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Simpson Thacher Stock Work Hurt Two Companies, Jury Told

Reported by Law360
Jul 28, 2026· 2 min read
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Key Takeaways
  • • Patriot National Inc. is suing Simpson Thacher & Bartlett LLP for legal malpractice, alleging the firm mishandled a securities offering that subsequently resulted in a material stock price decline for the company.
  • • A Florida jury heard testimony on July 28, 2026, from an insurance company CFO stating that Patriot National's stock drop had cascading negative effects on his own business, demonstrating potential broader market impact from the alleged securities offering defects.
  • • Simpson Thacher & Bartlett faces allegations of negligence in structuring the securities offering, with trial evidence suggesting inadequate due diligence or disclosure procedures that ultimately harmed shareholders and related business counterparties.
  • • The case illustrates litigation risk for major law firms in capital markets work, where securities offering failures can trigger malpractice claims with multi-company financial consequences.
Summary
Patriot National Inc. is pursuing a legal malpractice lawsuit against Simpson Thacher & Bartlett LLP over the firm's handling of a securities offering, with the case currently in trial in Florida. According to testimony presented on July 28, 2026, the plaintiff alleges that Simpson Thacher assembled a deficient securities offering that ultimately resulted in a significant stock price decline for Patriot National.

The scope of damages extends beyond Patriot National itself. During trial proceedings, the chief financial officer of an insurance company provided testimony describing how Patriot National's stock decline directly and materially impacted his own company's business operations and financial position. This testimony underscores the interconnected nature of modern capital markets, where a single securities offering failure can create ripple effects across multiple business entities and stakeholder groups.

The case centers on allegations that Simpson Thacher & Bartlett either failed to conduct adequate due diligence on the securities offering or inadequately disclosed material information to investors and market participants. The jury's consideration of damages that extend to third-party companies suggests the plaintiff's legal team is building a case for substantial losses flowing from the firm's alleged negligence in capital markets work. This litigation represents a notable example of malpractice risk that major law firms face when handling high-stakes securities offerings, where execution failures can trigger both direct shareholder losses and indirect business impacts on related entities.

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Law360 Simpson Thacher Stock Work Hurt Two Companies, Jury Told