F5 Investors Pressed to Join Securities Suit as Lead‑Plaintiff Deadline Nears

The case centers on October disclosures about a BIG‑IP development breach that coincided with a weaker 2026 outlook.

Overview

Multiple plaintiff firms, including Hagens Berman, Rosen, Kahn Swick & Foti, Howard G. Smith, Faruqi & Faruqi, and Kuehn Law, issued new notices on January 16–17 urging investors to act before the February 17, 2026 deadline.
A federal securities class action is pending in the Western District of Washington as Smith v. F5, Inc., et al., No. 25‑cv‑02619, with no class certified and the allegations unproven.
The putative class period spans October 28, 2024 through October 27, 2025 for purchasers of F5 securities.
Company disclosures state investigators identified a cybersecurity incident on August 9, 2025, followed by an October 15 update revealing access to BIG‑IP engineering systems and source‑code exfiltration.
On October 27, 2025 F5 guided fiscal 2026 revenue growth to 0%–4% citing breach‑related sales disruption, and the stock fell sharply across the October disclosures, including declines of about 10% after October 15 and about 11% over two days after October 27.