STK vs WDC: Correlation
Columbia Seligman Premium Technology Growth Fund Inc (STK) and Western Digital (WDC) show a strong relationship: their 3-year correlation of weekly returns is 0.61.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are STK and WDC?
On 3 years of weekly data the STK/WDC correlation comes out at 0.61, strong. Recent behaviour matches the longer record: 0.51 over 1 year against 0.61 over 3. The 5-year figure is 0.61, and annualized covariance runs at 928.1 %².
Within STK's tracked universe of 33 assets, WDC comes in at #16 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months WDC outperformed by 397.5 percentage points (+76.8% for STK against +474.3% for WDC). Risk is not evenly split, since WDC carries 2.2 times the volatility of the other side.
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.
STK vs WDC: side by side
| STK (Columbia Seligman Premium Technology Growth Fund Inc) | WDC (Western Digital) | |
|---|---|---|
| 1-year return | +76.8% | +474.3% |
| 5-year return | +153.2% | +889.2% |
| Volatility (ann.) | 26.4% | 58.0% |
| Beta vs S&P 500 | 1.51 | 2.15 |
| Max drawdown (3Y) | -26.6% | -49.6% |
| Market cap | – | $166.6B |
| P/E (trailing) | 5.9 | 17.4 |
| Dividend yield | 0.00% | 0.11% |
| Sector / category | US Listed | Information Technology |
Year-by-year returns
| Year | STK | WDC |
|---|---|---|
| 2022 | -30.4% | -51.6% |
| 2023 | +49.2% | +66.0% |
| 2024 | +17.7% | +13.9% |
| 2025 | +24.9% | +283.7% |
| 2026 | +47.2% | +168.4% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are STK and WDC good diversifiers for each other?
Only partially. A correlation of 0.61 means STK and WDC share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
FAQ
What is the correlation between STK and WDC?
As of 2026-08-27, the correlation of weekly returns between STK and WDC is 0.61 over 3 years, 0.51 over 1 year and 0.61 over 5 years.
Is WDC a good diversifier for STK?
Only partially. A correlation of 0.61 means STK and WDC share most of their swings. Pairing them dampens volatility somewhat, but it will not protect against a common drawdown.
What does a correlation of 0.61 mean?
On the −1 to +1 scale, 0.61 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/stk-vs-wdc.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/stk-vs-wdc/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: STK correlations · WDC correlations
