CastleKnight group discloses 5.9% ADV stake in Schedule 13G/A filing
CastleKnight Master Fund LP and related entities have filed an amended Schedule 13G/A, disclosing a 5.9% beneficial ownership stake in Advantage Solutions Inc. (ADV). As of August 14, 2026, the group beneficially owned 757,354 shares of Class A common stock, an increase from 581,347 …