This Tech Stock Has Printed Money for Patient Investors for 5 Years, and It's Still Cheap

Onto Innovation reported record FY2025 revenue of about $1.005 billion and gave Q1 2026 revenue of $292 million, above guidance of $275 million-$285 million, while guiding Q2 revenue to $320 million-$330 million and full-year 2026 growth above 30%. The Dragonfly G5 advanced packaging tool has completed qualification and is set to ship first units in June 2026, with Dragonfly platform demand expected to grow more than 50% in 2026 and a $240 million HBM contract already in place through 2027. The setup is constructive for AI packaging growth, though customer concentration and competition from Applied Materials and KLA remain key risks.

Analysis

The more important read-through is not just that ONTO is winning share, but that AI capex is becoming more specialized and less fungible. As packaging complexity rises, the spend migrates from broad wafer-fab capacity into inspection/metrology bottlenecks, which typically carry better pricing power and stickier qualification cycles than generic tools. That creates a second-order winner profile: ONTO benefits from every incremental chiplet/HBM layer added, while downstream assemblers and OSATs are forced to keep upgrading test/inspection throughput just to preserve yield.

The competitive signal is mixed for incumbents. AMAT and KLAC can pressure the category, but the bigger implication is that their larger platforms may be forced to defend share by bundling or pricing more aggressively in adjacent advanced packaging workflows. That can compress margins in the broader process-control stack even if ONTO itself keeps growing, because customers will use ONTO’s ramp as evidence that specialized point solutions are now the standard rather than optional add-ons.

The key risk is timing mismatch: the equity is now trading on a multi-quarter growth narrative while the underlying revenue is still exposed to a narrow set of HBM and packaging customers. If AI training spend pauses for even one budgeting cycle, order deferrals could show up quickly because equipment demand is lumpy and qualification-driven, not consumable-like. The market likely underestimates how sensitive this is to a single major HBM customer’s capex cadence over the next 2-3 quarters.

Contrarian take: the move may be directionally right but tactically stretched. The stock is already pricing in a clean Dragonfly G5 ramp, so upside from here likely requires either faster-than-guidance packaging adoption or an upward revision to operating margin, not just meeting current targets. That makes pullbacks into post-earnings volatility a better entry than chasing strength, especially if management commentary hints at qualification slippage or backlog conversion timing.

Key Decisions for Investors

• Long ONTO on a pullback into the next 2-6 weeks; best risk/reward is entry after any post-guidance consolidation rather than at highs, with a 3-6 month target tied to Dragonfly G5 shipments and margin expansion
• Pair trade: long ONTO / short AMAT or KLAC over the next 1-2 quarters to express the view that specialized advanced-packaging inspection is taking incremental wallet share from broader tool vendors
• For event-driven exposure, buy ONTO call spreads 1-2 quarters out to capture the next re-rating if G5 ramps cleanly; cap downside versus outright shares given the stock’s already-extended move
• If HBM spending data weakens or a major memory customer signals capex moderation, reduce ONTO quickly; the setup is high-conviction but low-forgiveness because revenue concentration can unwind faster than backlog suggests
• Use AMAT/KLAC weakness as a hedge against ONTO long exposure rather than a standalone short; the bear case is mostly relative-share loss, not a broad collapse in process-control demand