Onto Innovation (ONTO) is trading higher as investors react to recent analyst upgrades and price-target increases that point to improving fundamentals in advanced packaging inspection and metrology—areas closely linked to AI compute buildouts. The trade is also supported by Onto’s April guidance update, which raised first-quarter revenue expectations to about $292 million and provided second-quarter revenue guidance of about $325 million at the midpoint, reinforcing a stronger near-term demand picture.

Analyst commentary over the past two weeks has emphasized momentum tied to 2.5D/advanced packaging workflows, where process-control intensity is rising as chipmakers push higher bandwidth and tighter yields. Recent notes specifically called out progress in advanced packaging and a more constructive setup for 2026 growth, helping lift sentiment even as the stock has already run significantly.

Separately, Onto disclosed an agreement to acquire a 27% stake in Rigaku Holdings for approximately $710 million, a sizable transaction that adds a strategic angle to the story and can influence near-term positioning and volatility. While not necessarily the day’s sole driver, the filing remains part of the current news backdrop investors are weighing alongside the packaging-driven upside case.

Traders will be looking for any additional company commentary that confirms the cadence implied by the raised Q1 expectation and Q2 outlook, plus continued evidence that advanced packaging demand is translating into sustained orders and margin resilience. Any incremental updates on the Rigaku investment timeline and financing approach could also impact the stock’s near-term path.