Amphenolvs.Coherent
APH vs COHR · both in Data centers, part of the AI & digital infrastructure value chain: Servers, networking, optics and data center capacity that tie AI infrastructure together.
Amphenol is about 3.2× larger than Coherent by market cap; Amphenol trades at the lower P/E (40.4 vs 79.5); year to date, Coherent leads (+49.3% vs +15.1%).
Side by side
| APH | COHR | |
|---|---|---|
| Market cap | $208B | $64B |
| Price | $158.78 | $288.14 |
| Today | +2.1% | +4.6% |
| Return YTD | +15.1% | +49.3% |
| Return 1Y | +42.2% | +206.4% |
| P/E | 40.4 | 79.5 |
| P/S | 7.2 | 9.0 |
| P/B | 13.4 | 5.9 |
Data as of 2026-08-26 · updates daily after U.S. close
The two companies
AmphenolAPH
Interconnect hardware: connectors and cable, plus a sensor business. The high-speed parts end up in AI servers and data center gear.
Full APH profile →CoherentCOHR
Makes the transceivers and lasers that turn data into light for the hop between AI servers.
Full COHR profile →More APH & COHR comparisons
Other head-to-heads in the Data centers segment.
See where APH and COHR sit in the full AI & digital infrastructure map: every segment from suppliers to end markets.Open the AI value chain →