Over the past year, market-manipulation lawsuits have become a growing feature of the securities litigation landscape, with plaintiffs targeting alleged spoofing, short-selling, pump-and-dump schemes, and other trading-related misconduct. The latest such case, filed on July 31, 2026, in the Middle District of Florida, names hedge fund Pentwater Capital Management and its founder, Matthew Halbower, as defendants (Pentwater SCA). The complaint alleges that they manipulated the market for Avis Budget Group (Avis) shares by orchestrating a short squeeze and then selling into the resulting price spike.
Unlike pump-and-dump securities suits premised on allegedly false or misleading statements, the Pentwater SCA is based on the defendants’ trading activity itself. The lawsuit arguably represents an example of a growing trend in market-manipulation-related securities class action litigation while underscoring an increasingly important issue for D&O underwriters: securities litigation risk arising not from disclosure deficiencies, but from market-structure and trading-related factors capable of driving extreme stock-price volatility.
A copy of the Pentwater SCA can be found here.
The Pentwater SCA
Plaintiff Khashayar Hakimian filed the Pentwater SCA against Pentwater Capital Management LP and its founder, Chief Executive Officer and Chief Investment Officer Matthew Halbower, on behalf of investors who purchased Avis securities between February 20, 2025, and April 21, 2026. The complaint alleges violations of Sections 9(a) and 10(b) of the Securities Exchange Act of 1934.
According to the complaint, Pentwater accumulated a massive economic interest in Avis during the first several months of 2026. By March 2026, Pentwater allegedly held an economic interest representing approximately 51% of the company through a combination of common stock holdings and cash-settled swaps. The complaint alleges that Pentwater continued purchasing Avis shares even as the company’s stock was subject to significant short interest.
The plaintiffs contend that Pentwater’s aggressive purchases helped create a classic short squeeze, forcing short sellers to buy shares to cover their positions and driving the stock price even higher. According to the complaint, Avis shares rose from approximately $147 per share on April 1, 2026, to an intraday high of $765.94 on April 21, 2026, despite what the complaint characterizes as disappointing business fundamentals. The complaint further alleges that after the stock reached its peak, Pentwater sold approximately 4.3 million shares on April 22 and April 23, generating roughly $1.75 billion in proceeds. According to the complaint, those sales contributed to a sharp decline in Avis’s share price, which fell more than 74% and closed at approximately $182 per share on April 28, 2026.
Notably, the plaintiffs rely, in part, on statements made by Avis. During the company’s April 29, 2026, earnings call, Avis CEO Brian Choi allegedly stated that Pentwater’s growing ownership position, combined with unusually high short interest in Avis shares, contributed to the short squeeze and that Pentwater’s subsequent sale of 4.3 million shares helped drive the stock’s decline.
The Pentwater SCA follows a separate dispute between Avis and Pentwater. In June 2026, Avis disclosed that Pentwater had agreed to pay $650 million to settle claims seeking recovery of alleged short-swing profits under Section 16(b) of the Exchange Act. The plaintiffs allege that Pentwater’s conduct constituted a market-manipulation scheme and seek damages on behalf of investors who allegedly suffered losses when the stock price later collapsed.
Discussion
By our count, the Pentwater SCA increases the number of market-manipulation-related securities class actions filed in 2026 to 14 and adds a new variation to the trading practices being challenged by plaintiffs. The lawsuit also reflects the growing willingness of plaintiffs to invoke Sections 9(a) and 10(b) of the Exchange Act to challenge allegedly manipulative trading activity as the source of investor harm.
In that respect, the case bears comparison both to the spoofing-related litigation involving Genius Group securities and to recent pump-and-dump and stock-promotion cases involving Megan Holdings, Ostin Technology, ChowChow Cloud, and other low-float issuers. Although the alleged misconduct varies, these cases reflect a common trend of plaintiffs invoking market-manipulation theories to explain stock-price distortions and investor losses.
The Pentwater SCA is distinctive because it focuses on an alleged short squeeze, a theory that has appeared only infrequently in securities litigation despite controversies involving Tesla “funding secured” statements, Overstock-related litigation, and the GameStop trading controversy. As with other market-manipulation claims, plaintiffs here will likely confront difficult questions involving intent, causation, and the distinction between lawful market activity and actionable manipulation.
The timing of the Pentwater SCA is also noteworthy. The day before the complaint was filed, Bloomberg Law reported that declining SEC enforcement activity may be elevating the role of private securities litigation in both investor compensation and securities-law enforcement. The report noted declines in SEC enforcement actions and investor distributions while observing that private securities class action recoveries continue to exceed SEC recoveries. Whether or not private litigants are actually filling perceived enforcement gaps, the Pentwater lawsuit arguably illustrates the phenomenon, as private plaintiffs have stepped forward to pursue claims arising from alleged trading activity that traditionally might have attracted greater regulatory attention.
Whether or not one accepts the proposition that private litigants are increasingly filling perceived enforcement gaps, the Pentwater SCA arguably illustrates the phenomenon. At least based on the public record, private plaintiffs, perhaps more so than regulators, have stepped forward this year to pursue claims arising out of alleged trading activity. The case adds another chapter to the recent wave of market-manipulation litigation and reflects plaintiffs’ continuing willingness to pursue novel theories involving trading activity, market structure, and price formation.
Another interesting aspect of the case is damages. As noted above, Pentwater previously agreed to pay $650 million to settle Avis’ Section 16(b) short-swing profit claims. Because Section 16(b) requires disgorgement of profits to the issuer rather than shareholders, the settlement does not necessarily preclude separate securities fraud or market-manipulation claims. Nevertheless, it may raise significant questions about whether shareholders can demonstrate damages distinct from the profits already recovered on the company’s behalf and whether any recovery sought in this action would be duplicative. Those issues could become important battlegrounds as the case proceeds.
From a D&O underwriting perspective, the case may be significant beyond its ultimate merits. Recent lawsuits involving spoofing, short squeezes, pump-and-dump schemes, and low-float issuers suggest that securities litigation increasingly can arise from trading dynamics themselves rather than solely from alleged disclosure failures. As a result, factors such as concentrated ownership, significant short interest, limited public float, and unusual trading activity may become increasingly relevant underwriting considerations.
Whether the Pentwater plaintiffs can overcome the challenges that have historically confronted market-manipulation claims remains to be seen. In addition to proving manipulation, they may face significant questions concerning causation and damages given the earlier Section 16(b) settlement. Nevertheless, the lawsuit may provide an important indication of how courts will approach short-squeeze-related securities claims and how D&O insurers may evaluate market-structure risks going forward.