ADTN vs SPY: Correlation
Measured on weekly returns over the past three years, ADTRAN Holdings, Inc. (ADTN) and SPDR S&P 500 ETF Trust (SPY) carry a correlation of 0.40, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are ADTN and SPY?
Over the past 3 years, ADTN and SPY moved with a correlation of 0.40, which is moderate. The past 12 months show a weaker link (0.27) than the 3-year average (0.40). Over 5 years the correlation is 0.37, and the annualized covariance of weekly returns is 322.9 %².
Among the 12 assets we track against ADTN, SPY ranks #7 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months SPY outperformed by 37.2 percentage points (-16.6% for ADTN against +20.6% for SPY). Note the risk asymmetry: ADTN runs 3.9 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.
ADTN vs SPY: side by side
| ADTN (ADTRAN Holdings, Inc.) | SPY (SPDR S&P 500 ETF Trust) | |
|---|---|---|
| 1-year return | -16.6% | +20.6% |
| 5-year return | -60.1% | +82.4% |
| Volatility (ann.) | 56.4% | 14.5% |
| Beta vs S&P 500 | 1.55 | 1.00 |
| Max drawdown (3Y) | -61.3% | -18.8% |
| Market cap | $0.6B | – |
| P/E (trailing) | – | – |
| 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 | ADTN | SPY |
|---|---|---|
| 2022 | -16.3% | -18.2% |
| 2023 | -59.9% | +26.2% |
| 2024 | +13.5% | +24.9% |
| 2025 | +4.3% | +17.7% |
| 2026 | -10.4% | +13.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are ADTN and SPY good diversifiers for each other?
Reasonably. At 0.40, ADTN and SPY keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
FAQ
What is the correlation between ADTN and SPY?
Using weekly returns as of 2026-08-27: 0.40 over 3 years, with 0.27 over the last year and 0.37 over 5 years.
Is SPY a good diversifier for ADTN?
Reasonably. At 0.40, ADTN and SPY keep a meaningful degree of independence, and combining them has historically reduced portfolio volatility.
What does a correlation of 0.40 mean?
On the −1 to +1 scale, 0.40 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: ADTN correlations · SPY correlations
