Coherent Corp. enters the final day of September with an unusual split: a 3.5% Tuesday bounce that still leaves the stock down 5.9% on the week, while options traders have pushed defensive positioning to its most extreme level of the past year.
The most striking data point this week is in options. The put/call ratio has climbed to 1.43, the highest reading recorded over the past 52 weeks, and more than two standard deviations above its 20-day average of 1.29. That gap reflects a meaningful jump in demand for downside protection, concentrated in the final sessions of the month. The trend has been building steadily: the PCR has risen from around 1.21 in mid-September to its current peak, suggesting this is not a one-day spike but a deliberate repositioning. The next earnings event is pencilled in for November 6, 37 days out, which may be drawing some of that hedging activity forward.
The short-side story, by contrast, has been moving in the opposite direction. Short interest as a percentage of free float eased to 6.4% by September 29, down roughly 4.8% on the week and 10.4% over the past month. That decline takes the position back below levels seen in mid-September, when it briefly ran above 10.9 million shares. The borrow market is consistent with this easing: the cost to borrow has fallen 31.5% over the past week to just 0.37%, and availability is now at 1,440%, meaning there are roughly 14 shares available to lend for every one currently borrowed. The 52-week low availability stood at 680%, so the lending pool has been loose throughout this period. Short sellers are not crowding in, and the infrastructure to squeeze them further barely exists.
The Street sits firmly bullish on Coherent despite the week's pressure. Fourteen analysts carry buy-equivalent ratings with a consensus mean target of $415, against a current price of $292, implying roughly 42% nominal upside. Most recently, Bernstein initiated coverage with an Outperform and a $350 target on September 30, and Rosenblatt reiterated its Buy and held its $500 target on September 24. The bull case centres on Coherent's data-centre and AI communications cycle: revenue of $2.05 billion in the latest quarter, up 34% year-on-year, with data-centre and communications sales rising 41% year-on-year and representing 74% of total revenue. Management has set an addressable market estimate of $60 billion that expands to $90 billion after PhotonLink, with CPO revenue expected from the December 2026 quarter. Bears point to capacity sold out through calendar 2027, qualitative rather than quantified ramp timing on OCS and CPO, continued weakness in the industrial segment (down 3% quarter-on-quarter to $431 million), and macro and tariff risk on an internationally exposed revenue base. EPS momentum over 90 days ranks in the 97th percentile, but the forward earnings yield and EV/EBIT scores rank in the bottom quartile, reflecting the stretched valuation the market is paying for the growth story. The PE multiple on trailing earnings is 22.7x with EV/EBITDA at 15.7x.
Insider activity has leaned consistently toward the sell side over the past 30 days, though the picture is more nuanced than a straight-line signal. The largest open-market sale was Director Enrico Digirolomo's $1.63 million disposal on September 11, not under a 10b5-1 plan, which is more notable than the plan-based sales from the Chief Technology Officer and other directors in late August and early September. The 90-day net across all transaction types is negative 29,636 shares, with net value sold of around $8.5 million. No open-market purchases appear in the record. Separately, BCPE Watson, which holds a Schedule 13D activist position first filed in November 2025, has a most recent amendment dated February 2026 and previously held approximately 5.2% of the class; as of that last disclosure, the stake's current level is unconfirmed, consistent with the standard caveat that 13D/G positions are event-driven around the 5% threshold and holders falling below may not file again.
Coherent's closest peers had a different week. FN gained 5% while GLW closed nearly flat at minus 0.6%, and TTMI fell 3.7%, suggesting the sector did not move in lockstep and Coherent's 5.9% decline was at least partly idiosyncratic. Retail attention has also picked up, with an alt-data Wikipedia-view signal registering a z-score of 2.48 versus the stock's own 90-day history as of September 28, the highest relative attention reading available in the snapshot.
With November 6 earnings approaching, the tension between a structurally bullish analyst community and the most defensive options posture of the past year is the central dynamic to monitor in the weeks ahead.
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