66 (133) million, of which the change in working capital was SEK -281 (-60) million. The Group’s working capital fluctuates from one quarter to the next primarily because of fluctuations in these line items: work-in-progress, accounts receivable and accounts payable. Cash flow from investing activities amounted to SEK -270 (-91) million, of which the acquisition of subsidiaries and businesses amounted to SEK -227 (-4) million, the acquisition of shares in the then associated company Fabri AG amounted to SEK 0 (-67) million and other items to SEK -44 (-19) million. Cash flow from financing activities amounted to SEK 504 (-413) million, of which the net change in loans amounted to SEK 788 (- 175) million, amortisation of lease liabilities to SEK -85 (-80) million and the change in non-controlling interests to SEK -200 (-160) million. January – September Cash flow from operating activities amounted to SEK 272 (559) million, with a change in working capital of SEK -339 (79) million. The Group’s working capital fluctuates from one quarter to the next primarily because of fluctuations in these line items: work-in- progress, accounts receivable and accounts payable. Cash flow from investing activities amounted to SEK -402 (-315) million, of which the acquisition of subsidiaries and businesses amounted to SEK -283 (-154) million and acquisition of shares in associated companies amounted to SEK 0 (-99) million and other to SEK -120 (-62) million. Cash flow from financing activities amounted to SEK -79 (-385) million, of which the net change in loans amounted to SEK 449 (195) million, the change of non-controlling interests to SEK -140 (- 160) million and amortisation of lease liabilities to SEK -256 (-240) million. Dividends of SEK 0.50 (0.68) per share were paid out during the period, which corresponds to SEK -135 (-182) million. Financial position Equity at the end of the period amounted to SEK 3,852 (3,332) million, with an equity ratio of 31.4 (32.5) percent. Interest-bearing debt including leasing at the end of the period amounted to SEK 4,927 (3,835) million, of which leasing amounts to SEK 878 (650) million. As of the end of the period, Instalco’s total credit facility, including unutilised credit, amounted to a total of SEK 4,225 (3,850) million, of which SEK 3,608 (3,150) million had been utilised. In addition, debts that had not yet been integrated into the central financing amounted to SEK 349 million (30 million). These debts are not included in the amounts stated above. Cash and cash equivalents at the end of the period amounted to SEK 204 (67) million. Interest-bearing net debt at the end of the period amounted to SEK 4,724 (3,769) million, with a gearing ratio of 128.6 (118.9) percent. Net debt in relation to EBITDA was 3.3 (3.3) times, which is higher than the target that it should not exceed 2.5 times. At the end of the quarter, the Group had a margin to the limits of its loan covenants, which are the ratio of net debt/EBITDA and interest coverage. Currency changes impacted interest-bearing net debt by SEK -12 (-5) million. Had Fabri's EBITDA been included for the full rolling 12-month period, rather than just one month, the net debt in relation to EBITDA would have been 2.9. During the quarter, Instalco increased its existing financing by adding SEK 375 million to the credit facility, taking it from SEK 3,400 million to SEK 3,775 million. This was made within the framework of the existing agreement, with unchanged terms and maturities, thereby strengthening financial flexibility. Parent Company The main operations of Instalco AB are group-wide management and administration, along with finance and accounting. The comments below pertain to the period 1 January through 30 September 2026. Net sales for the Parent Company amounted to SEK 13 (11) million. Operating profit was SEK -3 (-13) million. Net financial items amounted to SEK 126 (172) million. Earnings before taxes were SEK 123 (159) million and earnings for the period were SEK 123 (159) million. Transactions with related parties Besides remuneration to senior executives, there were no transactions between Instalco and related parties that had a significant impact on the company’s financial position or earnings during the period. Risks and uncertainties The Instalco Group is active in the Nordic and German market and it has a decentralised structure whereby each unit runs its own operations, with a large number of customers and suppliers. The business model limits the aggregated business and financial risks. Instalco’s earnings and financial position, as well as its strategic position, are affected by several of internal factors that Instalco has control over, as well as some external factors where the ability to impact the outcome is limited. The most significant risk factors are the state of economy and market situation, including inflation and interest rates, along with structural changes and competition, which impact the demand for new construction of homes and offices, as well as investments from the public sector and industry. The demand for service is less impacted by these risk factors. Ongoing geopolitical and trade conflicts do not currently have a significant direct impact on Instalco’s sales or purchases. The indirect effects, such as reduced willingness to invest among customers, potential disturbances in logistics chains and rising prices for raw materials that are not possible to compensate for in our own contracts, could however impact some of the subsidiaries in the Group. Instalco is monitoring developments carefully, but it is currently difficult to assess what future consequences these conflicts could have on the market and economy. For more information, please see the section on Risks (pages 48- 51) in the 2025 Annual Report. The Parent Company is indirectly impacted by the aforementioned risks and uncertainties. As of the third quarter, Fabri AG is consolidated as a subsidiary, having previously been accounted for as an associate. The Group’s exposure to the German market has therefore increased. The operations in Germany are considered to be exposed to essentially the same types of risks as the Group’s other operations. Apart from this, there have been no material changes in the Group’s risks and uncertainties, or in the assessment thereof, compared with the description in the 2025 Annual Report.
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5 Instalco Interim report January – September 2026 www.instalco.se Significant events during the reporting period On 19 March, Per Sjöstrand was appointed permanent President and CEO of Instalco. He had been in that position as the acting President and CEO since 1 August 2025. On 24 March, Instalco published restated historical financial information associated with implementation of its new country- based segment reporting. The restated information only affects the allocation between segments and does not impact the Group’s total net sales or EBITA. However, it has affected the reported figures for segment Sweden. On 16 April, Instalco entered into an agreement to acquire 70 percent of the shares in Defensio Invest AB, which is a group of companies run under the brand of TSM Taksäkerhetsmontörerna. TSM along with the Instalco subsidiaries Highcon and Enter Ställningar, together provide a nationwide platform for construction and industrial scaffolding, weather protection and safety solutions. On 29 June, Instalco utilised a one-year extension option on the existing credit facility agreement with Danske Bank A/S, Skandinaviska Enskilda Banken AB and AB Svensk Exportkredit. Following the extension, the credit facility will run until 2028, with the option for another one-year extension. On 16 July, Instalco announced that it had entered into an agreement to acquire another 27 percent of the shares in Fabri AG. Upon completion of the transaction, Instalco’s holding increased to 51 percent of the voting rights and share capital, thereby becoming a majority shareholder. Fabri is consolidated as of 1 August 2026 and reported with a one-month lag, meaning that one month of Fabri’s results will be included in Instalco’s consolidated financial statements for the third quarter of 2026 for Segment Finland & Germany. Significant events after the end of the reporting period Nothing to report.
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6 Instalco Interim report January – September 2026 www.instalco.se Operations in Sweden Market The Swedish installation market continues to improve, with growing indications of increased activity following several weak years. The recovery is most evident in the major metropolitan areas, with tentative signs of an upturn in residential construction from low levels. Public investment in critical infrastructure, defence and healthcare, together with a growing data centre market, are driving demand. Challenges remain, however, including high construction costs, lengthy decision-making processes and continued caution in private investment. There are positive developments in the engineering consultancy market, with growing demand particularly in the defence industry, hospitals, data centres and other critical infrastructure. Long-term conditions in the automation sector are also favourable, driven by digitalisation, electrification and growing demand for connected and energy-efficient solutions. The industrial market remains mixed, although investments in defence, electrical power and technical infrastructure are contributing to positive developments in several areas. Order backlog Order backlog at the end of the period amounted to SEK 7,316 (6,303) million, which is a change of 16.1 percent. Organically, for comparable units, order backlog increased by 14.9 percent. The order backlog of acquired companies contributed with growth of 1.2 percent. For example, the Instalco subsidiary Inmatiq signed a framework agreement during the quarter with Region Blekinge for building automation solutions at the region’s hospitals and healthcare centres. The assignment covers such things as development, programming, commissioning, modernisation and technical management of automation systems. The estimated contract volume for Instalco amounts to approximately SEK 30 million. The agreement runs for two years, with an option to extend it for a further two years, and covers a property portfolio totalling approximately 275,000 square metres. Net sales Third quarter Sales for the quarter amounted to SEK 2,437 (2,075) million, which is an increase of 17.4 percent. The organic growth amounted to 15.2 percent and acquired growth was 2.2 percent. January – September Net sales for the period amounted to SEK 7,711 (7,026) million, which is an increase of SEK 685 million. Organic growth amounted to 8.1 percent and acquired growth was 1.6 percent. Earnings Third quarter EBITA for the quarter was SEK 179 (105) million, which corresponds to an EBITA margin of 7.4 (5.0) percent. Operating profit (EBIT) amounted to SEK 162 (89) million. The improvement in profitability reflects higher volumes and continued operational improvements, with positive developments broadly across the business areas and particularly strong performance among companies serving industrial clients. January – September EBITA for the period amounted to SEK 499 (372) million, which corresponds to a EBITA margin of 6.5 (5.3) percent. Operating profit/loss was SEK 454 (324) million. The margin in the previous year, excluding items affecting comparability, was 6.3 percent. Items affecting comparability then amounted to SEK -64 million, attributable to an impairment loss on accounts receivable that was recognised in the first quarter. Net sales per quarter, SEK m EBITA PER QUARTER, SEK m Key figures for Sweden 0 5 000 10 000 15 000 0 1 000 2 000 3 000 Q2Q3Q4Q1Q2Q3Q4Q1Q2Q3Q4Q1Q2Q3Q4Q1Q2Q3 22 23 24 25 26Net sales by quarter (left axis) Net sales rolling 12 months (right axis) 0 500 1 000 0 100 200 300 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 22 23 24 25 26 EBITA by quarter (left axis) EBITA rolling 12 months (right axis) Jul-Sep Jul-Sep Jan-Sep Jan-Sep Rolling Jan-Dec AMOUNTS IN SEK M 2026 2025 ∆% 2026 2025 ∆% 12 months 2025 Net sales 2,437 2,075 17.4 7,711 7,026 9.7 10,374 9,690 EBITA 179 105 71.3 499 372 34.4 677 549 EBITA margin, % 7.4 5.0 6.5 5.3 6.5 5.7 Order backlog 7,316 6,303 16.1 7,316 6,303 16.1 7,316 6,612
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7 Instalco Interim report January – September 2026 www.instalco.se Operations in Norway Market The Norwegian installation market remains challenging, although there are signs of stabilisation following several weak years. New- build activity, particularly in residential construction, remains low, while public investment, commercial property and renovation projects offer better opportunities. High costs and continued uncertainty are dampening the pace of investment, with the start of several projects delayed further, in some cases until 2027. The data centre market, however, is experiencing strong growth, driven by increasing demand for capacity to support AI, cloud services and digitalisation. Several major projects are underway or in the planning stages, creating opportunities for technical installation companies. Order backlog Order backlog at the end of the period amounted to SEK 2,585 (1,909) million, which is an increase of 35.4 percent. Organically, for comparable units, the order backlog grew, adjusted for currency effects, by 22.9 percent. The order backlog of acquired companies contributed with growth of 0 percent. The impact of currency fluctuations was 12.6 percent. For example, the Instalco subsidiaries Urd Klima Sandnes and Intec signed agreements during the quarter for the design and installation of solutions at a new office building that is being constructed in Stavanger. The assignment covers the design of heating, plumbing and ventilation systems for a 35,000-square- metre building, along with the installation of a fully integrated air handling system incorporating heating and cooling. The order value for Instalco is approximately NOK 40 million. The building, which will serve as Vår Energi’s headquarters, will be submitted for BREEAM-NOR Excellent and WELL Core Gold certification. It is expected to be completed in 2028. Net sales Third quarter Sales for the quarter amounted to SEK 553 (518) million, which is an increase of 6.8 percent. Organic change, adjusted for currency effects, amounted to -1.7 percent and acquired growth was 0 percent. The impact of currency fluctuations was 8.5 percent. January – September Net sales for the period amounted to SEK 1,729 (1,628) million, which is an increase of SEK 101 million. Organic growth, adjusted for currency effects, amounted to 2.4 percent and acquired growth was 0 percent. The impact of currency fluctuations was 3.8 percent. Earnings Third quarter EBITA for the quarter was SEK 20 (28) million, which corresponds to an EBITA margin of 3.5 (5.4) percent. Operating profit (EBIT) amounted to SEK 3 (13) million. A few companies reported project- related losses along with credit losses, which impacted profitability in the quarter. Furthermore, delays to the start of major projects mean that the anticipated earnings contribution has yet to materialise. January – September EBITA for the period amounted to SEK 87 (83) million, which corresponds to a EBITA margin of 5.1 (5.1) percent. Operating profit/loss was SEK 42 (39) million. Net sales per quarter, SEK m EBITA PER QUARTER, SEK m Key figures for Norway 0 1 000 2 000 3 000 0 500 1 000 Q2Q3Q4Q1Q2Q3Q4Q1Q2Q3Q4Q1Q2Q3Q4Q1Q2Q3 22 23 24 25 26 Net sales by quarter (left axis) Net sales rolling 12 months (right axis) 0 100 200 0 20 40 60 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 22 23 24 25 26 EBITA by quarter (left axis) EBITA rolling 12 months (right axis) Jul-Sep Jul-Sep Jan-Sep Jan-Sep Rolling Jan-Dec AMOUNTS IN SEK M 2026 2025 ∆% 2026 2025 ∆% 12 months 2025 Net sales 553 518 6.8 1,729 1,628 6.2 2,356 2,255 EBITA 20 28 -30.2 87 83 5.8 121 116 EBITA margin, % 3.5 5.4 5.1 5.1 5.1 5.1 Order backlog 2,585 1,909 35.4 2,585 1,909 35.4 2,585 2,188
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8 Instalco Interim report January – September 2026 www.instalco.se Operations in Finland and Germany Market There are tentative signs of improvement in the Finnish installation market, although the recovery remains slow and competition is still intense. Conventional construction activity remains weak, while data centres, electrification and industry- related investments are driving demand, including from international companies. The expansion of data centres is expected to gradually affect market capacity and contribute to improved competitive conditions in other segments as well. The German installation market is showing signs of recovery, with considerably more positive sentiment than in the economy as a whole. The market is very fragmented and characterised by highly localised market conditions. Energy efficiency improvements, property modernisation and increasing requirements for technical installations are creating long-term opportunities. Order backlog Order backlog at the end of the period amounted to SEK 1,845 (814) million, which is a change of 126.6 percent. Organically, for comparable units, the order backlog, adjusted for currency effects, changed by -11.3 percent. Acquired growth in the order backlog amounted to 132.3 percent. The impact of currency fluctuations was 5.6 percent. For example, during the quarter, the Instalco subsidiary Milvent Oy signed an agreement for ventilation installations at Malmi Comprehensive School in Helsinki. The assignment covers all of the ventilation installations required for the project. The order value for Instalco is approximately EUR 2 million. The project is being carried out on behalf of Jalon Uusimaa Oy, with ventilation work scheduled to begin in early 2027 and the overall project running until 2028. Net sales Third quarter Sales for the quarter amounted to SEK 536 (435) million, which is an increase of 23.2 percent. The organic change, adjusted for currency effects, amounted to -13.3 percent and acquired growth was 36.9 percent. The impact of currency fluctuations was -0.4 percent. January – September Net sales for the period amounted to SEK 1,398 (1,178) million, which is an increase of SEK 220 million. Organic growth, adjusted for currency effects, amounted to 5.2 percent and acquired growth was 15.7 percent. The impact of currency fluctuations was -2.2 percent. Earnings Third quarter EBITA for the quarter was SEK 56 (48) million, which corresponds to an EBITA margin of 10.4 (11.0) percent. Operating profit (EBIT) amounted to SEK 41 (45) million. Growth in earnings is attributable to a continued strong contribution from companies serving industrial clients and improvement compared to the previous quarter for large parts of the conventional installation operations, along with a positive impact from the consolidation of Fabri, whose earnings were included for one month during the quarter. January – September EBITA for the period amounted to SEK 142 (85) million, which corresponds to a EBITA margin of 10.2 (7.2) percent. Operating profit/loss was SEK 122 (75) million. Net sales per quarter, SEK m EBITA PER QUARTER, SEK m Key figures Finland & Germany 0 500 1 000 1 500 2 000 0 200 400 600 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 22 23 24 25 26 Net sales by quarter (left axis) Net sales rolling 12 months (right axis) 0 100 200 300 0 20 40 60 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 22 23 24 25 26 EBITA by quarter (left axis) EBITA rolling 12 months (right axis) Jul-Sep Jul-Sep Jan-Sep Jan-Sep Rolling Jan-Dec AMOUNTS IN SEK M 2026 2025 ∆% 2026 2025 ∆% 12 months 2025 Net sales 536 435 23.2 1,398 1,178 18.7 1,874 1,653 EBITA 56 48 16.6 142 85 68.2 198 140 EBITA margin, % 10.4 11.0 10.2 7.2 10.6 8.5 Order backlog 1,845 814 126.6 1,845 814 126.6 1,845 710
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9 Instalco Interim report January – September 2026 www.instalco.se Acquisitions Instalco made two acquisitions during the period January through September. One of the acquisitions was partly financed through the transfer of 310,545 shares held in treasury by Instalco. The value of the shares amounted to SEK 11.7 million. Acquisition costs for the period amount to SEK 3 (0) million and they are reported among Other operating expenses in the income statement. Instalco typically applies an acquisition structure that consists of the purchase price and contingent consideration. Payment of contingent consideration is based on future results. Companies that achieve higher profits over a specified period of time will thus be paid a higher amount of contingent consideration. Contingent consideration is paid within three years of the acquisition date and there is a fixed maximum level. The Group’s goodwill is the result of ongoing acquisition efforts. The amount allocated to goodwill on the acquisition date corresponds to the cost of acquisition less the fair value of the acquired net assets. The value of goodwill is motivated by the earnings capacity of our companies, and it represents the future economic benefits of collaboration between subsidiaries, cross- selling and joint purchasing. The benefits have not, however, been individually identified or reported separately. At the end of the period, the Group’s total goodwill amounted to SEK 6,219 (5,259) million. Consolidated goodwill is tested for impairment as needed and at least once per year by looking at each cash-generating unit. Other identified goodwill, such as customer relations and the order backlog, have been measured at present value of future cash flows and as a rule, is amortised over a period of 3 to 10 years. Instalco’s acquired net sales over the last 12-month period (RTM), in accordance with the assessed situation on the acquisition date, amounted to SEK 1,135 million. Fabri Instalco’s ownership of Fabri is via a multi-step, option-based plan. On 17 March 2025, step one was taken when Instalco acquired a 24 percent share in both voting rights and share capital in Fabri AG. On 16 July 2026, Instalco announced that it had entered into an agreement implement step two by acquiring another 27 percent of the shares in Fabri AG. Once that was completed, Instalco’s holding increased to 51 percent of the voting rights and share capital, thereby becoming a majority shareholder. Fabri is included in Instalco’s consolidated financial statements as of 1 August 2026 and reported with a one-month lag, meaning that one month of its results are included in the third quarter. Step three covers the option to acquire an additional 17 percent of the shares, subject to the Fabri Group meeting the agreed earnings thresholds. For more information on acquisition-related items, see Note 4 Impact of acquisitions and Note 5 Shares in associated companies. Company acquisitions Instalco made the following company acquisitions during the period January – September 2026. 1 Pertains to the assessed annual sales on the acquisition date, based on the most recent financial year that was subject to audit. Access gained Acquisition Discipline Segment Share of the votes and capital Net sales, SEK million¹ Number of employees April TSM Taksäkerhetsmontörerna (Defensio Invest AB) Industry Sweden 70% 190 60 August Fabri AG Multi-discipline Finland & Germany 51% 945 800 Add-on acquisitionFebruary Total 1,135 860
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10 Instalco Interim report January – September 2026 www.instalco.se Financial reporting Condensed consolidated income statement and statement of comprehensive income 1 Instalco has three outstanding warrants schemes corresponding to a total of 3,244,311 shares. Jul-Sep Jul-Sep Jan-Sep Jan-Sep Rolling Full-year AMOUNTS IN SEK M Not 2026 2025 2026 2025 12 months 2025 Net sales 3 3,526 3,028 10,838 9,832 14,604 13,598 Other operating revenue 22 27 64 95 101 132 Operating income 3,548 3,054 10,902 9,927 14,705 13,730 Materials and purchased services -1,697 -1,444 -5,145 -4,617 -6,907 -6,379 Other external expenses -292 -238 -851 -825 -1,149 -1,123 Personnel costs -1,192 -1,088 -3,843 -3,646 -5,201 -5,004 Depreciation and amortization of tangible and intangible fixed assets -160 -134 -433 -401 -572 -541 Other operating expenses -1 -3 -13 -10 -17 -15 Operating costs -3,342 -2,907 -10,284 -9,499 -13,846 -13,062 Operating profit (EBIT) 206 148 619 428 859 668 Net financial items 28 -55 -97 -122 -120 -145 Profit/loss before tax 234 92 522 306 739 523 Tax on profit for the period -32 -17 -89 -62 -175 -147 Profit/loss for the period 201 75 432 244 564 376 Other comprehensive income Exchange rate difference when translating subsidiaries abroad 121 -7 251 -90 184 -158 Comprehensive income for the period 322 68 684 154 748 218 Comprehensive income for the period attributable to: Parent Company's shareholders 308 59 634 128 692 186 Non-controlling interests 14 9 50 26 57 33 Earnings per share for the period, before dilution, SEK 0.70 0.24 1.42 0.82 1.89 1.28 Earnings per share for the period, after dilution, SEK 0.69 0.24 1.41 0.82 1.88 1.28 Average number of shares before dilution¹ 268,754,752 268,754,752 268,754,752 267,407,585 268,754,752 267,744,377 Average number of shares after dilution¹ 269,936,252 268,754,752 269,936,252 267,407,585 269,612,627 267,744,377
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11 Instalco Interim report January – September 2026 www.instalco.se Condensed consolidated balance sheet 30 Sep 30 Sep 31 Dec AMOUNTS IN SEK M Note 2026 2025 2025 ASSETS Goodwill 4 6,219 5,259 5,210 Right of use asset 891 666 677 Other non-current assets 5 1,263 1,080 1,049 Total non-current assets 8,373 7,004 6,936 Accounts receivable 2,078 1,802 1,839 Contract assets 1,004 777 551 Other current assets 594 590 594 Cash and cash equivalents 204 67 348 Total current assets 3,880 3,237 3,331 Total assets 12,254 10,241 10,267 Equity and liabilities Equity 3,672 3,169 3,228 Non-controlling interests 180 163 170 Total equity 3,852 3,332 3,397 Non-current liabilities 4,403 3,523 3,421 Lease liabilities 557 378 382 Total non-current liabilities 4,960 3,901 3,803 Lease liabilities 321 272 276 Trade payables 1,303 1,128 989 Contract liabilities 547 592 521 Other current liabilities 1,271 1,016 1,280 Total current liabilities 3,442 3,008 3,066 Total liabilities 8,402 6,909 6,870 Total equity and liabilities 12,254 10,241 10,267 Of which interest-bearing liabilities 4,927 3,835 3,791 Equity attributable to: Parent Company shareholders 3,672 3,169 3,228 Non-controlling interests 180 163 170
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12 Instalco Interim report January – September 2026 www.instalco.se Statement of changes in equity AMOUNTS IN SEK M N o t e Share capital Other contributed capital Translation reserve Accumulated profit or loss incl.profit (loss) for the year Total Non- controlling interests Total equity Opening balance 2026-01-01 ID 1 1,264 -148 2,110 3,228 170 3,397 Profit/loss for the period - - - 383 383 50 432 Translation effect for the period fo foreign operations - - 251 - 251 -15 237 Comprehensive income for the period - - 251 383 634 35 669 Transactions with owners Dividends - - - -135 -135 -0 -135 Change in non-controlling interests - - - -58 -58 -24 -82 Change in warrants - - - 3 3 - 3 Total transactions with owners - - - -190 -190 -24 -214 Closing balance 2026-09-30 1 1,264 103 2,303 3,672 180 3,852 AMOUNTS IN SEK M N o t Share capital Other contributed capital Translation reserve Accumulated profit or loss incl.profit (loss) Total Non- controlling interests Total equity Opening balance 2025-01-01 1 1,126 10 2,072 3,209 173 3,382 Profit/loss for the period - - - 219 219 26 244 Translation effect for the period fo foreign operations - - -90 - -90 -0 -91 Comprehensive income for the period - - -90 219 128 25 153 Transactions with owners New issues 0 138 - - 138 - 138 Dividends - - - -182 -182 0 -182 Change in non-controlling interests - - - -126 -126 -36 -161 Change in warrants - - - 2 2 - 2 Total transactions with owners 0 138 - -307 -169 -35 -205- - - - - - - Closing balance 2025-09-30 1 1,264 -80 1,984 3,169 163 3,332
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13 Instalco Interim report January – September 2026 www.instalco.se Condensed consolidated cash flow statement Jul-Sep Jul-Sep Jan-Sep Jan-Sep Rolling Full-year AMOUNTS IN SEK M Note 2026 2025 2026 2025 12 months 2025 Cash flow from operating activities Profit/loss before tax 234 92 522 306 739 523 Adjustments for non-cash items 96 197 411 475 541 605 Tax paid -115 -96 -322 -301 -331 -310 Changes in working capital -281 -60 -339 79 -226 192 Cash flow from operating activities -66 133 272 559 723 1,010 Investing activities Acquisitions and divestments of subsidiaries and businesses 4 -227 -4 -283 -154 -284 -155 Investments in other financial assets 5 -0 -67 -0 -99 -0 -99 Other -44 -19 -120 -62 -152 -94 Cash flow from investing activities -270 -91 -402 -315 -435 -348 Financing activities Warrants 3 2 3 2 3 2 Change in non-controlling interests -200 -160 -140 -160 -140 -160 Dividends - - -135 -182 -135 -183 Net change of loan 788 -175 449 195 436 181 Amortisation leasing -85 -80 -257 -240 -344 -327 Cash flow from financing activities 504 -413 -79 -385 -180 -487 Cash flow for the period 167 -371 -209 -142 107 176 Cash and cash equivalents at the beginning of the period 4 421 348 208 67 208 Translation differences in cash and cash equivalents 33 17 66 1 30 -35 Cash and cash equivalents at the end of the period 204 67 204 67 204 348
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14 Instalco Interim report January – September 2026 www.instalco.se Condensed Parent Company income statement Condensed Parent Company balance sheet Jul-Sep Jul-Sep Jan-Sep Jan-Sep Rolling Full-year AMOUNTS IN SEK M 2026 2025 2026 2025 12 months 2025 Net sales 4 2 13 11 15 14 Operating costs -5 -3 -16 -25 -19 -28 Operating profit (EBIT) -1 -0 -3 -13 -5 -14 Net financial items -3 -3 126 172 121 167 Profit/loss after net financial items -4 -4 123 159 117 153 Group contribution received - - - - 24 24 Profit/loss before tax -4 -4 123 159 141 177 Income tax - - - - -1 -1 Profit/loss and comprehensive income for the period -4 -4 123 159 139 175 30 Sep 30 Sep 31 Dec AMOUNTS IN SEK M 2026 2025 2025 ASSETS Financial assets 1,526 1,514 1,514 Deferred tax asset 3 3 3 Total non-current assets 1,529 1,517 1,517 Other current assets 2 5 24 Cash and cash equivalents 3 6 5 Total current assets 5 10 29 Total assets 1,534 1,528 1,546 Equity and liabilities Equity 1,384 1,362 1,378 Total equity 1,384 1,362 1,378 Non-current liabilities 145 141 144 Current liabilities 6 24 24 Total liabilities 150 166 168 Total equity and liabilities 1,534 1,528 1,546
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15 Instalco Interim report January – September 2026 www.instalco.se Quarterly data AMOUNTS IN SEK M Q3 2026 Q2 2026 Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Income statement Net sales 3,526 3,874 3,438 3,766 3,028 3,512 3,293 3,610 Growth in net sales, % 16.4 10.3 4.4 4.3 -3.7 -3.9 0.3 -6.8 EBITDA 366 382 303 380 282 325 222 302 EBITDA margin, % 10.4 9.9 8.8 10.1 9.3 9.3 6.7 8.4 EBITA 254 274 201 272 180 225 123 195 EBITA margin, % 7.2 7.1 5.8 7.2 6.0 6.4 3.7 5.4 Operating profit (EBIT) 206 242 170 240 148 192 88 126 Operating profit/loss (EBIT), % 5.8 6.2 5.0 6.4 4.9 5.5 2.7 3.5 Profit/loss before tax 234 179 109 217 92 151 63 72 Profit/loss for the period 201 145 87 132 75 120 49 34 Equity, provisions and liabilities Return on equity, % 16.4 13.2 12.7 11.7 8.7 9.1 9.5 11.3 Return on capital employed, % 12.7 11.1 10.5 9.6 7.9 7.9 8.6 10.1 Interest-bearing net debt 4,724 3,562 3,343 3,444 3,769 3,573 3,479 3,458 Gearing ratio, % 128.6 102.2 98.5 106.7 118.9 111.0 106.0 107.8 Net debt/EBITDA, times 3.3 2.6 2.6 2.8 3.3 3.1 2.9 2.7 Key financial performance indicatiors Working capital 582 321 150 220 459 328 325 314 Equity ratio, % 31.4 35.2 35.0 33.1 32.5 32.1 34.1 32.8 Cash conversion (rolling 12 months), % 74 90 100 108 112 107 96 89 Cash flow from operating activities -66 104 234 451 133 202 223 471 Order backlog Order backlog 11,746 10,937 10,375 9,510 9,026 9,347 9,019 9,002 Key figures, employees Average number of employees 6,396 6,085 6,001 6,042 6,050 5,997 6,076 6,139 Number of employees at the end of the period 7,107 6,291 6,163 6,123 6,180 6,215 6,199 6,197 Acquisition-related items Revaluation of contingent consideration 7 1 1 5 10 -2 2 15 Acquisition costs 0 -3 -0 - - -0 -0 -1 Total acquisition-related items 7 -2 0 5 10 -2 2 14 Key figures per share SEK Average number of shares before dilution 268,754,752 268,754,752 268,754,752 268,754,752 268,754,752 266,734,001 264,713,250 264,107,025 Average number of shares after dilution 269,936,252 271,004,752 268,754,752 268,754,752 268,754,752 266,734,001 264,713,250 264,107,025 Profit/loss for the period attributable to the Parent Company´s shareholders 187 122 73 125 66 111 42 37 Earnings per share for the period before dilution, SEK 0.70 0.46 0.27 0.47 0.24 0.42 0.16 0.14 Earnings per share for the period after dilution, SEK 0.69 0.45 0.27 0.47 0.24 0.42 0.16 0.14 Cash flow from operating activities per share, SEK -0.25 0.38 0.87 1.68 0.49 0.76 0.84 1.78 Equity per share, SEK 13.60 12.87 12.63 12.01 11.79 12.07 12.40 12.15 Share price at the end of the period, SEK 42.90 38.24 31.16 25.88 25.50 24.30 30.80 32.96
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16 Instalco Interim report January – September 2026 www.instalco.se Reconciliation of key figures not defined in accordance with IFRS The Company presents certain financial measures in the interim report, which are not defined under IFRS. The Company believes that these measures provide useful supplemental information to investors and the company's management, since they allow for the evaluation relevant trends. Instalco’s definitions of these measures may differ from other companies using the same terms. These financial measures should therefore be viewed as a supplement, rather than as a replacement for measures defined under IFRS. Presented below are definitions of measures that are not defined under IFRS and which are not mentioned elsewhere in the interim report. Reconciliation of these measures is provided in the table, below. For definitions of key figures, see instalco.se. Earnings measures and margin measures Capital structure AMOUNTS IN SEK M Q3 2026 Q2 2026 Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 (A) Net sales 3,526 3,874 3,438 3,766 3,028 3,512 3,293 3,610 (B) EBITDA 366 382 303 380 282 325 222 302 Depriciation/amortisation and impairment of property, plant and equipment and intangible assets -111 -107 -103 -108 -102 -101 -99 -107 (C) EBITA 254 274 201 272 180 225 123 195 Depriciation/amortisation and impairment of intangible assets -48 -32 -30 -32 -33 -33 -34 -69 (D) Operating profit/loss (EBIT) 206 242 170 240 148 192 88 126 (B/A) EBITDA margin, % 10.4 9.9 8.8 10.1 9.3 9.3 6.7 8.4 (C/A) EBITA margin, % 7.2 7.1 5.8 7.2 6.0 6.4 3.7 5.4 (D/A) Operating profit/loss, (EBIT), % 5.8 6.2 5.0 6.4 4.9 5.5 2.7 3.5 AMOUNTS IN SEK M Q3 2026 Q2 2026 Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Calculation of working capital and working capital in relation to net sales Inventories 247 184 190 188 199 207 208 209 Accounts receivable 2,078 2,009 1,759 1,839 1,802 1,828 1,715 1,943 Contract assets 1,004 808 814 551 777 751 796 648 Prepaid expenses and accrued income 166 159 144 241 233 230 226 204 Other current assets 181 118 129 164 158 156 139 157 Trade payables -1,303 -1,165 -1,187 -989 -1,128 -1,070 -1,085 -905 Contract liabilities -547 -598 -545 -521 -592 -550 -545 -528 Other current liabilities -412 -260 -233 -386 -223 -366 -292 -606 Accrued expenses and deferred income, including provisions -832 -935 -920 -867 -768 -858 -835 -808 (A) Working capital 582 321 150 220 459 328 325 314 (B) Net sales (12-months rolling) 14,604 14,106 13,744 13,598 13,442 13,557 13,700 13,690 (A/B) Working capital as a percentage of net sales, % 4.0 2.3 1.1 1.6 3.4 2.4 2.4 2.3
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17 Instalco Interim report January – September 2026 www.instalco.se AMOUNTS IN SEK M Q3 2026 Q2 2026 Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Calculation of interest-bearing net debt and gearing ratio Non-current, interest-bearing financial liabilities 4,516 3,263 3,162 3,510 3,561 3,722 3,292 3,396 Current, interest-bearing financial liabilities 412 303 282 281 275 272 274 269 Cash and cash equivalents -204 -4 -102 -348 -67 -421 -87 -208 (C) Interest-bearing net debt 4,724 3,562 3,343 3,444 3,769 3,573 3,479 3,458 (D) Equity 3,672 3,487 3,394 3,228 3,169 3,219 3,283 3,209 (C/D) Gearing ratio, % 128.6 102.2 98.5 106.7 118.9 111.0 106.0 107.8 (E) EBITDA (12-months rolling) 1,431 1,347 1,290 1,209 1,131 1,146 1,180 1,278 (C/E) Interest-bearing net debt in relation to EBITDA (12-months rolling) 3.3x 2.6x 2.6x 2.8x 3.3x 3.1x 2.9x 2.7x Calculation of operating cash flow and cash conversion (12-months rolling) (F) EBITDA 1,431 1,347 1,290 1,209 1,131 1,146 1,180 1,278 Net investments in property, plant and equipment and intangible assets -151 -128 -117 -94 -80 -114 -118 -100 Changes in working capital -226 -4 117 192 219 193 72 -37 (G) Operation cash flow (12-months rolling) 1,054 1,215 1,290 1,307 1,271 1,225 1,134 1,142 (G/F) Cash conversion % (12-months rolling) 74 90 100 108 112 107 96 89 (H) Earnings for the period (12-months rolling) 564 438 414 376 279 293 302 364 (H/D) Return on equity, % 16.4 13.2 12.7 11.7 8.7 9.2 9.5 11.3 (I) EBIT 206 242 170 240 148 192 88 126 (J) Financial income 105 -6 9 21 10 13 21 7 (K) Total assets 12,254 10,581 10,233 10,267 10,241 10,648 10,193 10,310 (L) Interest-free liabilities 3,473 3,293 3,202 3,078 3,072 3,232 3,152 3,262 (I+J)/(K-L) Return on capital employed, % 12.7 11.1 10.5 9.6 7.9 7.9 8.6 10.1
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18 Instalco Interim report January – September 2026 www.instalco.se Notes Note 1. Accounting policies The interim report has been prepared in accordance with IFRS as adopted by the EU, applying IAS 34 Interim Financial Reporting. Disclosures required under IAS 34.16A are presented not only in the financial statements and accompanying explanatory notes, but also in other sections of the interim report. The interim report for the Parent Company has been prepared in accordance with the Swedish Annual Accounts Act and the Swedish Securities Market Act, which is consistent with the provisions of RFR 2 Accounting for Legal Entities. The same accounting policies and methods of calculation as in the most recent Annual Report have been applied in preparing the interim report. New and amended IFRS Accounting Standards and IFRIC Interpretations effective from the 2026 financial year have not had any material impact on the Group’s financial statements. During the quarter, the Group established hedging relationships to hedge net investments in foreign operations (Fabri AG), using foreign currency loans as hedging instruments. Hedge accounting is applied in accordance with IFRS 9. Exchange differences on the hedging instruments corresponding to the effective portion of the hedge are recognised in other comprehensive income and accumulated in the translation reserve within equity. The ineffective portion of the hedge is recognised in profit or loss for the period. IFRS 18 is effective for financial years beginning on or after 1 January 2027 and will be applied by Instalco from that date. The standard will be applied retrospectively to all comparative periods. As IFRS 18 only affects presentation and disclosures, and not the measurement of items in the financial statements, the transition is not expected to affect retained earnings. The main effects relate to the presentation of the income statement, where certain items will be classified differently and new subtotals, such as operating profit, will be introduced. Comparative figures will be restated, and a reconciliation between the previous presentation under IAS 1 and the new presentation under IFRS 18 will be provided. The final analysis of the transition effects and disclosure requirements, as well as the assessment of Management Performance Measures (MPMs), is still ongoing. Basis for consolidation Fabri AG is included in the consolidated financial statements as of 1 August 2026 and is reported with a one-month lag. This means that it is the month of August of Fabri AG’s earnings that is included in the Group’s results for the third quarter of 2026 within the Finland & Germany segment. The Group continuously evaluates the application of this reporting lag. For further information on policies for consolidation, please refer to page 109 of the 2025 Annual Report. Note 2. Seasonal variations The company’s revenue, profitability and cash flow are impacted by seasonal variations and holidays, which limits comparability of the various interim periods. Instalco recognises revenue based on the percentage of completion of its projects, meaning that fewer working days result in lower revenue from ongoing projects. Revenue and profitability are affected primarily in the first and third quarters due to holiday periods and lower levels of activity. Companies serving industrial clients traditionally experience lower levels of activity during the first quarter. Seasonal patterns vary somewhat across the Group's geographical markets, with Finland and Germany generally experiencing a more gradual increase in activity over the course of the year. Fabri is reported with a one-month lag, meaning that its December earnings are included in the Group's first quarter. The highest earnings tend to come in the fourth quarter, when many projects are completed.
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19 Instalco Interim report January – September 2026 www.instalco.se Note 3. Segment reporting and distribution of revenue The Group's operations are divided into segments based on the geographic location of companies. Reportable segments as of 1 January 2026 were Sweden, Norway and Finland. Following the consolidation of Fabri AG, reportable segments are as follows: Sweden, Norway, Finland & Germany. The portion of operations that does not yet meet the definition of an operating segment is reported in the line item, Other. Distribution of revenue Segment reporting AMOUNTS IN SEK M Sweden Norway Finland & Germany Total Share Sweden Norway Finland & Germany Total Share Service 923 159 198 1,281 36% 734 106 265 1,106 37% Contract 1,514 393 337 2,245 64% 1,341 411 170 1,922 63% Total 2,437 553 536 3,526 100% 2,075 518 435 3,028 100% AMOUNTS IN SEK M Sweden Norway Finland & Germany Total Share Sweden Norway Finland & Germany Total Share Service 2,686 469 620 3,775 35% 2,532 370 652 3,554 36% Contract 5,025 1,260 778 7,063 65% 4,494 1,259 525 6,278 64% Total 7,711 1,729 1,398 10,838 100% 7,026 1,628 1,178 9,832 100% Jul-Sep 2026 Jul-Sep 2025 Jan-Sep 2026 Jan-Sep 2025 AMOUNTS IN SEK M Sweden Norway Finland & Germany Other Total Sweden Norway Finland & Germany Other Total Net sales 2,437 553 536 - 3,526 2,075 518 435 - 3,028 Share of the total, % 69% 16% 15% - 100% 69% 17% 14% - 100% EBITA 179 20 56 0 254 105 28 48 -0 180 EBITA margin, % 7.4% 3.5% 10.4% - 7.2% 5.0% 5.4% 11.0% - 6.0% Depriciation/amortisation and impairment of intangible assets -17 -17 -15 - -48 -15 -15 -3 - -33 Net financial items -5 -1 -3 36 28 -4 -1 -1 -49 -55 Profit/loss before tax 157 2 38 37 234 85 13 44 -49 92 Jul-Sep 2026 Jul-Sep 2025 AMOUNTS IN SEK M Sweden Norway Finland & Germany Group-wide Total Sweden Norway Finland & Germany Group-wide Total Net sales 7,711 1,729 1,398 - 10,838 7,026 1,628 1,178 - 9,832 Share of the total, % 71% 16% 13% - 100% 71% 17% 12% - 100% EBITA 499 87 142 0 730 372 83 85 -11 528 EBITA margin, % 6.5% 5.1% 10.2% - 6.7% 5.3% 5.1% 7.2% - 5.4% Depriciation/amortisation and impairment of intangible assets -46 -45 -20 - -111 -47 -44 -9 - -100 Net financial items -14 -4 -4 -75 -97 -17 -3 -2 -99 -122 Profit/loss before tax 440 38 119 -75 522 307 36 73 -110 306 Jan-Sep 2026 Jan-Sep 2025
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20 Instalco Interim report January – September 2026 www.instalco.se Note 4. Impact of acquisitions Acquisitions had the following impact on the Group’s assets and liabilities. Instalco regards the calculations as until final figures pertaining to the acquired companies have been received. AMOUNTS IN SEK M Fair value, Group Of which Fabri AG Intangible assets 192 147 Deferred tax asset 58 58 Other non-current assets 325 223 Other current assets 298 253 Cash and cash equivalents 178 169 Deferred tax asset -36 -14 Other liabilities -1,020 -947 Total identifiable assets and liabilities (net) -3 -111 Non-controlling interests 14 54 Goodwill 829 801 Consideration paid Cash and cash equivalents 449 394 Contingent consideration including settlement via issue in kind 28 - Treasury shares 12 - Total transferred consideration 489 394 Fair value of shares in associated companies 350 350 Impact on cash and cash equivalents Cash consideration paid 449 394 Cash and cash equivalents of the acquired units -177 -168 Total impact on cash and cash equivalents 272 226 Settled contingent consideration attributable to acquisitions in the current year and prior years 12 - Exchange rate difference -1 -1 Total impact on cash and cash equivalents 283 225 Impact after the acquisition date included in the Instalco Group's net sales and operating profit/loss Net sales 206 Operating profit (EBIT) 25 Impact on net sales and operation profit/loss until the acquisition date if the acquisitions had been completed on 1 January 2026 Net sales 957 Operating profit (EBIT) 133
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21 Instalco Interim report January – September 2026 www.instalco.se In accordance with IFRS, contingent consideration has been measured at fair value via profit or loss. It is classified in Level 3 of the fair value hierarchy and reported under Non-current liabilities and Other current liabilities in the balance sheet. The fair value of other financial assets and liabilities does not differ significantly from the carrying amounts. At the end of the period, the Group’s total estimated contingent consideration amounted to SEK 190 million. The maximum, non-discounted amount that could be paid to prior owners is SEK 393 million. Revaluation of contingent consideration had a net impact on the period of SEK 7 (10) million, which is reported in Other operating expenses and Other operating income in the income statement. Changes in reported contingent consideration. AMOUNTS IN SEK M Jan-Sep 2026 Jan-Dec 2025 Opening carrying amounts 33 180 Revaluation of contingent consideration -7 -15 Paid contingent consideration -13 -131 Added through acquistions made during the period 177 2 Exchange rate difference -1 -3 Closing carrying amounts 190 33
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22 Instalco Interim report January – September 2026 www.instalco.se Note 5. Shares in associated companies Associated companies refer to entities over which the Group exercises significant influence, but which are neither subsidiaries nor part of a joint arrangement. Shares in associated companies are accounted for using the equity method and are initially recognised at cost. Acquired assets and liabilities are measured in accordance with the same principles applied to Group companies. The carrying amount of associated companies includes any recognised goodwill and consolidation adjustments. The Instalco Group’s share of profit or loss of associates is recognised under Other operating income. The share of profit or loss is calculated based on Instalco’s ownership share in the associated company and the impact during 2026 has amounted to SEK 5.2 million. During the quarter, the Group increased its ownership in Fabri AG from 24 to 51 percent through a step acquisition, thereby obtaining control of the company. The holding has consequently been reclassified as a subsidiary and is consolidated as of 1 August 2026. In connection with the acquisition, the previously held interest in Fabri AG was remeasured at fair value, resulting in a remeasurement gain of SEK 102 million recognised in net financial items.
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23 Instalco Interim report January – September 2026 www.instalco.se Share Information At the end of the period, the number of shares and votes in Instalco AB amounted to 268,754,752. The ten largest known shareholders (grouped) of Instalco AB as of 30 September 2026. Source: Monitor by Modular Finance AB. Compiled and processed data from Euroclear, Morningstar and FI. Outstanding share-related incentive programmes Instalco has three outstanding warrants scheme corresponding to a total of 3,244,311 shares that are directed at the expanded Group management team, CEOs of subsidiaries and other key individuals of the Group. The warrants have been transferred on market terms at a price that was established based on an estimated market value using the Black & Scholes valuation model calculated by an independent valuation institute. Conditions for subscription price per share in the programmes correspond to 115 percent of the volume-weighted average price during the period of five trading days after each AGM. See the table, Quarterly data, for period-end share price. Warrants that had not previously been allocated under the programmes were cancelled during the quarter. Instalco's ten largest shareholders, 2026-09-30 Number of shares Share of the votes and capital 1 Per Sjöstrand 22,999,835 8.6% 2 AMF Pension & Fonder 17,592,889 6.6% 3 Capital Group 17,186,603 6.4% 4 Wipunen varainhallinta OY 13,200,000 4.9% 5 Torpanmaa Oy 13,200,000 4.9% 6 Handelsbanken Fonder 12,536,845 4.7% 7 ODIN 10,545,515 3.9% 8 Vanguard 9,014,140 3.4% 9 Fjärde AP-fonden 8,650,000 3.2% 10 BlackRock 6,324,828 2.4% Total, ten largest shareholders 131,250,655 48.8% Other 137,504,097 51.2% Total 268,754,752 100.0% Outstanding programme Number of options Percentage of the total number of shares Price per option Redemption rate per option Redemption period 2024/2027 1,280,500 0.5% SEK 7.74 SEK 44.32 24 May 2027 - 18 June 2027 2025/2028 1,181,500 0.4% SEK 2.55 SEK 31.40 22 May 2028 - 16 June 2028 2026/2029 782,311 0.3% SEK 4.52 SEK 44.37 21 May 2029 - 15 June 2029
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24 Instalco Interim report January – September 2026 www.instalco.se Signatures Future reporting dates Year-end report 2026 11 February 2027 Interim report January – March 2027 28 April 2027 AGM 2026 4 May 2027 Interim report January – June 2027 16 July 2027 Interim report January – September 2027 27 October 2027 Assurance The Board of Directors and CEO ensure that the year-end report provides a fair view of the Group's operations, position and earnings, and describes significant risks and uncertainties faced by company and the companies belonging to the Group. Stockholm, 23 October 2026 Instalco AB (publ) Johnny Alvarsson Chairman Camilla Öberg Director Carina Qvarngård Director Ulf Wretskog Director Per Leopoldsson Director Carina Edblad Director Per Sjöstrand CEO and Director This report has been reviewed by the company’s auditors. Presentation of the report The report will be presented in a telephone conference/audiocast today, 23 October at 09:30 CET via https://instalco.events.inderes.com/q3-report-2026 To participate by phone, register via https://events.inderes.com/instalco/q3-report-2026/dial-in Note This information is information that Instalco is required to disclose under the EU Market Abuse Regulation. The information was made public by the contact person listed below, on 23 October 2026 at 07:30 CET. Additional information Per Sjöstrand, CEO Christina Kassberg, CFO, christina.kassberg@instalco.se Mathilda Eriksson, Head of IR, mathilda.eriksson@instalco.se +46 (0)70-972 34 29
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25 Instalco Interim report January – September 2026 www.instalco.se Auditor’s review report THIS IS A TRANSLATION FROM THE SWEDISH ORIGINAL Auditor's report on review of interim financial information in summary (interim report) prepared in accordance with IAS 34 and Chapter 9 of the Swedish Annual Accounts Act (1995:1554) Introduction We have reviewed the condensed consolidated interim financial information in summary (interim report) of Instalco AB (publ) as of 30 September 2026 and the nine-month period then ended. The Board of Directors and the CEO are responsible for the preparation and presentation of this interim report in accordance with IAS 34 and the Swedish Annual Accounts Act. Our responsibility is to express a conclusion on this interim report based on our review. Scope of Review We conducted our review in accordance with International Standard on Review Engagements 2410, Review of Interim Financial Information Performed by the Independent Auditor of the Entity. A review of interim financial information consists of making inquiries, primarily of persons responsible for financial and accounting matters, and applying analytical and other review procedures. A review has a different focus and is substantially less in scope than an audit conducted in accordance with International Standards on Auditing and other generally accepted auditing standards. The procedures performed in a review do not enable us to obtain assurance that would make us aware of all significant matters that might be identified in an audit. Therefore, the conclusion expressed based on a review does not give the same level of assurance as a conclusion expressed based on an audit. Conclusion Based on our review, nothing has come to our attention that causes us to believe that the condensed consolidated interim report is not, in all material respects, prepared in accordance with IAS 34 and the Swedish Annual Accounts Act for the Group and the Swedish Annual Accounts Act for the Parent company. Stockholm, October 23, 2026 Grant Thornton Sweden AB Ida Sparrfeldt Authorized Public Accountant
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26 Instalco Interim report January – September 2026 www.instalco.se Instalco in brief Instalco’s operations are diversified across several end markets, customer categories and contract types, with a primary focus on small and medium-sized projects. The breadth of diversification enhances stability, lowers dependence on single transactions, and supports more resilient earnings across business cycles. Net sales by discipline1 Net sales by segment1 1 Cumulative distribution of net sales for the reporting period Sales by end market2 Sales by customer category2 Sales by contract type2 Sales by project type2 2 The figures are for the previous full year Heating & Plumbing 27% Electrical 32% Ventilation 13% Industry 22% Tech & Consulting 6% Sweden 69% Norway 16% Finland & Germany 15% Industrial properties 21% Schools & hospitals 16% Office 12% Logistics/warehousing 2% Commercial properties 14% Residential renovation 8% Residential new construction 7% Energy production 4% Data centres 1% Other 15% Construction companies 48% Public sector 20% Property companies 9% Industrial companies 8% Other 15% Fixed-price projects 43% Cost-plus and other forms of remuneration 57% New production 30% Renovation 33% Service 37%
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27 Instalco Interim report January – September 2026 www.instalco.se Instalco has a decentralised structure, where operations are conducted in each unit, in close cooperation with customers and with the support of a very streamlined central organisation. The Instalco model is designed to benefit from the advantages of both strong local ties and joint functions. Vision We enable our companies, employees and customers to grow by collaborating on installations for the transition to a green society for the next generation. We are the most competent and efficient partner for our customers. Instalco spirit Through courage, entrepreneurship, best practice and mature leadership, we harness the power in each other. We are down-to-earth, show great commitment, ensure an open atmosphere and create a sense of well-being. When everyone truly wants to develop and cooperate, we are the best in the industry. Then, we succeed together! Business concept Instalco offers complete technical solutions in electrical, heating & plumbing, ventilation, industry and Tech & Consulting for the Northern European market. We work closely with customers, offering all the advantages of a local company, along with efficient collaboration and mature leadership. Instalco AB (publ) Sveavägen 56C 111 34 Stockholm info@instalco.se ⚫ Customers and sales ⚫ Production ⚫ Employees ⚫ Profit responsibility ⚫ Multidisciplinary projects and cross-selling ⚫ Spreading best practice ⚫ Developing talent ⚫ Resource sharing ⚫ Sustainability ⚫ Purchasing ⚫ Business development and strategy ⚫ Acquisitions ⚫ Accounting & Finance ⚫ Communications and IR Local responsibility Joint responsibility Cooperation Local units Central organi sation