INTZ vs SPY: Correlation
How closely do Intrusion Inc. (INTZ) and SPDR S&P 500 ETF Trust (SPY) trade together? Their weekly returns over three years give a correlation of 0.12, which is weak.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are INTZ and SPY?
On 3 years of weekly data the INTZ/SPY correlation comes out at 0.12, weak. The past 12 months show a tighter link (0.32) than the 3-year average (0.12). The 5-year figure is 0.10, and annualized covariance runs at 497.7 %².
SPY is close to the least connected end of INTZ's tracked universe, ranking #28 of 31. The last year tells two different stories: SPY led by 76.6 percentage points, -56.0% for INTZ against +20.6% for SPY. Note the risk asymmetry: INTZ runs 19.4 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.
INTZ vs SPY: side by side
| INTZ (Intrusion Inc.) | SPY (SPDR S&P 500 ETF Trust) | |
|---|---|---|
| 1-year return | -56.0% | +20.6% |
| 5-year return | -99.1% | +82.4% |
| Volatility (ann.) | 281.6% | 14.5% |
| Beta vs S&P 500 | 2.38 | 1.00 |
| Max drawdown (3Y) | -97.9% | -18.8% |
| Market cap | – | – |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 1.01% |
| Expense ratio | – | 0.09% |
| Assets under management | – | $795.3B |
| Sector / category | US Listed | ETF · US Large Cap |
SPY is a Large Blend fund from State Street Investment Management: $795.3B under management, 504 holdings, a 0.09% expense ratio, a 1.01% trailing dividend yield.
Year-by-year returns
| Year | INTZ | SPY |
|---|---|---|
| 2022 | -8.1% | -18.2% |
| 2023 | -92.1% | +26.2% |
| 2024 | -38.4% | +24.9% |
| 2025 | -62.7% | +17.7% |
| 2026 | -29.6% | +13.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are INTZ and SPY good diversifiers for each other?
By historical standards, yes. A correlation of 0.12 means the two rarely move for the same reasons.
FAQ
What is the correlation between INTZ and SPY?
The INTZ/SPY correlation stands at 0.12 on a 3-year window (1 year: 0.32, 5 years: 0.10), computed from weekly returns as of 2026-08-27.
Is SPY a good diversifier for INTZ?
By historical standards, yes. A correlation of 0.12 means the two rarely move for the same reasons.
What does a correlation of 0.12 mean?
On the −1 to +1 scale, 0.12 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.
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Related comparisons
Hubs: INTZ correlations · SPY correlations
