X0508 4 2024-02-29 0 0000876883 Stagwell Inc STGW 0001771735 Penn Mark Jeffery C/O STAGWELL INC. ONE WORLD TRADE CENTER, FLOOR 65 NEW YORK NY 10007 1 1 1 0 Chief Executive Officer 0 Class A Common Stock 2024-02-29 4 P 0 10000 5.2759 A 2490469 D Class A Common Stock 130000 I See Footnote The purchase price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $5.265 to $5.28, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote. Held by The Stagwell Group LLC ("Stagwell Group"). The Reporting Person is the controlling person of Stagwell Group. The Reporting Person disclaims beneficial ownership of the securities reported herein except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed an admission that the Reporting Person is the beneficial owner of, or has any pecuniary interest in, such securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose. /s/ Mark Penn 2024-02-29