On October 20, 2023, The Interpublic Group of Companies, Inc. held a conference call to discuss its third-quarter and first-nine-months 2023 results. CALL PARTICIPANTS IPG PARTICIPANTS Philippe Krakowsky Chief Executive Officer Ellen Johnson Executive Vice President, Chief Financial Officer Jerry Leshne Senior Vice President, Investor Relations ANALYST PARTICIPANTS Adrien de Saint Hilaire BofA Securities David Karnovsky J.P.Morgan Benjamin Swinburne Morgan Stanley Michael Nathanson MoffettNathanson Steven Cahall Wells Fargo Securities Tim Nollen Macquarie Jason B. Bazinet Citi Julien Roch Barclays

2 COMPANY PRESENTATION AND REMARKS Operator: Good morning, and welcome to the Interpublic Group third-quarter 2023 conference call. . . . I would now like to introduce Mr. Jerry Leshne, Senior Vice President of Investor Relations. Sir, you may begin. Jerry Leshne, Senior Vice President, Investor Relations: Good morning. Thank you for joining us. This morning, we are joined by our CEO, Philippe Krakowsky, and by Ellen Johnson, our CFO. We have posted our earnings release and our slide presentation on our website, interpublic.com. We will begin with prepared remarks, to be followed by Q&A. We plan to conclude before market open at 9:30 Eastern time. During this call we will refer to forward-looking statements about our Company. These are subject to the uncertainties and the cautionary statement that are included in our earnings release and the slide presentation. These are further detailed in our 10-Q and other filings with the SEC. We will also refer to certain non-GAAP measures. We believe that these measures provide useful supplemental data that, while not a substitute for GAAP measures, allow for greater transparency in the review of our financial and operational performance. At this point, it is my pleasure to turn things over to Philippe Krakowsky. Philippe Krakowsky, Chief Executive Officer Thank you, Jerry. As usual, this morning, I'll begin with a high-level view of the quarter, after which Ellen will provide additional details. I'll conclude with updates on our agencies, to be followed by Q&A. Before getting to the business of the call, however, it seems not only appropriate but necessary to speak to our collective shock and grief in response to the terrorist attacks perpetrated in Israel and their aftermath. Thankfully, our colleagues in Israel are safely accounted for, though many are being called into service. We are also clearly in the midst of a humanitarian crisis in the region. So our thoughts go out to all innocent lives that have been impacted by violence, and those who remain in harm’s way. Given the scale of our operations in Israel, we’ll also spend a bit more time later in the call discussing the implications on IPG’s business. Turning to 3Q performance, starting at the top with revenue, results did not measure up to expectations. The organic change of our revenue before billable expenses was a

3 decrease of 40 basis points. For the first nine months of the year, our organic decrease is therefore 80 basis points from a year ago, inconsistent with a trailing-three-year growth of 15.7%. The same factors that we’ve discussed as having impacted the first half of the year continued to weigh on the third quarter. These are, in order of magnitude, the decrease in client activity in the tech & telecom client sector, which has been evident across our industry this year, and the under-performance of our digital specialist agencies. Decreases in both of these areas were at about the same scale as we identified in the second quarter and together they weighed on our third-quarter growth by approximately 3.2%. As we have spoken to in recent quarters, major marketers in the technology sector are consumers of our core services. And, as a sector, their budgets this year have seen significant cost-cutting, in line with broader austerity efforts at those companies. While it’s challenging to call the timing of the upturn in their marketing spend, we do believe that the current pressures on this sector will abate, since these market leaders will need to return to growth mode. Another key factor negatively impacting our results is the broad concern among marketers related to macroeconomic conditions, which we have identified in our previous calls this year. Economic concerns have translated into what is now an unmistakably more cautious tone in the business. We saw those headwinds take several forms, including pauses in certain planned activities, fewer and generally smaller project opportunities and a slower-than-anticipated pace in conversion and on- boarding of new business. Notwithstanding those challenges, it’s worth noting that we did see progressively better performance from month to month during the third quarter, with growth in September. We also saw aggregate growth among our top-20 clients in the quarter. We continue to anticipate that the new business that we have won across the first part of this year will be more visible in our results going forward. And, as was announced yesterday, we were pleased to see General Mills tap UM as their global media agency of record. UM will handle all strategy, planning, buying, analytics, performance and commerce efforts across 36 markets for this important client. It’s also worth highlighting that, in the quarter, we continued to see growth in areas of the business that have been key drivers of success for us over a number of years, namely our media offerings, which performed very strongly, and the healthcare sector. In addition, we had solid growth in sports & entertainment marketing, public relations and our experiential offerings. Six of our eight client sectors grew during the quarter, as has been the case in the nine months year-to-date. We were led in the quarter by the strong growth of auto & transportation, followed by our “Other” sector of diversified industrials and public- sector clients, the financial services and healthcare sectors. Healthcare grew in the quarter, though not at the more robust levels we had expected. The food & beverage and consumer goods sectors also increased in Q3. We had a slight decrease in the retail sector. The tech & telecom sector decreased in the high-teens on a percentage

4 basis. An this is not only due to the larger trend in the sector, but also to a significant client loss at McCann. Regionally, we saw organic growth in the quarter across the U.K., Europe, Latin America and our Other Markets group. The U.S. and Asia Pacific regions decreased. Lower revenue in the U.S. was predominantly due to the sector- and agency-specific challenges we’ve called out. As we looking ahead to the balance of this year, the geopolitical situation in the Middle East adds a degree of uncertainty to our business. Our operations in Israel include the full range of creative, marketing services and media offerings, and they represent approximately one percent of total IPG global revenue. As you’d expect, economic activity in the country is at a standstill, which has already begun to have an impact, during what it is seasonally the business’s largest quarter. The developing geopolitical crisis is, of course, foremost a human concern, and our top priority is to do what we can to support our colleagues in the region. But, in the context of this call, we did feel it was necessary to point out that it will also have some business implications. Turning to segment performance, Media, Data & Engagement Solutions grew organically by 50 basis points in the quarter. We continued to see very strong growth at our media offerings, but that was again largely offset by challenged results at our digital specialty agencies. Our segment of Integrated Advertising & Creativity Led Solutions decreased 4.1% organically, as the tech & telecom client sector and a more cautious spending climate weighed on our more traditional consumer advertising agencies. FCB’s strong performance in the quarter was a notable exception, powered by its strategy of incorporating data-informed, audience-led thinking into its core creative offering. Our segment of Specialized Communications & Experiential Solutions grew by 6.5% organically. The quarter was highlighted by increases in sports & entertainment, experiential and public relations. Turning to an overview of expenses and margin, operating discipline continued to be a strength and was fully in evidence during the quarter. Third-quarter adjusted EBITA margin was 17.2%, up from 15.5% a year ago. Across the group, we are effectively managing our flexible operating model, which you can see in our expenses for temporary labor, performance-based incentive compensation and SG&A. Total headcount decreased by 1.5% percent from a year ago. Occupancy expense decreased as well, as we continue to benefit from actions taken on our real estate portfolio, and other variable expense such as travel were a source of operating leverage. Our diluted earnings per share in the quarter was $0.63 as reported and was $0.70 as adjusted for intangibles amortization and other items. During the quarter, we repurchased 2.6 million shares, returning $91 million to shareholders. That brings our share repurchases for the nine months to 6.1 million shares, using $219 million.

5 The strength and strategic relevance of our offerings is evident in our new business wins year-to-date and our long-term record of organic growth. That said, we had anticipated that the puts and takes in Q3 would have netted to better revenue performance than reflected in our results today. And I’ll do more to unpack that for you in my closing remarks. Turning to our outlook for the remainder of the year, given the trends we have called out for you since the beginning of the year, the fact that macro conditions have become more challenging, as well as the incremental impact of geopolitical uncertainty, we believe organic revenue performance for the fourth quarter will come in at approximately 1% growth. Nonetheless, we remain committed to our margin goal for the year of 16.7%. Our current level of performance is not up to the standards we’ve set over many years. We’ll therefore be looking to close this year as strongly as possible and, specific to identified areas of underperformance, also assess structural internal solutions to improve our growth profile. At this point, I’ll hand the call over to Ellen for a more detailed review of our results.

6 Ellen Johnson, Executive Vice President, Chief Financial Officer: Thank you, Philippe. As a reminder, my remarks will track to the presentation slides that accompany our webcast. Beginning with the highlights on slide 2 of the presentation, our third-quarter revenue before billable expenses, or net revenue, increased 60 basis points from a year ago, with an organic decrease of 40 basis points. Our organic decrease was 1.2% in the U.S., while we grew 1.1% organically in our international markets. Over the first nine months of the year, our organic revenue decrease was 80 basis points. Third-quarter adjusted EBITA was $397.2 million, an increase of 11.5% from a year ago, and margin was 17.2%. Our diluted earnings per share in the quarter was $0.63 cents as reported and $0.70 cents as adjusted. The adjustments exclude the after-tax impacts of the amortization of acquired intangibles and non-operating losses on the sales of certain small, nonstrategic businesses. We repurchased 2.6 million shares during the quarter and 6.1 million shares in the year’s first nine months. Turning to slide 3, you’ll see our P&L for the quarter. I’ll cover revenue and operating expenses in detail in the slides that follow. Turning to third-quarter revenue in more detail, on slide 4: • Our net revenue in the quarter was $2.31 billion. • Compared to Q3-22, the impact of the change in exchange rates was positive 70 basis points, with the U.S. dollar weaker against the euro, pound and several LatAm currencies compared to last year, but stronger against most currencies in AsiaPac and the Canadian dollar. • Our net acquisitions added 30 basis points. • Our organic decrease of revenue before billable expenses was 40 basis points. • For the nine months, our organic decrease was 80 basis points. The performance of our segments is at the bottom of this slide. • Our Media, Data & Engagement Solutions segment grew organically by 50 basis points. We had very strong global growth at our media businesses, though that was largely offset by the continued underperformance by our digital specialist agencies. • Our Integrated Advertising & Creativity Led Solutions segment decreased organically by 4.1%. Lower revenue from clients in the tech & telecom sector and a more challenging macro environment was felt broadly across our more traditional, consumer-facing agencies.

7 • At our Specialized Communications & Experiential Solutions segment, organic growth was 6.5%, with growth across our sports & entertainment, public relations and experiential disciplines. Moving on to slide 5 and organic net revenue growth by region: • In the U.S., which was 65% of our revenue before billable expenses in the quarter, our organic decrease was 1.2%, against 4.4% growth in last year’s third quarter. o Decreases among tech & telecom sector clients and a more cautious macroeconomic environment continued to weigh on our performance, notably at our digital specialists and at most of our creatively led agencies. o We had strong growth at our media offerings, followed by increases at our sports & entertainment, experiential and public relations disciplines. • International markets, which were 35% of our net revenue, grew organically 1.1% in the quarter, on top of 7.8% a year ago. o The U.K., which was 8% of net revenue in the quarter, grew 2.2% organically, on top of 4.9% a year ago. Growth was led by IPG Mediabrands, McCann and FCB. o Continental Europe, which was 8% of net revenue, grew 3.9% organically in the quarter, compounding last year’s 4.7% growth. We were led by growth in Spain and Germany, as well as by increases in smaller national markets. o AsiaPac was also 8% of net revenue in the quarter. Our organic decrease was 5.0%, compared to 5.6% growth a year ago, due to decreases in Japan and China. o In LatAm, which was 5% of net revenue, our organic growth was 5.7%, on top of 19.8% a year ago, with increases across all national markets, led by Colombia and Argentina. o In our Other Markets group, which is Canada, the Middle East and Africa, we grew 1.2%, on top of 10.6% a year ago. Moving on to slide 6 and operating expenses in the quarter: • Our net operating expenses, which exclude billable expenses, the amortization of acquired intangibles and restructuring adjustments, decreased 1.5% from a year ago, compared with the growth in reported net revenue of 60 basis points. • The result was adjusted EBITA margin of 17.2%, an increase of 170 basis points from a year ago. • As you can see on this slide, our ratio of total salaries & related expense as a percentage of net revenue decreased by 110 basis points, to 66.3% from 67.4% in last year’s third quarter. o Compared to last year, we de-levered on our expense for base payroll, benefits & tax, while our expense for temporary labor, employee

8 incentive compensation and severance decreased as a percent of net revenue. Each of these ratios is shown in the appendix on slide 31. o Headcount at quarter end was 57,700, a decrease of 1.5% from a year ago. • Also on this slide, our office & other direct expense was 13.8% of net revenue, compared with 14.3% in Q3-22. Underneath that improvement, we continued to leverage our expense for occupancy and “all other” office & other expense. • Our SG&A expense was 70 basis points of net revenue, an improvement of 10 basis points. On slide 7 we present the detail on adjustments to our reported third-quarter results, in order to provide better transparency and a picture of comparable performance. This begins on the left-hand side with reported results and, from left to right, steps through to adjusted EBITA and our adjusted diluted EPS. • Our expense for the amortization of acquired intangibles, in the second column, was $21.0 million. • The adjustment to previous restructuring actions was a credit of $600,000. • Below operating expenses, and shown in column 4, we had a loss of $12.1 million in “other” expenses that was due to dispositions of a few small, nonstrategic businesses. • At the foot of this slide, you can see the after-tax impact per diluted share of each adjustment, which bridges our diluted EPS as reported at $0.63 to adjusted earnings of $0.70 per diluted share. Slide 8 depicts similar adjustments for the nine months. Our diluted earnings per share was $1.64 as reported and $1.81 as adjusted. As a reminder, reported and adjusted EPS for the year-to-date period includes the benefit of $0.17 per share recorded to our tax provision in this year’s second quarter. On slide 9 we turn to cash flow in the quarter: • Cash from operations was $242.7 million, and operating cash flow before working capital was $365.4 million. As a reminder, our operating cash flow is highly seasonal and can be volatile by quarter due to changes in the working capital component. • In our investing activities we used $48.6 million, essentially all of which was towards cap-ex in the quarter. • Our financing activities used $225.5 million, mainly reflecting capital returned to shareholders. • Our net decrease in cash for the quarter was $52.7 million. Slide 10 is the current portion of our balance sheet. We ended the quarter with $1.57 billion of cash and equivalents and $102 million in short-term marketable securities, to be held to maturity, which is before year-end.

9 Slide 11 depicts the maturities of our outstanding debt. As you can see on this schedule, total debt at quarter end was $3.2 billion. That includes our $300 million 10- year note, which we issued in June to prefund our $250 million maturity in April of next year. Thereafter, our next maturity is not until 2028. In summary, on slide 12, our strong financial discipline continues, and the strength of our balance sheet and liquidity means that we remain well-positioned both financially as well as commercially. And with that, I’ll turn it back to Philippe.

10 Mr. Krakowsky: Thanks, Ellen. Without question, organic revenue performance to date this year is not consistent with our expectations or our long-term track record. We continue to be in-market with relevant and compelling offerings that are helping marketers accelerate growth and deliver business outcomes, and that has translated to new business success year-to- date. Now, for many of you who have been with us over a period of years, you know that we were among the first to embed digital capabilities across media, healthcare and many of our marketing services, as well as recognize the importance of integrated services in an increasingly complex consumer ecosystem. Similarly, we were early to understand the growing importance of data resources and first-party data capabilities at scale as key tools to power the success of our clients. Given the very rapid rate of change we are all experiencing, we continue to further evolve our offerings, investing in ways that help brands compete in a dynamic world of new technology platforms and empowered consumers. This work has meant that increasingly large portions of our portfolio are better oriented to secular areas of growth. Consistent with that objective, during the quarter, we launched our Unified Retail Media Solution, which is a dedicated business unit within Mediabrands. It helps clients manage their investments across all retail media networks, one of the fastest-growing advertising channels. That solution is already helping brands maximize their media investments across all of the retail channels in real time in order to drive next-best business outcomes. Earlier this week, we also launched Real ID in the cloud, a tool powered by Acxiom and piloted at FCB, that modernizes identity resolution and addresses an industry need for identity tools in a post-cookie world. Built on ethically sourced data that prioritizes consumer privacy, Real ID creates the opportunity for us to do the kind of intelligent, data-driven work that we’ve been doing in media for some time across all marketing channels and disciplines. Our AI Steering Committee, which includes leaders from across our network, continues its work overseeing strategic partnerships and sharing use cases across the Group. As you know, we have been using machine learning and other AI tools in our data and media business for a number of years. With hundreds of new AI pilots underway across the Company, we’re tracking a subset of promising programs with a particular focus on three new areas. First, using AI to generate content, including text, images, audio and video in our ideation and creative processes. Second, AI as a tool to uncover strategy, insights as well as business trends that can help our clients and their brands. And finally, piloting the use of intelligent chatbots to automate tasks like program recommendations and other key steps on consumers’ e-commerce journeys.

11 Given the impact AI will continue to have on all businesses, including ours, we are fully engaged with leading AI innovators, which is Adobe, Amazon, Google, Microsoft, NVIDIA and Salesforce. For example, during the quarter, NVIDIA worked closely with us, and specifically with our PR agencies, to incorporate AI-enabled processes into earned media and corporate communications workflows. And just to step back and talk a bit again about our reporting segments in some detail, as discussed earlier, within the MD&E segment, we had very strong growth at our media offerings, but that continued to be largely offset by the challenges within our digital specialty agencies. Notably, during the quarter, we brought three distinct Mediabrands companies, Kinesso, Matterkind and Reprise, under the KINESSO banner and brand to create a unified, tech-driven performance unit that enhances the effectiveness, efficiency and simplicity of media activation that is end-to-end across that value chain. And, as mentioned earlier, General Mills is another great piece of news at Mediabrands. During the quarter, Acxiom announced that its InfoBase consumer insights and audiences are now available in cloud data exchanges, and received a Salesforce partner innovation award for work it’s doing with its Heathrow client. The company also recently launched Acxiom Health, which is its latest vertical offering, and provides advertisers with quality audiences that spans both consumers and healthcare providers, with more effective reach and precision. At Huge, the agency had a number of wins with their new suite of consultative products tailored to specific client business problems, which allows them to delivery strategy to execution very rapidly and effectively. The agency also expanded its relationship with Darling Ingredients, which was begun earlier this year, with a significant design & build project. On the product development side, Huge launched what it calls its AI opportunity mapper product, which helps clients anticipate the big shifts that GenAI will have in their specific industry and identify opportunities for growth across near-, mid- and long-term horizons. And looking at R/GA, the agency announced new business wins in the U.S. for Bloomberg and the BBC; and in LatAm for Banco Safra, which is Brazil’s premier financial institution. R/GA also launched the Associates program, a unique approach to fractional hiring that offers flexibility and emphasizes adaptability and creativity. And the agency’s work for clients like Procter & Gamble and the Ad Council was recently recognized as a finalist for Fast Company’s “Innovation by Design” Awards. Within the IAC segment, as we mentioned, tech & telco weighed on our more traditional consumer advertising agencies, but FCB was a notable exception to that. The network is playing a key role in our integrated Pfizer team and also expanded relationships with existing clients and new clients, which is Diageo, Danone and Upfield in global markets. IPG Health’s focus on creativity, technology and data continue to be key to their clients, and during the quarter, the network launched the industry’s first clinical trial diversity offering, designed to help pharma and healthcare companies ensure more inclusive treatment innovations.

12 Last month, following a competitive pitch process, IKEA chose McCann as its first global brand marketing partner. Domestically, T.J. Maxx hired McCann as its creative AOR, and Reckitt’s Durex brand named MRM and McCann as brand leads in Europe and the U.S. In addition, the network launched McCann Content Studios, its new global hub for social and creator services. MullenLowe retained the DHRA account, which is the arm of the U.S. Department of Defense focused on military recruitment across all service branches. This renewal is for five years, with an expanded remit that includes advertising, CRM, database management, integrated media, social, digital and PR. Our SC&E Solutions segment as we mentioned saw growth across all disciplines. Following a strong new business track record year-to-date, in Q3 Golin won new business including Eve Air Mobility; Tapestry, the luxury brand holding company that owns Coach and Kate Spade; as well as Neutrogena, the Kenvue skincare brand. Momentum grew strongly with core clients, including Verizon and Nike, and brought on a number of new clients, notably John Deere. Most recently, the company secured three AI patents for the machine learning of experiences, which makes them the first agency to do so in their area of expertise. Octagon signed the ACC as a new client at their industry-leading media rights division. And the agency won new client brands, including Hilton Hotels and Powerade, as well as working with current clients Budweiser, Mastercard and Unilever to manage activations at major global sporting events. At Jack Morton, Vivi, the agency’s diversity-driven inclusive marketing practice, posted wins and new work with the NBA and TIAA. There were also additional new client adds with Paramount+ and Comcast and a largescale reinvigoration of ESPN’s SportsCenter. Weber Shandwick saw growth in the health sector and in its government and public policy work. On the new-business front, notable wins included Dollar Shave Club and a significant new assignment with the CDC. The network also expanded its predictive analytics + intelligence capability with the rollout of a new proprietary solution that measures the impact of earned media. Despite these highlights from across the portfolio, as you can see from our results, the third quarter didn’t unfold along the lines that we envisioned when we spoke with you in July. At that time, we had shared our view of a second half inflection point for stronger growth, driven by several factors. One was the accelerating growth of our media business, which did materialize, with notably stronger performance in the third quarter than we’d seen earlier in the year. We had also looked forward to a similar trajectory in our healthcare vertical. And while healthcare did grow in the quarter, across the category, it was not at the level we had anticipated. However, with new business coming online stronger in Q4, we do see health returning to its more typical rate of revenue growth. And, as I mentioned earlier, during Q3, while we saw the impact of new business coming onstream, it was slower to convert than the rate that we had foreseen.