STX vs WDC: Correlation
Seagate Technology (STX) and Western Digital (WDC) show a very strong relationship: their 3-year correlation of weekly returns is 0.83.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are STX and WDC?
Across a 3-year window, the weekly returns of STX and WDC correlate at 0.83, very strong, meaning they move nearly in lockstep. Recent behaviour matches the longer record: 0.86 over 1 year against 0.83 over 3. Stretching to 5 years gives 0.80, with an annualized covariance of 2467.9 %².
Few assets follow STX as closely as WDC, which ranks #1 of 37 tracked partners. Their recent paths diverged sharply: over the last 12 months WDC outperformed by 63.5 percentage points (+410.8% for STX against +474.3% for WDC). Across three years, the rolling one-year figure varied moderately, from 0.66 to 0.91.
How is this computed?
Pearson correlation on weekly returns: ρ(A,B) = cov(rA, rB) / (σA · σB), over windows of 52, 156 and 260 weeks. Covariance is annualized (×52) and expressed in %². Full definitions on the methodology page.
STX vs WDC: side by side
| STX (Seagate Technology) | WDC (Western Digital) | |
|---|---|---|
| 1-year return | +410.8% | +474.3% |
| 5-year return | +1032.5% | +889.2% |
| Volatility (ann.) | 51.3% | 58.0% |
| Beta vs S&P 500 | 1.97 | 2.15 |
| Max drawdown (3Y) | -40.0% | -49.6% |
| Market cap | $192.0B | $166.6B |
| P/E (trailing) | 61.0 | 17.4 |
| Dividend yield | 0.35% | 0.11% |
| Sector / category | Information Technology | Information Technology |
Year-by-year returns
| Year | STX | WDC |
|---|---|---|
| 2022 | -51.4% | -51.6% |
| 2023 | +69.1% | +66.0% |
| 2024 | +4.1% | +13.9% |
| 2025 | +225.3% | +283.7% |
| 2026 | +208.4% | +168.4% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are STX and WDC good diversifiers for each other?
No. With a correlation of 0.83, STX and WDC move nearly in lockstep, so holding both adds very little diversification.
FAQ
What is the correlation between STX and WDC?
As of 2026-08-27, the correlation of weekly returns between STX and WDC is 0.83 over 3 years, 0.86 over 1 year and 0.80 over 5 years.
Is WDC a good diversifier for STX?
No. With a correlation of 0.83, STX and WDC move nearly in lockstep, so holding both adds very little diversification.
What does a correlation of 0.83 mean?
On the −1 to +1 scale, 0.83 describes how much the two returns move together: +1 is lockstep, 0 is independence, negative values mean opposite directions. It says nothing about which performed better.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/stx-vs-wdc.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/stx-vs-wdc/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: STX correlations · WDC correlations
