STK vs XLK: Correlation
How closely do Columbia Seligman Premium Technology Growth Fund Inc (STK) and Technology Select Sector SPDR Fund (XLK) trade together? Their weekly returns over three years give a correlation of 0.85, which is very strong.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are STK and XLK?
On 3 years of weekly data the STK/XLK correlation comes out at 0.85, very strong, meaning they move nearly in lockstep. Little has changed lately, as the 1-year reading of 0.83 lands near the 3-year figure. The 5-year figure is 0.85, and annualized covariance runs at 535.9 %².
In STK's tracked universe of 33 assets, XLK sits right near the top at #3. The last year tells two different stories: STK led by 33.4 percentage points, +76.8% for STK against +43.4% for XLK.
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 XLK: side by side
| STK (Columbia Seligman Premium Technology Growth Fund Inc) | XLK (Technology Select Sector SPDR Fund) | |
|---|---|---|
| 1-year return | +76.8% | +43.4% |
| 5-year return | +153.2% | +145.2% |
| Volatility (ann.) | 26.4% | 24.0% |
| Beta vs S&P 500 | 1.51 | 1.50 |
| Max drawdown (3Y) | -26.6% | -25.7% |
| Market cap | – | – |
| P/E (trailing) | 5.9 | – |
| Dividend yield | 0.00% | 0.45% |
| Expense ratio | – | 0.08% |
| Assets under management | – | $115.4B |
| Sector / category | US Listed | Sector ETF |
On the fund side, XLK sits in the Technology category at State Street Investment Management, with $115.4B under management, 73 holdings, a 0.08% expense ratio, a 0.45% trailing dividend yield.
Year-by-year returns
| Year | STK | XLK |
|---|---|---|
| 2022 | -30.4% | -27.7% |
| 2023 | +49.2% | +56.0% |
| 2024 | +17.7% | +21.6% |
| 2025 | +24.9% | +24.6% |
| 2026 | +47.2% | +31.3% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are STK and XLK good diversifiers for each other?
Not really. At 0.85, the two trade almost as one position, and owning both buys little extra protection.
FAQ
What is the correlation between STK and XLK?
The STK/XLK correlation stands at 0.85 on a 3-year window (1 year: 0.83, 5 years: 0.85), computed from weekly returns as of 2026-08-27.
Is XLK a good diversifier for STK?
Not really. At 0.85, the two trade almost as one position, and owning both buys little extra protection.
What does a correlation of 0.85 mean?
A reading of 0.85 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/stk-vs-xlk.json
Markdown for the live badge, attribution link included:
[](https://www.pairbook.io/pair/stk-vs-xlk/)
The core API is free. Terms and every endpoint in the API documentation.
Related comparisons
Hubs: STK correlations · XLK correlations
