OS Q3 2025 Earnings Presentation

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Earnings November 2025 Q3 2025

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ONESTREAM SOFTWARE | ALL RIGHTS RESERVED. 2 This presentation is made by OneStream, Inc. (the “Company,” “we,” “our” or “we”) and contains forward - looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. All statements other than statements of historical facts contained in this presentation may be forward - looki ng statements. In some cases, you can identify forward - looking statements by terms such as “may,” “will,” “should,” “expects,” “plans,” “anticipates,” “could,” “intends,” “targets, ” “ projects,” “contemplates,” “believes,” “estimates,” “predicts,” “potential” or “continue” or the negative of these terms or other similar expressions. Forward - looking statements contained in t his presentation include, but are not limited to, statements about our financial outlook for total revenue, non - GAAP operating margin, non - GAAP net income per share and equity - based compens ation for the fourth quarter and full year ending ending December 31, 2025. Forward - looking statements are subject to known and unknown risks, uncertainties, assumptions and other factors. Some of these r isks are described in greater detail in our filings with the Securities and Exchange Commission, including our most recently filed Quarterly Report on Form 10 - Q or Annual Report on Form 10 - K. It is not possible for our management to predict all risks, nor can we assess the impact of all factors on our business or the extent to which any factor, or combination of f act ors, may cause our actual results to differ materially from those contained in any forward - looking statements we may make. These factors may cause our actual results, performance or achiev ements to differ materially and adversely from those anticipated or implied by our forward - looking statements. Furthermore, if our forward - looking statements prove to be inaccurate, the inaccuracy may be material. In light of the significant uncertainties in these forward - looking statements, you should not rely on these statements or regard these statements as a repre sentation or warranty by us or any other person that we will achieve our objectives and plans in any specified timeframe, or at all. We undertake no obligation to update any forward - lo oking statements, whether as a result of new information, future events or otherwise, except as required by law. In addition, statements that “we believe” and similar statements reflect our beliefs and opinions on the relevant subject . These statements are based upon information available to us as of the date of this presentation, and although we believe such information forms a reasonable basis for such statements, such information may be limited or incomplete, and our statements should not be read to indicate that we have conducted a thorough inquiry into, or review of, all potentially available relevant information . These statements are inherently uncertain and you are cautioned not to unduly rely upon these statements . In addition to GAAP financial measures, this presentation includes non - GAAP financial measures and key performance indicators that we use to help us evaluate our business, identify trends affecting our business, formulate business plans and make strategic decisions . There are limitations to the non - GAAP financial measures included in this presentation, and they may not be comparable to similarly titled measures of other companies . The non - GAAP financial measures included in this presentation should not be considered in isolation from or as a substitute for their most directly comparable GAAP measures . Please see the Appendix for a reconciliation of each non - GAAP financial measure to the most directly comparable GAAP financial measures . Disclaimer

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ONESTREAM SOFTWARE | ALL RIGHTS RESERVED. 3 Free Cash Flow Margin (1) Non - GAAP Gross Margin (1) Total Revenue 69 % 3% $154M 19% y/y growth Note: 1. See Appendix for definition and for a reconciliation to the most directly comparable GAAP measure. Non - GAAP Operating Margin (1) 6% Q3’25 Financial Highlights Subscription Revenue $141M 27% y/y growth

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ONESTREAM SOFTWARE | ALL RIGHTS RESERVED. 4 Delivering Strong Revenue Growth at Scale 27% y/y Growth of Subscription Revenue in Q3’25 $111 $119 $125 $134 $141 $12 $7 $6 $7 $8 $7 Q3’24 Q4’24 $4 Q1’25 Q2’25 $4 Q3’25 $129 $132 $136 $148 $154 Professional Services & Other Revenue License Revenue Subscription Revenue 39% 35% 31% 30% 21% 29% 24% 26% Subscription Revenue y/y Growth Total Revenue y/y Growth 19% 27% Note: Totals may not foot due to rounding. ($ in Millions) $195 $303 $428 $50 $41 $32 $29 $34 FY22 $31 FY23 FY24 $279 $375 $489 34% 55% 31% 41% $8 $9

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ONESTREAM SOFTWARE | ALL RIGHTS RESERVED. 6 Billings (1) Trends 21% LTM y/y Growth $149 $167 $154 $151 $178 27% 24% 24% 23% 21% Q3’24 Q4’24 Q1’25 Q2’25 Q3’25 +20% Note: 1. See Appendix for definition and for a reconciliation to the most directly comparable GAAP measure. ($ in Millions) LTM Billings y/y Growth $335 $451 $560 35% 24% FY22 FY23 FY24

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ONESTREAM SOFTWARE | ALL RIGHTS RESERVED. 7 Quarterly Non - GAAP Gross Profit & Margin NON - GAAP SOFTWARE GROSS PROFIT & MARGIN (1) NON - GAAP GROSS PROFIT & MARGIN (1) ($ in Millions) $95 $96 $98 $106 $109 78% 76% 76% 76% 75% Q3’24 Q4’24 Q1’25 Q2’25 Q3’25 $93 $96 $103 $107 71% 70% 70% 70% 69% $92 Q3’24 Q4’24 Q1’25 Q2’25 Q3’25 % Margin Note: 1. See Appendix for definition and for a reconciliation to the most directly comparable GAAP measure.

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ONESTREAM SOFTWARE | ALL RIGHTS RESERVED. 8 Quarterly Non - GAAP Operating Expenses (1) Increasing OpEx Leverage ($ in Millions) NON - GAAP SALES & MKTG (2) NON - GAAP RESEARCH & DEV (2) NON - GAAP GENERAL & ADMIN (2) $48 $45 $53 $58 $53 37% 34% 39% 39% 35% Q3’24 Q4’24 Q1’25 Q2’25 Q3’25 $22 $24 $24 $24 16% 16% 18% 16% 16% $20 Q3’24 Q4’24 Q1’25 Q2’25 Q3’25 $18 $17 $19 $20 $20 14% 13% 14% 13% 13% Q3’24 Q4’24 Q1’25 Q2’25 Q3’25 % of Revenue Notes: 1. See Appendix for definition. 2. See Appendix for a reconciliation to the most directly comparable GAAP measure.

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ONESTREAM SOFTWARE | ALL RIGHTS RESERVED. 9 Non - GAAP Operating Income / (Loss) (1) 6% 4% 7% 0% 1% $9 $2 $9 $5 Q3’24 Q4’24 Q1’25 Q2’25 Q3’25 ($1) ($ in Millions) Non - GAAP Operating Margin (1) Note: 1. See Appendix for definition and for a reconciliation to the most directly comparable GAAP measure. ($51) FY22 ($ 22) FY23 $1 FY24 (18%) (6%) 0% Non - GAAP Operating Margin Improved 2 percentage points y/y

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ONESTREAM SOFTWARE | ALL RIGHTS RESERVED. 10 Free Cash Flow (1) Generated $95M in Free Cash Flow Over the Past Four Quarters ($ in Millions) 3% 1% 19% 26% 20% $25 $36 $29 $5 $1 Q3’24 Q4’24 Q1’25 Q2’25 Q3’25 Free Cash Flow Margin (1) Note: 1. See Appendix for definition and for a reconciliation to the most directly comparable GAAP measure. ($38) $19 $59 FY22 FY23 FY24 (14%) 5% 12%

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ONESTREAM SOFTWARE | ALL RIGHTS RESERVED. 11 Guidance TOTAL REVENUE NON - GAAP OPERATING MARGIN ( 1) Q4’25 $156M to $158M 4% to 6% FY25 $594M to $596M 2% to 3% NON - GAAP NET INCOME PER SHARE (1) $0.04 to $0.07 $0.15 to $0.19 Notes: 1. See Appendix for definition. OneStream has not provided a reconciliation of its forward outlook for non - GAAP operating margin a nd non - GAAP net income per share to their most directly comparable GAAP financial measures in reliance on the unreasonable effor ts exception provided under Item 10(e)(1)( i )(B) of Regulation S - K. OneStream is unable to predict with reasonable certainty the amount and timing of adjustments that are u sed to calculate these non - GAAP financial measures, particularly related to equity - based compensation and employee stock transac tions and the related tax effects. EQUITY - BASED COMPENSATION ~$25M $115M to $120M

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ONESTREAM SOFTWARE | ALL RIGHTS RESERVED. 13 • Non - GAAP Gross Profit and Non - GAAP Gross Margin • Non - GAAP gross margin is our non - GAAP gross profit as a percentage of our total revenue. Non - GAAP gross profit equals our softwa re revenue and professional services revenue and fees less subscription costs and professional services costs adjusted for non - cash, non - operational and non - recurrin g items, including equity - based compensation expense, employer taxes on employee stock transactions and amortization of acquired intangible assets. Software rev enue represents revenue from the sale of access to our platform, either pursuant to SaaS contracts that we account for as subscription revenue or pursuant to perpe tua l or term - based software licenses that we account for as license revenue. Subscription revenue also includes cloud computing service fees and customer support and main ten ance for software under our term - based and perpetual licenses. Professional services revenue includes revenue from consulting, implementation and configuration serv ice s and training. • Software Revenue • Software revenue represents revenue from the sale of access to our platform, either pursuant to SaaS contracts that we accoun t f or as subscription revenue or pursuant to perpetual or term - based software licenses that we account for as license revenue. Subscription revenue also includes cloud compu ting service fees and customer support and maintenance for software under our term - based and perpetual licenses. Software revenue excludes revenue from professional se rvices and fees. • Non - GAAP Software Gross Profit and Non - GAAP Software Gross Margin • We define non - GAAP software gross profit as software revenue less subscription costs adjusted for non - cash, non - operational and non - recurring items, including equity - based compensation expense, employer taxes on employee stock transactions and amortization of acquired intangible assets . Non - GAAP software gross margin is our non - GAAP software gross profit as a percentage of our software revenue. • Non - GAAP Operating Expenses • We define non - GAAP operating expenses as operating expenses adjusted for non - cash, non - operational and non - recurring items, incl uding equity - based compensation expense, employer taxes on employee stock transactions, secondary offering costs, amortization of acquired intangible assets and acquisition - related costs. • Non - GAAP Operating Income / (Loss) and Non - GAAP Operating Margin • We define non - GAAP operating income / (loss) as loss from operations adjusted for non - cash, non - operational and non - recurring it ems, including equity - based compensation expense, employer taxes on employee stock transactions, secondary offering costs, amortization of acquired intan gib le assets and acquisition - related costs. Non - GAAP operating margin is non - GAAP operating income / (loss) as a percentage of total revenue. • Billings • Billings is a non - GAAP measure that we calculate by taking the change in deferred revenue less the change in unbilled accounts r eceivable between the start and end of the period and adding total revenue recognized in the same period. Key Financial Presentation Notes

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ONESTREAM SOFTWARE | ALL RIGHTS RESERVED. 14 Key Financial Presentation Notes • Total Customers • We define a customer as an entity with an active contract as of the measurement date. Organizations with multiple divisions, seg ments or subsidiaries may be counted as multiple customers. • Free Cash Flow and Free Cash Flow Margin • We define free cash flow as net cash provided by (used in) operating activities less purchases of property and equipment. We def ine free cash flow margin as free cash flow as a percentage of revenue. • Non - GAAP Net Income / (Loss) • We define non - GAAP net income / (loss) as net loss adjusted for non - cash, non - operational and non - recurring items, including equ ity - based compensation expense, employer taxes on employee stock transactions, secondary offering costs, amortization of acquired intangible assets and acqui sit ion - related costs. • Non - GAAP Net Income Per Share • We define non - GAAP net income per share as basic net loss per share adjusted for non - cash, non - operational and non - recurring ite ms, including equity - based compensation expense, employer taxes on employee stock transactions, amortization of acquired intangible assets, acquisition - related costs an d net loss attributable to non - controlling interests.

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ONESTREAM SOFTWARE | ALL RIGHTS RESERVED. 15 Non - GAAP Gross Profit & Gross Margin Reconciliation $000, except percentages Q3'24 Q4'24 Q1'25 Q2'25 Q3'25 2022 2023 2024 Total Revenue 129,140 132,475 136,309 147,590 154,303 279,324 374,921 489,407 GAAP Gross Profit 64,739 88,550 92,731 101,198 105,051 186,814 260,419 310,078 (+) Equity-Based Compensation Expense 26,867 3,943 2,743 1,824 1,878 78 15 30,810 (+) Employer Taxes on Employee Stock Transactions 53 333 132 137 97 - - 386 (+) Amortization of Acquired Intangible Assets - - - - 61 - - - Non-GAAP Gross Profit 91,659 92,826 95,606 103,159 107,087 186,892 260,434 341,274 GAAP Gross Margin 50% 67% 68% 69% 68% 67% 69% 63% Non-GAAP Gross Margin 71% 70% 70% 70% 69% 67% 69% 70% Software Revenue 122,456 125,569 128,798 139,592 145,099 245,524 343,441 459,929 GAAP Software Gross Profit 90,070 94,662 97,311 105,297 108,230 197,968 269,295 347,015 (+) Equity-Based Compensation Expense 4,981 958 706 634 534 - - 5,939 (+) Employer Taxes on Employee Stock Transactions 7 50 68 47 22 - - 57 (+) Amortization of Intangible Assets - - - - 61 - - - Non-GAAP Software Gross Profit 95,058 95,670 98,085 105,978 108,847 197,968 269,295 353,011 GAAP Software Gross Margin 74% 75% 76% 75% 75% 81% 78% 75% Non-GAAP Software Gross Margin 78% 76% 76% 76% 75% 81% 78% 77%

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ONESTREAM SOFTWARE | ALL RIGHTS RESERVED. 16 Non - GAAP OpEx & OpEx as % of Rev Reconciliation $000, except percentages Q3'24 Q4'24 Q1'25 Q2'25 Q3'25 2022 2023 2024 Total Revenue 129,140 132,475 136,309 147,590 154,303 279,324 374,921 489,407 GAAP Sales & Marketing 162,700 65,618 67,622 70,258 63,506 153,283 175,795 328,843 (-) Equity-Based Compensation Expense (114,713) (19,228) (13,868) (11,774) (9,377) (2,847) (3,938) (135,215) (-) Employer Taxes on Employee Stock Transactions (134) (913) (557) (889) (808) - - (1,047) Non-GAAP Sales & Marketing 47,853 45,477 53,197 57,595 53,321 150,436 171,857 192,581 GAAP Sales & Marketing as a % of Revenue 126% 50% 50% 48% 41% 55% 47% 67% Non-GAAP Sales & Marketing as a % of Revenue 37% 34% 39% 39% 35% 54% 46% 39% GAAP Research & Development 83,040 36,896 35,002 33,918 30,639 43,132 55,289 156,812 (-) Equity-Based Compensation Expense (62,251) (14,421) (10,548) (8,799) (6,134) (812) (518) (77,926) (-) Employer Taxes on Employee Stock Transactions (93) (486) (235) (511) (132) - - (579) (-) Amortization of Acquired Intangible Assets (275) (275) (275) (315) (275) - - (733) (-) Acquisition-Related Costs - - - (117) - - - - Non-GAAP Research & Development 20,421 21,714 23,944 24,176 24,098 42,320 54,771 77,574 GAAP Research & Development as a % of Revenue 64% 28% 26% 23% 20% 15% 15% 32% Non-GAAP Research & Development as a % of Revenue 16% 16% 18% 16% 16% 15% 15% 16% GAAP General & Administrative 74,170 33,442 29,980 29,262 28,364 49,684 59,847 143,951 (-) Equity-Based Compensation Expense (56,152) (14,990) (10,750) (9,037) (7,830) (4,526) (3,799) (72,446) (-) Employer Taxes on Employee Stock Transactions (112) (173) (243) (303) (139) - - (285) (-) Secondary Offering Costs - (1,325) - - - - - (1,325) (-) Acquisition-Related Costs - - - (126) - - - - Non-GAAP General & Administrative 17,906 16,954 18,987 19,796 20,395 45,158 56,048 69,895 GAAP General & Administrative as a % of Revenue 57% 25% 22% 20% 18% 18% 16% 29% Non-GAAP General & Administrative as a % of Revenue 14% 13% 14% 13% 13% 16% 15% 14%

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ONESTREAM SOFTWARE | ALL RIGHTS RESERVED. 17 Non - GAAP Op Income / (Loss) & Op Margin Reconciliation $000, except percentages Q3'24 Q4'24 Q1'25 Q2'25 Q3'25 2022 2023 2024 Total Revenue 129,140 132,475 136,309 147,590 154,303 279,324 374,921 489,407 GAAP Operating Loss (255,171) (47,406) (39,873) (32,240) (17,458) (59,285) (30,512) (319,528) (+) Equity-Based Compensation Expense 259,983 52,582 37,909 31,434 25,219 8,263 8,270 316,397 (+) Employer Taxes on Employee Stock Transactions 393 1,904 1,167 1,840 1,176 - - 2,297 (+) Secondary Offering Costs - 1,325 - - - - - 1,325 (+) Amortization of Acquired Intangible Assets 275 275 275 315 336 - - 733 (+) Acquisition-Related Costs - - - 243 - - - - Non-GAAP Operating Income / (Loss) 5,480 8,680 (522) 1,592 9,273 (51,022) (22,242) 1,224 GAAP Operating Margin (198%) (36%) (29%) (22%) (11%) (21%) (8%) (65%) Non-GAAP Operating Margin 4% 7% (0%) 1% 6% (18%) (6%) 0%

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ONESTREAM SOFTWARE | ALL RIGHTS RESERVED. 18 Non - GAAP Net Income / (Loss) Reconciliation $000 Q3'24 Q4'24 Q1'25 Q2'25 Q3'25 2022 2023 2024 GAAP Net Loss (249,345) (44,505) (32,651) (24,810) (11,491) (65,466) (28,931) (306,659) (+) Equity-Based Compensation Expense 259,983 52,582 37,909 31,434 25,219 8,263 8,270 316,397 (+) Employer Taxes on Employee Stock Transactions 393 1,904 1,167 1,840 1,176 - - 2,297 (+) Secondary Offering Costs - 1,325 - - - - - 1,325 (+) Amortization of Acquired Intangible Assets 275 275 275 315 336 - - 733 (+) Acquisition-Related Costs - - - 243 - - - - Non-GAAP Net Income / (Loss) 11,306 11,581 6,700 9,022 15,240 (57,203) (20,661) 14,093

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ONESTREAM SOFTWARE | ALL RIGHTS RESERVED. 19 Non - GAAP Net Income per Share Reconciliation Notes: 1. Non - GAAP Net Income per Share may not foot due to rounding. 2. Q3'24 represents net loss per share of Class A common stock and Class D common stock and weighted - average shares of Class A common stock and Class D common stock outstanding for the period following OneStream Inc.'s IPO and related reorganization transactions. $ in actuals Q3'24 Q4'24 Q1'25 Q2'25 Q3'25 Net Loss per Share–basic (1.06) (0.19) (0.14) (0.10) (0.05) (+) Equity-Based Compensation Expense 1.62 0.32 0.22 0.18 0.14 (+) Employer Taxes on Employee Stock Transactions - 0.01 0.01 0.01 0.01 (+) Secondary Offering Costs - 0.01 - - - (+) Amortization of Acquired Intangible Assets - - - - - (+) Acquisition-Related Costs - - - - - (-) Net Loss Attributable to Non-Controlling Interests (0.48) (0.08) (0.05) (0.04) (0.01) Non-GAAP Net Income per Share 0.08 0.07 0.04 0.05 0.08 Weighted-average shares of Class A and Class D common stock outstanding–basic (in 000s) 160,300 165,844 174,729 178,302 186,629

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ONESTREAM SOFTWARE | ALL RIGHTS RESERVED. 20 Free Cash Flow & Free Cash Flow Margin Reconciliation $000, except percentages Q3'24 Q4'24 Q1'25 Q2'25 Q3'25 2022 2023 2024 Total Revenue 129,140 132,475 136,309 147,590 154,303 279,324 374,921 489,407 Net Cash Provided by (Used in) Operating Activities 2,360 25,138 36,197 29,741 4,968 (32,941) 21,265 61,152 (-) Purchases of Property and Equipment (1,077) (441) (380) (366) (178) (4,976) (2,589) (2,618) Free Cash Flow 1,283 24,697 35,817 29,375 4,790 (37,917) 18,676 58,534 Net Cash Provided by (Used in) Operating Activities as a Percentage of Revenue 2% 19% 27% 20% 3% (12%) 6% 12% Free Cash Flow Margin 1% 19% 26% 20% 3% (14%) 5% 12% Net Cash (Used in) Provided by Investing Activities (1,077) (441) (380) (4,066) (178) 34,877 84,750 (10,212) Net Cash Provided by (Used in) Financing Activities 352,978 24,520 13,314 32,539 (2,686) 1,475 (3,845) 376,453

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ONESTREAM SOFTWARE | ALL RIGHTS RESERVED. 21 Billings Reconciliation $000 Q3'24 Q4'24 Q1'25 Q2'25 Q3'25 2022 2023 2024 Total Revenue 129,140 132,475 136,309 147,590 154,303 279,324 374,921 489,407 (+) Deferred revenue, end of period 209,958 243,806 259,789 262,504 282,721 116,373 182,606 243,806 (-) Deferred revenue, beginning of period 196,849 209,958 243,806 259,789 262,504 61,723 116,373 182,606 (-) Unbilled accounts receivable, end of period 25,044 24,094 22,565 22,263 19,179 43,157 33,528 24,094 (+) Unbilled accounts receivable, beginning of period 31,405 25,044 24,094 22,565 22,263 44,528 43,157 33,528 Billings 148,610 167,273 153,821 150,607 177,604 335,345 450,783 560,041

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