Arm Holdingsvs.Western Digital
ARM vs WDC · both in Chips & accelerators, part of the AI & digital infrastructure value chain: Designs and builds the processors, accelerators and memory that train and run AI.
Arm Holdings is about 2.1× larger than Western Digital by market cap; Western Digital trades at the lower P/E (14.6 vs 281.6); year to date, Arm Holdings leads (+169.3% vs +128.3%).
Side by side
| ARM | WDC | |
|---|---|---|
| Market cap | $294B | $138B |
| Price | $266.28 | $397.28 |
| Today | −3.3% | +1.0% |
| Return YTD | +169.3% | +128.3% |
| Return 1Y | +84.7% | +224.6% |
| Since June 26, 2026 | −20.3% | −32.3% |
| P/E | 281.6 | 14.6 |
| P/S | 57.0 | 10.6 |
| P/B | 34.1 | 15.5 |
Data as of 2026-10-09 · 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
Arm HoldingsARM
Licensing, not manufacturing: the CPU architectures and instruction sets (Cortex, Neoverse) that nearly every mobile and server chip is built around come from Arm, which takes a royalty on each chip produced.
Full ARM profile →Western DigitalWDC
Hard drives for data centres, where AI has pushed demand for cheap bulk capacity to records.
Full WDC profile →More ARM & WDC comparisons
Other head-to-heads in the Chips & accelerators segment.