BOSC vs SPY: Correlation
Measured on weekly returns over the past three years, B.O.S. Better Online Solutions (BOSC) and SPDR S&P 500 ETF Trust (SPY) carry a correlation of 0.26, a weak link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BOSC and SPY?
Across a 3-year window, the weekly returns of BOSC and SPY correlate at 0.26, weak. Lately the two have drifted apart, with the 1-year correlation at 0.07 versus 0.26 over 3 years. Stretching to 5 years gives 0.27, with an annualized covariance of 127.8 %².
Out of 10 assets tracked against BOSC, SPY lands near the bottom at #6. Their recent paths diverged sharply: over the last 12 months SPY outperformed by 24.7 percentage points (-4.1% for BOSC against +20.6% for SPY). One caveat on sizing: BOSC is 2.3 times as volatile as the other leg, so an equal-dollar split is far from equal-risk.
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.
BOSC vs SPY: side by side
| BOSC (B.O.S. Better Online Solutions) | SPY (SPDR S&P 500 ETF Trust) | |
|---|---|---|
| 1-year return | -4.1% | +20.6% |
| 5-year return | +15.6% | +82.4% |
| Volatility (ann.) | 34.0% | 14.5% |
| Beta vs S&P 500 | 0.61 | 1.00 |
| Max drawdown (3Y) | -39.1% | -18.8% |
| Market cap | – | – |
| P/E (trailing) | 8.8 | – |
| 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 | BOSC | SPY |
|---|---|---|
| 2022 | -28.9% | -18.2% |
| 2023 | +26.3% | +26.2% |
| 2024 | +25.0% | +24.9% |
| 2025 | +38.2% | +17.7% |
| 2026 | +2.6% | +13.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are BOSC and SPY good diversifiers for each other?
A fair diversifier. At 0.26, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between BOSC and SPY?
As of 2026-08-27, the correlation of weekly returns between BOSC and SPY is 0.26 over 3 years, 0.07 over 1 year and 0.27 over 5 years.
Is SPY a good diversifier for BOSC?
A fair diversifier. At 0.26, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.26 mean?
A reading of 0.26 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/bosc-vs-spy.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/bosc-vs-spy/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: BOSC correlations · SPY correlations
