#1STAGWELL TRANSFORMING MARKETING Investor Presentation OCTOBER | 2023#2DISCLAIMER 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 that could affect the Company or its clients; the continued impact of the coronavirus pandemic ("COVID-19"), and evolving strains of COVID-19 on the economy and demand for the Company's services, which may precipitate or exacerbate other risks and uncertainties; inflation and actions taken by central banks to counter inflation; 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 and deferred acquisition consideration; the Company's ability to manage its growth effectively, including the successful completion and integration of acquisitions that complement and expand the Company's business capabilities; the Company's ability to develop products incorporating new technologies, including augmented reality, artificial intelligence, and virtual reality, and realize benefits from such products; an inability to realize expected benefits of the combination of the Company's business with the business of MDC Partners Inc. ("MDC"); adverse tax consequences in connection with the combination of MDC and Stagwell Marketing Group LLC and its direct and indirect subsidiaries (the "Transactions") for the Company, its operations and its shareholders, that may differ from the expectations of the Company, including that future changes in tax law, potential increases to corporate tax rates in the United States and disagreements with the tax authorities on the Company's determination of value and computations of its attributes may result in increased tax costs; the occurrence of material Canadian federal income tax (including material "emigration tax") as a result of the Transactions; the Company's unremediated material weaknesses in internal control over financial reporting and its ability to establish and maintain an effective system of internal control over financial reporting; the Company's ability to protect client data from security incidents or cyberattacks; economic disruptions resulting from war and other geopolitical tensions (such as the ongoing military conflict between Russia and Ukraine), terrorist activities and natural disasters; stock price volatility; and foreign currency fluctuations. Investors should carefully consider these risk factors and the additional risk factors outlined in more detail in the Company's filings with the SEC, including the Company's Annual Report on Form 10-K for the year ended December 31, 2022. 2#3DISCLAIMER Forward-Looking Statements This presentation 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 that are not historical facts, including, but not limited to, statements about the Company's beliefs and expectations, future financial performance, growth targets, market opportunity and future prospects, business and economic trends, potential acquisitions, 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 "anticipate," "assume," "believe," "continue," "could," "create," "estimate," "expect," "focus," "forecast," "foresee," "future," "guidance," "intend," "look," "may," "opportunity," "outlook," "plan," "possible," "potential," "predict," "project," "should," "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 presentation 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. STAGWELL TRANSFORMING MARKETING 3#4STAGWELL At A Glance INTRODUCTION TO STAG WELL $2.7B FY22 GAAP REVENUE $451M FY22 ADJ. EBITDA 4,000+ BLUE-CHIP CUSTOMERS 57% Digital in FY22 ~$270M FY22 FREE CASH FLOW $1.3T ADDRESSABLE MARKET Mark Penn Chairman & CEO "Stagwell is a holistic, technology-first, enterprise services company owing to its combination of ad agency creative and technology enterprise. We differentiate ourselves in the marketplace through synergistic integration of technology and data with creative ad solutions to drive out-sized market share growth" Note:Employees includes full-time employees and full-time contractors. Figures as of December 31, 2022. See appendix for reconciliations of Non-GAAP financial measures. 4#5STAGWELL Story Founded in late 2015 with a vision for a new digital-first marketing company, Stagwell has grown to become the first Marketing Services company in 40+ years to reach competitive scale STAGWELL GROUP Driven by visionary leadership from Mark Penn, a committed partner in Steve Ballmer, a best-in-class accretive acquisition approach, and renowned capabilities in Creative & Digital services, We are just getting started THE STGW Founded KEY DIGITAL Acquisitions 2015 2017 FROM ZERO to Market Hero 8 KEY CREATIVE ADDITIONS THROUGH MDC Partners STGW Goes Public 2019 2021 $2.7B FY 2022 REVENUE TODAY INTRODUCTION TO STAGWELL 5#6INTRODUCTION TO STAG WELL VISIONARY LEADERSHIP From An Industry Veteran Mark Penn Chairman & CEO A Record of Vision & Accomplishment In 2015, Mark believed that the marketing industry was ripe for disruption, needing a new kind of marketing company FOUNDED an innovative polling company in 1975 SERVED as an advisor to multiple world leaders, including Bill Clinton & Prime Minister Tony Blair TURNED AROUND Burson-Marsteller, a global PR and public affairs firm, tripling profits ADVISED major global companies from Ford to Intel IDENTIFIED Soccer Moms, and wrote two best-selling books (Microtrends) LED strategy and advertising at Microsoft as EVP & Chief Strategy Officer FOUNDED Stagwell with Steve Ballmer Steve Ballmer Former CEO, Microsoft First Investor, Stagwell "I have known Mark for many, many years. At Microsoft, he did some critical work for us, and worked directly for me on some path-breaking advertising and other campaigns. A lot of people make a lot of promises, but Mark is someone who just gets things done, it's just the kind of person that he is." 9#7THE LEGACY ADVERTISING MARKET Is Ripe For Disruption $2.7B WPP $18B OTHERS $27B Stagwell represents only 2% of the global advertising and marketing services market Ample room to continue taking market share IBM iX $7B $10B Deloitte Digital 1 Top 4 legacy holding companies: WPP, Omnicom, Publicis, IPG in 2022 Source; Company filings and AdAge Agency Report 2023 PUBLICIS $15B GROUPE ~$60B spent with the top 4 legacy holding companies¹ $14B $10B $11B Dentsu $16B Accenture IPG Interactive OMG $130B spent on advertising & marketing services with the Top 25 industry providers in 2022 STAG WELL OPPORTUNITY 7#8STAGWELL UNIQUELY POSITIONED To Capture Share As New Markets Emerge & Mature $1.3T TOTAL ADDRESSABLE NEW MARKETS IN 2026 ΑΙ $50B $700B $525B ARTIFICIAL INTELLIGENCE Delivering proprietary Al-enabled tools and services, developed in-house by Stagwell Marketing Cloud, to help marketers increase performance and productivity across their business. DIGITAL TRANSFORMATION Helping brands revolutionize their approach to the customer, by developing transformational experiences and systems, that deliver tangible returns on investment and foster deeper customer relationships. DIGITAL MARKETING SERVICES Gaining market share versus incumbent players driven by a combination of digital-first capabilities, designed to capitalize on changing customer behavior, and award-winning creative agencies. Source: Artificial Intelligence - "Global Artificial Intelligence (AI) in Marketing Market Forecast 2021-2028", Inkwood Research - Assume 26.58% CAGR from 2021-2026 Digital Transformation - "Digital Transformation Market - Global Industry Analysis, Size, Share, Growth, Trends, Regional Outlook, and Forecast 2023-2032", Precedence Research - Assume TAM for STGW represents 20% of Total Size Digital Marketing - "Global Digital Marketing Market Outlook", Expert Market Research - Assume 13.1% CAGR from 2022-2026 STAG WELL OPPORTUNITY 8#9INTEGRATED PLATFORM For The Modern Marketer Stagwell Marketing Cloud Group SaaS and DaaS Tools for the In-House Marketer Digital Transformation Building Digital Platforms & Consumer Experiences 2 Performance Media & Data 3 Integrated Omnichannel Media, Data & E-Commerce Consumer Insights & Strategy Tracking Across the Consumer Journey Creativity & Communications Blue-Chip Customer Base 4 DIGITAL CAPABILITIES 5 STAG WELL TODAY 9#10BLUE-CHIP CUSTOMER BASE Demonstrated Ability To Land & Expand $360M REVENUE FROM TOP 10 CUSTOMERS' Expedia® Apple amazon Microsoft DIAGEO H&R BLOCK novo nordisk ✓ Google BACARDÍ 1 As of May 30, 2023 2 Client relationships over $100K in revenue (representing 95% of revenue), over past two years 3 Year over Year growth of revenue for the LTM period ending May 30, 2023 versus the LTM period ending May 30, 2022 80% CLIENT RETENTION YEAR-OVER-YEAR² 11% 4K+ GROWTH IN AVERAGE RELATIONSHIP TOP 10 CUSTOMERS3 BLUE CHIP CUSTOMERS STAG WELL TODAY 10#11STRATEGIC VALUE-ADDED Investment Platform Unified & engaged corporate team delivering value-added shared services driving both revenue & cost synergies Incentives to collaborate and drive overall network growth THE STAGWELL PLATFORM Global Marketing Media Network Affiliate Reach Client Services $ Central M&A Innovation Group Growth Investment Finance Admin & Operations Shared Services STAG WELL TODAY 11#12STAGWELL'S ACQUISITION STRATEGY Systematically expanding our digital & global footprint STAGWELL GROWTH DRIVERS FOCUS AREAS INCREASING OUR DIGITAL REVENUE MIX 57% 65% Digital Transformation: Platform design, optimization, and analytics with a focus on cloud, Al, and Web3 technologies Digital Media: Leveraging emerging media trends and production capabilities to engage tomorrow's consumer + GROWING OUR REVENUE FROM OUTSIDE OF NORTH AMERICA 20% 40% Increasing our global footprint to win the largest $25M+ global contracts 12#13STAGWELL GROWTH DRIVERS STAGWELL MARKETING CLOUD SaaS & DaaS Tools For The In-House Marketer Building complementary software solutions leveraging the domain expertise and distribution channels already in place at Stagwell DIGITAL SERVICES Digital Transformation Building Digital Platforms & Consumer Experiences Consumer Insights & Strategy Tracking Across the Consumer Journey Creativity & Communications Blue-Chip Customer Base Performance Media & Data Integrated Omnichannel Media, Data & E-Commerce TECHNOLOGY SMC Advanced Media Platforms Proprietary & Premium Owned Media Channels SMC Media Studio Platform for In-House Media Planners & Buyers SMC Real-Time Research Suite of Solutions for Market Researchers SMC Comms Tech Al-Driven Platform for Modern Communicators SMC PRODUCT SPOTLIGHTS ☐ around Augmented Reality Bringing a whole new level of stadium entertainment and fan engagement to sports and entertainment through shared AR Prophet Artificial Intelligence Revolutionizing the PR process through Al, saving PR professionals from millions of tedious working hours + Edit Pitch Tayler Generate Your Pitch MAKE NOISE Persuasive Regenerate Pitch Social Gerard Content You've seed to pit Original Content Indulge in McDonald's USA's Smoky BLT Quarter Pounder and OREO Fudge McFlurry! 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McDonald's USA CMD Matthew Lochner said " 13#14Potential Equation for Success* ($M) ADDING it all up 10-12% long-term organic growth target driven by: 10-20% Digital Transformation 5-15% Performance Media & Data 5-15% Research & Strategy ‣3-7% Creativity & Communications ~$3,500 + Stagwell Marketing Cloud ~$75 OPPORTUNITY TO GROW TO $4 BILLION+ AND BEYOND OF GAAP REVENUE THROUGH COMBINATION OF ORGANIC, NEW REVENUE STREAMS & ACQUISITIONS + M&A Growth = TOTAL *Based on applying long term average growth targets to 2022 revenue $450 $4,000+ STAG WELL FINANCIAL MODEL 14#15PROVEN LEADERSHIP TEAM Primed To Deliver Mark Penn Chairman & CEO FOUNDER & POLLSTER Founded Penn and Schoen in 1975 with his Harvard roommate Doug Schoen GROWER Under Penn's leadership, firm expanded to 200+ people with offices around the world. ADVISOR Served key corporate (Texaco, AT&T, Microsoft, Ford, Merck, etc.) & political (President Clinton's pollster for six years, advisor to Hillary Clinton & Tony Blair) clients SELLER Penn & his partners sold PSB to WPP in November 2001 after growing it from a mom-and-pop political polling firm to $80M+ in revenue GLOBAL CEO Served as CEO of Burson-Marsteller from 2006-2012, running a global PR and public affairs firm with an 80+ market footprint and tripling profits CLIENT & CREATOR Asked by Steve Ballmer to join Microsoft & revitalize Bing in 2012; rose to EVP & Chief Strategy Officer running Microsoft's $2 billion advertising budget PORTFOLIO BUILDER & PUBLIC COMPANY CEO Launched Stagwell Group in 2015; invested in MDC in 2019 & assumed role of Chairman & CEO CORPORATE LEADERSHIP 2 2 2 0 1 0 2 03 Jay Leveton President 22 Yrs Industry Experience 8 Yrs at Stagwell Frank Lanuto CFO 30 Yrs Industry Experience 4 Yrs at Stagwell Jason Reid Beth Sidhu CIO 18 Yrs Industry Experience 8 Yrs at Stagwell Chief Brand & Communications Officer 18 Yrs Industry Experience 8 Yrs at Stagwell Ryan Linder CMO 23 Yrs Industry Experience 5 Yrs at Stagwell Stephanie Howley CPO 14 Yrs Industry Experience 2 Yrs at Stagwell Ryan Greene COO 19 Yrs Industry Experience 8 Yrs at Stagwell Julia Hammond President Stagwell Global 21 Yrs Industry Experience 3 Yrs at Stagwell Ray Day Vice Chair 35 Yrs Industry Experience 4 Yrs at Stagwell BUSINESS LEADERSHIP NARODNE Carl Johnson Kara Place Brad Simms Maggie Malek Anomaly Instrument GALE MMI Justin Lewis Constellation James Townsend Brand Performance. Network David DeMuth Doner Evin Shutt Christine Fruechte Dan Gardner Toby Southgate 72andSunny Colle McVay Code and Theory F&B Krista Webster Veritas STAG WELL LEADERSHIP 15#16STAGWELL IS UNDER-APPRECIATED Stock Price Doesn't Reflect How Stagwell Is Disrupting Marketing Landscape Industry-leading NET REVENUE GROWTH UNDER-VALUED On Virtually All Metrics (P/S, EV/EBITDA, P/E) Note: Among US-listed Ad Agency peers, based on FY22 financials Best-in-Class ADJ. EBITDA MARGIN Efficient CONVERSION OF EBITDA TO FCF Sustainable LEVERAGE POSITION UNDER-APPRECIATED ASSET 16#17STAGWELL TRANSFORMING MARKETING Appendix#18GAAP CONSOLIDATED OPERATING PERFORMANCE $ and Shares in Thousands Revenue Cost of services Office & general expenses Depreciation & amortization Impairment & other losses Total operating expenses Operating income (Loss) Interest expense, net Foreign exchange, net Other, net Other income (expenses) Income tax expense (benefit) Income (loss) before equity in earnings of non-consolidated affiliates Equity in income (loss) of non-consolidated affiliates Net income (loss) Three Months Ended December 31, 2022 2021 $ 708,185 $ 611,927 419,811 172,415 348,000 197,318 35,631 31,381 94,145 Twelve Months Ended December 31, 2022 2021 $ 2,687,792 $1,469,363 1,673,576 601,536 906,856 424,038 131,273 77,503 1,314 122,179 16,240 $ 2,528,564 $1,424,637 $ 159,228 $ 722,002 $ (13,817) (19,510) 1,557 (7,241) $ (25,194) (12,570) $ (26,441) (1,132) $ (27,573) 21,095 $ 578,013 $ 33,914 (16,697) (1,377) 3.252 $ (14,822) 14,193 $ 4,899 (165) $ 4,734 (3,897) $ 837 (76,062) (2,606) (7,059) $ (85,727) 7,580 $ 65,921 (79) $ 65,842 (38,573) $27,269 $44,726 (31,894) (3,332) 50,058 $ 14,832 23,398 $36,160 (240) $ 35,920 (14,884) $ 21,036 Net income (loss) attributable to non-controlling & redeemable non-controlling interests Net income (loss) attributable to Stagwell Inc. common shareholders $ (6,478) Earnings Per Share Basic Diluted Weighted Average Number of Shares Outstanding Basic Diluted STAGWELL TRANSFORMING MARKETING $(0.05) $(0.05) $ 0.01 $ 0.22 $ 0.01 $ 0.17 122,927 122,927 99,615 104,066 124,262 296,596 $(0.04) $ (0.04) 90,426 90,426 Note: Conversion of Class C shares currently results in an anti-dilutive effect. Therefore, GAAP requires Diluted earnings per share and share count to exclude the conversion of Class C shares. Numbers may not foot due to rounding. 18#19RECONCILIATION OF GAAP NET INCOME TO ADJ. EBITDA & FCF $ in Thousands Net Income Net income attributable to noncontrolling & redeemable noncontrolling interests Net income attributable to Stagwell Inc. common shareholders Non-operating items (1) Operating income Depreciation and amortization Impairment and other losses Stock-based compensation Deferred acquisition consideration Other items, net Adjusted EBITDA Cash interest paid Capital expenditures and software spend² Minority interest distributions Cash taxes paid Changes in working capital Free Cash Flow Full Year Ended December 31, 2022 2021 $ 65,842 35,920 (38,573) (14,884) 27,269 21,036 131,959 23,690 159,228 44,726 131,273 77,503 122,179 16,240 33,152 75,032 (13,405) 18,721 18,691 21,430 $ 451,118 $253,652 (70,935) (34,912) (13,408) (72,064) 9,867 $ 269,646 STAGWELL TRANSFORMING MARKETING Note: Figures may not foot due to rounding. (1) Non-operating items includes items within the Statements of Operations, below Operating Income, and above Net Income attributable to Stagwell Inc. common shareholders. (2) Software of approximately $13M included in "Capitalized software and other" line in statement of cash flows. 19#20RECONCILIATION OF COMBINED NET REVENUE GROWTH TO COMBINED ORGANIC NET REVENUE GROWTH COMPONENTS OF CHANGE CHANGE $ In thousands, except percentages Net Revenue - Year Ended December 31, 2021 Foreign Currency Net Acquisitions (Divestitures) Organic Total Change Net Revenue - Year Ended December 31, 2022 Organic Total Integrated Agencies $ 1,142,636 $ (8,327) $ 2,838 $ 110,221 $ 104,732 $1,247,368 9.6% 9.2% Network Brand Performance 543,376 (12,305) 38,434 98,377 124,506 667,882 18.1% 22.9% Network Communications 214,829 (970) 2,682 70,400 72,112 286,941 32.8 % 33.6% Network All Other 25,973 (835) (4,633) (543) (6,011) 19,962 (2.1)% (23.1)% Total $ 1,926,814 $(22,437) $ 39,321 $ 278,455 $295,339 $ 2,222,153 14.5% 15.3% STAGWELL TRANSFORMING MARKETING Note: Figures may not foot due to rounding. 20#21CAPITAL STRUCTURE Net Debt & Debt-Like ($M, as of 6/30/2023) Share Count5 (Thousands, as of 8/4/2023) Revolving Credit Facility $ 402 Class A 116,451 Bonds 1,100 NCI¹ 26 DAC2 114 Class C 151,649 (equal voting & economic rights to Class A) RNCI³ 47 Less: Investments4 19 Share-based awards6 701 Less: Cash 105 TOTAL NET DEBT & DEBT-LIKE $1,565 DILUTED 268,801 STAGWELL TRANSFORMING MARKETING Note: Share count assumes full conversion of Class C shares to Class A on a one-to-one basis. Numbers may not foot due to rounding 1. Excludes non-controlling interest of Stagwell Class C shareholders to reflect NCI balance pro forma for full conversion of Class C shares to Class A. 2. A portion of the DAC will be paid with approximately 4.6m shares assuming conversion as of 6/30/23. 3. Includes redeemable non-controlling interest and obligations in connection with profit interests held by employees. 4. Non-consolidated investments 5. Share Count does not include unvested stock grants, unsettled SARS or portion of DAC to be settled in stock. Pro Forma total share count as of 8/4/2023 would be 116.5m Class A shares, 151.6 Class C shares, 4.6m shares to settle DAC and 7.6m share-based awards, for a total of 280.4m shares outstanding. 6. Estimated shares to be issued upon the exercise of settled SAR awards using treasury method. 21#22STAGWELL TRANSFORMING MARKETING Thank You