SPY vs TOMZ: Correlation
How closely do SPDR S&P 500 ETF Trust (SPY) and TOMI Environmental Solutions, Inc. (TOMZ) trade together? Their weekly returns over three years give a correlation of 0.21, which is weak.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are SPY and TOMZ?
On 3 years of weekly data the SPY/TOMZ correlation comes out at 0.21, weak. The relationship has been stable: the 1-year correlation (0.27) sits close to the 3-year figure. The 5-year figure is 0.21, and annualized covariance runs at 208.6 %².
Within SPY's tracked universe of 4755 assets, TOMZ comes in at #3188 by 3-year correlation. Correlation aside, the last 12 months split them widely, with SPY ahead by 49.5 points (+20.6% versus -28.9%). Risk is not evenly split, since TOMZ carries 4.8 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.
SPY vs TOMZ: side by side
| SPY (SPDR S&P 500 ETF Trust) | TOMZ (TOMI Environmental Solutions, Inc.) | |
|---|---|---|
| 1-year return | +20.6% | -28.9% |
| 5-year return | +82.4% | -66.5% |
| Volatility (ann.) | 14.5% | 68.9% |
| Beta vs S&P 500 | 1.00 | 1.00 |
| Max drawdown (3Y) | -18.8% | -61.6% |
| Market cap | – | – |
| P/E (trailing) | – | – |
| 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 | TOMZ |
|---|---|---|
| 2022 | -18.2% | -70.3% |
| 2023 | +26.2% | +106.1% |
| 2024 | +24.9% | +4.0% |
| 2025 | +17.7% | -25.7% |
| 2026 | +13.7% | -24.4% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are SPY and TOMZ good diversifiers for each other?
Reasonably. At 0.21, SPY and TOMZ keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between SPY and TOMZ?
Using weekly returns as of 2026-08-27: 0.21 over 3 years, with 0.27 over the last year and 0.21 over 5 years.
Is TOMZ a good diversifier for SPY?
Reasonably. At 0.21, SPY and TOMZ keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.21 mean?
Correlation ranges from −1 to +1. Values near +1 mean two assets move together, near 0 that they move independently, and negative values that they tend to move in opposite directions. It measures co-movement, not performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/spy-vs-tomz.json
Drop this badge in a README or notebook; it updates with the data:
[](https://www.pairbook.io/pair/spy-vs-tomz/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: SPY correlations · TOMZ correlations
