F5 Investors Face Feb. 17 Deadline in Securities Suit Over 2025 Nation-State Breach

Investor filings focus on alleged misstatements following a breach that hit BIG-IP development, driving sharp share declines.

Overview

Smith v. F5, Inc., No. 25-cv-02619, is pending in the U.S. District Court for the Western District of Washington under the Securities Exchange Act of 1934.
The putative class period runs from October 28, 2024 through October 27, 2025, and no class has been certified.
The complaint alleges F5 concealed or downplayed an August 2025 nation-state intrusion that accessed BIG-IP development systems and downloaded files, including BIG-IP source code, according to filings.
F5’s October 15, 2025 disclosure of the intrusion was followed by a stock decline of nearly 14% over two trading days, as cited in the suit.
On October 27, 2025, F5 issued weaker fiscal-2026 guidance citing breach-related sales disruption and remediation costs, and the shares fell about 10.9% over the next two days, with multiple law firms urging investors to move for lead-plaintiff status by February 17, 2026.