Key Highlights

  • COHR shares fell roughly 11.57% today to $310.58, reversing a large chunk of a rally that had carried the stock to about $351.19 by the Aug. 17 close, when semiconductor and AI-optics names surged broadly.
  • The pullback follows Coherent's Aug. 12, 2026 fiscal Q4 report, which beat on Revenue ($2.05 billion, +33.8% YoY) and non-GAAP EPS ($1.74, beating a $1.62 estimate), but showed capital expenditures surging 150% to $1.10 billion and Operating Cash Flow collapsing 87.5%, producing preliminary negative free cash flow of about $1.02 billion.
  • Wall Street reaction has been split: Rosenblatt reiterated a Buy rating with a $500 price target while B. Riley kept a Neutral rating with a $345 target, reflecting disagreement over whether the AI-optics capacity buildout will convert into sustainable cash generation.
  • The drop also lines up with a broader Reversal across AI-datacenter optical suppliers after peer Fabrinet's Aug. 17 after-hours Earnings showed Margin compression and negative free cash flow despite beating estimates, a read-through that hit Coherent given its status as a major photonics and laser components supplier to the same AI-infrastructure customers.

Stock Gives Back Gains After Post-Earnings Cash Flow Concerns

Coherent Corp shares fell about 11.57% on Aug. 18, 2026, to roughly $310.58, extending a decline that began after the company's fiscal Q4 2026 earnings release on Aug. 12. Revenue hit a record $2.05 billion (up 33.8% year-over-year) with non-GAAP EPS of $1.74, both ahead of consensus, and full-year revenue reached $7.12 billion (up 22.5%). But capital expenditures jumped 150% year-over-year to $1.10 billion while operating cash flow fell 87.5% to $79.5 million, leaving preliminary free cash flow at roughly negative $1.02 billion, versus positive $192.8 million a year earlier, as inventory ballooned nearly 80% to $2.58 billion to support AI-optics capacity expansion.

Fabrinet Read-Through Compounds Sector-Wide Selling

The decline also tracks a broader reversal across AI-datacenter optical and photonics suppliers after Fabrinet, a major contract manufacturer in the same optical-components Supply chain, reported fiscal Q4 results after the close on Aug. 17 that beat headline estimates but showed roughly 30 basis points of gross-margin compression and negative free cash flow of about $37 million. That "beat-and-retreat" reaction spread to Coherent and other optics-linked names on Aug. 18, layered on top of a weak macro backdrop of Brent Crude above $88 a barrel, a 30-year Treasury Yield above 5.3%, and soft July retail sales data pressuring high-multiple Growth Stocks broadly.

Mixed Analyst Views After a Historic Run-Up

Coherent shares had rallied roughly 71% over seven consecutive sessions into early August and gained a further 7.8% on Aug. 17 as semiconductor stocks broadly entered bull-market territory, leaving the stock richly valued heading into today's reversal. Sell-Side reaction to the Q4 report has been mixed: Rosenblatt maintained a Buy rating with a $500 price target, while B. Riley assigned a Neutral rating with a $345 target, underscoring diverging views on whether aggressive AI-optics capacity Investment will translate into durable cash generation. The stock still carries a consensus Buy rating from 22 analysts with an average price target near $411.

Where Things Stand

Coherent's roughly 11.57% slide on Aug. 18 reflects a combination of profit-taking after an extraordinary multi-week rally, lingering investor concern over the negative free cash flow and surging capex disclosed in its Aug. 12 earnings report, and a sector-wide reversal in AI-optical names following Fabrinet's mixed results a day earlier. Fundamentally, Coherent's underlying revenue and margin trends remain strong, with record quarterly revenue and expanding operating margin. These are the verified facts as reported. Whether the pullback extends may depend on whether Coherent's heavy AI-optics capital spending begins converting into positive free cash flow in coming quarters.