Avis Budget Group investors who purchased or acquired the company’s securities, including common stock bought to cover a short position, may seek appointment as lead plaintiff by September 29, 2026, in a proposed securities class action against Pentwater Capital Management LP and Matthew Halbower. Rosen Law Firm’s September 4 notice says Pentwater held an economic interest of approximately 51% of Avis through stock and cash-settled swaps as of March 2026, and alleges that aggressive purchases contributed to unusual volatility and a short squeeze. The existing record identifies the case as Hakimian v. Pentwater Capital Management LP, No. 26-cv-02275, filed in the U.S. District Court for the Middle District of Florida, and says Pentwater later sold 4.3 million Avis shares for $1.75 billion after the stock reached $847.70 on April 21, 2026. The notices contain conflicting class-period start dates: Rosen lists February 20, 2025, while the existing Robbins Geller notice specifies February 20, 2026; both end on April 21, 2026. No class has been certified, and investors can remain absent class members without seeking lead-plaintiff status.