ChatGPT told same

My answer: COHR is “reasonable” around $240–$280, with $250–$260 as the cleaner fundamental entry zone. At the current price of about $319, it is already priced for an optimistic AI/CPO ramp rather than for a normal margin of safety. COHR’s current price was about $319.19, with a market cap around $62.4B, in the finance feed I checked.

Valuation anchor

Coherent’s latest reported numbers are strong: Q3 FY2026 revenue was $1.806B, up 20.5% year over year, and Q3 non-GAAP EPS was $1.41. For the first nine months of FY2026, revenue was $5.073B and non-GAAP EPS was $3.86. Management guided Q4 FY2026 revenue to $1.91B–$2.05B and non-GAAP EPS to $1.52–$1.72. (Coherent Inc)

Using the midpoint of Q4 guidance, I get:

Item	Estimate
FY2026 revenue	~$7.05B
FY2026 non-GAAP EPS	~$5.48
Current price / FY2026 non-GAAP EPS	~58x
Current EV / FY2026 revenue	~9.0x

That is a high multiple for an optical/manufacturing-heavy company, even one with strong AI demand. It is not absurd if CPO demand compounds hard into 2027–2028, but it leaves little room for execution error.

My price ranges

COHR price	My interpretation
Below $220	Attractive, assuming the AI optics thesis remains intact
$220–$250	Reasonable buy zone
$250–$280	Fair value / acceptable if you have conviction
$280–$320	Bull-case pricing; hold rather than chase
Above $320	Requires very strong FY2027–FY2028 execution

So, if by “reasonable” you mean reasonable for a new position, I would say around $250, plus or minus $20. If you mean fair value under an optimistic CPO scenario, then $280–$320 can be defended, but it is no longer cheap.

Why $250–$280 makes sense

Using FY2026 revenue of about $7.05B and net debt of roughly $0.78B, the implied share prices at different EV/sales multiples look like this:

EV / FY2026 sales multiple	Implied COHR price
6x	~$212
7x	~$248
8x	~$284
9x	~$320

A 7x–8x revenue multiple is already generous for a photonics/components company, but arguably justified by the NVIDIA relationship, CPO exposure, and AI datacenter optics demand. A 9x multiple, which is roughly where the current price sits, assumes the market will keep treating COHR more like a scarce AI infrastructure asset than a cyclical optical-component supplier.

NVIDIA’s $256.80 price is an important clue

NVIDIA bought 7,788,161 COHR shares at $256.80 per share, for a total of $2B, according to Coherent’s SEC filing. That price is not a perfect “fair value” signal because NVIDIA also received strategic benefits: supply access, capacity rights, and a deeper partnership. But it is still a useful anchor. It puts a sophisticated strategic buyer’s entry point almost exactly in the $250–$260 range. (SEC)

NVIDIA and Coherent also described the agreement as nonexclusive and tied to advanced optics technology, manufacturing capacity, R&D, and future access/capacity rights for laser and optical networking products. That supports the bull thesis, but it also means the stock should not be valued as if NVIDIA has permanently locked in all future COHR growth. (NVIDIA)

What would justify today’s ~$319 price?

At $319, COHR needs something like this to be fundamentally reasonable:

1. FY2027 non-GAAP EPS reaches roughly $8–$9+.

2. The market continues paying 35x–40x forward EPS.

3. AI optics demand remains supply-constrained.

4. CPO and related advanced optics revenue ramp without major yield, capacity, or pricing problems.

5. Free cash flow improves after the current capacity build.

The cash-flow point matters. Coherent reported only $10.1M of operating cash flow for the first nine months of FY2026 while spending $547.2M on capex, reflecting heavy inventory and capacity investment. That may be rational given demand visibility, but it makes the current valuation more dependent on future conversion to cash. (Coherent Inc)

Practical conclusion

For a disciplined fundamental entry, I would use:

Reasonable price: $240–$280
Preferred entry: $250 or lower
Too rich for new money: above ~$300 unless you have high conviction in a multi-year CPO shortage cycle

At $319, COHR is not obviously overvalued if the AI optics boom keeps accelerating, but it is no longer in the “reasonable with margin of safety” zone.