Fastly Surges 11%: The Comeback Is Real, but Insiders Have Been Selling the Whole Way Up

Core Viewpoint - Fastly (FSLY) has experienced a significant stock surge of 280% over the past year, with a recent 11% increase, driven by strong Q4 2025 earnings that exceeded expectations. However, insider selling raises concerns about the sustainability of this rally [1][4][5]. Financial Performance - Fastly reported Q4 2025 revenue of $172.61 million, surpassing the consensus estimate of $161.37 million by 6.97%, and reflecting a year-over-year growth of 22.79% [1][8]. - The company's non-GAAP operating income improved from a loss of $2.79 million in Q4 2024 to a profit of $21.23 million in Q4 2025, indicating a turnaround in profitability [1][8]. - Fastly's GAAP gross margin increased from 53.4% to 61.4% year-over-year, marking an 800 basis point improvement [9]. Growth Segments - Fastly's security revenue grew by 32% year-over-year to $35.4 million, now accounting for 20% of total revenue [10]. - The Compute and Observability segment saw a remarkable growth of 78% year-over-year to $6.4 million, indicating rapid acceleration in this area [11]. - The company's remaining performance obligations reached a record $353.8 million, up 55% year-over-year, suggesting strong future revenue visibility [11]. Future Guidance - For the full year 2026, Fastly's management has guided for revenue between $700 million and $720 million, with non-GAAP operating income projected at $50 million to $60 million [12]. Insider Selling - Despite the positive financial performance, Fastly insiders, including the CEO, CFO, and CTO, have been consistently selling shares throughout the stock's rally, raising questions about their confidence in the current valuation [2][5][13]. - The CTO has been particularly active, selling shares at prices ranging from $10.23 to $25 between December 2025 and March 2026 [14][15]. - The selling activity suggests that insiders may be converting their shares to cash, which could indicate a lack of confidence in the stock's future performance [16]. Market Sentiment - The consensus analyst target price for Fastly stock is $13.71, significantly lower than the current trading price, with a breakdown of 3 buys, 6 holds, and 1 strong sell [17]. - Fastly's stock has increased by 164% year-to-date, and while the profitability turnaround is genuine, the disparity between insider selling and stock price performance warrants careful consideration [19][20].