RBBN vs SPY: Correlation
How closely do Ribbon Communications Inc. (RBBN) and SPDR S&P 500 ETF Trust (SPY) trade together? Their weekly returns over three years give a correlation of 0.48, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are RBBN and SPY?
Over the past 3 years, RBBN and SPY moved with a correlation of 0.48, which is moderate. Recent behaviour matches the longer record: 0.49 over 1 year against 0.48 over 3. Over 5 years the correlation is 0.40, and the annualized covariance of weekly returns is 348.7 %².
By 3-year correlation, SPY places #6 of the 11 assets tracked against RBBN. The last year tells two different stories: SPY led by 70.5 percentage points, -49.9% for RBBN against +20.6% for SPY. Note the risk asymmetry: RBBN runs 3.5 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.
RBBN vs SPY: side by side
| RBBN (Ribbon Communications Inc.) | SPY (SPDR S&P 500 ETF Trust) | |
|---|---|---|
| 1-year return | -49.9% | +20.6% |
| 5-year return | -69.7% | +82.4% |
| Volatility (ann.) | 50.8% | 14.5% |
| Beta vs S&P 500 | 1.67 | 1.00 |
| Max drawdown (3Y) | -62.1% | -18.8% |
| Market cap | $0.4B | – |
| P/E (trailing) | 25.0 | – |
| 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 | RBBN | SPY |
|---|---|---|
| 2022 | -53.9% | -18.2% |
| 2023 | +3.9% | +26.2% |
| 2024 | +43.4% | +24.9% |
| 2025 | -30.8% | +17.7% |
| 2026 | -30.6% | +13.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are RBBN and SPY good diversifiers for each other?
A fair diversifier. At 0.48, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
FAQ
What is the correlation between RBBN and SPY?
As of 2026-08-27, the correlation of weekly returns between RBBN and SPY is 0.48 over 3 years, 0.49 over 1 year and 0.40 over 5 years.
Is SPY a good diversifier for RBBN?
A fair diversifier. At 0.48, enough of each asset's movement is its own that the pair has smoothed outcomes historically.
What does a correlation of 0.48 mean?
Correlation ranges from −1 to +1. Values near +1 mean two assets move together, near 0 that they move independently, and negative values that they tend to move in opposite directions. It measures co-movement, not performance.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/rbbn-vs-spy.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/rbbn-vs-spy/)
Free with attribution; caching and terms are described in the API documentation.
Related comparisons
Hubs: RBBN correlations · SPY correlations
