Coherent Drops 20% in a Week as Analysts Slash Targets

Coherent Corp. makes lasers, optical transceivers, and compound semiconductor components that sit at the heart of AI data centre networking. Its shares closed at $231.80 on Tuesday, down 20% for the week and 27% over the past month, a sharper fall than any of its closest peers.

The decline has company. Fabrinet fell 17% over the same five sessions, and TTM Technologies dropped 18%. Corning and Keysight each lost between 10% and 11%. The peer group is clearly under pressure, but Coherent's drop is the steepest of the cohort by a meaningful margin, suggesting something beyond sector rotation is at work.

The most immediate explanation is the analyst tape. Three firms cut their price targets in the past week, and the moves were large. TD Cowen trimmed its target from $395 to $275, maintaining a Buy but acknowledging the stock's changed trajectory. Susquehanna came through this morning, cutting from $425 to $350 while holding a Positive rating. B. Riley moved to $297 from $345 earlier in the week. All three kept their ratings intact, which tells a specific story: the Street has not lost conviction on the business case, but it has rapidly repriced where the shares belong. The consensus mean target now stands at $395, roughly 70% above the current price, a gap that reflects how fast the stock has moved rather than fresh bullishness from analysts.

The underlying debate is well-defined. Bulls point to Coherent's vertically integrated model, spanning lasers, photodiodes, isolators, and full optical engines, as giving it more revenue per link than component-only rivals. Management reported fiscal fourth-quarter revenue of $2.05bn with EPS of $1.74, and has plans to double InP laser capacity in calendar 2026 and again in 2027, with long-term agreements already in place and customer buying running above contractual minimums. Bears counter that InP supply constraints, tariff exposure, and competition from VCSELs for single-rack applications could limit how much of the AI-driven 800G and 1.6T upgrade cycle Coherent actually captures. The factor profile adds texture: EPS momentum ranks solidly in the 67th and 74th percentiles over 30 and 90 days respectively, but the forward earnings growth score sits at just the 12th percentile, and the EV/EBIT rank is in the 18th, suggesting the market is paying a premium that earnings acceleration has not yet validated.

Short positioning is building steadily, though not at alarm levels. Short interest has climbed to 7.1% of the free float, up about 5% over the past month and 2.6% over the past week. The borrow market offers no squeeze signal to counterbalance that trend: availability is extremely loose at roughly 1,875%, meaning shares to borrow are plentiful relative to existing short interest. Cost to borrow remains negligible at 0.41%. None of that points to a technical overhang from short covering. Options positioning is more pointed. The put/call ratio closed at 1.62, close to its 52-week high of 1.72 hit on Monday, and nearly 1.8 standard deviations above its 20-day average of 1.43. Demand for downside protection has risen sharply this week alongside the price decline.

One item from the ownership register worth noting: BCPE Watson, filing on a Schedule 13D, holds an activist position in Coherent. The most recent amendment was filed in February, with a prior disclosed stake of 5.2%. As with all 13D/G disclosures, the position is as-last-reported around the 5% threshold, and a holder can fall below 5% without a further filing. Wikipedia attention for the stock ranked 2.5 standard deviations above its own 90-day average as of late September, a retail attention reading rather than a revenue signal, but consistent with the degree of public interest a 20% weekly move tends to generate.

The next earnings report is scheduled for 4 November. The last print, in August, produced a 7% one-day gain that subsequently reversed into an 11% five-day loss, a pattern that suggests the stock has tended to give back post-earnings moves quickly. With targets freshly cut across the Street and options traders carrying elevated put exposure into the release, the November print will be scrutinised less for whether Coherent is growing and more for whether its InP capacity expansion is on track and what management says about demand visibility beyond the existing long-term agreements.