ON Semi Shorts Build as Analysts Trim Targets

ON Semiconductor has dropped 5.6% over the past month to $71.67, diverging sharply from its closest semiconductor peers. NXPI rose 10.5% last week alone, TXN added 5.7%, and MCHP gained 4.4% over the same period. ON moved the other way, down 0.8% on the week against a peer median of roughly +2.5%, a gap that stands out even in a sector prone to rotation.

Short interest has been building steadily through that underperformance. At 7.8% of free float, it has grown roughly 6% over the past month and nearly 2.8% in the past week alone, reaching 31.2 million shares. The lending market remains loose: availability is running at 1,841% of existing short interest, meaning there is far more stock available to borrow than is currently borrowed, and cost to borrow is just 0.49%. That borrowing cost has nearly doubled over the past week from very low levels, but at under half a percent it imposes no meaningful friction. Shorts are adding, and entry is still cheap. Options positioning does not add pressure from the other side: the put/call ratio of 0.39 is barely above its 20-day average and sits near its 52-week low, suggesting options traders are not piling into downside protection alongside the shorts.

The analyst debate heading into the print centres on how much margin credit ON deserves for a story that is still largely in progress. Multiple firms trimmed targets in October, with B. Riley cutting from $127 to $105 and Susquehanna from $150 to $120, both while maintaining positive ratings. TD Cowen, already sceptical, reduced its Hold target from $95 to $75, roughly where the stock now trades. The consensus mean sits at $101.63, a 42% premium to the current price, which reflects the bull case: that higher silicon-carbide and AI data-centre content per vehicle and per rack can carry gross margins from 40% today toward a 53% target by 2030, with AI data-centre revenue potentially rising from above $500 million in 2026 to more than $2.5 billion by 2030. Bears counter that this is a thesis about future manufacturing efficiencies and product mix shifts that the company has not yet demonstrated at scale, and that 25%-plus China exposure amplifies both cyclical and geopolitical risk if EV adoption or ADAS spending slows. The pending Synaptics acquisition adds another variable: accretive on paper but still unresolved on integration and regulatory timing.

Historical reactions lean negative. The September print brought a one-day drop of 6.7%, and the August result fell 1% on the day before giving up another 1.2% over the following week. Two consecutive negative first-day reactions have done little to stabilise positioning. FMR LLC disclosed trimming its stake to 8.2% from 15% across its last filing, a significant reduction from one of ON's larger holders. BlackRock added modestly to its 10.5% position, and Columbia Management nearly quadrupled its holding to 1.4% in the September quarter, but those additions have so far not been enough to absorb the supply.

The print will test whether ON's margin trajectory is accelerating fast enough to justify holding the stock through a period of rising short interest, peer outperformance, and target-price compression from analysts who remain constructive in rating but increasingly impatient on timing.