AOF Q1 2025 Earnings Presentation

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© ATOSS Software SE 20252 © ATOSS Software SE 2025 This presentation contains forward-looking statements based on the beliefs of ATOSS Software SE. Such statements reflect current views of ATOSS Software SE with respect to future events and results and are subject to risks and uncertainties. Actual results may vary materially from those projected here, due to factors including changes in general economic and business conditions, the introduction of competing products, lack of market acceptance of new products, services or technologies and changes in business strategy. ATOSS Software SE does not intend or assume any obligation to update these forward-looking statements. ATOSS Software SE 2025 Disclaimer

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© ATOSS Software SE 20254 20 01.01.2001 01.01.2015 40 01.01.2016 01.01.2017 60 01.01.2018 01.01.2019 80 01.01.2020 01.01.2021 100 01.01.2022 01.01.2024 120 01.01.202301.01.2002 140 01.01.2025 0 March 21, 2000: IPO 2006: Success story begins: 19 record years in a row 2003: Admission to the “Prime Standard of German stock exchange” 2008-2010: Global economic crisis 2020-2022: Outbreak COVID-19 pandemic June 19, 2020: Share split July 1, 2021: Admission to the SDAX listing May 10, 2023: Admission to the TecDAX listing June 30, 2023: General Atlantic acquires 20% June 10, 2024: SE-Transformation June 25, 2024: Share split August 21, 2024: Share price record 143.20 EUR ATOSS – 25 years at German Stock Exchange (1/2) Celebrating ATOSS’ anniversary as a listed company

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© ATOSS Software SE 20255 ATOSS – 25 years at German Stock Exchange (2/2) ATOSS’ remarkable journey on the German Stock Exchange Over the last 25 years, ATOSS has demonstrated remarkable resilience, successfully navigating challenges like the dotcom bubble, global economic crisis, and COVID pandemic Since the IPO, ATOSS’ share price increased by 1,318%, outperforming DAX (195%), SDAX (383%) and TecDAX1 (-56%) Only a quarter of the 142 companies that went public in 2000 remain listed on the trading floor today, making this a significant milestone achievement Key highlights: 1 2 3 1. Previously NEMAX50

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© ATOSS Software SE 20257 Workforce Management landscape continues to grow and evolve Global trends in the WFM market Digitalization of labor: AI-driven WFM solutions enhance efficiency and business value for both employees and managers11 Increasing regulatory complexity: Europe’s multi-layered regulations including collective bargaining agreements increase demand for WFM solutions that simplify compliance and streamline management, particularly for hourly paid workers Resource and skilled staff scarcity: Workforce scarcity has accelerated investment in advanced scheduling and employee experience initiatives to optimize deployment, retention and efficiency 1 2 3 6,9 7,5 8,2 9,0 9,8 10,7 11,7 12,8 2023 2024 2025 2026 2027 2028 2029 2030 9% Global collective bargaining coverage rate2 75% 50% 25% 1. Gartner, Market Guide for WFM Applications 2022; 2. ILOSTAT; 3. ATOSS estimates and third party data as of March 2025 WFM market size development ($bn)3 30% 36% 23% 6% 6% Europe North America Asia Pacific MEA LATAM 11% 10% 9% 8% 6% Market size by geo (2023)3 CAGR by geo (2023-2030)3

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© ATOSS Software SE 20258 Workforce Management by ATOSS in a nutshell Efficiency via highly flexible staff deployment Full-range provider Retail Manufacturing Logistics Healthcare Services >10k >1k >500 >30 1-30 Complexity of requirements Industry focus: ATOSS Staff Efficiency Suite ATOSS Time Control Crewmeister # of employees 1. Included in ATOSS product vision Time Management Personnel Deployment Planning Qualification Management Absence Management Self Services Time Evaluation Engine (TEE) HCM vendor agnostic

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© ATOSS Software SE 20259 ATOSS’ product portfolio supports customers‘ shifting needs Full-range solutions span varying areas of need and complexity, resulting in strong ROI for customers ATOSS helps companies to have ... …the right employee …with the right qualification …at the right place …at the right time …at the right cost …at full compliance Goal Demand and cost-optimized synchronization of working time and order volume Current situation Fluctuation in demand Little flexibility and long response times Staff hours Time Time Non-demand-optimized Demand-optimized Surplus/shortfall OPTIMIZATION POTENTIAL Personnel availability AFTER OPTIMIZATIONStaff hours up to 70% Reduced personnel costs in HR up to 80% Reduced planning effort up to 90% Savings in overtime up to 50% Increased efficiency up to 10.000 h/p.a. Freeing up capacities through self-services up to 75% Time savings through automatic reports Exemplary: Effects generated from ATOSS Projects – Cross-industry (figures per Year)1 1. Figures based on specific client case studies

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© ATOSS Software SE 202511 ATOSS – 19th record year anticipated Running like clockwork Strong growth track record, excellent traction in Cloud transition and expansion outside the DACH region Total revenue in EURm Software revenue in EURm EBIT in EURm 13%2 25%224%2 34%2 52% NON-DACH revenue in EURm 22 24 27 29 29 32 33 36 40 45 50 55 63 71 86 97 114 151 171 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 +7%1 +16%1 3 4 5 6 7 7 8 8 10 11 14 14 17 19 26 27 31 52 63 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2020 48.8 (74%) 2021 12.6 65.8 (84%) 2022 88.6 (82%) 2023 111.3 (89%) 2024 56.0 66.0 78.4 108.2 124.9 16.5 17.2 19.6 13.5 39.5 (71%) +18% +19% +38% +15% Non Recurring Revenue Recurring Revenue 25% 2020 40% 2021 52% 2022 55% 2023 57% 2024 2.9 4.0 5.6 8.4 9.8 36% Non Recurring Recurring 37%2 1. Average growth rate; 2. EBIT as % of total revenue

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© ATOSS Software SE 202512 Cloud MRR & ARR (Cloud + Maintenance) development Actuals 2024 Cloud MRR: Quarterly development in EURm ARR Total (Cloud + Maintenance) in EURm Share of Cloud & subscription in recurring revenue in % Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4Q1 1.4 1.5 1.7 2.0 2.4 2.7 3.1 3.4 4.0 4.3 4.6 4.9 5.6 5.9 6.3 6.6 +35% 2021 2022 2023 2022 58.9 36.5 2023 79.3 39.2 2024 27.7 2020 23.5 29.5 2021 41.0 33.8 41.0 53.1 74.8 95.4 118.4 13.3 +29% +41% +27% +24%ARR Cloud ARR Maintenance 8% 65% 21% 6% Licences Recurring Revenue CSS HW & Others (Cloud & Subscription (42%); Maintenance (23%) 24% 2019 33% 2020 41% 2021 52% 2022 60% 2023 65% 2024 100% Increasing share of Cloud & subscription in recurring revenue Maintenance Cloud & Subscription 2024

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© ATOSS Software SE 202513 ATOSS Cloud development by products 2024 Cloud ARR1 in EURm Net Retention Rate2 New customer ARR3 Cloud KPIs in % New customer ARR3 by product, in % ASES ATC Crew- meister Total Average Churn-Rate4 ~ 73% 18% 9% 2023 73% 18% 9% 2024 58.9 79.3 +35% ASES ATC Crewmeister 117% 113% 93% 15% 12% 15% 30% -2,9% 114% 63% 19% 18% ASES ATC Crewmeister 1. ARR (Annual Recurring Revenue) comprises the turnover generated by the company over the next 12 months on the basis of cur rent monthly cloud usage fees applicable as of the qualifying date 2. Net Retention Rate: revenue generated from existing customers as of PY - taking into account expansion and churn 3. Share of New Customer ARR: revenue generated from new customers since Q4 PY – taking into account base, expansion, indexation and migration of on-premises customers 4. Churn Rate: calculated as contract terminations and contractions divided by current year ARR (w/o Crewmeister)

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© ATOSS Software SE 202514 Cloud order backlog Growth ambitions strongly supported by order backlog Cloud revenue Cloud order backlog Cloud order backlog (12 months)1 in EURm Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 10.1 11.8 13.0 13.6 14.5 16.4 17.5 18.7 19.7 +35% 2022 2023 2.3 41.0 Q4 2022 3.6 55.3 Q3 2023 5.4 58.9 Q4 2023 4.2 76.0 Q3 2024 6.5 79.3 Q4 2024 43.3 59.0 64.3 80.1 85.8 +33% 2024 1. Cloud order backlog: ARR + contractually committed additions & expansions for the next 12 months

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© ATOSS Software SE 202516 Top Key Figures Q1 2025 - Revenues Software Revenue in EURmTotal Revenue in EURm 7% Q1 2019 11.8 (60%) 31% 9% 15.4 (67%) 27% 6% Q1 2021 17.1 (66%) 28% 6% Q1 2022 25.2 (70%) 23% Q1 2025 5% 22% Q1 2024 34.0 (74%) 7% 22% 29.7 (71%) Q1 2023 7% 10.8 (64%) 29% Q1 2020 19.8 23.0 26.0 36.2 41.8 46.3 16.9 +17% +16% +13% +39% +16% +11% Software CSS HW & Others 7.5 (69%) Q1 2019 2.7 9.1 (77%) Q1 2020 11.0 (72%) Q1 2021 2.0 15.0 (88%) Q1 2022 4.7 20.5 (81%) 31.3 (92%) 2.7 Q1 2025Q1 2024 26.1 (88%) 3.7 Q1 2023 3.4 10.8 4.4 15.4 17.1 25.2 29.7 34.0 11.8 +9% +30% +11% +47% +18% +14% Non-Recurring Revenue Recurring Revenue

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© ATOSS Software SE 202517 Cloud MRR & ARR (Cloud + Maintenance) development Q1 2025 Cloud MRR: Quarterly development in EURm ARR Total (Cloud + Maintenance) in EURm Share of Cloud & subscription in recurring revenue in % Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1Q1 1.4 1.5 1.7 2.0 2.4 2.7 3.1 3.4 4.0 4.3 4.6 4.9 5.6 5.9 6.3 6.6 7.2 +29% 2021 2022 2023 Q1 2023 67.2 38.5 Q1 2024 86.7 39.7 Q1 2025 27.1 Q1 2021 28.2 31.5 Q1 2022 48.5 35.2 43.6 59.7 83.6 105.6 126.4 16.4 +37% +40% +26% +20%ARR Cloud ARR Maintenance 6% 68% 22% 5% Licences Recurring Revenue CSS HW & Others (Cloud & Subscription (46%); Maintenance (22%) 41% 2021 52% 2022 60% 2023 65% 2024 71% 2025 Increasing share of Cloud & subscription in recurring revenue Maintenance Cloud & Subscription 2024 2025

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© ATOSS Software SE 202518 ATOSS Cloud development by products Q1 2025 Cloud ARR1 in EURm Net Retention Rate2 New Customer ARR3 Cloud KPIs in % New customer ARR3 by product, in % ASES ATC Crew- meister Total Average Churn-Rate4 ~ 73% 18% 9% Q1 2024 73% 18% 9% Q1 2025 67.2 86.7 +29% ASES ATC Crewmeister 113% 107% 91% 15% 12% 15% 30% -2,8% 110% 63% 19% 18% ASES ATC Crewmeister 1. ARR (Annual Recurring Revenue) comprises the turnover generated by the company over the next 12 months on the basis of cur rent monthly cloud usage fees applicable as of the qualifying date 2. Net Retention Rate: revenue generated from existing customers as of PY - taking into account expansion and churn 3. Share of New Customer ARR: revenue generated from new customers since Q4 PY – taking into account base, expansion, indexation and migration of on-premises customers 4. Churn Rate: calculated as contract terminations and contractions divided by current year ARR (w/o Crewmeister)

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© ATOSS Software SE 202519 Cloud order backlog Growth ambitions strongly supported by order backlog Cloud revenue Cloud order backlog Cloud order backlog (12 months)1 in EURm Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 Q1 10.1 11.8 13.0 13.6 14.5 16.4 17.5 18.7 19.7 21.4 +30% 2022 2023 2.3 41.0 Q4 2022 5.4 58.9 Q4 2023 4.2 67.2 Q1 2024 6.5 79.3 Q4 2024 6.1 86.7 Q1 2025 43.3 64.3 71.3 85.8 92.8 +30% 2024 1. Cloud order backlog: ARR + contractually committed additions & expansions for the next 12 months 2025

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© ATOSS Software SE 202520 Software Consulting Hardware & Others 34,029 EURk Recurring: 31,315 EURk Non-recurring: 2,714 EURk 10,035 EURk 2,187 EURk Revenue 46,251 EURk Gross profit 36,081 EURk Cost of sales (10,169 EURk) Operating profit 15,581 EURk Operating expenses (20,501 EURk) Net profit 11,314 EURk Financial Earnings 1,108 EURk Tax (5,375 EURk) S&M (8,939 EURk) R&D (7,111 EURk) G&A (4,220 EURk) Other (230 EURk) Income statement Q1 2025

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© ATOSS Software SE 202521 Cost ratios Q1 2025 vs. FY 2025 Plan R&D as % of total revenue S&M as % of total revenue G&A as % of total revenue Total revenue: EUR 46.3m Cost of sales as % of total revenue 22.0% -2.0 pp1 1. Delta to PY YTD 2. Excl. additional cost reserve of 1.5% for specific investments 15.4% 19.3% 9.1% +0.1 pp1 +1.3 pp1 +0.3 pp1 Actual cost ratiosQ1 2025 in % R&D as % of total revenue S&M as % of total revenue G&A as % of total revenue Cost of sales as % of total revenue 24.1% Planned cost ratiosFY252 in % 16.0% 19.2% 8.2%

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© ATOSS Software SE 202522 Income statement (IFRS) Q1 2025 1. In accordance with IAS 33.64, earnings per share (EPS) were adjusted retrospectively for previous periods as a result of the s hare split carried out in June 2024 in EURk Q1 2025 Proportion of total revenue Q1 2024 Proportion of total revenue Change 2025 / 2024 0 0 0 0 0 0 Total revenues 46,251 100% 41,843 100% 11% Software 34,029 74% 29,722 71% 14% Licenses 2,714 6% 3,654 9% -26% Maintenance 9,959 22% 9,654 23% 3% Cloud & Subscriptions 21,356 46% 16,415 39% 30% Consulting 10,035 22% 9,280 22% 8% Hardware 1,144 2% 1,966 5% -42% Others 1,043 2% 875 2% 19% 0 0,000 0 0,000 0 0 EBITDA 16,721 36% 15,070 36% 11% EBIT 15,581 34% 14,019 34% 11% EBT 16,689 36% 14,507 35% 15% Net profit 11,314 24% 9,759 23% 16% EPS in euro* 0.71 0 0.62 0 16%

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© ATOSS Software SE 202523 ATOSS – Growth projections Strong growth and margins while building recurring revenue Total revenue ~ 190 EURm EBIT margin ≥ 31% Increasing share of recurring revenue (Target: Year end 2027) ~ 75% Total revenue growth (Base: Year end 2024) CAGR >13% Software revenue growth (Base: Year end 2024) CAGR 17% EBIT margin (Target: Year end 2027) ≥33% Projections 2025 - 2027Guidance 2025

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© ATOSS Software SE 202525 Core pillars of ATOSS’ growth strategy Growth leading the way for increased recurring revenue from Cloud business and an ever-growing global subscriber base Continuous steady growth while actively driving cloud transformation of business Continued focus on operational excellence to maintain and further expand margins of business Increase international revenue share outside the DACH region Further product development and enhancement, e.g., AI & Analytics Projections 2025-2027 EBIT margins ≥31% Increasing share of recurring revenue ~ 75% (Target: Year end 2027) R&D investment ~16% of total revenue Advance full range strategy with solutions for enterprise, mid- market and SMEs customers (Crewmeister) Crewmeister outlook 2027 • ~27.000 customers • ARR of ~15m EUR • Reach profitability • ATOSS solution is deployed across most of the European countries and supports 11 software languages, enabling multilingual functionality • In 2024, 6% of revenue is generated outside the DACH region • We will focus on driving revenue in our existing European markets, to further expand international revenue share 2025-2027: Total revenue growth CAGR >13%

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© ATOSS Software SE 202526 ATOSS – Leading in the field of Workforce Management Strong growth potential with a clear path to 16% CAGR through 2030 1. As of 12/31/2024 ; 2. w/o Crewmeister; 3. ARR churn w/o Crewmeister We are a leading Workforce Management provider with tailored solutions for international Enterprise, SMB, and small-business customers, fueled by strong historic growth and performance metrics to drive our future growth strategy Key factors supporting growth ambition1Total revenue in EURm Ambition 114 151 171 2022 2023 2024 2025 guidance 2026 proj. 2027 proj. 2030 ambition ~190 ≥215 ≥245 ~400 +19% ~ 1,200 Enterprise customers ~ 2,000 SMB customers ~ 15,100 small business customers ~ 15,900 Cloud customers >4m employees integrated in ATOSS solutions 116% Net retention rate2 2.9% Cloud churn rate3 % % 820+ employees 37% EBIT margin Double-digit revenue growth (yoy since FY14) % 27% 34% 37% ≥31%EBIT% >35%≥32% ≥33% Rule of 44% Rule of 67% Rule of 50% Rule of 42% Rule of 45% Rule of 47% +16%

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© ATOSS Software SE 202527 Ambition ATOSS Cloud transformation (1/2) Growth leading the way for increased recurring revenue (model projection) Revenue in EURm and growth in % (YOY) 58% 2022 59% 2023 65% 69% 2025 guidance ~72% 114 151 171 ≥ 215 ≥ 245 ~400 2030 ambition2024 ~80% 2027 proj. ~75% 2026 proj. ~ 190+33% +13% +11% +16%1 Non Recurring Recurring 1. Compound Annual Growth Rate

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© ATOSS Software SE 202528 Ambition ATOSS Cloud transformation (2/2) Growth leading the way for increased recurring revenue (model projection) 40% 44% 2022 18% 33% 2023 11% 31% 58% 2024 8% 27% 65% 2025 guidance ~6% ~4% 108 2030 ambition 16% 78 2027 proj. 125 ≥ 142 ≥ 165 ≥ 194 ~320 49% ~82% ~14% 2026 proj. ~73% ~21%+38% +15% +14% +18% Licenses Maintenance Maintenance/Cloud1 Cloud & Subscriptions 1. Depending on extent of transformation of existing on- premise customers into Cloud and subscription customers; 2. Compound Annual Growth Rate Software revenue in EURm. and growth in % (YOY)

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© ATOSS Software SE 202529 ATOSS full range strategy Crewmeister continues successful development 2020 2021 2022 2023 2024 2025 guidance 2026 proj. 2027 proj. 2030 ambition 4.1 6.0 8.6 12.0 15.1 ~19.0 ~23.0 ~27.0 ~40.0 38% 2020 2021 2022 2023 2024 2025 guidance 2026 proj. 2027 proj. 2030 ambition 1.0 1.7 2.6 4.3 6.3 ~8.0 ~11.0 ~14.0 ~25.0 60% 2020 2021 2022 2023 2024 2025 guidance 2026 proj. 2027 proj. 2030 ambition ~41.4 ~44.0 ~48.0 ~56.0 25.4 30.5 29.9 34.7 39.8 12% Customer development (k) Sales development (EURm) MRR/Customer ratio (EUR)4 Avg. growth rate Avg. growth rate Avg. growth rate Highlights • Positive impact by BAG decision • New product features developed • High customer satisfaction Key metrics • Avg. Customer Acquisition Costs1: 583 EUR • Avg. Customer Lifetime Value2: 2,236 EUR • CLTV/CAC-Ratio: 3.8 • Avg. monthly churn rate3: 1.42 % • Cloud gross margin: +79% Outlook 2025 • ~19.000 Customers • ARR of ~9m EUR • Further margin improvement 1. CAC (Customer acquisition cost) (ø 2024): cost of resources for the business in order to acquire a new customer. Customer acquisition cost involves sales and marketing costs 2. CLTV (Customer lifetime value) (ø 2024): estimate of all the future gross profits to be accumulated from a relationship wi th a given customers 3. Churn rate (12/2024): Ratio, in the current year (12 month avg.), of customer terminations (number) and the total number of c ustomers (number) with an existing contract at the end of the year/month 4. MRR/Customer Ratio shows the monthly recurring revenue per customer calculated on the MRR and Customers as of the 31st of December each year +18% +26% +6%

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© ATOSS Software SE 202531 Sustainability at ATOSS Our sustainability pillars Customer and society • Data protection and data security • Customer satisfaction • Social and cultural activities Employees at ATOSS • Recruitment and retention • Continuous training and learning • Health promotion and recreation • Diversity

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© ATOSS Software SE 202532 Sustainability at ATOSS Our sustainability pillars Integrity and compliance • Prevention of discrimination, corruption, bribery, respect for human rights • Compliance Management System – acting in accordance with all laws, social guidelines and values Environmental protection • Energy & CO2 reduction • Conservation of resources

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© ATOSS Software SE 202533 Sustainability at ATOSS Our goals (1/2) Customer and society Customers Goals till 2025: • Recurring revenue: ~70% • Revenue CAGR (2023-2025): 19% • Grow Customer Number: 20,000+ • Expand International Customer base In addition: • Cloud Churn: <2% per year • Net Retention Rate: >110% • R&D investment: ~16% of total revenue • Net promoter score: ≥10 Social • Continued donations in the areas of culture, environment, children and social projects Employees at ATOSS Employee Experience Goals by 2025: • Employee Engagement Index: >80% • Leadership Index: 3.7 • Employee Net Promoter Score: ≥25 • Working Flexibility Satisfaction Index: ≥75% Diversity & Inclusion Goals by 2027: • Company-wide gender distribution: 50% female / 50% male • Gender distribution of managers: 40% female / 60% male • Gender distribution Executive Leadership Team: 30% female / 70% male

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© ATOSS Software SE 202534 Sustainability at ATOSS Our goals (2/2) Integrity and Compliance Integrity and Compliance • Continuing to raise awareness of compliance and security issues (incl. compliance training) • Further internal training measures on topics such as equal treatment and compliance Information security • Recertification according to ISO/IEC 27001:2022 Environmental protection CO2 footprint Goals by 2045: • Net Zero Strategy: reduction of Scope 1-3 greenhouse gas emissions by a total of 90 percent Goals by end of 2025: • 100% green electricity at all ATOSS sites by 2025

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© ATOSS Software SE 202535 Employees at ATOSS Working with Passion & Purpose „We live diversity and promote equal opportunities and inclusion” • Member of “Charta der Vielfalt” • Employees from around 49 countries • 60% male/40% female > ongoing diversity goals by 2027 „We are top employer“ • Employee Engagement Index: 83% “Individuality in Working Life - Employee Well-being in Focus” • Hybrid and flexible working model • Sport offers and health management • Team and after-work events “The team is the key to sustainable success” • Intensive and structured onboarding • Detailed career model • Working in diverse teams / short • Decision-making paths • Meaningful working environment “Continuous employee growth” • 820 employees (12/23: 775)

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© ATOSS Software SE 202536 Continuous expansion of personnel capacities 146 156 172 180 185 206 208 288 310 305 92 100 115 125 149 162 187 180 192 193 55 58 71 87 95 110 144 158 192 193 193 47 53 59 73 74 79 91 106 115 125 125 2015 2016 2017 2018 2019 2020 2021 1731 2561 2022 2023 2024 Q1 252 340 367 417 465 503 557 630 693 775 820 816 Administration Sales & Marketing Services Innovation & Development 1. In FY 2022 shift of Cloud Services Team from Services Department to Innovation & Development Department 2. Including 11 FTE in Global Capabilities Center

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© ATOSS Software SE 202538 ATOSS Cloud development by products Q1 2025 6.9 Existing Customers ARR Customer Base 12.6 New & Migrated Customers ARR 03.2025 67.2 74.1 86.7 ARR 03.2024 +29% +110% Net Retention Rate GRR2 NRR3 ASES 49.2 ATC 12.1 96.4% 6.6 113.5% 55.8 7.9 63.7 96.4% 0.9 107.0% 13.0 2.4 15.4 Crewmeister 5.9 90.8% 5.3 2.3 7.6-0.5- 1. ARR (Annual Recurring Revenue) comprises the turnover generated by the company over the next 12 months on the basis of cur rent monthly cloud usage fees applicable as of the qualifying date 2. Gross Retention Rate: Percentage of existing customers or revenue retained over the last 12months, excluding expansion and new customers 3. Net Retention Rate: Revenues generated from existing customers as of PY - taking into account expansion and churn (based on PY ARR) Cloud ARR1 in EURm

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© ATOSS Software SE 202539 31 Jan 2023: Preliminary FY 2022 results Total rev. growth: +17% Software growth: +19% Recurring rev. growth: +35% EBIT Margin: 27% Forecast for the years 2023- 2025 raised 31 Jan 2022: Preliminary FY 2021 results Total rev. growth: +13% Software growth: +18% Recurring rev. growth: +23% EBIT Margin: 28% Mid-term sales growth guidance upgraded to 13-17% 29 Jan 2021: Preliminary FY 2020 results Total rev. growth: +21% Software growth: +20% Recurring rev. growth: +23% EBIT Margin: 30% The ATOSS Share Share price performance1 (1 January 2020 – 31 March 2025) Share price in EUR 0 50 100 150 01.01.2020 01.07.2020 01.01.2021 01.07.2021 01.01.2022 01.07.2022 01.01.2023 01.07.2023 01.01.2024 01.07.2024 01.01.2025 ATOSS SDAX TecDAX 246% 21% 19% 31 Jan 2024: Preliminary FY 2023 results Total rev. growth: +33% Software growth: +38% Recurring rev. growth: +35% EBIT Margin: 34% (1) SDAX/TecDax Index rebased on ATOSS‘ share price of EUR 36,125 as of 01/02/2020 31 Jan 2025: Preliminary FY 2024 results Total rev. growth: +13% Software growth: +15% Recurring rev. growth: +26% EBIT Margin: 37%

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© ATOSS Software SE 202540 ATOSS stock High performer in European software and HCM stocks Share price performance1 (01/2020 – 03/31/2025) HCM SaaS European Software ATOSS SAP Nemetschek Paylocity Workday SDAX TecDAX TeamViewer 246% 104% 82% 62% 48% 21% 19% -63% (1) ATOSS, Nemetschek, TeamViewer, SAP, Invision, SDAX: XETRA- Opening price 01/02/2020 and - Closing price 03/31/2025; Paylocity: Frankfurt Stock Exchange-Opening price 01/02/2020 and - Closing price 03/31/2025; Workday: Tradegate -Opening price 01/02/2020 and - Closing price 03/31/2025

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© ATOSS Software SE 202541 Ambition Strategic investments in 2025 to drive long-term revenue growth and profitability FY 24 EBIT margin GTM Organization R&D Other FP 25 EBIT margin FY 30 EBIT margin ambition 37% ≥ 31% > 35% 1 2 3 In 2025, we are entering a strategic investment phase to lay the foundation for sustainable long-term growth and scalability. Key focus areas include: • GTM Organization: Building a scalable, data-driven sales engine by enhancing marketing, demand generation, and SDR capabilities to improve lead qualification • R&D: Accelerating Cloud transformation by driving Cloud-based innovation to migrate existing customers to Cloud solutions • Other: Digitalization projects to improve efficiency and further investments in Crewmeister These initiatives will temporarily impact profitability but are critical to unlocking scalability, and achieving our long- term financial objectives of ~€400m revenue and >35% EBIT margin in 2030. 1 2 3 EBIT margin in % 2025 marks the beginning of a strategic investment phase to build the foundation for sustainable growth and scalability 24.1% Cost of Sales (as % of revenue) 8.2%16.0% 19.2% R&D (as % of revenue) S&M (as % of revenue) G&A (as % of revenue) Cost ratios1 in % 1. Excl. additional cost reserve of 1.5% for specific investments

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© ATOSS Software SE 202542 Financial development Q1 2025 Cash Flow in EURk Liquidity in EURk 29,449 -314-805-360 03/24 20,239 9,769 -873-124 03/25 27,970 29,010 Operating activities Investment activities Financial activities Exchange rates 82,667 5,221 4,307 20,022 12/24 111,677 5,268 4,944 10,022 03/25 112,216 131,910 +29,010 EURk Cash & cash equivalents Investment funds Gold Fixed term deposits Change in Cash & cash equivalents Impressive cash position

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© ATOSS Software SE 202543 The ATOSS share Dividend policy EPS1 per 31. December in EUR Dividend1 in EUR 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 0.36 0.36 0.19 0.44 0.48 0.58 0.59 0.70 0.85 1.12 1.22 1.22 2.25 2.86 2012 0.73 0.18 2013 2014 2015 0.46 0.24 2016 2017 2018 0.65 0.35 2019 2020 2021 2022 0.50 2011 2023 2024 2025 0.91 0.70 1.00 1.42 2.132 0.15 0.18 0.18 0.22 0.29 0.29 0.64 0.84 0.91 1.69 0.92 Special Dividend Dividend 1. The previous year’s figures have been adjusted due to stock split in June 2024; Rounding up to 2 decimal places; 2. Subject to s hareholder resolution in AGM ATOSS stays true to its dividend policy with continuity to the previous year

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© ATOSS Software SE 202544 Financial KPIs Financial strength excellent base for further growth Net income in EURm Dist. Dividend per share1 in EUR EPS1 in EUR Operational Cashflow in EURm Equity Ratio in % Market capitalization in EURm 2020 2021 2022 2023 2024 48% 48% 53% 54% 56% 2020 2021 2022 2023 2024 1,257 1,726 1,107 1,662 1,816 2020 2021 2022 2023 2024 17.7 19.3 19.4 35.8 45.5 21% 20% 17% 24% 2020 2021 2022 2023 2024 1.12 1.22 1.22 2.25 2.86 2020 2021 2022 2023 2024 0.64 0.84 0.91 1.42 0.50 0.92 1.69 2020 2021 2022 2023 2024 23.2 26.3 26.3 52.7 59.5 Special RegularNet income margin As of year end 27% 1. The previous year’s figures have been adjusted due to stock split in 2024; rounding up to two decimal places

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© ATOSS Software SE 202545 On-premises order backlog ARR On-premises order backlog1 Quarterly development in EURm Q4 Q1 Q2 Q3 Q4 Q1 Q2 Q3 Q4 7.3 6.9 5.9 4.9 4.7 3.5 3.7 3.9 3.1 -33% 1. Typically revenue transformation within 12 -18 months 2022 2023 2024

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© ATOSS Software SE 202546 Revenue break even Cloud vs. On-premises model Revenue/Payment scheme 50 50 50 50 50 120 20 20 20 20 0 20 40 60 80 100 120 Year 1 Year 2 Year 3 Year 4 Year 5 Cloud (SaaS) On-Premises Cloud vs. On-Premises Cloud vs. On-Premises (accumulated) • Cloud services lead to service optimization and cost savings for ATOSS customers • Service optimization and cost savings allow for increased accumulated revenue after 3.5 years 50 100 150 200 250 120 140 160 180 200 0 50 100 150 200 250 Year 1 Year 2 Year 3 Year 4 Year 5 Cloud (SaaS) On-Premises

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© ATOSS Software SE 202547 ATOSS sales by segment1 The five largest customers account for approx. 6 percent of company‘s sales. 22% 32%15% 16% 5% 10% Retail ProductionServices Healthcare & Social Services other Logistics 13% 87% Retail-Fashion Retail - Food, DIY, etc. 1. FY 2024/revenue

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