[FSLY] Fastly, Inc.: Can Customer Quality and Cash Catch Up?

Fastly's Q2 2026 results looked like a turnaround: 23% revenue growth, 63.3% GAAP gross margin and 43% security growth. Yet customer breadth and cash conversion were less decisive. Net retention reached 117%, but large customers totaled 624 and the top ten supplied 37% of revenue. Operating cash flow was $39.334 million, while infrastructure and software investment left only $3.573 million of free cash flow. [3][4][5]

Company Background and Business Structure

Fastly provides a programmable edge-cloud platform for content and application delivery, security and edge compute. Revenue is mainly sensitive to customer usage. That allows large-customer traffic to enter results quickly, but it also exposes quarterly revenue to live events, volume-tier pricing and changes in customer activity.

Q2 revenue was reported as Network Services, Security and Other: $133.9 million, $41.7 million and $7.7 million. [3] Network services supply the traffic base; DDoS, WAF and bot products deepen security adoption; Other includes early compute products. All share infrastructure, so utilization and product mix jointly determine margin.

Financial History and Current Position

FY2025 revenue was $624.0 million, up 15%. Gross profit reached $356.2 million and GAAP gross margin 57.1%, while GAAP operating loss remained $117.8 million and net loss $121.7 million. Operating cash flow was $94.0 million. Property and equipment spending was $28.7 million and capitalized software was $17.7 million. [1][2]

Q2 2026 revenue was $183.3 million, up 23%. Security grew 43%, Network Services 17% and Other 69%, while GAAP gross margin reached 63.3%. [3] GAAP net loss narrowed to $15.6 million. Operating cash flow was $39.334 million, but $35.761 million of capital investment left $3.573 million of free cash flow—not $36 million. [4]

Customer data were mixed. LTM net retention was 117%, large customers numbered 624, and RPO was $341 million. The top ten represented 37% of revenue, up from 31% a year earlier; their revenue grew 48%, versus 12% outside the top ten. [5]

Operating Model

Revenue can be framed as prior customer revenue multiplied by net retention, plus new-customer revenue. Traffic, product count and tiered pricing drive existing-account expansion. New logos and movement above the $100,000 annualized large-customer threshold determine breadth.

Gross profit reflects usage revenue less bandwidth, colocation, server depreciation and support cost. Faster security and compute growth can raise wallet share and spread fixed network cost. Higher compute intensity, capacity additions or price erosion can offset that benefit.

Cash requires a separate bridge. Servers, network equipment and capitalized internal software are necessary to maintain and expand the platform. In Q2, those investments absorbed 91% of operating cash flow. [4]

Core Debates

Does 117% retention represent broad expansion or greater concentration?

Net retention confirms that the installed base expanded, but it does not reveal how many customers drove the result. With 624 large customers, 37% top-ten concentration and only 12% growth outside the top ten, the quarter still depended disproportionately on a small group. [5]

Confirmation requires retention above roughly 115%, renewed large-customer growth and a narrowing gap between top-ten and other-customer growth. Concentration above 40%, or falling large-customer count alongside higher NRR, would weaken the quality of expansion.

Can security lift margin without weakening the network base?

Security revenue was $41.7 million, 22.7% of total revenue, and grew 43%. Network Services remained almost three quarters of the business and grew 17%. [3] Mix improves only if security gains are incremental rather than a consequence of a shrinking network base.

GAAP gross margin of 63.3% is the financial test. Management's Q3 range centers on 65%, plus or minus 50 basis points. [5] Security staying above company growth, network revenue remaining in double digits and GAAP margin improving together would validate the model.

Can operating improvement survive infrastructure spending?

Q2 operating cash flow was $39.334 million, but free cash flow was only $3.573 million, below $10.911 million a year earlier. [4] Management maintained a $40 million to $50 million FY2026 free-cash-flow plan and infrastructure investment of 10% to 12% of revenue. [5]

The Q2 investment rate was about 19.5%, making the front-loading explanation testable. Investment should fall toward the annual range without impairing growth, while cumulative free cash flow advances toward the full-year plan. Persistent high investment with weak free cash flow would leave the turnaround incomplete.

Industry and Competitive Position

Fastly competes with Cloudflare, Akamai, cloud-native networking and security products, and other edge platforms. Its strengths are programmability, real-time configuration and performance-sensitive delivery. Its constraints are smaller scale, customer concentration, consumption volatility and continuing traffic-price pressure.

Security can improve its position by expanding customer relationships from delivery into protection and platform consolidation. Q2 provides evidence of that motion, but the growth gap between the top ten and everyone else shows that breadth remains unproved.

Risks and Falsifiers

• Top-ten concentration above 40% with falling large-customer count would undermine the breadth implied by NRR.
• Security growth below the company average, paired with lower retention, would weaken the cross-sell mechanism.
• More event-driven traffic or price erosion could make quarterly growth less repeatable.
• A failure of the investment rate to normalize, or a cut to full-year cash guidance, would show that margin gains are not reaching cash.

What to Watch Next

Watch 117% NRR, 624 large customers and 37% top-ten concentration as one set. Connect $41.7 million of security revenue and $133.9 million of Network Services revenue to GAAP gross margin. Finally, compare operating cash flow and infrastructure investment with the $40 million to $50 million annual free-cash-flow plan. No single adjusted earnings number resolves all three questions.

Conclusion

Fastly has crossed the first tests of renewed revenue growth and gross-margin repair. It has not yet passed the tests of customer breadth and cash conversion. Q2's 23% growth, 43% security expansion and 63.3% GAAP margin are real improvements; 624 large customers, 37% concentration and $3.573 million of free cash flow keep the operating case conditional. [3][4][5]

TradingKey reached a similar two-sided conclusion after the release: revenue rose with little change in cost of revenue, expanding gross margin and narrowing GAAP losses, while free cash flow declined. [6] The next proof is joint movement—growth spreading beyond the top ten, security lifting GAAP economics, and lower front-loaded investment allowing operating cash to reach free cash flow.