BLK vs VOO: Correlation
BlackRock (BLK) and Vanguard S&P 500 ETF (VOO) show a strong relationship: their 3-year correlation of weekly returns is 0.69.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are BLK and VOO?
Across a 3-year window, the weekly returns of BLK and VOO correlate at 0.69, strong. Lately the two have drifted apart, with the 1-year correlation at 0.56 versus 0.69 over 3 years. Stretching to 5 years gives 0.77, with an annualized covariance of 246.5 %².
Within BLK's tracked universe of 42 assets, VOO comes in at #12 by 3-year correlation. Correlation aside, the last 12 months split them widely, with VOO ahead by 15.3 points (+5.3% versus +20.6%). The rolling one-year correlation moved between 0.53 and 0.84 over the past three years, a moderate range. Note the risk asymmetry: BLK runs 1.7 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.
BLK vs VOO: side by side
| BLK (BlackRock) | VOO (Vanguard S&P 500 ETF) | |
|---|---|---|
| 1-year return | +5.3% | +20.6% |
| 5-year return | +38.9% | +83.0% |
| Volatility (ann.) | 24.7% | 14.4% |
| Beta vs S&P 500 | 1.19 | 0.99 |
| Max drawdown (3Y) | -23.7% | -18.7% |
| Market cap | $189.7B | – |
| P/E (trailing) | 28.1 | – |
| Dividend yield | 1.86% | 1.07% |
| Expense ratio | – | 0.03% |
| Assets under management | – | $1,686.9B |
| Sector / category | Financials | ETF · US Large Cap |
VOO, Vanguard's Large Blend fund, carries $1,686.9B under management, 503 holdings, a 0.03% expense ratio, a 1.07% trailing dividend yield.
Year-by-year returns
| Year | BLK | VOO |
|---|---|---|
| 2022 | -20.4% | -18.2% |
| 2023 | +17.9% | +26.3% |
| 2024 | +29.3% | +25.0% |
| 2025 | +6.6% | +17.8% |
| 2026 | +10.3% | +13.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Fund exposure
A structural note: 0.24% of VOO is BLK itself, so the fund partly moves with the stock by construction.
Are BLK and VOO good diversifiers for each other?
To a limited degree. At 0.69 the two still catch most of the same waves, so the pair smooths returns a little without insulating either from a shared selloff.
FAQ
What is the correlation between BLK and VOO?
As of 2026-08-27, the correlation of weekly returns between BLK and VOO is 0.69 over 3 years, 0.56 over 1 year and 0.77 over 5 years.
Is VOO a good diversifier for BLK?
To a limited degree. At 0.69 the two still catch most of the same waves, so the pair smooths returns a little without insulating either from a shared selloff.
What does a correlation of 0.69 mean?
A reading of 0.69 sits on a scale from −1 (opposite moves) through 0 (unrelated) to +1 (identical moves). Correlation captures direction, not magnitude or performance.
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Related comparisons
Hubs: BLK correlations · VOO correlations
