NEU vs SEIC: Correlation
Measured on weekly returns over the past three years, NewMarket Corp (NEU) and SEI Investments Company (SEIC) carry a correlation of 0.43, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are NEU and SEIC?
On 3 years of weekly data the NEU/SEIC correlation comes out at 0.43, moderate. Little has changed lately, as the 1-year reading of 0.41 lands near the 3-year figure. The 5-year figure is 0.41, and annualized covariance runs at 249.5 %².
In NEU's tracked universe of 10 assets, SEIC sits right near the top at #3. On 12-month performance SEIC holds a 10.3-point edge, +14.1% against +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.
NEU vs SEIC: side by side
| NEU (NewMarket Corp) | SEIC (SEI Investments Company) | |
|---|---|---|
| 1-year return | +14.1% | +24.4% |
| 5-year return | +195.8% | +89.5% |
| Volatility (ann.) | 27.9% | 20.7% |
| Beta vs S&P 500 | 0.58 | 0.91 |
| Max drawdown (3Y) | -32.8% | -23.3% |
| Market cap | $8.5B | $13.4B |
| P/E (trailing) | 19.9 | 19.6 |
| Dividend yield | 1.27% | 0.94% |
| Sector / category | US Listed | US Listed |
Year-by-year returns
| Year | NEU | SEIC |
|---|---|---|
| 2022 | -6.7% | -2.9% |
| 2023 | +79.1% | +10.6% |
| 2024 | -1.5% | +31.5% |
| 2025 | +32.3% | +0.6% |
| 2026 | +35.6% | +36.5% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are NEU and SEIC good diversifiers for each other?
Reasonably. At 0.43, NEU and SEIC keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between NEU and SEIC?
Using weekly returns as of 2026-08-27: 0.43 over 3 years, with 0.41 over the last year and 0.41 over 5 years.
Is SEIC a good diversifier for NEU?
Reasonably. At 0.43, NEU and SEIC keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.43 mean?
A reading of 0.43 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/neu-vs-seic.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/neu-vs-seic/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: NEU correlations · SEIC correlations
