NDAQ vs SEIC: Correlation
Nasdaq, Inc. (NDAQ) and SEI Investments Company (SEIC) show a moderate relationship: their 3-year correlation of weekly returns is 0.56.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are NDAQ and SEIC?
On 3 years of weekly data the NDAQ/SEIC correlation comes out at 0.56, moderate. Little has changed lately, as the 1-year reading of 0.50 lands near the 3-year figure. The 5-year figure is 0.59, and annualized covariance runs at 267.2 %².
Among the 35 assets we track against NDAQ, SEIC ranks #6 by 3-year correlation. Correlation aside, the last 12 months split them widely, with SEIC ahead by 18.3 points (+6.1% versus +24.4%).
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.
NDAQ vs SEIC: side by side
| NDAQ (Nasdaq, Inc.) | SEIC (SEI Investments Company) | |
|---|---|---|
| 1-year return | +6.1% | +24.4% |
| 5-year return | +64.4% | +89.5% |
| Volatility (ann.) | 23.2% | 20.7% |
| Beta vs S&P 500 | 0.80 | 0.91 |
| Max drawdown (3Y) | -23.4% | -23.3% |
| Market cap | $55.5B | $13.4B |
| P/E (trailing) | 29.0 | 19.6 |
| Dividend yield | 1.13% | 0.94% |
| Sector / category | Financials | US Listed |
Year-by-year returns
| Year | NDAQ | SEIC |
|---|---|---|
| 2022 | -11.2% | -2.9% |
| 2023 | -3.7% | +10.6% |
| 2024 | +34.8% | +31.5% |
| 2025 | +27.2% | +0.6% |
| 2026 | +3.0% | +36.5% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are NDAQ and SEIC good diversifiers for each other?
To a limited degree. At 0.56 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 NDAQ and SEIC?
Using weekly returns as of 2026-08-27: 0.56 over 3 years, with 0.50 over the last year and 0.59 over 5 years.
Is SEIC a good diversifier for NDAQ?
To a limited degree. At 0.56 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 0.56 mean?
On the −1 to +1 scale, 0.56 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: NDAQ correlations · SEIC correlations
