Earnings release
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FOR IMMEDIATE ISSUE STAGWELL INC. (NASDAQ: STGW) REPORTS RESULTS FOR THE THREE AND NINE MONTHS ENDED SEPTEMBER 30, 2026 Q3 YoY Revenue Growth of 10% to $816 million; Q3 YoY Net Revenue Growth of 8% to $664 million Q3 YoY Digital Transformation Organic Net Revenue Growth of 23%; Q3 YoY The Marketing Cloud Organic Net Revenue Growth of 108%; Enterprise Technology Products Contracted to Date of $59 million More Than Double Initial 2026 Goal Q3 EPS of $0.07; Q3 Adjusted EPS Growth YoY of 42% to $0.34 Q3 Net Income Attributable to Stagwell Inc. Common Shareholders of $18 million; Q3 Adjusted EBITDA Growth YoY of 25% to $145 million Year-to-Date Net Cash Provided by Operating Activities Increased 396% YoY to $152 million; Year-to- Date Free Cash Flow Increased 227% YoY to $52 million Net New Business of $168 million in Q3; LTM Net New Business of $586 million Largest Multi-Agency Deal in Stagwell History With ServiceNow; Secured First Major Federal Government Win; Expanded Partnership with Palantir Raise Full-Year Adjusted EBITDA Guidance to $490 million to $540 million; Raise Full-Year Adjusted EPS Guidance to $1.07 to $1.21 New York, NY, October 29, 2026 (NASDAQ: STGW) – Stagwell Inc. (“Stagwell”) today announced financial results for the three and nine months ended September 30, 2026. THIRD QUARTER RESULTS: • Q3 Revenue of $816 million, an increase of 10% versus the prior year period; YTD Revenue of $2,306 million, an increase of 10%; • Q3 Revenue increased 11% organically versus the prior year period; YTD Revenue increased 9% organically; • Q3 Net Revenue of $664 million, an increase of 8% versus the prior year period; YTD Net Revenue of $1,880 million, an increase of 6%; • Q3 Net Revenue increased 7% organically versus the prior year period; YTD Net Revenue increased 5% organically; Page 1
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• Q3 Digital Transformation Net Revenue of $119 million, an organic increase of 23% versus the prior year period; • Two-Year Net Revenue Growth Stack for Digital Transformation of 38%, Two-Year Organic Net Revenue Growth Stack for Digital Transformation of 30%; • Q3 The Marketing Cloud Net Revenue of $56 million, an organic increase of 108% versus the prior year period; • YTD enterprise technology products contracted to date of $59 million, more than double initial FY26 target; • Q3 Net Income attributable to Stagwell Inc. Common Shareholders of $18 million versus $25 million in the prior year period; YTD Net Loss attributable to Stagwell Inc. Common Shareholders of $3 million versus income of $16 million in the prior year period; • Q3 Adjusted EBITDA of $145 million, an increase of 25% versus the prior year period; YTD Adjusted EBITDA of $343 million an increase of 17%; • Q3 Adjusted EBITDA Margin of 22% on net revenue; YTD Adjusted EBITDA Margin of 18%; • Q3 Earnings Per Share attributable to Stagwell Inc. Common Shareholders of $0.07 versus $0.09; YTD Loss Per Share attributable to Stagwell Inc. Common Shareholders of $(0.01) versus Earnings Per Share of $0.04 in the prior year period; • Q3 Adjusted Earnings Per Share attributable to Stagwell Inc. Common Shareholders of $0.34 versus $0.24; YTD Adjusted Earnings Per Share attributable to Stagwell Inc. Common Shareholders of $0.77 versus $0.54 in the prior year period; • YTD Net Cash provided by Operating Activities of $152 million versus $31 million in the prior year period; • Net new business of $168 million in the third quarter, last twelve-month net new business of $586 million See “Non-GAAP Financial Measures” below for explanations and reconciliations of the Company’s non-GAAP financial measures. “This is the biggest quarter in Stagwell’s history. It shows we are on track to become number one in marketing transformation,” said Mark Penn, Chairman and CEO of Stagwell. “Software products, like our agentic Stagwell Machines, and the Digital Transformation segment are driving our business as we pivot from primarily marketing services to AI-powered marketing transformation. We have more than doubled our initial Enterprise Technology Bookings goal for the year, saw 23% organic net revenue growth in Digital Transformation, and 108% organic growth in The Marketing Cloud." Ryan Greene, Chief Financial Officer, added: “The third quarter was Stagwell’s largest ever on virtually every metric. Organic net revenue for the company grew more than 7% year-over-year to $664 million, while our adjusted EBITDA grew 25% to $145 million, and our adjusted EPS grew 42% to $0.34. These improved earnings also contributed to a more than 400% increase in operating cash flow year to date. Net leverage now stands at 2.7x, a 0.7x improvement year-over-year, and our lowest ever third quarter ratio. Results through the first three quarters give us the confidence to raise our adjusted EBITDA and adjusted EPS guidance today.” Financial Outlook 2026 financial guidance is updated as follows: • Raise Adjusted EBITDA to $490 million to $540 million Page 2
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• Raise Adjusted EPS to $1.07 - $1.21 • Reiterate Total Net Revenue growth of 8% to 12% • Reiterate Free Cash Flow Conversion of 50% to 60% • Guidance includes anticipated impact from acquisitions or dispositions. * The Company has excluded a quantitative reconciliation with respect to the Company’s 2026 guidance under the “unreasonable efforts” exceptionin Item 10(e)(1)(i)(B) of Regulation S-K. See "Non-GAAP Financial Measures" below for additional information. Video Webcast Management will host a video webcast on Thursday, October 29, 2026, at 8:30 a.m. (ET) to discuss results for Stagwell Inc. for the three and nine months ended September 30, 2026. The video webcast will be accessible at https://edge.media- server.com/mmc/p/qudoyxam/. An investor presentation has been posted on our website at www.stagwellglobal.com and may be referred to during the webcast. A recording of the webcast will be accessible one hour after the webcast and available for ninety days at www.stagwellglobal.com. Stagwell Inc. Stagwell is the global challenger network transforming marketing through AI. We deliver scaled creative performance for the world's most ambitious brands, connecting culture-moving creativity with leading-edge technology to harmonize the art and science of marketing. Led by entrepreneurs, our specialists in 40+ countries are unified under a single purpose: to drive effectiveness and improve business results for our clients. Join us at www.stagwellglobal.com. Contacts For Investors: Ben Allanson IR@stagwellglobal.com For Press: Lena Petersen PR@stagwellglobal.com Non-GAAP Financial Measures In addition to its reported results, Stagwell Inc. has included in this earnings release certain financial results that the Securities and Exchange Commission (“SEC”) defines as “non-GAAP Financial Measures.” Management believes that such non-GAAP financial measures, when read in conjunction with the Company's reported results, can provide useful supplemental information for investors analyzing period to period comparisons of the Company's results. Such non-GAAP financial measures include the following: (1) Organic Net Revenue: “Organic net revenue growth (decline)” reflects the year-over-year change in the Company’s reported net revenue attributable to the Company’s management of the entities it owns. We calculate organic net revenue growth (decline) by subtracting the net impact of acquisitions (divestitures) and the impact of foreign currency exchange fluctuations from the aggregate year-over-year increase or decrease in the Company’s reported net revenue. The net impact of acquisitions (divestitures) reflects the year-over-year change in the Page 3
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Company’s reported net revenue attributable to the impact of all individual entities that were acquired or divested in the current and prior year. We calculate the impact of an acquisition as follows: (a) for an entity acquired during the current year, we present the entity’s current period reported revenue as the impact of the acquisition in the current year; and (b) for an entity acquired in the prior year, we present an amount equal to the entity’s current year net revenue for the same period during which we didn’t own the entity in the prior year as the impact of the acquisition in the current year. We calculate the impact of a divestiture as follows: (a) for a divestiture in the current year, we present the entity’s prior year net revenue for the same period during which we no longer owned it in the current year as impact of the divestiture in the current year; and (b) for a divestiture in the prior year, we present the entity’s prior year net revenue for the period during which we owned it in the prior year as impact of the divestiture in the current year. We calculate the impact of any acquisition or divestiture without adjusting for foreign currency exchange fluctuations. The impact of foreign currency exchange fluctuations reflects the year-over-year change in the Company’s reported net revenue attributable to changes in foreign currency exchange rates. We calculate the impact of foreign currency exchange fluctuations for the portion of the reporting period in which we recognized revenue from a foreign entity in both the current year and the prior year. The impact is calculated as the difference between (1) reported prior period net revenue (converted to U.S. dollars at historical foreign currency exchange rates) and (2) prior period net revenue converted to U.S. dollars at current period foreign exchange rates. (2) Net New Business: Estimate of annualized revenue for new wins less annualized revenue for losses incurred in the period. (3) Adjusted EBITDA: is defined as Net income (loss) attributable to Stagwell Inc. common shareholders excluding non- operating income or expense, income tax expense or benefit, equity in income or loss of non-consolidated entities and net income or loss attributable to noncontrolling and redeemable noncontrolling interest holders to achieve Operating income (loss), plus depreciation and amortization, stock-based compensation, deferred acquisition consideration adjustments, impairment and other losses, and other items. Other items primarily include restructuring, certain system implementation costs, working capital administrative fees, acquisition-related expenses, and other non-recurring income and expenses. Adjusted EBITDA for our reportable segments is reconciled to Operating income (loss), as Net income (loss) is not relevant for a reportable segment financial metric. (4) Adjusted Diluted EPS: is defined as Adjusted Net Income (loss) attributable to Stagwell Inc. common and Class C shareholders, divided by the diluted weighted average shares outstanding. Adjusted Net Income represents net income (loss) attributable to Stagwell Inc. common and Class C shareholders, excluding amortization, impairment and other losses, stock- based compensation, deferred acquisition consideration adjustments, discrete tax items, and other items (as defined above), allocated between the two share classes based on their respective income allocation percentages using a normalized effective tax rate. The diluted weighted average shares outstanding includes the diluted weighted average common shares outstanding plus Class C common stock, par value $0.00001 per share (the “Class C Common Stock”) as if converted to shares of Class A Common Stock if not included because they were anti-dilutive. (5) Free Cash Flow: defined as consolidated net cash flow from operations less cash outflow from capital expenditures and capitalized software, excluding material nonrecurring capital purchases. Free Cash Flow Conversion is the percentage of adjusted EBITDA. Included in this earnings release are tables reconciling reported Stagwell Inc. results to arrive at certain of these non-GAAP financial measures. Page 4
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This document contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”), and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). The Company’s representatives may also make forward- looking statements orally or in writing from time to time. Statements in this document that are not historical facts, including, statements about the Company’s beliefs and expectations, future financial performance, growth, and future prospects, the Company’s strategy, business and economic trends and growth, technological leadership and differentiation, potential and completed acquisitions, anticipated and actual operating efficiencies and synergies and estimates of amounts for redeemable noncontrolling interests and deferred acquisition consideration, constitute forward-looking statements. Forward-looking statements, which are generally denoted by words such as “ability,” “aim,” “anticipate,” “assume,” “believe,” “better,” “build,” “consider,” “continue,” “could,” “depend,” “develop, “drive,” “enhance,” “estimate,” “evaluate,” “expand,” “expect,” “focus,” “forecast,” “future,” “grow,” “guidance,” “illustrative,” “improve,” “intend,” “likely,” “maintain,” “may,” “objective,” “ongoing,” “opportunity,” “optimize,” “outlook,” “plan,” “position,” “possible,” “potential,” “probable,” “project,” “realize,” “remain,” “scenario,” “seek,” “should,” “strategy,” “sufficient,” “support,” “target,” “will,” “would” or the negative of such terms or other variations thereof and terms of similar substance used in connection with any discussion of current plans, estimates and projections are subject to change based on a number of factors, including those outlined in this section. Forward-looking statements in this document are based on certain key expectations and assumptions made by the Company. Although the management of the Company believes that the expectations and assumptions on which such forward-looking statements are based are reasonable, undue reliance should not be placed on the forward-looking statements because the Company can give no assurance that they will prove to be correct. The material assumptions upon which such forward-looking statements are based include, among others, assumptions with respect to general business, economic and market conditions, the competitive environment, anticipated and unanticipated tax consequences and anticipated and unanticipated costs. These forward-looking statements are based on current plans, estimates and projections, and are subject to change based on a number of factors, including those outlined in this section. These forward-looking statements are subject to various risks and uncertainties, many of which are outside the Company’s control. Therefore, you should not place undue reliance on such statements. Forward-looking statements speak only as of the date they are made, and the Company undertakes no obligation to update publicly any of them in light of new information or future events, if any. Forward-looking statements involve inherent risks and uncertainties. A number of important factors could cause actual results to differ materially from those contained in any forward-looking statements. Such risk factors include, but are not limited to, the following: • risks associated with international, national and regional unfavorable economic conditions, including the effect of changing tariffs and other trade policies, inflation and other macroeconomic factors that could affect the Company or its clients; • demand for the Company’s services, which may precipitate or exacerbate other risks and uncertainties; • inflation and actions taken by central banks to address inflation, including changes in interest rates; • the Company’s ability to attract new clients and retain existing clients; • the impact of a reduction in client spending and changes in client advertising, marketing and corporate communications requirements; • financial failure of the Company’s clients; • the Company’s ability to retain and attract key employees; • the Company’s ability to compete in the markets in which it operates; • the Company’s ability to achieve its cost saving initiatives; • the Company’s implementation of strategic initiatives; • the Company’s ability to remain in compliance with its debt agreements, and the Company’s ability to finance its contingent payment obligations when due and payable, including but not limited to those relating to redeemable noncontrolling interests, deferred acquisition consideration and profit interests; • the Company’s ability to manage its growth effectively; • the Company’s ability to identify and complete acquisitions or other strategic transactions that complement and expand the Company’s business capabilities and successfully integrate newly acquired businesses into the Company’s operations, retain key employees, and realize cost savings, synergies and other related anticipated benefits within the expected time period; • the Company’s ability to identify and complete divestitures and to achieve the anticipated benefits therefrom; • the Company’s ability to develop products incorporating new technologies, including augmented reality, artificial intelligence, and virtual reality, and realize benefits from such products; • the Company’s use of artificial intelligence, including generative artificial intelligence, and its ability to realize anticipated efficiencies and other benefits from its investments in artificial intelligence and automation technologies, and changes in client demand for artificial intelligence-related services; • adverse tax consequences for the Company, its operations and its stockholders, that may differ from the expectations of the Company, including that recent or future changes in tax laws, potential changes to corporate tax rates in the Page 5
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United States and disagreements with tax authorities on the Company’s determinations that may result in increased tax costs; • adverse tax consequences in connection with the business combination that formed the Company in August 2021, including the incurrence of material Canadian federal income tax (including material “emigration tax”); • the Company’s ability to maintain an effective system of internal control over financial reporting, including the risk that the Company’s internal controls will fail to detect misstatements in its financial statements, such as errors requiring out-of-period adjustments; • the Company’s ability to accurately forecast its future financial performance and provide accurate guidance; • the Company’s ability to protect client data from security incidents or cyberattacks; • economic disruptions resulting from war and other economic and geopolitical tensions (such as the ongoing military conflicts in Iran and the Middle East, and between Russia and Ukraine), terrorist activities, natural disasters, public health events, and tariff and trade policies, including the resulting effects on client marketing spend in affected regions; • stock price volatility; and • foreign currency fluctuations. Investors should carefully consider these risks and the additional risk factors described in more detail in our Annual Report on Form 10-K for the year ended December 31, 2025 (the “2025 Form 10-K”), filed with the Securities and Exchange Commission (the “SEC”) on March 13, 2026, and accessible on the SEC’s website at www.sec.gov, under the caption “Risk Factors,” in our subsequent QuarterlyReports on Form 10-Q and in the Company’s other SEC filings. Page 6
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SCHEDULE 1 STAGWELL INC. AND SUBSIDIARIES UNAUDITED CONSOLIDATED STATEMENTS OF OPERATIONS (amounts in thousands, except per share amounts) Three Months EndedSeptember 30, Nine Months EndedSeptember 30, 2026 2025 2026 2025 Revenue $ 816,027 $ 742,998 $ 2,306,477 $ 2,101,556 Operating expenses Cost of services 511,698 470,937 1,488,293 1,342,240 Office and general expenses 206,942 166,422 611,323 528,845 Depreciation and amortization 48,300 44,260 136,395 127,635 Impairment and other losses 1,028 466 1,219 466 767,968 682,085 2,237,230 1,999,186 Operating Income 48,059 60,913 69,247 102,370 Other income (expenses): Interest expense, net (23,993) (25,196) (69,587) (72,007) Foreign exchange, net 2,244 (366) (172) (484) Other, net 2,526 (2,032) 3,394 (2,143) (19,223) (27,594) (66,365) (74,634) Income before income taxes and equity in earnings of non-consolidatedaffiliates 28,836 33,319 2,882 27,736 Income tax expense 10,882 9,555 7,646 13,950 Income (loss) before equity in earnings of non-consolidated affiliates 17,954 23,764 (4,764) 13,786 Equity in income (loss) of non-consolidated affiliates 442 (1) 512 18 Net income (loss) 18,396 23,763 (4,252) 13,804 Net (income) loss attributable to noncontrolling and redeemablenoncontrolling interests (277) 856 1,282 2,637 Net income (loss) attributable to Stagwell Inc. common shareholders $ 18,119 $ 24,619 $ (2,970) $ 16,441 Earnings (loss) per common share: Basic $ 0.07 $ 0.10 $ (0.01) $ 0.08 Diluted $ 0.07 $ 0.09 $ (0.01) $ 0.04 Weighted average number of common shares outstanding: Basic 244,666 255,952 247,131 210,139 Diluted 250,989 259,583 247,131 266,773 Page 7
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SCHEDULE 2 STAGWELL INC. UNAUDITED COMPONENTS OF NET REVENUE CHANGE (amounts in thousands) Net Revenue - Components of Change Change ThreeMonthsEndedSeptember30, 2025 ForeignCurrency NetAcquisitions(Divestitures) Organic TotalChange ThreeMonthsEndedSeptember30, 2026 Organic Total MarketingServices $ 239,961 $ (176) $ (3,996) $ (18,108) $ (22,280) $ 217,681 (7.5)% (9.3)% DigitalTransformation 96,111 (233) 599 22,182 22,548 118,659 23.1 % 23.5 % Media &Commerce 162,542 (432) — (3,366) (3,798) 158,744 (2.1)% (2.3)% Communications 96,631 72 7,657 19,324 27,053 123,684 20.0 % 28.0 % The MarketingCloud 26,571 304 — 28,808 29,112 55,683 108.4 % 109.6 % Corporate,eliminations andother (7,294) 12 — (3,152) (3,140) (10,434) 43.2 % 43.0 % $ 614,522 $ (453) $ 4,260 $ 45,688 $ 49,495 $ 664,017 7.4 % 8.1 % Non-GAAP Financial Measures section above for the definition of Organic Net Revenue. (1) Page 8
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SCHEDULE 3 STAGWELL INC. AND SUBSIDIARIES UNAUDITED COMPONENTS OF NET REVENUE CHANGE (amounts in thousands) Net Revenue - Components of Change Change Nine MonthsEndedSeptember30, 2025 ForeignCurrency NetAcquisitions(Divestitures) Organic TotalChange Nine MonthsEndedSeptember30, 2026 Organic Total MarketingServices $ 692,760 $ 3,086 $ (7,740) $ (15,436) $ (20,090) $ 672,670 (2.2)% (2.9)% DigitalTransformation 277,091 (617) 3,826 45,734 48,943 326,034 16.5 % 17.7 % Media &Commerce 459,911 1,855 4,185 (191) 5,849 465,760 — % 1.3 % Communications 285,447 1,041 10,271 36,114 47,426 332,873 12.7 % 16.6 % The MarketingCloud 77,364 2,863 — 30,576 33,439 110,803 39.5 % 43.2 % Corporate,eliminations andother (15,735) (8) — (12,173) (12,181) (27,916) 77.4 % 77.4 % $ 1,776,838 $ 8,220 $ 10,542 $ 84,624 $ 103,386 $ 1,880,224 4.8 % 5.8 % See Non-GAAP Financial Measures section above for the definition of Organic Net Revenue. (1) (1) Page 9
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SCHEDULE 4 STAGWELL INC. UNAUDITED SEGMENT OPERATING RESULTS (amounts in thousands) For the Three Months Ended September 30, 2026 MarketingServices DigitalTransformation Media &Commerce Communications TheMarketingCloud Corporate,Eliminationand Other Total Revenue $ 255,445 $ 127,176 $ 176,857 $ 210,913 $ 55,825 $ (10,189) $ 816,027 Billable costs 37,764 8,517 18,113 87,229 142 245 152,010 Net revenue 217,681 118,659 158,744 123,684 55,683 (10,434) 664,017 Staff costs 126,795 73,620 95,403 59,939 16,572 13,288 385,617 Administrativecosts 24,677 6,830 26,650 13,432 5,291 5,878 82,758 Unbillable andother costs, net 24,254 71 16,917 2,455 9,165 (2,056) 50,806 AdjustedEBITDA 41,955 38,138 19,774 47,858 24,655 (27,544) 144,836 Stock-basedcompensation 11,717 3,675 1,230 4,221 400 7,677 28,920 Depreciationand amortization 11,841 6,256 8,601 6,925 5,995 8,682 48,300 Deferredacquisitionconsideration — 3,433 1,216 3,013 13 — 7,675 Impairment andother losses — — — — 1,028 — 1,028 Other items, net 3,161 318 3,712 701 986 1,976 10,854 Operating income(loss) $ 15,236 $ 24,456 $ 5,015 $ 32,998 $ 16,233 $ (45,879) $ 48,059 See Non-GAAP Financial Measures section above for the definition of Adjusted EBITDA and Other items, net. (1) (1) (1) Page 10
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SCHEDULE 5 STAGWELL INC. AND SUBSIDIARIES UNAUDITED SEGMENT OPERATING RESULTS (amounts in thousands) For the Nine Months Ended September 30, 2026 MarketingServices DigitalTransformation Media &Commerce Communications TheMarketingCloud Corporate,eliminationsand other Total Revenue $ 786,650 $ 349,756 $ 534,561 $ 552,767 $ 110,963 $ (28,220) $ 2,306,477 Billable costs 113,980 23,722 68,801 219,894 160 (304) 426,253 Net revenue 672,670 326,034 465,760 332,873 110,803 (27,916) 1,880,224 Staff costs 390,338 208,901 291,338 178,086 51,460 30,062 1,150,185 Administrativecosts 74,036 20,966 74,902 40,634 18,003 10,932 239,473 Unbillable andother costs, net 75,327 381 45,820 6,291 23,962 (4,423) 147,358 AdjustedEBITDA 132,969 95,786 53,700 107,862 17,378 (64,487) 343,208 Stock-basedcompensation 24,649 8,368 2,871 9,131 906 15,810 61,735 Depreciationand amortization 36,749 18,011 24,319 19,972 18,945 18,399 136,395 Deferredacquisitionconsideration (1,969) 13,535 9,854 4,773 573 — 26,766 Impairment andother losses — — 191 — 1,028 — 1,219 Other items, net 9,085 1,938 11,692 4,205 1,686 19,240 47,846 Operating income(loss) $ 64,455 $ 53,934 $ 4,773 $ 69,781 $ (5,760) $ (117,936) $ 69,247 See Non-GAAP Financial Measures section above for the definition of Adjusted EBITDA and Other items, net. (1) (1) (1) Page 11
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SCHEDULE 6 STAGWELL INC. AND SUBSIDIARIES UNAUDITED SEGMENT OPERATING RESULTS (amounts in thousands) For the Three Months Ended September 30, 2025 MarketingServices DigitalTransformation Media &Commerce Communications TheMarketingCloud Corporate,eliminationsand other Total Revenue $ 291,089 $ 104,445 $ 183,112 $ 145,086 $ 26,576 $ (7,310) $ 742,998 Billable costs 51,128 8,334 20,570 48,455 5 (16) 128,476 Net revenue 239,961 96,111 162,542 96,631 26,571 (7,294) 614,522 Staff costs 138,310 62,845 98,212 56,650 17,969 13,224 387,210 Administrativecosts 26,835 6,981 24,225 12,516 3,068 (3,238) 70,387 Unbillable andother costs, net 17,187 401 15,554 2,344 6,898 (1,446) 40,938 Adjusted EBITDA 57,629 25,884 24,551 25,121 (1,364) (15,834) 115,987 Stock-basedcompensation 4,240 934 1,111 1,594 200 4,567 12,646 Depreciation andamortization 12,820 5,932 7,524 6,363 6,455 5,166 44,260 Deferredacquisitionconsideration (500) 1,874 1,413 (3,716) (12,419) — (13,348) Impairment andother losses — — — 222 244 — 466 Other items, net 2,200 432 4,153 1,624 1,284 1,357 11,050 Operating income(loss) $ 38,869 $ 16,712 $ 10,350 $ 19,034 $ 2,872 $ (26,924) $ 60,913 See Non-GAAP Financial Measures section above for the definition of Adjusted EBITDA and Other items. (1) (1) (1) Page 12
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SCHEDULE 7 STAGWELL INC. UNAUDITED SEGMENT OPERATING RESULTS (amounts in thousands) For the Nine Months Ended September 30, 2025 MarketingServices DigitalTransformation Media &Commerce Communications TheMarketingCloud Corporate,Eliminationand Other Total Revenue $ 817,294 $ 294,301 $ 509,416 $ 420,556 $ 77,380 $ (17,391) $2,101,556 Billable costs 124,534 17,210 49,505 135,109 16 (1,656) 324,718 Net Revenue 692,760 277,091 459,911 285,447 77,364 (15,735) 1,776,838 Staff costs 401,036 186,972 291,228 172,273 52,001 33,232 1,136,742 Administrativecosts 83,338 19,599 70,963 37,042 11,582 (4,301) 218,223 Unbillable andother costs, net 61,801 1,178 44,486 7,103 18,399 (3,665) 129,302 Adjusted EBITDA 146,585 69,342 53,234 69,029 (4,618) (41,001) 292,571 Stock-basedcompensation 14,832 3,081 3,302 6,760 541 15,627 44,143 Depreciation andamortization 39,556 17,250 22,211 19,349 17,436 11,833 127,635 Deferredacquisitionconsideration (4,784) 7,729 2,942 (4,879) (10,919) — (9,911) Impairment andother losses — — — 222 244 — 466 Other items, net 3,133 1,493 11,210 3,686 2,609 5,737 27,868 Operating income(loss) $ 93,848 $ 39,789 $ 13,569 $ 43,891 $ (14,529) $ (74,198) $ 102,370 See Non-GAAP Financial Measures section above for the definition of Adjusted EBITDA and Other items, net. (1) (1) (1) Page 13
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SCHEDULE 8 STAGWELL INC. UNAUDITED RECONCILIATION OF ADJUSTED DILUTED EARNINGS PER SHARE (NON-GAAP MEASURE) (amounts in thousands, except per share amounts) For the Three Months Ended September 30, 2026 GAAP Adjustments Non-GAAP Net income attributable to Stagwell Inc. common shareholders $ 18,119 $ 67,859 $ 85,978 Diluted - Weighted average number of shares outstanding 250,989 — 250,989 Diluted EPS and Adjusted Diluted EPS $ 0.07 $ 0.34 Adjustments to Net income Amortization $ 42,884 Impairment and other losses 1,028 Stock-based compensation 28,920 Deferred acquisition consideration 7,675 Other items, net 7,409 87,916 Adjustment to GAAP income tax expense (20,057) $ 67,859 See Non-GAAP Financial Measures section above for the definition of Adjusted Diluted EPS. Other items, net, primarily includes restructuring, certain system implementation costs, working capital administrative fees, acquisition-related expense, and other non- recurring expenses. Represents the difference between the income tax expense of $10.9 million at an effective tax rate of 37.7% on a GAAP basis and the income tax expense of $30.9 million at an effective tax rate of 26.5% on a non-GAAP basis. The difference reflects the tax impact of non-GAAP adjustments. (1) (1) (2) (3) (1) (2) (3) Page 14
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SCHEDULE 9 STAGWELL INC. AND SUBSIDIARIES UNAUDITED RECONCILIATION OF ADJUSTED DILUTED EARNINGS PER SHARE (NON-GAAP MEASURE) (amounts in thousands, except per share amounts) For the Nine Months Ended September 30, 2026 GAAP Adjustments Non-GAAP Net (loss) income attributable to Stagwell Inc. common shareholders $ (2,970) $ 193,633 $ 190,663 Diluted - Weighted average number of common shares outstanding 247,131 — 247,131 Diluted EPS and Adjusted Diluted EPS $ (0.01) $ 0.77 Adjustments to Net (loss) income Amortization $ 119,962 Impairment and other losses 1,219 Stock-based compensation 61,735 Deferred acquisition consideration 26,766 Other items, net 44,401 254,083 Adjustment to GAAP income tax expense (60,450) $ 193,633 See Non-GAAP Financial Measures section above for the definition of Adjusted Diluted EPS. Other items, net, primarily includes restructuring, certain system implementation costs, working capital administrative fees, acquisition-related expense, and other non- recurring expenses. Represents the difference between the income tax expense of $7.6 million at an effective tax rate of 265.3% on a GAAP basis and the income tax expense of $68.1 million at an effective tax rate of 26.5% on a non-GAAP basis. The difference reflects the tax impact of non-GAAP adjustments. (1) (1) (2) (3) (1) (2) (3) Page 15
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SCHEDULE 10 STAGWELL INC. UNAUDITED RECONCILIATION OF ADJUSTED DILUTED EARNINGS PER SHARE (NON-GAAP MEASURE) (amounts in thousands, except per share amounts) For the Three Months Ended September 30, 2025 GAAP Adjustments Non-GAAP Net income attributable to Stagwell Inc. common shareholders $ 24,619 $ 38,575 $ 63,194 Diluted - Weighted average number of common shares outstanding 259,583 — 259,583 Diluted EPS and Adjusted Diluted EPS $ 0.09 $ 0.24 Adjustments to Net income Amortization $ 38,707 Impairment and other losses 466 Stock-based compensation 12,646 Deferred acquisition consideration (13,348) Other items, net 13,333 51,804 Adjustment to GAAP income tax expense (13,229) 38,575 See Non-GAAP Financial Measures section above for the definition of Adjusted Diluted EPS. Other items, net, primarily includes restructuring, certain system implementation costs, working capital administrative fees, acquisition-related expense, and other non- recurring expenses. Represents the difference between the income tax expense of $9.6 million at an effective tax rate of 28.7% on a GAAP basis and the income tax expense of $22.8 million at an effective tax rate of 26.5% on a non-GAAP basis. The difference reflects the tax impact of non-GAAP adjustments. (1) (1) (2) (3) (1) (2) (3) Page 16
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SCHEDULE 11 STAGWELL INC. AND SUBSIDIARIES UNAUDITED RECONCILIATION OF ADJUSTED DILUTED EARNINGS PER SHARE (NON-GAAP MEASURE) (amounts in thousands, except per share amounts) For the Nine Months Ended September 30, 2025 GAAP Adjustments Non-GAAP Net income attributable to Stagwell Inc. common shareholders $ 16,441 $ 134,175 $ 150,616 Net loss attributable to Class C shareholders (6,637) — (6,637) Net income attributable to Stagwell Inc. and Class C shareholders andadjusted net income $ 9,804 $ 134,175 $ 143,979 Diluted - Weighted average number of common shares outstanding 214,557 — 214,557 Weighted average number of shares of Class C Common Stock outstanding 52,216 — 52,216 Diluted - Weighted average number of shares outstanding 266,773 — 266,773 Diluted EPS and Adjusted Diluted EPS $ 0.04 $ 0.54 Adjustments to Net income Amortization $ 107,281 Impairment and other losses 466 Stock-based compensation 44,143 Deferred acquisition consideration (9,911) Other items, net 30,151 172,130 Adjustment to GAAP income tax expense (37,955) $ 134,175 See Non-GAAP Financial Measures section above for the definition of Adjusted Diluted EPS. Other items, net, primarily includes restructuring, certain system implementation costs, working capital administrative fees, acquisition-related expense, and other non- recurring expenses. Represents the difference between the income tax expense of $14.0 million at an effective tax rate of 50.3% on a GAAP basis and the income tax expense of $51.9 million at an effective tax rate of 26.5% on a non-GAAP basis. The difference reflects the tax impact of non-GAAP adjustments. (1) (1) (2) (3) (1) (2) (3) Page 17
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SCHEDULE 12 STAGWELL INC. AND SUBSIDIARIES UNAUDITED CONSOLIDATED BALANCE SHEETS (amounts in thousands) September 30, 2026 December 31, 2025 ASSETS Current Assets Cash and cash equivalents $ 132,197 $ 104,537 Accounts receivable, net 772,787 735,752 Expenditures billable to clients 144,015 164,694 Other current assets 174,932 157,309 Total Current Assets 1,223,931 1,162,292 Fixed assets, net 70,083 73,081 Right-of-use assets - operating leases 189,243 213,576 Goodwill 1,598,491 1,595,238 Other intangible assets, net 795,689 834,248 Deferred tax assets 280,193 281,057 Other assets 53,812 55,055 Total Assets $ 4,211,442 $ 4,214,547 LIABILITIES, REDEEMABLE NONCONTROLLING INTERESTS ("RNCI"), ANDSHAREHOLDERS’ EQUITY Current Liabilities Accounts payable $ 489,376 $ 548,320 Accrued media 228,612 239,490 Accruals and other liabilities 330,142 291,554 Advance billings 365,529 329,815 Current portion of lease liabilities - operating leases 55,073 55,386 Current portion of deferred acquisition consideration 42,871 15,446 Total Current Liabilities 1,511,603 1,480,011 Long-term debt 1,414,574 1,326,013 Long-term portion of deferred acquisition consideration 21,494 24,598 Long-term lease liabilities - operating leases 195,482 224,397 Deferred tax liabilities 53,899 54,726 Long-term tax receivable agreement liability 252,390 252,390 Other liabilities 30,456 51,077 Total Liabilities 3,479,898 3,413,212 Redeemable Noncontrolling Interests 21,247 24,968 Commitments, contingencies and guarantees Shareholders' Equity Common shares - Class A 245 252 Paid-in capital 697,402 744,463 Retained earnings 31,203 32,930 Accumulated other comprehensive loss (34,787) (19,252) Stagwell Inc. Shareholders' Equity 694,063 758,393 Noncontrolling interests 16,234 17,974 Total Shareholders' Equity 710,297 776,367 Total liabilities, RNCI, and shareholders’ equity $ 4,211,442 $ 4,214,547 Page 18
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SCHEDULE 13 STAGWELL INC. AND SUBSIDIARIES UNAUDITED SUMMARY CASH FLOW DATA (amounts in thousands) Nine Months Ended September 30, 2026 2025 Cash flows from operating activities: Net (loss) income $ (4,252)$ 13,804 Adjustments to reconcile net loss to cash provided by operating activities: Stock-based compensation 61,735 44,143 Depreciation and amortization 136,395 127,635 Amortization of right-of-use lease assets and lease liability interest 47,471 51,208 Impairment and other (gains) losses (2,226) (3,063) Deferred income taxes 476 3,216 Adjustment to deferred acquisition consideration 26,766 (9,911) Other, net 2,280 1,319 Changes in working capital: Accounts receivable (51,575) (3,477) Expenditures billable to clients 20,723 26,266 Other current assets (22,408) (53,377) Accounts payable (50,059) (57,306) Accrued expenses and other liabilities 5,297 (117,118) Advance billings 35,360 67,964 Current portion of lease liabilities - operating leases (52,254) (59,414) Deferred acquisition related payments (1,450) (1,176) Net cash provided by operating activities 152,279 30,713 Cash flows from investing activities: Capitalized software (75,855) (45,315) Capital expenditures (27,405) (26,338) Acquisitions, net of cash acquired (6,347) (6,179) Other (4,303) (2,927) Net cash used in investing activities (113,910) (80,759) Cash flows from financing activities: Repayment of borrowings under revolving credit facility (1,533,426) (1,412,000) Proceeds from borrowings under revolving credit facility 1,619,780 1,586,326 Shares repurchased and cancelled (90,716) (105,183) Distributions to noncontrolling interests and RNCI (3,903) (5,018) Payment of deferred consideration (337) (16,103) Purchase of noncontrolling interest (450) — Tax Receivables Agreement payment (2,554) — Debt financing and other costs — (3,795) Net cash (used in) provided by financing activities (11,606) 44,227 Effect of exchange rate changes on cash and cash equivalents 897 6,718 Net increase in cash and cash equivalents 27,660 899 Cash and cash equivalents at beginning of period 104,537 131,339 Cash and cash equivalents at end of period $ 132,197 $ 132,238 Page 19