Fastly, Inc. NASDAQ:FSLY doesn't just move data; it acts as the internet's traffic controller. Most people think of it as a Content Delivery Network that makes websites load faster, but that view is outdated. It is now a security and compute platform where code runs at the edge. The company sits between a server and a user, making split-second decisions about which traffic is legitimate and which is a malicious bot. After years of burning cash to build this infrastructure, Fastly has finally hit a tipping point where its high-margin services are growing faster than its basic delivery business.
Potential Bull Cases
1. Platform Consolidation Drives High Switching Costs
Customers are ditching the patchwork stacks. A dozen different security and delivery vendors create a nightmare of complexity. In the second quarter of 2026, Fastly reported a net retention rate of 117%. This marks its highest level in three years. This means existing customers spent $1.17 for every dollar they spent last year. They aren't just staying; they are buying more. As it integrates security, compute, and delivery into one control plane, it builds a switching cost moat. Once a developer weaves custom edge functions into their traffic flow, moving to a rival becomes a massive rebuilding project.
2. Exploiting the Explosion in Artificial Intelligence Traffic
Machine traffic is rewriting the rules of the internet. AI agents and scrapers browse roughly six times faster than humans do. This creates a surge of complex requests that traditional data centers can't handle efficiently. Each machine request requires an immediate decision. The system must block, throttle, or monetize the bot. Management reported that security and compute revenue grew 46% year over year. These machine interactions require heavy processing at the edge. By acting as the trusted control plane for automated commerce, the company captures value from the explosion of agentic traffic that bypasses traditional human web interfaces.
3. Security Expansion Transforms the Revenue Mix
The company is successfully shedding its commodity delivery label. Security revenue reached nearly $42 million in the second quarter. This is a 43% jump from the previous year. This segment now accounts for nearly a quarter of the total business. High-value tools like bot management and DDoS protection grew at triple-digit rates as enterprises looked to defend against increasingly sophisticated automated attacks. This shift matters because security carries higher margins and stickier contracts than basic content delivery. The product mix is finally evolving into a high-value software suite. This evolution fundamentally changes the long-term earnings potential of the business.
4. Operational Leverage Delivers Record Margin Performance
Management has finally proven that the platform can scale profitably. Fastly reached a record non-GAAP gross margin of nearly 66% in the second quarter of 2026. It managed this while raising its full-year operating profit guidance to a range of $88 million to $96 million. This is a dramatic shift from 2025. In Q2 2025, the non-GAAP gross margin sat at 59%. The infrastructure is now large enough that incremental revenue drops straight to the bottom line. It recorded an incremental operating margin flow-through of 79% over the last 12 months. The business model is finally delivering the leverage investors have long waited for.
5. Sustainable Free Cash Flow Generation Provides Independence
Fastly has transitioned into a self-funding growth machine. It just delivered its sixth consecutive quarter of positive free cash flow. This result proves it no longer needs to rely on capital markets to survive. Management expects to generate $40 million to $50 million in free cash flow for the full year of 2026. This financial independence allows the company to invest aggressively in its network during a period of supply chain constraints. It ended the second quarter with a positive net cash balance of $14 million. This stability provides a floor for the valuation and ensures it can weather temporary macro storms.
Potential Bear Cases
1. Revenue Concentration Among Top Customers Creates Fragility
The top line is increasingly dependent on a handful of giants. In the second quarter of 2026, the top 10 customers accounted for 37% of total revenue. This concentration is a significant jump from 31% a year ago. Even more concerning is that one single customer entity now represents 11% of the total business. While these large accounts grew at a blistering 48% rate, their dominance makes the results fragile. If one major streaming client moves traffic to a cheaper rival or builds its own infrastructure, it creates a hole. The rest of the portfolio cannot easily fill such a gap.
2. Capital Intensity Pressure From Infrastructure Upgrades
The cost of staying competitive is rising as traffic volumes explode. Infrastructure capital expenditures hit 17% of revenue in the second quarter. This is a sharp increase from the 5% level seen in full-year 2025. Management had to front-load this spending to secure equipment amid tight supply chains for memory and server components. While it claims this spend will moderate, the reality is that maintaining a global edge network requires constant upgrades. As AI traffic demands more compute power, the capital intensity of the business could remain elevated. This constant need for new hardware eats into the cash available for shareholders.
3. Slow New Logo Acquisition Outside of Large Accounts
The company is struggling to find growth outside of its existing fan base. While the top 10 customers are expanding rapidly, revenue from everyone else grew only 12% year over year in the second quarter. This is a significant deceleration from the previous quarter. New logo growth is clearly lagging. This suggests the company's sales transformation is still a work in progress. Management recently brought on a new chief marketing officer and is shifting the strategy to target mid-market logos. However, the results haven't shown up in the numbers yet. Without a broader base of customers, the company remains trapped.
The Moneyball Verdict: 74 out of 100
Our proprietary Moneyball scoring system assigns Fastly an overall Superscore of 74 out of 100, placing it in the Above Average category. The Superscore is an AI-powered score that evaluates a company's overall strength by combining financial performance, product market position, technological capabilities, leadership quality, and relative valuation. It represents the unification of all our scores into a single score for public companies, with five rating bands: Exceptional (90-100), Strong (75-89), Above Average (60-74), Average (40-59), and Cautious (0-39). This score places the company in the Top ~23% of all companies we score, or ahead of roughly 77 out of every 100 companies in our database.
Fastly is finally turning its infrastructure scale into record gross margins, and this Above Average view aligns with that fundamental shift toward high-margin security services. This lean also acknowledges the fragility of a narrow customer base. If management can't accelerate new logo growth, the business remains a high-stakes bet on the continued loyalty of just a few giant clients.