Amphenolvs.Ciena
APH vs CIEN · 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 3.4× larger than Ciena by market cap; Amphenol trades at the lower P/E (41.6 vs 96.7); year to date, Ciena leads (+89.7% vs +31.2%).
Side by side
| APH | CIEN | |
|---|---|---|
| Market cap | $214B | $63.3B |
| Price | $85.32 | $425.93 |
| Today | −2.5% | −4.6% |
| Return YTD | +31.2% | +89.7% |
| Return 1Y | +43.6% | +189.5% |
| Since June 26, 2026 | +4.2% | −11.2% |
| P/E | 41.6 | 96.7 |
| P/S | 7.4 | 10.5 |
| P/B | 13.8 | 20.7 |
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 →More APH & CIEN comparisons
Other head-to-heads in the Data centers segment.
See where APH and CIEN sit in the full AI & digital infrastructure map: every segment from suppliers to end markets.Open the AI value chain →