Quarter ending March came in above the high end of every range we set — revenue $406.8M, up 42.8% year-over-year, 10.2% sequential, I mean operating margin 21% above the high end of our 19.2 to 20.2 band. Network test and monitoring $321.5M, up 54.4%, data center ecosystem and the Spirent lines doing the work, you know? Optical security $85.3M, up 11.4%. Next quarter guided $427-437M, sequential growth again. We're early in the ramp, not at a peak, right? Last but not the least, I don't forecast past the calendar year — call it three quarters visibility, no more.
We set a record of $71 million in high‑end IC mask revenue in Q1, up 19% YoY, then saw it dip to about $57 million in Q2 – down roughly 5% YoY and about 20% sequentially – on delayed design releases. The long‑term drivers remain, alongside temporary headwinds, as demand is inherently variable and our visibility stays limited with a typical backlog of one to three weeks. Because high‑end mask sets carry much higher prices, even a small number of orders can materially move revenue and earnings.
Our IC mask revenue fell about 5% even as leading-edge AI chip demand stayed strong — we follow design releases, not wafer starts. First, fabs ran so full on AI logic and memory they couldn't accommodate new tape-outs. Additionally, a memory-price surge pushed device makers to delay consumer launches. The final factor: geopolitical uncertainty, including the U.S.-Iran conflict, added caution. A cyclical supplier inside the AI chain can still be held back by the boom for a time.