6706 Q1 2027 Earnings Presentation

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Supplementary Briefing Materials on Annual Financial Results for the First Quarter Fiscal Year Ending March 31 , 2027 August 7 , 2026 DKK Co. , Ltd. Securities code : 6706 Tokyo Stock Exchange , Prime © 2026 DKK Co. , Ltd. All Rights Reserved .

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© 2026 DKK Co., Ltd. All Rights Reserved. Overview of Financial Results FY2027/3 Q1 1 Net sales 7,483 Million yen Year on year +1,500 Million yen (+25.1％) Operating income - 4 Million yen Year on year Q1 Earnings Comment +428 Million yen (ー) Earnings Forecast FY2027/3 Net sales Operating income 36,500 Million yen 1,650 Million yen ◼ Drivers of net sales growth • Net sales increased year-on-year, driven by steady demand across the Telecommunication segment and a recovery in capital investment demand from the automotive-related industry in the Radio Frequency segment. ◼ Drivers of profit growth • +428 million yen year-on-year due to increased revenue effects in the Telecommunication and the Radio Frequency segments and measures to improve earnings • The impact of rising raw material costs and logistics costs continues from the previous fiscal year. ◼ Efforts to improve profitability • Continuing to focus on profitability-oriented order acquisition activities and operational efficiency improvements through the promotion of generative AI and DX. ◼ Full-year outlook • Progressing steadily against forecasts at the beginning of the fiscal year, with no changes. • The Telecommunication segment expects increased revenue as Mobile Communications and Broadcasting segments remain strong. • The Radio Frequency segment expects increased revenue and profit due to recovery in capital investment demand from the automotive-related industry.

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© 2026 DKK Co., Ltd. All Rights Reserved. 1-1. Q1 Consolidated Results Highlights 4 • Net sales increased 25.1% year-on-year. All income categories also achieved year-on-year increases. • Net income increased due to the recording of extraordinary gains from the handover of fixed assets sold in the fiscal year ended March 2024. （Millions of yen） FY2026/3 Q1 results FY2027/3 Q1 results Increase/ decrease YoY change Net sales 5,983 7,483 1,500 25.1% Gross profit 1,144 1,485 340 29.8% Operating income -433 -4 428 - Ordinary income -411 230 641 - Net income attributable to shareholders of parent company -212 1,307 1,519 -

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© 2026 DKK Co., Ltd. All Rights Reserved. 1-2. Net Sales and Operating Income 5 • The Telecommunication segment achieved increased revenue and profit as demand for 5G antennas and wireless equipment in mobile communications remained strong. • The Radio Frequency segment achieved increased revenue and profit due to the recovery in capital investment demand from some customers in the automotive industry for induction heating equipment. （Millions of yen） FY2026/3 Q1 results FY2027/3 Q1 results Increase/ decrease YoY change Net sales 5,983 7,483 1,500 25.1% Telecommunication 3,691 4,835 1,143 31.0% Radio Frequency 2,261 2,619 357 15.8% Operating income -433 -4 428 - Operating margin ratio -7.2% -0.1% - - Telecommunication 67 322 255 378.4% Radio Frequency 240 353 112 46.6% *The operating incomes for Telecommunication and Radio Frequency are provided by segment.

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© 2026 DKK Co., Ltd. All Rights Reserved. 1-3. Results by Segment 6 Amount Composition Amount Composition Increase/ decrease Increase/ decrease rate Net sales 5,983 100.0% 7,483 100.0% 1,500 25.1% Telecommunication 3,691 61.7% 4,835 64.6% 1,143 31.0% Mobile Communications 1,150 19.2% 1,450 19.4% 300 26.1% Fixed Wireless 287 4.8% 448 6.0% 160 55.8% Defense 611 10.2% 964 12.9% 353 57.8% Broadcasting 449 7.5% 671 9.0% 222 49.5% Solutions 68 1.1% 35 0.5% -32 -48.2% Others 1,124 18.8% 1,264 16.9% 140 12.5% Radio Frequency 2,261 37.8% 2,619 35.0% 357 15.8% Induction Heating Equipment 1,494 25.0% 1,799 24.0% 304 20.4% Contract Heat Treating Service 766 12.8% 814 10.9% 47 6.2% New Radio Frequency Areas 0 0.0% 6 0.1% 5 - （Millions of yen） FY2026/3　Q1 results FY2027/3 Q1 results

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© 2026 DKK Co., Ltd. All Rights Reserved. 5,983 300 353 222 -32 140 304 47 5 160 7,483 1-4. Factors of YoY Change in Net Sales 7 Telecommunication Radio Frequency Mobile Communications FY2026/3 Q1 results (Millions of yen) Mobile Communications (+300 Million yen) Automotive production activities remained flat. Steadily securing demand both domestically and internationally. FY2027/3 Q1 results Fixed Wireless Defense Broadcasting Solutions Others Induction Heating Equipment Contract Heat Treating Service New Radio Frequency Areas Demand for 5G antennas and wireless equipment continues. Tower and maintenance demand has also been steadily secured. Defense (+353 Million yen) Capital investment demand has recovered among some customers. Demand from industries other than automotive was also secured, resulting in increased revenue year-on-year. Induction Heating Equipment (+304 Million yen) Contract Heat Treating Service (+47 Million yen) While demand for defense equipment remained strong, delivery schedule adjustments occurred due to the situation in the Middle East. Recent trends show improvement. Broadcasting (+222 Million yen) In addition to maintenance demand for digital broadcasting equipment, renewal demand has also emerged.

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© 2026 DKK Co., Ltd. All Rights Reserved. 1-5. Quarterly Sales Trends 8 0 2,000 4,000 6,000 8,000 10,000 12,000 Q1 Q2 Q3 Q4 Q1 Mobile Communications Fixed Wireless Defense Broadcasting Solutions Others Induction Heating Equipment Contract Heat Treating Service New Radio Frequency Areas (Millions of yen) FY2026/3 FY2027/3 Net sales 7,48310,3675,983 8,931 10,164 (Millions of yen) • First-quarter net sales exceeded the level recorded in the same period of the previous fiscal year. • The Telecommunication segment saw generally increased revenue, with delivery-related projects progressing smoothly across all segments. • The Radio Frequency segment saw recovery in capital investment demand that had been suppressed in the same period of the previous fiscal year, contributing to increased sales.

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© 2026 DKK Co., Ltd. All Rights Reserved. -433 612 -244 -27 70 17 -4 -500 -400 -300 -200 -100 0 100 200 300 1-6. Factors of YoY Change in Operating Income 9 Operating income (million yen) ✓ Effect of increased revenue in both the Telecommunication and Radio Frequency segments ✓ Restructuring costs for realizing growth strategy and advancing management sophistication Decrease in SG&A Impact of increased sales Restructuring Costs ✓ Increase in labor expenses etc. ✓ Soaring raw material prices ✓ Recording of sales with high variable cost ratios Profit increase by 428 million yen ✓ Although labor expenses increased, fixed cost reduction and operational efficiency improvements are being promoted FY2027/3 Q1 results FY2026/3 Q1 results • Operating income increased due to the effect of increased sales in the Telecommunication and Radio Frequency segments. • The impact of increased sales and decrease in SG&A absorbed the decline in marginal profitratio, resulting in a profit increase of 428 million yen year-on-year. Decline in the marginal profit ratio Increase in indirect costs

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© 2026 DKK Co., Ltd. All Rights Reserved. Increase/ decrease Increase/ decrease rate Net sales 32,582 35,446 36,500 1,053 3.0% Telecommunication 22,067 25,387 25,600 212 0.8% Radio Frequency 10,411 9,952 10,800 847 8.5% Operating income 935 1,219 1,650 430 35.3% Operating margin ratio 2.9% 3.4% 4.5% - - Telecommunication 1,917 2,377 2,800 423 17.8% Operating margin ratio 8.7% 9.4% 10.9% - - Radio Frequency 1,743 1,596 1,700 104 6.5% Operating margin ratio 16.7% 16.0% 15.7% - - Ordinary income 1,024 1,216 1,650 433 35.6% Ordinary income margin 3.1% 3.4% 4.5% - - Net income attributable to shareholders of parent company 777 1,903 2,300 396 20.8% ROE（％） 2.1% 5.2% 6.1% - - *The operating incomes for Telecommunication and Radio Frequency are provided by segment. *Sales from the equipment leasing and electric power sales businesses is omitted. FY2027/3 Full-year forecasts（Millions of yen） YoY changeFY2025/3 Full-year results FY2026/3 Full-year results 2-1. Forecasts for Consolidated Results 11 • Full-year forecast disclosed at the beginning of the fiscal year remains unchanged. • Revenue and profit increases are expected due to strong performance in the Telecommunication segment and recovery in capital investment demand in the Radio Frequency segment.

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© 2026 DKK Co., Ltd. All Rights Reserved. 2-2. Forecasts by Segment 12 Increase/ decrease Increase/ decrease rate Net sales 32,582 35,446 36,500 1,053 3.0% Telecommunication 22,067 25,387 25,600 212 0.8% Mobile Communications 5,971 7,734 8,200 465 6.0% Fixed Wireless 4,358 4,744 4,000 -744 -15.7% Defense 2,818 3,703 3,800 96 2.6% Broadcasting 3,270 3,589 4,000 410 11.4% Solutions 482 357 600 242 68.0% Others 5,165 5,257 5,000 -257 -4.9% Radio Frequency 10,411 9,952 10,800 847 8.5% Induction Heating Equipment 7,336 6,800 7,700 899 13.2% Contract Heat Treating Service 3,065 3,146 3,000 -146 -4.7% New Radio Frequency Areas 9 6 100 93 - （Millions of yen） FY2025/3 Full-year results FY2027/3 Full-year forecasts YoY changeFY2026/3 Full-year results

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© 2026 DKK Co., Ltd. All Rights Reserved. 2-3. Order Status 13 • The Telecommunication segment has been steadily accumulating orders, and the order backlog remains strong. • The Radio Frequency segment saw an increase in order backlog for induction heating equipment due to recovery in capital investment demand from some customers since the second half of the previous fiscal year. FY2026/3 (1) (2) (3) (4)＝(1)+(2)-(3) (4)-(1) Tele- communication 17,257 8,458 4,835 20,880 3,623 6,154 17,015 Radio Frequency 3,926 2,930 2,619 4,237 310 2,370 3,206 Total 21,183 11,388 7,483 25,117 3,934 8,525 20,222 (Ref.) FY2026/3 Q1Order backlog Net sales Orders received Order backlog Increase/ decrease Order backlog Orders received *Total net sales for FY2027/3 Q1 include 28 million yen in net sales from the equipment leasing and electric power sales businesses. （Millions of yen ） FY2027/3 Q1

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© 2026 DKK Co., Ltd. All Rights Reserved. 2-4. Policy on Shareholder Returns 14 ＜Dividend per share trends＞ (yen) 30 30 30 40 5045 60 30 30 50 60 55 FY2021/3 FY2022/3 FY2023/3 FY2024/3 FY2025/3 FY2026/3 FY2027/3 (Forecasts) Interim Year-end 100 +5 yen 45 60 60 60 80 105 Stable returns to our shareholders will continue ⚫ Dividend Policy • The target consolidated payout ratio is set at 40%, with a minimum DOE of approximately 2.5%. The minimum DOE (consolidated dividend on equity) was raised to 2.5% from 2.0% in February 2026. • The annual dividend forecast for FY2027/3 is105 yen, an increase of 5 yen 14 ⚫ Under DKK-Plan2028, we formulated a capital strategy focused on business investments for growth and shareholder returns. ⚫ Regarding share repurchases, we will continue to implement them flexibly and opportunistically.

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© 2026 DKK Co., Ltd. All Rights Reserved. 2-5. Introduction of a Shareholder Benefits Program 15 The program has been introduced to make our shares more attractive as an investment and encourage more shareholders to hold them over the long term. Number of Shares Held Continuous Holding Period Less than 3 years 3 years or more* 100-299 shares Equivalent to 2,000 yen Equivalent to 3,000 yen 300-499 shares Equivalent to 4,000 yen Equivalent to 5,000 yen 500 shares or more Equivalent to 6,000 yen Equivalent to 7,000 yen ⚫ Details of the Shareholder Benefits Eligible shareholders may select and receive an item of their choice from our original benefits catalog. The benefit catalog is expected to feature local specialties from regions connected to our business locations, as well as other items. * “3 years or more” means that the shareholder is registered or recorded under the same shareholder number as holding 100 shares or more on four or more consecutive March 31 record dates. ◼ Purpose ◼ Eligible Shareholders Enhancing the attractiveness of our shares by increasing the combined yield from dividends and shareholder benefits. Shareholders holding 100 shares (one unit) or more who are registered or recorded in the Company’s shareholder registry as of March 31 each year The program will commence for eligible shareholders as of March 31, 2027. ◼ Start Date

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© 2026 DKK Co., Ltd. All Rights Reserved. New Products and Services ◼ 2025/11/21 AI人流・交通分析システムの可搬型サービス提供を開始 ◼ 2025/12/3 「MWE2025」出展（MWE：Microwave Workshops and Exhibition） ◼ 2025/12/25 WPT実証評価試験を実施のご報告 ◼ 2025/12/26 NTTドコモ向け 700MHz帯5G無線装置の納入を開始 ◼ 2026/1/5 「電波タイムズ」に総務省委託研究（空間伝送型WPT）に関する記事が掲載 ◼ 2025/12/12 標準電波JJYがIEEEマイルストーンに認定 ◼ 2026/4/1 An Article About our Technology was Featured in the April 2026 Issue of the Monthly Magazine “Machinery & Equipment For Food Industry.” (Introducing the Features and Potential of Powder Sterilization Technology Using Ultra-High-Temperature Superheated Steam) ◼ 2026/4/1 Implemented an “AI-powered Phone Support” for Nasu Town, Tochigi Prefecture ◼ 2026/4/27 Implemented the “AI pedestrian Flow and Traffic Analysis System” for Fukushima City ◼ 2026/4/28 Notice of Our Exhibition at Government & Public Sector Week Japan 2026 ◼ 2026/5/12 Expanded the Product Lineup for the “RapidDeodorizer-X ,” a spot-type deodorization equipment ◼ 2026/5/12 Developed a Compact, Boiler-less, Recirculating Superheated Steam system ◼ 2026/5/13 Launched “DK-TBX-15,” a Gimbal-Mounted Thermal/Surveillance Camera ◼ 2026/5/19 Developed a Vertical Heat-Treatment Equipment that Enables a Significant Reduction in Machine Height and Operating Time ◼ 2026/5/20 Notice of Our Exhibition at FOOMA JAPAN 2026 ◼ 2026/5/29 Launch of the AI-Powered “Road Patrol Solution” for Road Maintenance Support ◼ 2026/6/3 An Article About our Technology was Featured in the June 2026 Issue of the Monthly Magazine “Machinery & Equipment For Food Industry.” (Introducing an Ultra-Fast Deodorization System Combining High-Frequency Induction Heating and Catalytic Decomposition, and Odor Control Measures in Food Manufacturing Facilities) ◼ 2026/6/3 Report on the Exhibition and Presentation of Our Technologies at Wireless Japan × Wireless Technology Park (WTP) 2026 ◼ 2026/6/25 Receipt of a Certificate of Appreciation for Restoration Work on the Steel Tower at the NTT Aomori Hachinohe Building ◼ 2026/6/29 Launch of an Inter-Platform Passenger Flow Survey at JR Kitakami Station to Improve Transfer Convenience 17 Other Updates Disclosure Information (News Releases)

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© 2026 DKK Co., Ltd. All Rights Reserved. 18 Notes on Forecasts Figures included in this document that are related to descriptions, including plans and policies and not past facts, are forecasts regarding future earnings. They are all calculated based on management assumptions and views based on information grasped by the company at the time of writing. Therefore, these forecasts include risks and uncertain factors, and actual results may differ from them due to a variety of factors. Such potential risks and uncertain factors include changes in economic situations and product demand levels in major markets, fluctuations in the exchange rate, changes in regulations in Japan and overseas, and accounting standards and practices. This document has been translated from the Japanese original for reference purposes only. In the event of any discrepancy between this translated document and the Japanese original, the original shall prevail. Business Planning Dept. TEL ＋81ｰ3-3520ｰ8304 E-mail ir@denkikogyo.co.jp Inquiries on Investor Relations

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