COHR · Coherent
Conviction · Medium · more likely to lead the S&P 500 over the next three months, by a modest margin
Wrong if: a daily close below $170
Note written ·
Price against the kill line
28.3% clear of its kill line on the 13 November 2026 close.
How to read this
The red mark is the price level of the published kill line: a close through it (a weekly close, on a weekly line) would prove the research note wrong on price. The dot is where the stock closed on 13 November 2026; a dot left of the mark has closed through its line.
The scale is stretched near the line, so close calls are easy to see. More than 8% from the line, the stock reads well clear, with a hollow dot to show the figure is off the drawn scale.
The kill line is the research note's own test. The portfolio sells on business facts, not on a price. How the portfolio decides
Three months against the kill line
Daily closes, to . Red: the kill line, a daily close below $170.00, on record since 10 November 2026. The shares are down 37.9% since the close; the S&P 500 is down 2.1% over the same sessions. Figures in the note can cover a different window.
Kill line
A daily close below $170, which would erase the recovery from the 5 November 2026 post-earnings low close of $169.76. Fiscal Q2 2027 revenue under the $2.55 billion guidance floor, or March 2027 quarter PhotonLink revenue under $100 million, would also break the case.
Research onlyNot in the portfolio.
Catalyst
Key figures from the filings · Technology
Quarter to 30 September 2026, filed 4 November 2026; valuation at the 13 November 2026 close
- Revenue, latest quarter ($M)
- 2,370
- Revenue, change on a year (%)
- +49.9
- Gross margin (%)
- 39.1
- Operating margin (%)
- 15.1
- Free cash flow, four quarters ($M)
- −1,834
- Net cash, cash less debt ($M)
- −2,248
- Price to earnings (×)
- 44.6
- Enterprise value to sales (×)
- 5.7
All filed numbers
What Coherent reports to the SEC in its quarterly and annual filings. Each group states its period and filing date once; a figure dated otherwise says so. Built from the filings known on .
| Quarter to | Revenue ($M) | On a year (%) | Gross margin (%) | Operating margin (%) |
|---|---|---|---|---|
| first filed | 2,370 | +49.9 | 39.1 | 15.1 |
| first filed | 2,046 | +33.7 | 38.5 | 13.6 |
| first filed | 1,806 | +20.5 | 37.7 | 10.2 |
| first filed | 1,686 | +17.5 | 36.9 | 10.0 |
| first filed | 1,581 | +17.3 | 36.6 | 13.7 |
| first filed | 1,529 | +16.4 | 35.7 | −4.1 |
| Pre-tax income ($M) | 359 |
| Net income ($M) four quarters: 963 | 385 |
| Diluted shares, change on a year (%) against the quarter to 30 September 2025 | +5.9 |
| Operating cash flow ($M) | −59.1 |
| Capital spending ($M) | 1,775 |
| Free cash flow ($M) | −1,834 |
| Cash and short-term investments ($M) | 1,753 |
| Debt ($M) long-term debt | 4,001 |
| Net cash, cash less debt ($M) | −2,248 |
| Deferred revenue ($M) +420.3% on a year | 333 |
| Backlog, orders not yet delivered ($M) | Not reported |
| Receivables ($M) | 1,604 |
| Inventory ($M) | 3,341 |
| Shareholders' equity ($M) | 11,330 |
| Market value ($M) | 42,967 |
| Enterprise value, market value plus net debt ($M) | 45,214 |
| Enterprise value to sales (×) | 5.7 |
| Enterprise value to operating income (×) | 45.7 |
| Price to earnings (×) | 44.6 |
| Price to book value (×) | 3.8 |
| Free-cash-flow yield (%) | −4.3 |
Short interest (FINRA, settled 15 October 2026, published 26 October 2026): 4.6% of shares outstanding sold short, 1.2 days of average trading to cover, −18.1% since the previous report.
| Window | Bought | Sold |
|---|---|---|
| 90 daysfrom | $1.2M | $8.2M |
| 12 monthsfrom | $1.2M | $20.2M |
The thesis
Coherent is more likely than not to beat the S&P 500 over the next three months. Its fiscal first-quarter 2027 report on 4 November 2026 beat estimates and raised the outlook, it has signed a five-year PhotonLink agreement worth about $20 billion, and its chief executive bought shares on the open market on 9 November 2026. The fiscal second-quarter report, expected in early February 2027, settles it: revenue against the $2.55–2.75 billion guidance, and whether management keeps PhotonLink revenue above $100 million for the March 2027 quarter.
The shares closed at $234.51 on 11 November 2026. That is up from the post-report closing low of $169.76 on 5 November 2026, and still 46.7% below the 52-week intraday high of $440.00 set on 3 June 2026. The rating is Medium. The guidance and the insider buying are real support. Negative operating cash flow and heavy capital spending stop the case from being stronger.
At $234.51, the shares trade below both their 50-day and 200-day moving averages. The price therefore still reflects doubt about cash generation and the timing of PhotonLink revenue more than it reflects the raised guidance.
Bullish and bearish views on Coherent Corp.
The bull case on Coherent Corp. (COHR), in brief: the quarter beat and guidance rose. The bear case: cash flow is negative while spending climbs.
Bull case
- The quarter beat and guidance rose. Benzinga's 4 November 2026 headlines put fiscal Q1 adjusted earnings per share (EPS) at $2.09, against a $1.97 estimate, and revenue at $2.370 billion, against a $2.310 billion estimate. Fiscal Q2 guidance is revenue of $2.55–2.75 billion, against a $2.54 billion estimate.
- Growth is broad and fast. TIKR reported on 7 November 2026 that revenue rose 50% year over year and the Datacenter and Communications segment rose 79% to about $1.95 billion. Futurum Group reports that management guides fiscal 2027 pro forma growth above 60%, with a first $3 billion quarter by fiscal year-end.
- A $20 billion contract anchors PhotonLink. Futurum Group describes a five-year PhotonLink agreement with an undisclosed AI customer, built on a 400-milliwatt laser and starting with co-packaged optics. Management expects PhotonLink revenue above $100 million in the March 2027 quarter and above $250 million a quarter before the end of calendar 2027.
- Insiders bought after the drop. SEC Form 4 filings dated 12 November 2026 show CEO James Anderson buying 5,000 shares at $199.48 on 9 November 2026. Director Enrico Digirolomo bought 1,000 shares at $222.88 on 10 November 2026. Both were open-market purchases.
- Several analysts raised targets after the print. Rothschild & Co Redburn lifted its target to $524.96 from $461.96 on 9 November 2026, per a company news headline. TIKR reported that Citi raised its target to $440 from $420 and Stifel to $450 from $420 on 6 November 2026. J.P. Morgan reiterated a $385 target on 5 November 2026.
Bear case
- Cash flow is negative while spending climbs. TIKR reported fiscal Q1 operating cash use of about $93 million and capital expenditures of nearly $776 million. TIKR also put inventory at $3.3 billion and net debt at $1.56 billion on 6 November 2026.
- Margins are rising slowly. Non-GAAP gross margin was 40.6% in fiscal Q1, up from 38.7% a year earlier, per TIKR on 7 November 2026. Fiscal Q2 guidance is 40–42%. Futurum Group reports that the 45% gross-margin target is set for calendar 2028.
- Much of the big contract's revenue arrives late. Futurum Group reports that revenue from a second anchor customer begins in early calendar 2028. That leaves the March 2027 quarter marker carrying the near-term case.
- A larger rival is forming. Marvell announced an all-stock deal on 2 November 2026 to acquire Lumentum, at an implied enterprise value of $115 billion, with closing expected in the first half of 2028, per TIKR. The combination joins Lumentum's lasers with Marvell's networking chips in direct competition with Coherent.
- Analysts are split on value. TIKR reported that Bank of America cut its target to $240 from $400. Needham lowered its target to $340 and Rosenblatt to $400 on 5 November 2026, per Benzinga.
Price setup
The shares closed at $234.51 on 11 November 2026, per adjusted daily closes. The 50-day moving average is $266.92 and the 200-day moving average is $296.75, both above the price. The three-month change is −28.3%, against a $327.23 close on 13 August 2026.
The report reaction set the recent range. The shares closed at $195.09 on 4 November 2026, fell to $169.76 on 5 November 2026 and recovered to $192.81 on 6 November 2026. They closed at $225.19 on 9 November 2026, $214.66 on 10 November 2026 and $234.51 on 11 November 2026.
The 50-day average is the next level the recovery has to clear. A close back above $266.92 would show the post-report gains holding against the decline from the June high. The 52-week closing low is $135.61, set on 20 November 2025.
Catalysts ahead
- 17 November 2026: Nvidia fiscal Q3 2027 results and conference call. Nvidia is a Coherent customer and shareholder. Its data-center outlook shows whether AI optics demand holds into 2027.
- ~3 February 2027 (est.): Coherent fiscal Q2 2027 report. Tests revenue against the $2.55–2.75 billion guidance, the cash-flow trend and whether the March 2027 quarter PhotonLink marker of more than $100 million still stands.
What would change the view
A daily close below $170, which would erase the recovery from the 5 November 2026 post-earnings low close of $169.76. Fiscal Q2 2027 revenue under the $2.55 billion guidance floor, or March 2027 quarter PhotonLink revenue under $100 million, would also break the case.
The risks this note tracks, each with what would confirm it:
- PhotonLink revenue ramps later or lower than the March 2027 quarter marker. Confirmed by: management guiding March-quarter PhotonLink revenue below $100 million at the fiscal Q2 report.
- Capital spending and inventory keep outrunning cash generation. Confirmed by: a second straight quarter of negative operating cash flow, net debt above $1.56 billion, or new share issuance.
- A combined Marvell–Lumentum takes share in AI datacenter optics. Confirmed by: Coherent's Datacenter and Communications growth slowing below the 79% year-over-year rate reported for fiscal Q1, while Lumentum reports share gains.
- AI infrastructure spending or its financing slows. Confirmed by: nvidia guiding data-center revenue below expectations on 17 November 2026, or large AI cloud customers cutting capital spending plans.
- Gross margin improves more slowly than the guided path. Confirmed by: fiscal Q2 non-GAAP gross margin below the guided 40–42% range.
What it trades with
Coherent trades with AI optics and AI-infrastructure names. On 9 November 2026, the Nasdaq 100 rose 3% as chip stocks rebounded, per a market headline that day, and Coherent closed at $225.19, up from $192.81. On 11 November 2026, CoreWeave's third-quarter results lifted Applied Optoelectronics and other AI stocks, per company news headlines, and Coherent closed at $234.51, up from $214.66.
Nvidia is both a large customer and a shareholder after its $2 billion investment on 2 March 2026. Its 17 November 2026 report therefore bears directly on the group. The pending Marvell–Lumentum deal now links Lumentum's shares to Marvell's, which changes how Coherent's closest optics peer trades.
The evidence, claim by claim (8)
- Fiscal Q1 2027 adjusted EPS was $2.09 against a $1.97 estimate; revenue was $2.370 billion against a $2.310 billion estimate. Benzinga headlines, 4 November 2026 · as of
- Fiscal Q2 2027 guidance is revenue of $2.55–2.75 billion and adjusted EPS of $2.28–2.48, against a $2.54 billion revenue estimate. Benzinga headlines, 4 November 2026 · as of
- Fiscal Q1 revenue rose 50% year over year; Datacenter and Communications revenue rose 79% to about $1.95 billion; operating cash use was about $93 million and capital spending nearly $776 million. TIKR, 7 November 2026 · as of
- Coherent signed a five-year PhotonLink agreement worth about $20 billion with an undisclosed AI customer; management expects PhotonLink revenue above $100 million in the March 2027 quarter. Futurum Group, Coherent Q1 FY2027 note · as of
- CEO James Anderson bought 5,000 shares on the open market at $199.48 on 9 November 2026; director Enrico Digirolomo bought 1,000 shares at $222.88 on 10 November 2026. SEC Form 4 filings dated 12 November 2026 · as of
- Rothschild & Co Redburn raised its target to $524.96 from $461.96; Citi raised its target to $440 from $420; Bank of America cut its target to $240 from $400. Company news headline 9 November 2026; TIKR 6 November 2026 · as of
- Marvell agreed to acquire Lumentum in an all-stock deal at an implied $115 billion enterprise value, with closing expected in the first half of 2028. TIKR, 7 November 2026 · as of
- Net debt was $1.56 billion, inventory was $3.3 billion and fiscal Q1 non-GAAP gross margin was 40.6%. TIKR, 6 November 2026 · as of
Sources
- Coherent Q1 FY 2027: PhotonLink Wins Broaden AI Infrastructure Reach · futurumgroup.com
- Coherent Stock Fell 8% in a Week. J.P. Morgan Sees 100% Upside From Here · tikr.com ·
- Coherent Soars 13% as Citi Lifts Target to $440, Lumentum Up 3% in AI Optics Rebound · tikr.com ·
- Coherent Signed a $20 Billion Deal. The Market Sold It Off 13% Anyway · tikr.com ·
- NVIDIA
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