Fortinet, Inc. FTNT

Key data

The business

Fortinet sells network security. The core product is the FortiGate firewall, an appliance built around Fortinet's own custom chip, a security processing unit that inspects traffic faster and cheaper than firewalls running on ordinary processors. Fortinet sells the box once, then sells the subscriptions that make it useful: FortiGuard threat feeds and support. Buyers are enterprises, governments and service providers, reached almost entirely through distributors. That concentration is real: one distributor, "Distributor A," is 27% of revenue, and the top three are more than half. The moat is the installed base. Once a company's network runs on FortiGate, renewals and add-on subscriptions pull through for years, and the custom silicon keeps the price per unit of throughput below rivals. The concrete thing a customer holds is a rack-mounted box with a Fortinet logo humming in a wiring closet, plus a yearly bill for the software that keeps it current.

The numbers

The sequence is the story. Growth was slowing into 2024, then reaccelerated hard as the refresh cycle arrived.

Revenue growth ran in the low-to-mid teens through 2024. It has since climbed every quarter, reaching 26% in the June quarter, the fastest in years, while diluted earnings per share went from $0.57 to $0.82. Fortinet has also beaten Wall Street's earnings estimate every quarter for a year, the June print by roughly 20%. The Q4 2025 line above is derived and foots to the reported full year.

Across five years revenue roughly doubled and earnings more than tripled, and the cash behind it is not an illusion: operating cash flow ran $2.59B last year against $1.85B of reported profit, and stock-based pay is under 4% of sales, unusually low for software because the hardware anchors the model. Remaining performance obligations, the contracted subscription backlog, stood at $7.73B in June, with deferred revenue up about 8% in six months, so the recurring base keeps building underneath the boxes. The variant is simple. The market prices Fortinet for a durable step up, but a 2020-2021 appliance surge refreshing on a five-year clock can pull demand forward and leave a hole behind it. What settles it is product revenue growth over the next two quarters: above 20% the step up is real, back to low teens and this was a bump.

The buyback runs hot in expensive years and stops in cheap ones, the opposite of what you would want.

Management

Ken Xie founded Fortinet, still runs it, and the custom-silicon bet is his. That is the reassuring part. The record on his own money is not. Insiders sold $69.8M over the last year across 31 sales and bought nothing, with Xie himself selling about $19M in early August and president John Whittle $11M in May. Plan status is not disclosed, so read the scheduled and discretionary sales as one lump until a Form 4 footnote splits them. Capital allocation is aggressive and price-insensitive: $2.29B of stock repurchased last year and $823M in the first half of 2026, at north of 50 times earnings, buying your own shares at a price that rewards the sellers as much as the holders. Guidance, at least, keeps getting beaten.

How it fails or surprises you

The refresh is a pull-forward, not a plateau. Growth reaccelerated because customers are replacing FortiGate boxes bought in the 2020-2021 surge. That is mechanical, and mechanical waves end. If product revenue growth rolls back to low teens by mid-2027, the 55x multiple has nothing to stand on. The first tell is product growth in the next two quarters.

Distributor A is 27% of revenue and 26% of accounts receivable. More than half of sales move through three distributors, and one alone carries 27%. A channel dispute, a distributor's own trouble, or a shift in buying terms hits the reported line before any demand signal does. Watch accounts receivable, where Distributor A alone is 26% of the balance.

Unified SASE and OT turn the box into a platform (right tail). The upside nobody is paying for is Fortinet's installed base becoming the on-ramp for its cloud security and factory-network products, lifting recurring revenue past 20% durably and enriching the mix. RPO at $7.73B already leads reported sales. The print is service revenue and RPO growth reaccelerating together.

Closing thoughts

The next two quarters will tell you whether this is a durable step-up or a temporary refresh bump. The evidence, accelerating revenue, record profit, a swelling subscription backlog and real cash, says the business is genuinely stronger than it was two years ago. The open question is durability, and the next two product-revenue prints answer it. The fatter tail is probably up over a multi-year hold, because the recurring base compounds even if hardware cools, but the near-term risk is concrete: pay 55x for 26% growth, watch that growth halve, and the multiple resets before earnings catch up. What is at risk if the refresh fades is the premium, not the company.

The bet is still that companies keep buying FortiGate boxes and that this replacement wave is lasting demand rather than borrowed-forward demand. It breaks if product revenue growth slides toward the low teens while the multiple still says 20-plus. The one pair to hold side by side each quarter is product revenue growth against the 55x you are paying. If product revenue growth prints below 15% in either of the next two quarters, the lasting-demand case is wrong.