X0202 SCHEDULE 13G/A 0000919574-26-001905 0001954661 XXXXXXXX LIVE 1 Class A common stock, $0.0001 par value per share 06/30/2026 0001776661 Advantage Solutions Inc. 00791N201 7676 Forsyth Boulevard, Fifth Floor St. Louis MO 63105 Rule 13d-1(c) CastleKnight Master Fund LP b E9 0.00 757354.00 0.00 757354.00 757354.00 N 5.9 PN This figure represents the amount of Class A common stock, $0.0001 par value per share beneficially owned by the Reporting Persons as of August 14, 2026. As of June 30, 2026 the Reporting Persons beneficially owned 581,347 shares of Class A common stock, $0.0001 par value per share. CastleKnight Fund GP LLC b DE 0.00 757354.00 0.00 757354.00 757354.00 N 5.9 OO CastleKnight Management LP b DE 0.00 757354.00 0.00 757354.00 757354.00 N 5.9 IA PN CastleKnight Management GP LLC b DE 0.00 757354.00 0.00 757354.00 757354.00 N 5.9 OO Weitman Capital LLC b NJ 0.00 757354.00 0.00 757354.00 757354.00 N 5.9 OO Aaron Weitman b X1 0.00 757354.00 0.00 757354.00 757354.00 N 5.9 HC IN Advantage Solutions Inc. 7676 Forsyth Boulevard, Fifth Floor, St. Louis, Missouri 63105 CastleKnight Master Fund LP CastleKnight Fund GP LLC CastleKnight Management LP CastleKnight Management GP LLC Weitman Capital LLC Aaron Weitman CastleKnight Master Fund LP Maples Corporate Services Limited P.O. Box 309 Ugland House Grand Cayman KY1-1104 Cayman Islands CastleKnight Fund GP LLC 888 Seventh Avenue, 24th Floor New York, New York 10019 United States of America CastleKnight Management LP 888 Seventh Avenue, 24th Floor New York, New York 10019 United States of America CastleKnight Management GP LLC 888 Seventh Avenue, 24th Floor New York, New York 10019 United States of America Weitman Capital LLC c/o Aaron Weitman c/o CastleKnight Management LP 888 Seventh Avenue, 24th Floor New York, New York 10019 United States of America Aaron Weitman c/o CastleKnight Management LP 888 Seventh Avenue, 24th Floor New York, New York 10019 United States of America CastleKnight Master Fund LP - Cayman Islands CastleKnight Fund GP LLC - Delaware CastleKnight Management LP - Delaware CastleKnight Management GP LLC - Delaware Weitman Capital LLC - New Jersey Aaron Weitman - United States of America Y CastleKnight Master Fund LP - 757,354 CastleKnight Fund GP LLC - 757,354 CastleKnight Management LP - 757,354 CastleKnight Management GP LLC - 757,354 Weitman Capital LLC - 757,354 Aaron Weitman - 757,354 CastleKnight Master Fund LP - 5.9% CastleKnight Fund GP LLC - 5.9% CastleKnight Management LP - 5.9% CastleKnight Management GP LLC - 5.9% Weitman Capital LLC - 5.9% Aaron Weitman - 5.9% CastleKnight Master Fund LP - 0 CastleKnight Fund GP LLC - 0 CastleKnight Management LP - 0 CastleKnight Management GP LLC - 0 Weitman Capital LLC - 0 Aaron Weitman - 0 CastleKnight Master Fund LP - 757,354 CastleKnight Fund GP LLC - 757,354 CastleKnight Management LP - 757,354 CastleKnight Management GP LLC - 757,354 Weitman Capital LLC - 757,354 Aaron Weitman - 757,354 CastleKnight Master Fund LP - 0 CastleKnight Fund GP LLC - 0 CastleKnight Management LP - 0 CastleKnight Management GP LLC - 0 Weitman Capital LLC - 0 Aaron Weitman - 0 CastleKnight Master Fund LP - 757,354 CastleKnight Fund GP LLC - 757,354 CastleKnight Management LP - 757,354 CastleKnight Management GP LLC - 757,354 Weitman Capital LLC - 757,354 Aaron Weitman - 757,354 Y Y N Please see Exhibit B attached hereto. Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. Exhibit A - Joint Filing Agreement Exhibit B - Control Person Identification CastleKnight Master Fund LP By: CastleKnight Fund GP LLC, its general partner By: Weitman Capital LLC, its managing member, /s/ Aaron Weitman 08/14/2026 CastleKnight Fund GP LLC By: Weitman Capital LLC, its managing member, /s/ Aaron Weitman 08/14/2026 CastleKnight Management LP By: CastleKnight Management GP LLC, its general partner, By: Weitman Capital LLC, its managing member, /s/ Aaron Weitman 08/14/2026 CastleKnight Management GP LLC By: Weitman Capital LLC, its managing member, /s/ Aaron Weitman 08/14/2026 Weitman Capital LLC /s/ Aaron Weitman 08/14/2026 Aaron Weitman /s/ Aaron Weitman 08/14/2026