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 3.3× larger than Coherent by market cap; Amphenol trades at the lower P/E (41.6 vs 81.4); year to date, Coherent leads (+83.3% vs +31.2%).
Side by side
| APH | COHR | |
|---|---|---|
| Market cap | $214B | $65.5B |
| Price | $85.32 | $302.35 |
| Today | −2.5% | −9.6% |
| Return YTD | +31.2% | +83.3% |
| Return 1Y | +43.6% | +194.8% |
| Since June 26, 2026 | +4.2% | −20.6% |
| P/E | 41.6 | 81.4 |
| P/S | 7.4 | 9.2 |
| P/B | 13.8 | 6.0 |
Data as of 2026-10-08 · updates daily after U.S. close
Since June 26, 2026: the change in the closing price, from the daily closes Sectivia records itself since that date.
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.