COHR stock: Coherent beat its guidance, then fell 13% the next day

Coherent beat its own guidance on November 4. Fiscal first-quarter revenue came in at $2.37 billion and non-GAAP earnings at $2.09 a share, and the stock rose 5% after hours. The next day it closed at $169.76, down 13%, and 50% under its October 6 high.

The graded accounts we track stayed bullish through the whole slide, with 21 bullish calls to 3 bearish in October. Coherent's capacity update backs their supply argument; on margins, the bears still have a case.

What Coherent reported on November 4

Revenue rose 50% from a year earlier. Datacenter and communications sales grew 79% to $1.95 billion, 82% of the total, while industrial sales fell 15%. Results are from Coherent's November 4 earnings release; the earnings estimate is FactSet's, via CNBC, and the revenue estimate is Investing.com's.

For the December quarter, Coherent guided revenue of $2.55 billion to $2.75 billion, gross margin of 40% to 42%, and earnings of $2.28 to $2.48 a share (non-GAAP). It targets its first $3 billion quarter by the end of fiscal 2027, a $4 billion quarter in fiscal 2028, and gross margin above 45% before the end of 2028.

Indium phosphide (InP) laser capacity doubled from a year earlier, a quarter ahead of plan, and should more than double again by the end of 2027. Coherent also signed a five-year PhotonLink optics deal worth about $20 billion with an AI data center customer, with revenue from early 2028.

The stock fell 6% during the regular session on November 4, before the release. CNBC reported shares up 7% at about 5 p.m. ET, and the last after-hours trade was $204.79, up 5%. On November 5 the gain reversed: COHR closed at $169.76, down 13%. Lumentum and Applied Optoelectronics fell as much, in an AI optical selloff that 24/7 Wall St. tied to worries about tighter data center rules after Democrats won Congress. It also pointed to Coherent's spending: $776 million of capital expenditure in the quarter and negative free cash flow of $868 million.

How it lands against the cases below:

• Supply (bull): holds up. Capacity doubled a quarter early, and Coherent says customer orders now reach into 2028.
• Margins (bear): half right. Gross margin rose about 2 points from a year earlier, but it landed mid-guide, and the December guide adds less than half a point at the midpoint.
• Valuation (bear): still open. The answer depends on Coherent hitting its $3 billion and $4 billion quarter targets on time.

What happened to COHR stock

Price

$169.76-54% over the window+0% off the low

Jul 1Nov 5

No company event explains the drop. The big down days lined up with selling across AI hardware and optics:

• October 14: COHR fell 9.2% after September core inflation came in above forecasts and traders priced in the risk of a Fed hike, per TIKR.
• October 22: COHR fell another 12.5%. We found no company news that day.
• October 30: COHR fell 11.3% to $210.32 after Intel and Amazon results hit AI hardware stocks, per TIKR. Intel fell more than 25% that day, Reuters reported.

Wall Street stayed positive: Rosenblatt's $500 target was the Street high in mid-October, per 24/7 Wall St, and StoneX started at Buy with a $425 target on October 26.

COHR made a similar drop in the summer, falling 48% in June and July while our score stayed in the 80s and low 90s, before the price came back 46%.

The bull case

The bullish accounts see a supply squeeze in the lasers AI data centers need.

• Laser supply is tight. @carrioresearch argues indium phosphide (InP) laser supply stays tight into 2027 and 2028, and that Coherent plans to double its 6-inch InP output and double it again by the end of 2027. It also expects US-content rules to favor US-made lasers.
• Pluggables last longer. @TheValueist expects pluggable transceivers to stay dominant through 1.6T speeds, which extends Coherent's main product cycle, with co-packaged optics adding content later. @TheValueist also points to Coherent's nonexclusive optical agreement with NVIDIA, which invested $2 billion in Coherent in March to fund the InP fab in Sherman, Texas.
• Pricing power. @aleabitoreddit and @ParadisLabs argue that tighter laser allocation supports laser prices, and that hyperscalers want Coherent as a second laser source.
• Peers are reporting well. On November 2, @Gaetano2026 read Lumentum's strong quarter as a bullish sign for Coherent.

These are their views. For more on two of these accounts, see TheValueist's profile and aleabitoreddit's profile.

The bear case

The bearish calls focus on margins and timing.

• Margins may lag. On October 12, @Gaetano2026 argued that scarce 6-inch substrates and unclear yields would keep margins from expanding for several quarters.
• Photonics names failed to bounce. The same day, @CKCapitalxx turned bearish on the near term.
• One account sold out. On October 13, @DeepValueBagger sold the whole position and said it was walking away while others stayed bullish. COHR closed at $289.98 that day and $195.09 on November 4.
• Valuation. StoneX's $425 target works out to about 45 times fiscal 2027 earnings estimates, TIKR noted, against a five-year average multiple near 24.

The graded accounts we track were 21 bullish to 3 bearish in October, and COHR fell 42% from its October high to the November 4 close. On that stretch, the price went against them.

Where sentiment stands now

Quantral's 7-day score for COHR was 79 on the morning of November 3, a bullish read. The score gives more weight to authors with a proven track record. In the last 30 days the accounts we track mentioned Coherent 109 times: 92 on X from 18 accounts and 12 on Reddit, plus a Congress filing, a Substack post and a YouTube video.

What to watch

1. Gross margin against the 40% to 42% guide for the December quarter. A print near the top would weaken @Gaetano2026's bear case.
2. The InP ramp and PhotonLink. Capacity should more than double again by the end of 2027, and PhotonLink revenue starts in early 2028.
3. The rest of AI hardware. October's worst days followed rates and other companies' earnings.
4. The next report, for the December quarter. No date yet; last year's came February 4.

For how Coherent sits next to the other GPU, networking and power names, start with our AI infrastructure stocks list, which also covers PENG.

Common questions

What is the COHR stock price?

COHR closed at $169.76 on November 5, 2026, down 13% the day after Coherent's earnings release, despite a 5% gain after hours on November 4. Its 52-week closing range runs from $135.61 (November 20, 2025) to $426.89 (June 2, 2026).

What does Coherent do?

Coherent makes lasers, optical transceivers, and the materials behind them, including indium phosphide wafers. AI data centers and communications networks buy most of its output, and it also sells into industrial markets.

When is the next Coherent earnings date?

Coherent reported fiscal Q1 2027 results, for the quarter ended September 30, on November 4, 2026, after the close: revenue of $2.37 billion and non-GAAP earnings of $2.09 a share, both above its guidance. The next report covers the quarter ending December 31 and has no date yet. Last year's December-quarter report came on February 4.

Why did COHR stock fall in October?

No company news explains it. The biggest drops came when inflation data, rising yields, or Intel's and Amazon's results hit AI hardware stocks as a group. We don't give buy or sell advice.

Try it

See how Coherent's score moves after the report in Quantral, with every call behind it and the record of the account that made it. Quantral is an investment ideas app built on alternative data, on the web at app.quantral.com, on iOS and on Android, with a 7-day free trial on the yearly plan. The Coherent stock page has the mention history.

Mention counts cover the accounts Quantral tracks; graded accounts are accounts with a graded track record. Positions attributed to accounts are their views, not Quantral's.

---

Quantral surfaces signals and context from public sources to support your own research. Nothing here is financial advice or a recommendation to buy or sell. Past signals are not indicative of future results.