ON Semiconductor Corp.: AI DC Acceleration and Fab-Right Leverage Offset Near-Term High Bar

Core Conclusion

ON reported a slight beat, but the post-print reaction was muted—the stock had rallied ~60% in the past month, setting a high bar. The underlying setup, however, remains intact. AI DC revenue accelerated to >30% q/q in MarQ, nearly double the mid-teens expectation entering the quarter. Management guided 2026 AI DC revenue to double y/y to >$500mn, with traction broadening across CPU vendors, hyperscalers, and power supply vendors. Utilization improved from ~68% to 77% despite a seasonally muted guide, enabling a third consecutive GM% expansion to 38.5%. The market is overweight on near-term auto weakness and the elevated stock price, underappreciating the durability of AI DC growth in higher-voltage architectures and the structural GM improvement from fab-right execution. Utilization leverage has substantial runway: each 1pt of utilization adds ~25-30bps to GM, and current 77% loadings remain well below prior peaks.

Evidence Chain

AI DC Growth Is Accelerating and Broadening. MarQ AI DC revenue grew >30% q/q, nearly double the high-teens expectation. Management provided its first annual AI DC guide: 2026 revenue to double y/y to >$500mn (from >$250mn in 2025). Momentum is visible across CPU vendors, hyperscalers, and power supply vendors. The longer-term opportunity extends beyond current 4-walls to higher-voltage architectures, power density, and efficiency gains. Industrial adjacencies (ESS, microgrids, string inverters) also show momentum, adding optionality not priced in.

Utilization Improvement Drives Sequential GM Expansion. Utilization increased to 77% in MarQ vs. prior expectations for low-70s, as ON ramped loadings intra-quarter to meet stronger demand. This supports management’s view for sequential GM improvement through 2026. Each 1pt of utilization contributes ~25-30bps of GM improvement. Pricing actions are expected to offset higher input costs in 2H26. GM% reached 38.5% in MarQ and is forecast to reach 44% by 2027 (MS estimate), driven by scale and fab-right execution.

Auto Recovery Remains Muted but Content Story Intact. Auto revenue was flat q/q in MarQ (in-line) and expected flat again in JunQ. Management is shipping to natural demand; no replenishment yet. However, select technologies (China EV, SiC, IGBT, zonal/10BASE-T1) are already on allocation, and lead times have extended modestly, partly due to AI DC strength. If auto replenishment returns, supply could tighten further.

Estimate Revisions Modest; 2027 Opportunity Larger. MS 2026 EPS raised from $2.96 to $3.12; 2027 EPS largely unchanged at $4.36. MS models 2027 revenue of $7.2bn (+11% y/y), driven by Industrial and DC, with GM reaching 44%. The larger opportunity lies in 2027, where MS is already above consensus, primarily on Industrial and DC upside.

Key Risks

• Auto recovery slower than expected: No channel replenishment and continued pricing pressure in power discretes could delay inflection.
• Stock price exceeds target: At $102, the stock trades above the $87 price target (20x FY27 EPS of $4.36), limiting near-term upside and reflecting elevated expectations.
• AI DC still small portion of revenue: Scaling could face competition or technology shifts; execution risk remains.

Valuation or Trade Implication

At $102, ON trades at 23x 2027 EPS of $4.36 (MS estimate), above its historical average and the 20x target multiple. The Equal-weight rating reflects limited upside from current levels. The setup remains intact for 2H26/2027, as AI DC and Industrial growth materialize. A pullback toward $87 would offer a more compelling entry, aligning with the 20x FY27 valuation. Investors should wait for a better risk/reward entry rather than chase the post-rally price.

Appendix: Revenue by End Market (MarQ)