---
schema_version: "secwatch.filing_event.v1"
accession: "0001048695-25-000149"
form_type: "8-K"
ticker: "FFIV"
cik: "0001048695"
company_name: "F5, INC."
filed_at: "2025-10-15T23:59:59+00:00"
generated_at: "2026-05-17T03:40:43.110413+00:00"
event_type: "cyber"
sentiment: "negative"
materiality_score: 0.75
calibrated_materiality_score: 0.75
confidence: "high"
source: SEC EDGAR
---

# F5 discloses nation-state cyber breach; BIG-IP source code exfiltrated; director resigns for new role

## Summary
- Nation-state threat actor exfiltrated BIG-IP source code and undisclosed vulnerability details; access since August 2025.
- No evidence of active exploitation or software supply chain modification; containment efforts successful.
- Configuration or implementation info for a small % of customers exfiltrated; affected customers will be contacted.
- Director Michael Montoya resigned from board (no disagreement), appointed Chief Technology Operations Officer, reporting to CEO.
- F5 released security updates for BIG-IP, F5OS, BIG-IP Next, BIG-IQ, and APM clients; customers advised to update.

## SEC filing metadata
- accession: 0001048695-25-000149
- form_type: 8-K
- ticker: FFIV
- cik: 0001048695
- company_name: F5, INC.
- filed_at: 2025-10-15T23:59:59+00:00
- event_type: cyber
- sentiment: negative
- materiality_score: 0.75
- calibrated_materiality_score: 0.75
- confidence: high
- sec_items: 1.05, 5.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1048695/000104869525000149/0001048695-25-000149-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1048695/000104869525000149/ffiv-20251015.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001048695-25-000149
- JSON: https://secwatch.observer/filing/0001048695-25-000149.json
- Plain text: https://secwatch.observer/filing/0001048695-25-000149.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.