Exhibit 99.1: Selected Segment Information. We are providing the following unaudited management discussion of past organic revenue performance “as if” our new segments had existed in their current configuration in the years 2019, 2020, and 2021. 2021 Segment Net Revenue Organic Change Our consolidated growth of organic revenue was 11.9% in 2021. The organic growth of our Media, Data & Engagement Solutions segment was 13.7%, which was led by notably strong growth in our Media, Data and Technology offerings. Growth was broadly shared across client sectors, led by our Retail, Health Care, Financial Services, and Technology & Telecom sectors. The organic growth of our Integrated Advertising & Creativity Led Solutions segment was 10.7%, which was broad‐based across our global and domestic agency networks. Among client sectors, growth was led by Health Care, followed by our Technology & Telecom, Retail and Other (mainly industrial and public) sectors. The organic growth of our Specialized Communications & Experiential Solutions segment was 10.3%, which was led by the recovery of our Events and Sports & Entertainment disciplines from the prior‐year impact of the pandemic, as well as strong growth in Public Relations. By client sector, the strongest growth was in our Other, Food & Beverage, Auto & Transportation, and Health Care sectors. 2020 Segment Net Revenue Organic Change Our consolidated change of organic revenue was negative 4.8% in 2020, due to the adverse impact of the COVID‐19 global pandemic on the economy and our business. The organic decrease of our Media, Data & Engagement Solutions segment was 5.4%; that decrease was predominantly driven by our project‐based digital specialist agencies. Our top performing client sectors, which increased for the year, were Retail, Health Care and Financial Services. The organic decrease of our Integrated Advertising & Creativity Led Solutions segment was 0.9%, due to decreases in our global and domestic advertising networks. Our top performing sectors were Health Care and Retail, both of which grew in 2020. The organic decrease at our Specialized Communications & Experiential Solutions segment was 13.0%, reflecting the significant impact
of the pandemic on our Events and Sports & Entertainment businesses during the year. Decreases were most significant in the Auto, Financial Services and Other sectors. 2019 Segment Net Revenue Organic Change Our consolidated organic growth of net revenue was 3.3% in 2019. The organic growth of our Media, Data & Engagement Solutions segment was 5.9%, driven by notably strong performance of our Media, Data & Technology services. Segment growth was led by our Retail, Financial Services, Other, and Consumer Goods sectors; the Automotive sector was significantly impacted in the year by a client loss. The organic growth of our Integrated Advertising & Creativity Led Solutions segment was 2.7%. Among our client sectors, growth was led by the Health Care sector, followed by Financial Services, Technology & Telecom and Consumer Goods. The organic decrease at our Specialized Communications & Experiential Solutions segment was 0.5%, where growth in Public Relations was offset by decreased revenue in our Events and Sports & Entertainment businesses. Strong growth in our Health Care and Food & Beverage sectors was offset by decreases in the Auto, Other and Consumer Goods sectors.
Q1 2021 Q2 2021 Q3 2021 Q4 2021 FY 2021 FY 2020 Total Revenue ‐ As previously reported IAN 1,851.4$ 2,077.8$ 2,085.7$ 2,404.5$ 8,419.4$ 7,410.1$ DXTRA 405.6 431.8 456.3 527.6 1,821.3 1,650.9 Total IPG Revenue 2,257.0$ 2,509.6$ 2,542.0$ 2,932.1$ 10,240.7$ 9,061.0$ Total Revenue ‐ As recast Media, Data & Engagement Solutions 871.5$ 1,003.0$ 1,001.5$ 1,185.7$ 4,061.7$ 3,520.4$ Integrated Advertisting & Creativity Led Solutions 953.9 1,049.5 1,034.0 1,142.9 4,180.3 3,727.8 Specialized Communications & Experiential Solutions 431.6 457.1 506.5 603.5 1,998.7 1,812.8 Total IPG Revenue (1) 2,257.0$ 2,509.6$ 2,542.0$ 2,932.1$ 10,240.7$ 9,061.0$ (1) Amounts were not impacted by changes in our reportable segments. Q1 2021 Q2 2021 Q3 2021 Q4 2021 FY 2021 FY 2020 Net Revenue ‐ As previously reported IAN 1,734.1$ 1,954.5$ 1,942.7$ 2,208.5$ 7,839.8$ 6,921.4$ DXTRA 293.6 315.1 319.0 340.4 1,268.1 1,143.1 Total IPG Net Revenue 2,027.7$ 2,269.6$ 2,261.7$ 2,548.9$ 9,107.9$ 8,064.5$ Net Revenue ‐ As recast Media, Data & Engagement Solutions 849.8$ 985.3$ 980.0$ 1,158.5$ 3,973.6$ 3,451.2$ Integrated Advertisting & Creativity Led Solutions 875.7 963.7 951.5 1,035.2 3,826.1 3,429.5 Specialized Communications & Experiential Solutions 302.2 320.6 330.2 355.2 1,308.2 1,183.8 Total IPG Net Revenue (1) 2,027.7$ 2,269.6$ 2,261.7$ 2,548.9$ 9,107.9$ 8,064.5$ (1) Amounts were not impacted by changes in our reportable segments. The Interpublic Group of Companies, Inc. Segment Realignment ‐ Net Revenue (Unaudited) The Interpublic Group of Companies, Inc. Segment Realignment ‐ Total Revenue (Unaudited) (Dollars in Millions) (Dollars in Millions)
Quarter Ended 3/31/2020 Quarter Ended 3/31/2021 Net Revenue Change ‐ As previously reported Net Revenue Foreign Currency Net Acquisitions/ (Divestitures) Organic Net Revenue Organic Total IAN 1,664.5$ 22.8$ (6.0)$ 52.8$ 1,734.1$ 3.2% 4.2% DXTRA 307.6 6.5 (5.7)$ (14.8) 293.6 (4.8%) (4.6%) IPG Total 1,972.1$ 29.3$ (11.7)$ 38.0$ 2,027.7$ 1.9% 2.8% Quarter Ended 3/31/2020 Quarter Ended 3/31/2021 Net Revenue Change ‐ As recast Net Revenue Foreign Currency Net Acquisitions/ (Divestitures) Organic Net Revenue Organic Total Media, Data & Engagement Solutions 811.7$ 14.1$ ‐$ 24.0$ 849.8$ 3.0% 4.7% Integrated Advertisting & Creativity Led Solutions 838.8 9.3 (5.8) 33.4 875.7 4.0% 4.4% Specialized Communications & Experiential Solutions 321.6 5.9 (5.9) (19.4) 302.2 (6.0%) (6.0%) IPG Total (1) 1,972.1$ 29.3$ (11.7)$ 38.0$ 2,027.7$ 1.9% 2.8% (1) Amounts were not impacted by changes in our reportable segments. The Interpublic Group of Companies, Inc. Segment Realignment ‐ Net Revenue Change (Unaudited) (Dollars in Millions) Components of Change Change Components of Change Change
Quarter Ended 6/30/2020 Quarter Ended 6/30/2021 Net Revenue Change ‐ As previously reported Net Revenue Foreign Currency Net Acquisitions/ (Divestitures) Organic Net Revenue Organic Total IAN 1,585.7$ 48.6$ (5.4)$ 325.6$ 1,954.5$ 20.5% 23.3% DXTRA 267.7 9.5 (2.6) 40.5 315.1 15.1% 17.7% IPG Total 1,853.4$ 58.1$ (8.0)$ 366.1$ 2,269.6$ 19.8% 22.5% Quarter Ended 6/30/2020 Quarter Ended 6/30/2021 Net Revenue Change ‐ As recast Net Revenue Foreign Currency Net Acquisitions/ (Divestitures) Organic Net Revenue Organic Total Media, Data & Engagement Solutions 766.9$ 25.6$ ‐$ 192.8$ 985.3$ 25.1% 28.5% Integrated Advertisting & Creativity Led Solutions 814.4 23.6 (5.3) 131.0 963.7 16.1% 18.3% Specialized Communications & Experiential Solutions 272.1 8.9 (2.7) 42.3 320.6 15.5% 17.8% IPG Total (1) 1,853.4$ 58.1$ (8.0)$ 366.1$ 2,269.6$ 19.8% 22.5% (1) Amounts were not impacted by changes in our reportable segments. Components of Change Change Components of Change Change The Interpublic Group of Companies, Inc. Segment Realignment ‐ Net Revenue Change (Unaudited) (Dollars in Millions)
Quarter Ended 9/30/2020 Quarter Ended 9/30/2021 Net Revenue Change ‐ As previously reported Net Revenue Foreign Currency Net Acquisitions/ (Divestitures) Organic Net Revenue Organic Total IAN 1,685.5$ 18.5$ (3.6)$ 242.3$ 1,942.7$ 14.4% 15.3% DXTRA 269.1 3.9 (4.0) 50.0 319.0 18.6% 18.5% IPG Total 1,954.6$ 22.4$ (7.6)$ 292.3$ 2,261.7$ 15.0% 15.7% Quarter Ended 9/30/2020 Quarter Ended 9/30/2021 Net Revenue Change ‐ As recast Net Revenue Foreign Currency Net Acquisitions/ (Divestitures) Organic Net Revenue Organic Total Media, Data & Engagement Solutions 838.9$ 7.5$ (0.1)$ 133.7$ 980.0$ 15.9% 16.8% Integrated Advertising & Creativity Led Solutions 836.8 11.3 (3.5) 106.9 951.5 12.8% 13.7% Specialized Communications & Experiential Solutions 278.9 3.6 (4.0) 51.7 330.2 18.5% 18.4% IPG Total (1) 1,954.6$ 22.4$ (7.6)$ 292.3$ 2,261.7$ 15.0% 15.7% (1) Amounts were not impacted by changes in our reportable segments. Components of Change Change The Interpublic Group of Companies, Inc. Segment Realignment ‐ Net Revenue Change (Unaudited) (Dollars in Millions) Components of Change Change
Quarter Ended 12/31/2020 Quarter Ended 12/31/2021 Net Revenue Change ‐ As previously reported Net Revenue Foreign Currency Net Acquisitions/ (Divestitures) Organic Net Revenue Organic Total IAN 1,985.7$ 4.2$ (3.4)$ 222.0$ 2,208.5$ 11.2% 11.2% DXTRA 298.7 1.2 (4.5) 45.0 340.4 15.1% 14.0% IPG Total 2,284.4$ 5.4$ (7.9)$ 267.0$ 2,548.9$ 11.7% 11.6% Quarter Ended 12/31/2020 Quarter Ended 12/31/2021 Net Revenue Change ‐ As recast Net Revenue Foreign Currency Net Acquisitions/ Divestitures Organic Net Revenue Organic Total Media, Data & Engagement Solutions 1,033.7$ 1.9$ ‐$ 122.9$ 1,158.5$ 11.9% 12.1% Integrated Advertising & Creativity Led Solutions 939.5 2.3 (3.4) 96.8 1,035.2 10.3% 10.2% Specialized Communications & Experiential Solutions 311.2 1.2 (4.5) 47.3 355.2 15.2% 14.1% IPG Total (1) 2,284.4$ 5.4$ (7.9)$ 267.0$ 2,548.9$ 11.7% 11.6% (1) Amounts were not impacted by changes in our reportable segments. Components of Change Change Components of Change Change The Interpublic Group of Companies, Inc. Segment Realignment ‐ Net Revenue Change (Unaudited) (Dollars in Millions)
Year Ended 12/31/2020 Year Ended 12/31/2021 Net Revenue Change ‐ As previously reported Net Revenue Foreign Currency Net Acquisitions/ Divestitures Organic Net Revenue Organic Total IAN 6,921.4$ 94.1$ (18.1)$ 842.4$ 7,839.8$ 12.2% 13.3% DXTRA 1,143.1 21.1 (16.8) 120.7 1,268.1 10.6% 10.9% IPG Total 8,064.5$ 115.2$ (34.9)$ 963.1$ 9,107.9$ 11.9% 12.9% Year Ended 12/31/2020 Year Ended 12/31/2021 Net Revenue Change ‐ As recast Net Revenue Foreign Currency Net Acquisitions/ Divestitures Organic Net Revenue Organic Total Media, Data & Engagement Solutions 3,451.2$ 49.2$ (0.1)$ 473.3$ 3,973.6$ 13.7% 15.1% Integrated Advertising & Creativity Led Solutions 3,429.5 46.3 (17.7) 368.0 3,826.1 10.7% 11.6% Specialized Communications & Experiential Solutions 1,183.8 19.7 (17.1) 121.8 1,308.2 10.3% 10.5% IPG Total (1) 8,064.5$ 115.2$ (34.9)$ 963.1$ 9,107.9$ 11.9% 12.9% (1) Amounts were not impacted by changes in our reportable segments. Components of Change Change Components of Change Change The Interpublic Group of Companies, Inc. Segment Realignment ‐ Net Revenue Change (Unaudited) (Dollars in Millions)
Year Ended 12/31/2019 Year Ended 12/31/2020 Net Revenue Change ‐ As previously reported Net Revenue Foreign Currency Net Acquisitions/ (Divestitures) Organic Net Revenue Organic Total IAN 7,328.8$ (66.9)$ (73.3)$ (267.2)$ 6,921.4$ (3.6%) (5.6%) DXTRA 1,296.3 (1.6) (5.8) (145.8) 1,143.1 (11.2%) (11.8%) IPG Total 8,625.1$ (68.5)$ (79.1)$ (413.0)$ 8,064.5$ (4.8%) (6.5%) Year Ended 12/31/2019 Year Ended 12/31/2020 Net Revenue Change ‐ As recast Net Revenue Foreign Currency Net Acquisitions/ (Divestitures) Organic Net Revenue Organic Total Media, Data & Engagement Solutions 3,685.5$ (33.5)$ ‐$ (200.8)$ 3,451.2$ (5.4%) (6.4%) Integrated Advertisting & Creativity Led Solutions 3,568.7 (32.5) (72.8) (33.9) 3,429.5 (0.9%) (3.9%) Specialized Communications & Experiential Solutions 1,370.9 (2.5) (6.3) (178.3) 1,183.8 (13.0%) (13.6%) IPG Total (1) 8,625.1$ (68.5)$ (79.1)$ (413.0)$ 8,064.5$ (4.8%) (6.5%) (1) Amounts were not impacted by changes in our reportable segments. Components of Change Change The Interpublic Group of Companies, Inc. Segment Realignment ‐ Net Revenue Change (Unaudited) (Dollars in Millions) Components of Change Change
Year Ended 12/31/2018 Year Ended 12/31/2019 Net Revenue Change ‐ As previously reported Net Revenue Foreign Currency Net Acquisitions/ (Divestitures) Organic Net Revenue Organic Total IAN 6,720.9$ (124.5)$ 465.5$ 266.9$ 7,328.8$ 4.0% 9.0% DXTRA 1,310.7 (18.6) 2.3 1.9 1,296.3 0.1% (1.1%) IPG Total 8,031.6$ (143.1)$ 467.8$ 268.8$ 8,625.1$ 3.3% 7.4% Year Ended 12/31/2018 Year Ended 12/31/2019 Net Revenue Change ‐ As recast Net Revenue Foreign Currency Net Acquisitions/ (Divestitures) Organic Net Revenue Organic Total Media, Data & Engagement Solutions 3,042.7$ (67.2)$ 531.0$ 179.0$ 3,685.5$ 5.9% 21.1% Integrated Advertisting & Creativity Led Solutions 3,597.3 (58.1) (67.2) 96.7 3,568.7 2.7% (0.8%) Specialized Communications & Experiential Solutions 1,391.6 (17.8) 4.0 (6.9) 1,370.9 (0.5%) (1.5%) IPG Total (1) 8,031.6$ (143.1)$ 467.8$ 268.8$ 8,625.1$ 3.3% 7.4% (1) Amounts were not impacted by changes in our reportable segments. Components of Change Change The Interpublic Group of Companies, Inc. Segment Realignment ‐ Net Revenue Change (Unaudited) (Dollars in Millions) Components of Change Change
Q1 2021 Q2 2021 Q3 2021 Q4 2021 FY 2021 FY 2020 Segment EBITA ‐ As previously reported IAN 254.3$ 382.9$ 352.0$ 476.1$ 1,465.3$ 699.1$ DXTRA 40.4 54.7 53.3 38.1 186.5 56.5 Corporate and Other (30.1) (31.6) (32.3) (35.4) (129.4) (81.3) Total IPG Adjusted EBITA (1) 264.6$ 406.0$ 373.0$ 478.8$ 1,522.4$ 674.3$ Segment EBITA ‐ As recast Media, Data & Engagement Solutions 135.8$ 201.6$ 198.5$ 282.1$ 818.0$ 385.7$ Integrated Advertisting & Creativity Led Solutions 118.1 183.1 152.9 192.1 646.2 329.2 Specialized Communications & Experiential Solutions 40.8 52.9 53.9 40.0 187.6 40.7 Corporate and Other (1) (30.1) (31.6) (32.3) (35.4) (129.4) (81.3) Total IPG Adjusted EBITA (1)(2) 264.6$ 406.0$ 373.0$ 478.8$ 1,522.4$ 674.3$ (1) Amounts were not impacted by changes in our reportable segments. Q1 2021 Q2 2021 Q3 2021 Q4 2021 FY 2021 FY 2020 Segment EBITA Margin on Net Revenue ‐ As previously reported IAN 14.7% 19.6% 18.1% 21.6% 18.7% 10.1% DXTRA 13.8% 17.4% 16.7% 11.2% 14.7% 4.9% Total IPG Adjusted EBITA Margin on Net Revenue (1) 13.0% 17.9% 16.5% 18.8% 16.7% 8.4% Segment EBITA Margin on Net Revenue ‐ As recast Media, Data & Engagement Solutions 16.0% 20.5% 20.3% 24.4% 20.6% 11.2% Integrated Advertisting & Creativity Led Solutions 13.5% 19.0% 16.1% 18.6% 16.9% 9.6% Specialized Communications & Experiential Solutions 13.5% 16.5% 16.3% 11.3% 14.3% 3.4% Total IPG Adjusted EBITA Margin on Net Revenue (1)(2) 13.0% 17.9% 16.5% 18.8% 16.7% 8.4% (1) Amounts were not impacted by changes in our reportable segments. (2) Adjusted EBITA is a financial measure that is not defined by U.S. GAAP. Refer to Non‐GAAP reconciliation for details of Adjusted EBITA calculation. (1) Adjusted EBITA is a financial measure that is not defined by U.S. GAAP. Refer to Non‐GAAP reconciliation for details of Adjusted EBITA calculation. (2) Adjusted EBITA is a financial measure that is not defined by U.S. GAAP. Refer to Non‐GAAP reconciliation for details of Adjusted EBITA calculation. (1) Adjusted EBITA is a financial measure that is not defined by U.S. GAAP. Refer to Non‐GAAP reconciliation for details of Adjusted EBITA calculation. (Dollars in Millions) The Interpublic Group of Companies, Inc. Segment Realignment ‐ Segment EBITA (Unaudited) The Interpublic Group of Companies, Inc. Segment Realignment ‐ Segment EBITA Margin on Net Revenue (Unaudited)
Q1 2021 Q2 2021 Q3 2021 Q4 2021 FY 2021 FY 2020 Restructuring Charges ‐ As previously reported IAN 0.5$ ‐$ (0.6)$ 3.1$ 3.0$ 317.9$ DXTRA 0.8 (0.3) (0.6) 9.8 9.7 78.8 Corporate and Other ‐ 0.1 (2.3) 0.1 (2.1) 17.1 Total IPG Restructuring Charges 1.3$ (0.2)$ (3.5)$ 13.0$ 10.6$ 413.8$ Restructuring Charges ‐ As recast Media, Data & Engagement Solutions ‐$ 0.2$ (0.4)$ 0.3$ 0.1$ 159.9$ Integrated Advertisting & Creativity Led Solutions 0.4 (0.4) (0.2) 2.8 2.6 148.1 Specialized Communications & Experiential Solutions 0.9 (0.1) (0.6) 9.8 10.0 88.7 Corporate and Other (1) ‐ 0.1 (2.3) 0.1 (2.1) 17.1 Total IPG Restructuring Charges (1) 1.3$ (0.2)$ (3.5)$ 13.0$ 10.6$ 413.8$ (1) Amounts were not impacted by changes in our reportable segments. The Interpublic Group of Companies, Inc. Segment Realignment ‐ Restructuring Charges (Unaudited) (Dollars in Millions)
Q1 2021 Q2 2021 Q3 2021 Q4 2021 FY 2021 FY 2020 Non‐GAAP Reconciliation ‐ As previously reported Net Revenue 2,027.7$ 2,269.6$ 2,261.7$ 2,548.9$ 9,107.9$ 8,064.5$ Adjusted EBITA Reconciliation: Net Income Available to IPG Common Stockholders 91.7$ 263.3$ 239.9$ 357.9$ 952.8$ 351.1$ Add back: Provision for Income Taxes 23.8 86.7 73.9 67.4 251.8 8.0 Subtract: Total (expenses) and other income (126.6) (30.3) (33.2) (24.0) (214.1) (227.1) Equity in net (loss) income of unconsolidated affiliates (0.2) 0.4 0.2 2.1 2.5 0.9 Net income attributable to noncontrolling interests (0.7) (4.5) (4.7) (10.1) (20.0) (3.1) Operating Income 243.0 384.4 351.5 457.3 1,436.2 588.4 Add back: Amortization of acquired intangibles 21.6 21.6 21.5 21.5 86.2 85.9 Total IPG Adjusted EBITA (1) 264.6$ 406.0$ 373.0$ 478.8$ 1,522.4$ 674.3$ Adjusted EBITA Margin on Net Revenue 13.0% 17.9% 16.5% 18.8% 16.7% 8.4% Restructuring Charges 1.3 (0.2) (3.5) 13.0 10.6 413.8 Adjusted EBITA before Restructuring Charges (1) 265.9$ 405.8$ 369.5$ 491.8$ 1,533.0$ 1,088.1$ Adjusted EBITA before Restructuring Charges on Net Revenue 13.1% 17.9% 16.3% 19.3% 16.8% 13.5% (1) Adjusted EBITA and Adjusted EBITA before restructuring Charges are financial measures that are not defined by U.S. GAAP. Adjusted EBITA is calculated as net income available to IPG common stockholders before provision for income taxes, total (expenses) and other income, equity in net (loss) income of unconsolidated affiliates, net income attributable to noncontrolling interests and amortization of acquired intangibles. Adjusted EBITA before restructuring charges is calculated as Adjusted EBITA, as defined previously, before restructuring changes. The Interpublic Group of Companies, Inc. Non‐GAAP Reconciliation ‐ Adjusted Results (Unaudited) (Dollars in Millions)