A10 Networks reported first quarter 2026 revenue of $75 million, up 13.4% year-over-year, its third quarter of double-digit growth in the last four, with trailing-twelve-month revenue growth of 12.1% and TTM Adjusted EBITDA margins of 29.7%, consistent with its rule-of-40 target. Product revenue was the standout, rising 22.3% to $44 million (59% of total) on security-led demand, with service revenue making up the remainder. Growth was propelled by AI infrastructure build-outs, including selection as a technology partner on one of the industry's most significant AI build-outs, where a single customer represented a high percentage of total revenue for the quarter. Enterprise customers were 56% of revenue and service providers 44%, with the Americas at 67% of global revenue. Profitability held with non-GAAP gross margin of 80.6%, operating margin of 25.2%, net income of $17.7 million ($0.25 basic/$0.24 diluted), and Adjusted EBITDA of $22.5 million or 30% of revenue. Operating and free cash flow were temporarily pressured by receivables timing and inventory investments that management expects to normalize over the year. The company returned $6.8 million to shareholders via dividends and buybacks and reiterated its 2026 outlook of 10%-12% revenue growth, 28%-30% Adjusted EBITDA margins, and 12%-14% EPS growth.
Thank you, and thank you all for joining us today. This call is being recorded and webcast live and may be accessed for at least 90 days via the A10 Networks website at a10networks.com. Hosting the call today are Dhrupad Trivedi, A10's President and CEO and CFO Michelle Caron. Before we begin, I would like to remind you that shortly after the market closed today, A10 Networks issued a press release announcing its first quarter 2026 financial results. Additionally, A10 published a presentation and supplemental trended financial statements. You may access the press release, presentation, and trended financial statements on the investor relations section of the company's website.
During the course of today's call, management will make forward-looking statements, including statements regarding projections for future operating results, demand, industry and customer trends, macroeconomic factors, strategy, potential new products and solutions, our capital allocation strategy, profitability, expenses and investments, positioning, and our dividend program. These statements are based on current expectations and beliefs as of today, April 28, 2026. These forward-looking statements involve a number of risks and uncertainties, some of which are beyond our control, that could cause actual results to differ materially, and you should not rely on them as predictions of future events. A10 does not intend to update information contained in these forward-looking statements, whether as a result of new information, future events, or otherwise, unless required by law. For a more detailed description of these risks and uncertainties, please refer to our most recent 10-K and quarterly report on form 10-Q.
Please note that with the exception of revenue, financial measures discussed today are on a non-GAAP basis, unless otherwise noted, and have been adjusted to exclude certain charges. The non-GAAP financial measures are not intended to be considered in isolation or as a substitute for results prepared in accordance with GAAP and may be different from non-GAAP measures presented by other companies. A reconciliation between GAAP and non-GAAP measures can be found in the press release issued today and on the trended quarterly financial statements posted on the company's website at a10networks.com. Now I'd like to turn the call over to Dhrupad , President and CEO of A10 Networks.
Thank you, Tom, and thank you all for joining us today. A10 continued to deliver on our strategic plan centered around the current AI-driven demand cycle while simultaneously focusing on disciplined execution. Our customers are seeking solutions to address two major challenges: accelerating traffic volume and complexity and emerging security threats in the rapidly evolving AI landscape. A10 is well-positioned to address both these challenges. We delivered 13.4% revenue growth in the first quarter. This was our third quarter in the last four with double-digit growth. On a trailing twelve-month basis, we have grown revenue by 12.1% and delivered TTM Adjusted EBITDA margins of 29.7%, in line with the rule of 40 we outlined several years ago.
During the same period, we have grown service provider revenue by 11% and enterprise revenue by 13%, demonstrating the importance of the strategic shift we have made. A key contributor to our growth is the relevance of our core platform to the demands of AI infrastructure build-out, which create new challenges with greater traffic within the networks. As a result, traffic management is returning to the forefront of build-out plans, and this trend is aligned with A10's history and core expertise. Second, AI is evolving rapidly, creating new threats and expanding the footprint of security concerns. For most of the last decade, A10 has prioritized security advancement in each of our solutions. During this period, we have built a security portfolio that is now directly in the path of AI-driven threat expansion.
This quarter, we were selected as a technology partner for a new application at one of the most significant AI infrastructure build-outs in our industry. As a result, the customer behind this build-out represents a high percent of total revenue this quarter. The expansion of the customer's commitment to their enterprise applications reflects our focus on and relevance of next-generation networking. Deployments of this scale are time-sensitive and technically demanding, and it required prioritized allocation of product, inventory, and engineering resources. This was a deliberate choice to support a strategic customer and partner through a time-sensitive deployment window. We believe capturing this opportunity at the right cadence creates long-term value for the business. I also want to highlight a dynamic I believe is increasingly important to our story. AI is transforming the distinction between how large enterprises and service providers build their networks.
The workloads are the same, the performance demands are the same, and security requirements are the same. What this means practically is that a Fortune founded customer standing up an internal AI cluster is now evaluating the same architectural choices as a cloud provider. A service provider hosting AI workloads for their enterprise tenants is being held to the same standard as its customers' own data centers. We have built our platform for exactly this world. One architecture, one operating model, one security framework across both segments. That is a meaningful competitive advantage as this convergence accelerates driven by AI. Our disciplined operating model balances targeted investment with margin expansion, converting growth into profitability and cash, while dynamically reinvesting in strategic priorities. We continue to meet our objectives for EBITDA margin, reflecting our ability to reallocate resources based on best business opportunities. This results in consistent revenue and EPS performance.
With that, I'd like to turn the call over to Michelle Caron, our Chief Financial Officer, to review the numbers in more detail. Michelle.
Thank you, Dhrupad. As a reminder, with the exception of revenue, all of the metrics discussed on this call are a non-GAAP basis unless otherwise stated. A full reconciliation of GAAP to non-GAAP results are provided in our press release and on our website. Let me turn to the results. As Dhrupad noted, Q1 results were aligned with our business model goals and delivered revenue growth of 13.4% to $75 million. Turning to mix, product revenue was $44 million or 59% of total revenue, growing 22.3% year-over-year, with service revenue comprising the remainder. Security-led revenue was a strong driver of our product revenue growth and continues to meet or exceed our long-term goal of security-led revenue as a percentage of total revenue. Security remains the dominant revenue driver across our NextGen Networking legacy networking, and network security solution areas.
Turning to our major verticals, enterprise customers represented 56% of Q1 revenues, with Americas continuing to outpace overall enterprise revenue growth. While first quarter benefited from timing of large orders, this segment continues to grow above company average in terms of results as well as outlooks. Enterprise momentum reflects the combination of our focus on this segment, as well as continued strong demand for our NextGen Networking solutions as customers prioritize modernizing their infrastructure. Our customers across both segments are aligning on the same underlying requirements for performance, security, and scale. From a financial lens, this convergence is showing up in larger opportunities with our enterprise customers. Service provider revenue was 44% of total revenue in the first quarter. Both verticals align with our strategy and reflect the alignment of our offerings with AI infrastructure build-outs.
A10 has evolved its solutions to be well-positioned to capture this NextGen Networking demand while also addressing legacy refresh opportunities as this market transition progresses and customers resume investment while continuing to align their evolving priorities around performance, scale, and security. From a geographical perspective, our Americas region represented 67% of global revenue, driven by continued investment in AI infrastructure build-outs. In EMEA, we saw headwinds related to regional conflicts. In APJ, spending remains conservative as customers navigate an uncertain capital environment. We're not losing market share or experiencing competitive displacement, rather, customers are extending asset lives and deferring discretionary spend. Q1 operating results reflected our continued investment in our strategic initiatives as well as our financial discipline amidst temporary input cost pressures. non-GAAP gross margin was 80.6%, in line with our stated goals.
Operating expenses were $41.5 million as we prioritized investments in AI-facing innovation, NextGen Networking, and security. Operating margin was 25.2%, resulting in net income of $17.7 million or $0.25 per basic and $0.24 per diluted share. Q1 diluted weighted share count was 72.9 million shares. Operating cash flow, and therefore free cash flow in the quarter, was temporarily impacted by the timing of receivables as well as inventory investments. Neither item reflects a change in underlying business fundamentals. We expect both to normalize over the course of the year. Full year free cash flow expectations remain unchanged, expanding on a year-over-year basis. Adjusted EBITDA was $22.5 million, 30% of revenue, consistent with our business model goals as we balance investment and growth initiatives with our commitments to sustained and expanding profitability.
Turning to the balance sheet, cash and marketable securities were $369.7 million as of March 31st, and deferred revenue was $147.2 million. During the quarter, we paid $4.3 million in cash dividends and repurchased $2.5 million worth of shares, returning a total of $6.8 million to our shareholders. The board has approved a quarterly cash dividend of $0.06 per share to be paid on June 1st, 2026, to shareholders of record on May 15th, 2026. The company has $53.4 million remaining on its $75 million share repurchase authorization. As is true for everyone in the industry, we are seeing delivery and cost challenges related to pricing of certain components.
We entered this environment with strong supplier relationships, and we will keep evaluating the evolving market and adapt as needed. I'll now turn the call back over to Dhrupad for an update on our 2026 outlook and closing comments.
Thank you, Michelle. A10 continues to strengthen its position as a partner of choice to address the evolving traffic and security needs of next-generation networks. The strong financial results, including double-digit growth and solid EBITDA margins, validate the strategic investments we have made. As a result, A10 is well-positioned in front of multiple durable secular catalysts. We continue to invest to enhance our position across our portfolio while preserving profitability and shareholder returns. We are reiterating our 2026 outlook with 2026 revenue growth within our guided range of 10%-12%, Adjusted EBITDA margins between 28%-30%, and EPS growth of 12%-14%. In addition, we remain confident and committed to our long-term operating model. Operator, you can now open the call up for questions.