SPY vs STK: Correlation
SPDR S&P 500 ETF Trust (SPY) and Columbia Seligman Premium Technology Growth Fund Inc (STK) 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 SPY and STK?
Across a 3-year window, the weekly returns of SPY and STK correlate at 0.83, very strong, meaning they move nearly in lockstep. Little has changed lately, as the 1-year reading of 0.85 lands near the 3-year figure. Stretching to 5 years gives 0.83, with an annualized covariance of 316.0 %².
By 3-year correlation, STK places #43 of the 4755 assets tracked against SPY. The last year tells two different stories: STK led by 56.2 percentage points, +20.6% for SPY against +76.8% for STK. Note the risk asymmetry: STK runs 1.8 times the annualized volatility of the other leg, so equal-weighting the two is not an equal-risk position.
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.
SPY vs STK: side by side
| SPY (SPDR S&P 500 ETF Trust) | STK (Columbia Seligman Premium Technology Growth Fund Inc) | |
|---|---|---|
| 1-year return | +20.6% | +76.8% |
| 5-year return | +82.4% | +153.2% |
| Volatility (ann.) | 14.5% | 26.4% |
| Beta vs S&P 500 | 1.00 | 1.51 |
| Max drawdown (3Y) | -18.8% | -26.6% |
| Market cap | – | – |
| P/E (trailing) | – | 5.9 |
| Dividend yield | 1.01% | 0.00% |
| Expense ratio | 0.09% | – |
| Assets under management | $795.3B | – |
| Sector / category | ETF · US Large Cap | US Listed |
On the fund side, SPY sits in the Large Blend category at State Street Investment Management, with $795.3B under management, 504 holdings, a 0.09% expense ratio, a 1.01% trailing dividend yield.
Year-by-year returns
| Year | SPY | STK |
|---|---|---|
| 2022 | -18.2% | -30.4% |
| 2023 | +26.2% | +49.2% |
| 2024 | +24.9% | +17.7% |
| 2025 | +17.7% | +24.9% |
| 2026 | +13.7% | +47.2% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are SPY and STK good diversifiers for each other?
Not really. At 0.83, the two trade almost as one position, and owning both buys little extra protection.
FAQ
What is the correlation between SPY and STK?
The SPY/STK correlation stands at 0.83 on a 3-year window (1 year: 0.85, 5 years: 0.83), computed from weekly returns as of 2026-08-27.
Is STK a good diversifier for SPY?
Not really. At 0.83, the two trade almost as one position, and owning both buys little extra protection.
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/spy-vs-stk.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/spy-vs-stk/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: SPY correlations · STK correlations
