GILD vs IBB: Correlation
Gilead Sciences (GILD) and iShares Biotechnology ETF (IBB) show a moderate relationship: their 3-year correlation of weekly returns is 0.50.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are GILD and IBB?
Across a 3-year window, the weekly returns of GILD and IBB correlate at 0.50, moderate. Little has changed lately, as the 1-year reading of 0.49 lands near the 3-year figure. Stretching to 5 years gives 0.52, with an annualized covariance of 248.2 %².
In GILD's tracked universe of 30 assets, IBB sits right near the top at #1. Correlation aside, the last 12 months split them widely, with IBB ahead by 21.3 points (+34.1% versus +55.4%). Across three years, the rolling one-year figure varied moderately, from 0.38 to 0.63.
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.
GILD vs IBB: side by side
| GILD (Gilead Sciences) | IBB (iShares Biotechnology ETF) | |
|---|---|---|
| 1-year return | +34.1% | +55.4% |
| 5-year return | +148.1% | +26.6% |
| Volatility (ann.) | 24.1% | 20.7% |
| Beta vs S&P 500 | 0.33 | 0.81 |
| Max drawdown (3Y) | -26.6% | -24.9% |
| Market cap | $184.6B | – |
| P/E (trailing) | – | – |
| Dividend yield | 2.17% | 0.22% |
| Expense ratio | – | 0.44% |
| Assets under management | – | $9.2B |
| Sector / category | Health Care | ETF · Thematic |
IBB, iShares's Health fund, carries $9.2B under management, 235 holdings, a 0.44% expense ratio, a 0.22% trailing dividend yield.
Year-by-year returns
| Year | GILD | IBB |
|---|---|---|
| 2022 | +23.6% | -13.7% |
| 2023 | -2.0% | +3.8% |
| 2024 | +18.7% | -2.4% |
| 2025 | +36.6% | +28.0% |
| 2026 | +22.8% | +27.4% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Fund exposure
Keep in mind that IBB holds GILD at a 7.1% weight, which makes a slice of this correlation mechanical rather than coincidental.
Are GILD and IBB good diversifiers for each other?
To a limited degree. At 0.50 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 GILD and IBB?
Using weekly returns as of 2026-08-27: 0.50 over 3 years, with 0.49 over the last year and 0.52 over 5 years.
Is IBB a good diversifier for GILD?
To a limited degree. At 0.50 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 0.50 mean?
A reading of 0.50 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/gild-vs-ibb.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/gild-vs-ibb/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: GILD correlations · IBB correlations
