1. F5 shares dropped 7.8% following disappointing Q4 2025 guidance. 2. Company cited cybersecurity breach in August 2025 as a significant factor. 3. Hagens Berman launched an investigation on F5’s disclosure practices. 4. F5’s 2026 growth guidance predicts only 0-4% revenue increase. 5. Cyber breach wipe out over $1.3 billion in shareholder value.
The significant drop in stock price and disappointing growth guidance indicate deep investor concerns. Historical trends show similar breaches have led to prolonged stock underperformance.
The investigation and drop in stock price highlight potential long-term risks affecting F5's performance and investor sentiment significantly.
The investigation and future revenue impacts from the breach may affect F5 over an extended period, as investor trust takes time to rebuild.
SAN FRANCISCO, Nov. 5, 2025 /PRNewswire/ -- Investors in multi-cloud application services provider F5, Inc. (NASDAQ:FFIV) saw the price of their shares slide $22.83 (-7.8%) on October 28, 2025 after the company reported its Q4 2025 results but provided disappointing guidance, which F5 in part attributed to a cybersecurity breach by foreign actors that it became aware of in August 2025.
The event and severe market reaction has prompted national shareholders rights firm Hagens Berman to open an investigation into whether F5 timely reported the breach to investors and its impact on the company's business. The firm urges F5 investors who suffered substantial losses to submit your losses now. The firm also encourages persons with knowledge who may be able to assist in the investigation to contact its attorneys.
Visit: www.hbsslaw.com/investor-fraud/ffiv
Contact the Firm Now: FFIV@hbsslaw.com
844-916-0895
F5, Inc. (FFIV) Investigation:
The investigation is focused on the timing and propriety of F5's disclosures about the sufficiency of its cybersecurity response plan and its effect on its business and growth prospects.
On October 15, 2025, F5 disclosed to investors that "[i]n August 2025, we learned a highly sophisticated nation-state threat actor maintained long-term, persistent access to, and downloaded files from, certain F5 systems." Following this disclosure, the price of F5 shares fell $47.82 (-13.9%) over the next two trading days.
The effects of the incident became clearer on October 27, 2025, after the company reported its Q4 and FY 2025 financial results. During the earnings call that day, F5 management guided for 2026 revenue growth of only 0% to 4% as compared to 2025 revenue growth of 10%.
Management largely attributed the steep deceleration as "based on what we see as potential near-term impact related to this security incident." Management also said "it would be natural that in some of our customers, at an executive level, we may see some delays of approvals or delays of deals or additional approvals, as customers across a complex organization make sure that they want to be reassured that their projects should move forward[.]"
This news sent the price of F5 shares sharply lower, wiping out over $1.3 billion of shareholder value on October 28, 2025.
"We're focused on when F5 determined that the August 2025 cybersecurity incident was material and whether the company timely informed investors consistent with the SEC's 4 business day rule and which might have predated the October 15 disclosure," said Reed Kathrein, the Hagens Berman partner leading the investigation.
If you invested in F5 and have substantial losses, or have knowledge that may assist the firm's investigation, submit your losses now »
If you'd like more information and answers to frequently asked questions about the F5 investigation, read more »
Whistleblowers: Persons with non-public information regarding F5 should consider their options to help in the investigation or take advantage of the SEC Whistleblower program. Under the new program, whistleblowers who provide original information may receive rewards totaling up to 30 percent of any successful recovery made by the SEC. For more information, call Reed Kathrein at 844-916-0895 or email FFIV@hbsslaw.com.
About Hagens Berman
Hagens Berman is a global plaintiffs' rights complex litigation firm focusing on corporate accountability. The firm is home to a robust practice and represents investors as well as whistleblowers, workers, consumers and others in cases achieving real results for those harmed by corporate negligence and other wrongdoings. Hagens Berman's team has secured more than $2.9 billion in this area of law. More about the firm and its successes can be found at hbsslaw.com. Follow the firm for updates and news at @ClassActionLaw.
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SOURCE Hagens Berman Sobol Shapiro LLP