Fastly Shares Surge Around 15% After Launching AI Firewall, Sparking Edge Security Rally

FSLY rose 14.92% to close at $27.42 on Monday, September 21, after launching an AI Firewall alongside AI Runtime Control and API Security products. The move spilled over to peers: NET climbed 7% to $346.22 and DDOG rose 5% to $241.33, even though neither had news of its own, per 24/7 Wall St.

The demand backdrop is real. Fastly says machine-generated traffic crossed 50% of its network in July and August, and AI traffic grew 6.5 times faster than human traffic from January through May. Its security segment grew 43% year over year to roughly $44 million last quarter, within total revenue of $183 million, up 23%. But the launch came with no named customers or contracts, and 24/7 Wall St. read the rally as a repricing of the whole edge-security category rather than a Fastly-specific fundamental change.

Two cautions sit alongside the move. TIKR reported that executives, including the CEO, CFO and CTO, sold about $6.08 million of stock between August 4 and September 17, before the launch. And the Street's mean price target of $27 is roughly where the stock now trades, while Insider Monkey noted hedge fund holders fell from 41 to 28 between Q1 and Q2.

The investor day in New York on September 22 is the next test. Management is expected to share multiproduct adoption data, and investors will look for evidence that the AI security products can convert into contracted revenue.