Fortinet Is Down 28% YTD, But Its Free Cash Flow Just Hit a Record $2.21 Billion

A popular name in the Cybersecurity world, Fortinet (NASDAQ:FTNT) shares are trading at $77 as of February 25, down 28% from a year ago, and it should go without saying that the business case for optimism is harder to dismiss than the stock chart suggests.

The Q4 2025 earnings call delivered numbers that reframe the narrative. Full-year 2025 free cash flow hit a record $2.21 billion, billings grew 16% to $7.55 billion, and non-GAAP operating margin came in at 35.5%. That marks Fortinet’s sixth consecutive year exceeding the “Rule of 45,” where revenue growth rate plus operating margin exceeds 45. Management is guiding for a seventh straight year in 2026.

Fortinet’s SASE Surge Is the Real Story

Currently, the segment attracting the most attention is Unified SASE, where billings grew 40% in Q4, and FortiSASE ARR increased by more than 90%. CEO Ken Xie has been direct about why: Fortinet is the only major vendor offering Sovereign SASE, an on-premises deployment option for enterprises. “We have probably doubled the total addressable market in the SASE market with Sovereign SASE,” Xie said on the earnings call. The adoption data backs a real acceleration.

Buyback Math and the Insider Wrinkle

The board authorized a $1 billion expansion of the share repurchase program in January 2026, leaving roughly $1.4 billion in remaining authorization. With $2.21 billion in annual free cash flow, the capacity is real. CFO Christiane Ohlgart called it “a disciplined shareholder-focused capital allocation strategy.” The complicating detail: CEO Ken Xie and CTO Michael Xie sold a combined ~$47 million in shares in early February, though both were exercising options originally granted at $16.90. That makes it a tax-efficient move rather than a clear confidence signal either way.

Three tensions investors are working through:

• Q1 2026 operating margin guidance of 30%-32% steps down from Q4’s 37.3%, reflecting planned infrastructure investment
• A recent AI-assisted breach of 600+ FortiGate firewalls across 55 countries raised product vulnerability questions
• Freedom Capital Markets downgraded FTNT from Buy to Hold on February 18, citing valuation and margin pressure

Fortinet’s 2026 guidance calls for $8.4-$8.6 billion in billings and $7.5-$7.7 billion in revenue, reflecting a business still compounding at scale, with SASE momentum and margin trajectory as the key variables analysts are watching.