Fastly (FSLY) Stock Surges to 4-Year High Near $28 Amid AI Momentum and Strong Q4 Results

Shares of Fastly, Inc. (NYSE: FSLY) soared to a four-year high in recent trading sessions, climbing more than 13% intraday on March 23, 2026, as the edge cloud platform provider rode continued enthusiasm for its AI-driven growth prospects and robust fourth-quarter 2025 performance.

Fastly’s stock opened around $25.21 and reached as high as $28.65 during the session, marking its strongest level since early 2022. The rally extended a remarkable turnaround for the company, with shares up over 180% year-to-date and more than 300% over the past 12 months. The surge has pushed the market capitalization above $4 billion, reflecting renewed investor confidence in Fastly’s edge computing and content delivery network services amid booming demand for low-latency AI applications.

The momentum traces primarily to Fastly’s February 11, 2026, earnings report, which delivered record results for the fourth quarter and full year 2025. Revenue hit $172.6 million, up 23% year-over-year, surpassing analyst expectations. Non-GAAP earnings per share came in at $0.12, beating estimates by $0.06, while gross margins reached a record 61.4% (non-GAAP 64.0%). Executives highlighted strong growth in network services (19%) and security offerings (32%), crediting AI tailwinds for accelerating adoption.

Guidance for 2026 reinforced optimism, with the company projecting full-year revenue of $700 million to $720 million and non-GAAP operating income of $50 million to $60 million. First-quarter 2026 outlook called for revenue of $168 million to $174 million and non-GAAP EPS of $0.07 to $0.10. Analysts responded positively, with price target increases including RBC Capital lifting its target to $20 from $12 in early March and others following suit.

“Fastly is benefiting from the AI infrastructure buildout, where edge computing reduces latency for real-time applications like generative AI inference and content personalization,” one analyst noted in a post-earnings note. The company’s platform enables faster data processing closer to users, a key advantage as enterprises scale AI workloads.

Recent partnerships and deals added fuel. Reports highlighted a new agreement with a Dublin-based firm, contributing to the stock’s push toward multi-year highs. Fastly’s focus on compute@edge capabilities has positioned it well against competitors like Cloudflare and Akamai in the evolving CDN landscape.

However, the rally has not been without cautionary signals. Insider selling has persisted throughout the upswing, with executives including CTO Artur Bergman executing dozens of transactions from late 2025 into March 2026. Bergman sold shares across a wide price range, starting near $10 and continuing up to around $25. Other top officers, including the CEO and CFO, have also offloaded stock, prompting questions about whether insiders view the valuation as stretched.

On March 4, President of Go-to-Market Scott Lovett sold 73,715 shares for approximately $1.55 million at an average price of $21.06. While such sales often occur for personal reasons like diversification or tax planning, the volume amid the rally has drawn scrutiny from some investors.

The stock’s rapid ascent has also sparked valuation debates. Trading at forward price-to-sales multiples around 5-6x, Fastly appears expensive relative to historical norms and peers, especially given ongoing net losses (trailing EPS around -$0.83). Analysts’ consensus one-year price target hovers near $13-20 in some reports, well below recent levels, suggesting potential overextension.

Broader market dynamics play a role. Amid geopolitical tensions and oil price volatility impacting tech sentiment, Fastly has bucked trends, benefiting from AI sector enthusiasm. Nvidia’s investments in related cloud players have lifted sentiment for edge and AI infrastructure names.

Fastly’s convertible notes due March 2026 matured mid-month, with discussions around repayment or conversion adding short-term overhang before the rally resumed. The company managed the maturity without major disruption, supporting operational continuity.

Looking ahead, Fastly’s next earnings are expected in early May 2026 for the first quarter. Investors will watch for sustained AI-driven revenue acceleration and margin expansion. The company continues investing in product innovation, including enhanced security and compute features to capitalize on edge trends.

Despite the impressive run, questions linger about sustainability. Insider activity and elevated multiples suggest caution, even as fundamentals improve. Fastly’s transformation from post-pandemic struggles to AI beneficiary has captivated the market, but maintaining momentum will require consistent execution in a competitive field.

As trading continues on March 24, 2026, Fastly remains one of the standout performers in cloud infrastructure, with its stock reflecting both excitement over growth prospects and the risks of a momentum-driven surge.