Fastly Stock Is Up 145% In The Past Month: What's Driving The Action?

Fastly Inc (NASDAQ:FSLY) shares are moving higher Monday afternoon, up 145% over the past month, despite no company-specific news driving the session, as traders appear to continue reacting to the company's strong February earnings report. What do analysts think of FSLY stock? Here’s what investors need to know. Fastly Earnings Beat, AI Demand Driving Stock Momentum Last month, Fastly reported record fourth-quarter revenue of $172.6 million, up 23% year over year, while security revenue climbed 32%. The company also posted non-GAAP operating income of $21.2 million, compared with a loss in the prior-year period, and guided for full-year 2026 revenue of $700 million to $720 million. Management said AI is becoming an increasing tailwind for the business as demand grows for tools that help manage automated and AI-driven internet traffic. That earnings report helped fuel a sharp rally in the stock in recent weeks, and Monday's move suggests momentum has remained intact even without a fresh catalyst. Investors have also been focused on Fastly's positioning around AI-related infrastructure demand after CEO Kip Compton highlighted the company's transformation and improved growth profile. High Short Interest Adds Volatility To FSLY Stock Another factor that may be supporting volatility in Fastly is the stock's sizable short interest. Based on the market data shown, about 17.09 million shares were sold short, representing roughly 12% of the float. With Fastly trading near the upper end of its 52-week range, that elevated bearish positioning may be contributing to amplified upside moves as short sellers face pressure to cover. FSLY Trading Strongly Above Major Moving Averages Fastly shares have surged from roughly $5 at the low end of their 52-week range to above $20, with the stock on Monday pushing near its $21.27 high after last month's strong earnings report helped extend bullish momentum. The chart also shows Fastly trading well above its 20-day, 50-day and 200-day moving averages, reinforcing the view that the recent AI- and earnings-fueled rally has remained intact even without fresh company-specific news Monday. Benzinga Edge Rankings Benzinga Edge data shows Fastly has a Momentum score of 98.37, while its price trend remains bullish across the short-, medium- and long-term. FSLY Stock Gains Monday FSLY Price Action: Fastly shares were up 7.65% at $21.67 at the time of publication on Monday. The stock is trading near its 52-week high of $21.85, according to Benzinga Pro data. Image: Shutterstock