Overview

A class action lawsuit has been filed against F5, Inc. (“F5” or the “Company”) (NASDAQ : FFIV) and certain of the Company’s senior executive officers alleging violations of the federal securities laws. The F5 lawsuit is brought on behalf of all persons and entities who purchased or otherwise acquired F5 securities between October 28, 2024 and October 27, 2025, both dates inclusive (the “Class Period”). Investors have until February 17, 2026, to seek appointment as lead plaintiff of the F5 class action lawsuit.

F5 is a global multicloud application security and delivery company which enables customers to deploy, secure, and operate applications on-premises or via public cloud. The Company operates through three major product portfolios: F5 Distributed Cloud Services, F5 NGINX, and F5 BIG-IP.

The complaint alleges that Defendants made false and misleading statements and omissions of material fact regarding the true state of F5’s security capabilities.  Specifically, Defendants concealed that the Company was not truly equipped to safely secure data for its clients as F5 itself was, at all relevant times, experiencing a significant security breach (the “Security Breach”) of some of its key offerings. According to the lawsuit, these statements and omissions caused investors to purchase F5’s securities at artificially inflated prices.

The truth started to come out on October 15, 2025, when Defendants revealed a “long-term, persistent” breach to F5’s systems, during which the Company’s BIG-IP product development and engineering knowledge management platforms were compromised, including the BIG-IP source code.

On this news, the price of F5’s common stock declined dramatically. Specifically, the Company’s stock price fell from a closing price of $343.17 per share on October 14, 2025 to $295.35 per share on October 16, 2025, a decline of nearly 14%.

Then, on October 27, 2025, F5 announced significantly below-market growth expectations for fiscal 2026 due in significant part to the Security Breach as the Company announced expected reductions to sales and renewals, elongated sales cycles, terminated projections, and increased expenses attributed to ongoing remediation efforts. Defendants further disclosed that BIG-IP, the product that was the subject of the Security Breach, is the Company’s highest revenue product.  On this news, the price of F5’s common stock fell $31.65 per share, a decline of nearly 11%.

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If you purchased or otherwise acquired F5 securities between October 28, 2024 and October 27, 2025, and you wish to serve as lead plaintiff in this lawsuit, you are encouraged to submit your information to DiCello Levitt LLP via the form on this page. 

You can also contact DiCello Levitt partner Brian O’Mara by calling (888) 287-9005 or at investors@dicellolevitt.com. 

The deadline to apply to the Court to serve as a lead plaintiff in the F5 class action lawsuit is February 17, 2026.