Coherent (COHR)
The desk's stance
On our research list, not on the slate.
What the company does
Makes the lasers, indium-phosphide chips, and optical transceivers that carry data between GPUs — the picks-and-shovels of AI networking, from the laser diode up to the 800G/1.6T module.
Why it matters: Every AI cluster is bottlenecked by how fast light moves data between chips — Coherent supplies the lasers that make it possible, one layer below Broadcom and Marvell.
Outlook: Fiscal Q4 (reported Aug 14, 2026) revenue hit $2.05B, up 34%, with Datacenter & Communications at $1.62B, up 59% and now 79% of sales. The 1.6T transceiver ramp pulled in, first co-packaged-optics revenue is due in the December quarter, and indium-phosphide laser output is set to more than double again by end of 2027; the September-quarter guide is $2.2–2.4B. A Sept 17 launch extended its pluggable line systems to full C-band amplifiers for 800G ZR/ZR+ datacenter interconnect. The debate is whether transceiver price competition caps gross margin near the 42% target.
In short: Optical transceivers and lasers. Category: AI Optical Networking Hardware. Sector: Technology, Scientific & Technical Instruments.
G-Street Value and Score
G-Street Value: $369.55, computed Oct 18, 2026 (confidence: medium).
How we got there: 70% analyst leg $369.55 (5 analyst targets, credibility- and freshness-weighted, after 8% optimism discount) + 30% GainStreet factor value $415.35 (29.55× fwd EPS anchored to technology multiples) — capped at the analyst leg; factors never out-bull the street.
G-Street Score: 63 out of 100 (Medium).
- Top-line growth & guidance: 32 of 32
- Margin power: 7 of 15
- Revenue visibility & quality: 5 of 11
- Profitability & balance sheet: 11 of 24
- Capital allocation & governance: 0 of 6
- Valuation, sentiment & momentum: 8 of 12
Our current thesis
Updated Oct 15, 2026
The thesis
- Accelerating 800G and 1.6T transceiver demand drives consecutive quarters of beat-and-raise performance.
- Proprietary 6-inch indium phosphide fabrication provides significant cost and manufacturing scale advantages.
- Robust hyperscaler purchase orders extend multi-year backlog visibility into calendar 2028.
Risks
- Aggressive fab capex pushed trailing free cash flow to negative $1.03 billion.
- Total debt of $3.55 billion increases balance sheet vulnerability during optical networking digestion cycles.
- Customer concentration among hyperscaler AI buyers poses downside risk if cluster builds pause.
What we're watching
- Q1 FY27 earnings release on November 4, 2026, targeting $2.30B consensus revenue.
- Free cash flow inflection point as 6-inch InP fab capex crests.
- Key technical support testing around the $250 level following the pullback from $440.
Latest
Coherent shares dropped 9.2% to $263.32, pulling back 40% from 52-week highs despite accelerating sequential revenue growth to $2.05B (+33.7% YoY) and four consecutive quarters of EPS beats. Surging capital expenditures for 6-inch indium phosphide fab expansion pushed trailing-twelve-month free cash flow to negative $1.03B, creating near-term balance sheet drag. The pullback has compressed forward P/E to 18.7x ahead of Q1 FY27 earnings, where Street consensus models $2.30B in revenue.
Key numbers
As of Oct 16, 2026: market cap $45.9B · revenue growth +33.7% year over year · gross margin 37.5% · net margin 11.3% · forward P/E 16.6 · next earnings Nov 4, 2026.
Analyst price targets
Published analyst targets we could trace to a named source.
- Rosenblatt Securities, Buy: $500 target (October 2026). Source: tradingview.com
- Bernstein, Outperform: $350 target (September 2026). Source: benzinga.com
- Deutsche Bank, Buy: $400 target (September 2026). Source: benzinga.com
- Morgan Stanley, Equal-Weight: $375 target (August 2026). Source: benzinga.com
- Needham, Buy: $420 target (August 2026). Source: investing.com
Decision history
- Sep 23, 2026 — Sold at $300.60: +1.6% since entry (Cut). Exit to reduce AI-infrastructure concentration, preferring NVDA, AVGO and TSM in the remaining book. The optical ramp is credible, but fiscal-2026 operating cash flow less property, plant and equipment spending was about negative $1.02B. Cash conversion and forecast dependence weaken the relative case; this is a portfolio choice, not a claim that the optical thesis has failed.
- Sep 17, 2026 — Moved to Buy Zone at $295.98. Joins in AMD’s slot at $296, 33% under our $395 value at 21x forward. Coherent is the optics inside the AI rack — 1.6T transceivers ramping now, co-packaged optics next — with datacenter revenue up 59% last quarter to $1.6B on 34% total growth. It sits well off its summer high on transceiver price-competition fear; that is a margin question, not a demand one. Buy-zone from $296.
On the Gainz Lab maps
Who it does business with
- Coherent supplies Microsoft — Optical transceivers (about $2.0B a year). Coherent’s 800G/1.6T optical modules wire together the GPU clusters inside Azure’s AI datacenters.
- Coherent partners with Broadcom — Optics for Ethernet. Broadcom’s Ethernet switch silicon needs the optical modules Coherent and its peers build around it.
- Lumentum competes with Coherent — Datacenter optics. Lumentum and Coherent fight for the same hyperscaler transceiver and laser design wins.
In the Daily Brief
Named in 3 editions on 3 days.
- Oct 2, 2026: Ten-year yields finally took a breather from 2002 levels, and AI optics sprinted right through the opening
- Oct 1, 2026: Yields crossed 5.3% and dragged sentiment into fear, but the AI optical buildout doesn't care about borrowing costs
- Aug 10, 2026: Oil surged on Hormuz jitters, and our portfolio's tech darlings are feeling the weight of profit-taking