Monolithic Powervs.Western Digital
MPWR 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.
Western Digital is about 2.0× larger than Monolithic Power by market cap; Western Digital trades at the lower P/E (14.6 vs 84.5); year to date, Western Digital leads (+128.3% vs +51.1%).
Side by side
| MPWR | WDC | |
|---|---|---|
| Market cap | $68B | $138B |
| Price | $1,386.29 | $397.28 |
| Today | +1.2% | +1.0% |
| Return YTD | +51.1% | +128.3% |
| Return 1Y | +39.6% | +224.6% |
| Since July 2, 2026 | +7.6% | −26.3% |
| P/E | 84.5 | 14.6 |
| P/S | 20.8 | 10.6 |
| P/B | 17.4 | 15.5 |
Data as of 2026-10-09 · updates daily after U.S. close
Since July 2, 2026: the change in the closing price from the first session with a close for both companies. Sectivia records these closes itself, starting June 26, 2026.
The two companies
Monolithic PowerMPWR
Everything here is power delivery: the chips and modules that feed processors in AI server racks, with cars and industrial equipment taking the same parts.
Full MPWR profile →Western DigitalWDC
Hard drives for data centres, where AI has pushed demand for cheap bulk capacity to records.
Full WDC profile →More MPWR & WDC comparisons
Other head-to-heads in the Chips & accelerators segment.