F5, Inc. (FFIV)

How it makes money

Revenue splits across three lines: software (increasingly sold as term-based subscriptions rather than one-time licenses), systems (the physical BIG-IP appliances), and global services (support contracts and professional services tied to the installed base). Because the installed base is large and support renewals are recurring, roughly half of revenue comes from services rather than new sales, giving the business a steady, annuity-like component alongside lumpier hardware and software orders.

Revenue by segment

BIG-IP is wired into the core of a customer's network, handling traffic for critical applications; ripping it out means re-architecting how traffic reaches those applications, which enterprises avoid unless forced. That stickiness is being tested by cloud-native alternatives built into AWS, Azure and by rivals like Cloudflare and Akamai, which is why the advantage looks narrow rather than dominant today.

Demand tracks enterprise IT infrastructure budgets, which enterprises can delay but rarely cut to zero because the applications F5 protects keep running regardless of the economic cycle. Large deals bunch around refresh cycles and cloud migration projects, so quarterly revenue can be lumpy even though the underlying need for application delivery and security is fairly stable.

Key risks

• Nation-state breach of internal systems — F5 disclosed in October 2025 that a sophisticated nation-state actor had persistent, long-term access to its internal systems and exfiltrated files including BIG-IP source code, a serious blow to trust for a company whose entire business is securing other people's networks.
• Distributor concentration — Two distributors accounted for a third of fiscal 2025 revenue; losing or straining either relationship would disrupt a large share of order flow with little notice.
• Single contract manufacturer — F5 relies on Flex Ltd. to manufacture its hardware appliances; a disruption at that single supplier would directly limit how many systems F5 can ship.
• Competition from cloud-native and cloud-scale rivals — Akamai, Cloudflare, Cisco and the built-in traffic management tools of the major cloud providers all compete for the same application delivery and security spend, pressuring pricing and share.
• Execution risk in the shift to subscriptions and SaaS — F5 is moving customers from perpetual hardware and licenses toward recurring software and cloud offerings; a slower-than-planned transition would show up as weaker growth even as the underlying business stays healthy.

Top customers account for 33.3% of revenue

Two distribution partners together generated 33.3% of fiscal 2025 revenue. This is channel concentration rather than end-customer concentration, but it still means F5's near-term order flow depends heavily on the health of a couple of distributors.