PETS vs QQQ: Correlation
PetMed Express, Inc. (PETS) and Invesco QQQ Trust (QQQ) show a weak relationship: their 3-year correlation of weekly returns is 0.17.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are PETS and QQQ?
On 3 years of weekly data the PETS/QQQ correlation comes out at 0.17, weak. The relationship has been stable: the 1-year correlation (0.10) sits close to the 3-year figure. The 5-year figure is 0.21, and annualized covariance runs at 239.9 %².
QQQ is close to the least connected end of PETS's tracked universe, ranking #7 of 10. Correlation aside, the last 12 months split them widely, with QQQ ahead by 67.8 points (-41.5% versus +26.3%). Note the risk asymmetry: PETS runs 3.7 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.
PETS vs QQQ: side by side
| PETS (PetMed Express, Inc.) | QQQ (Invesco QQQ Trust) | |
|---|---|---|
| 1-year return | -41.5% | +26.3% |
| 5-year return | -92.7% | +95.4% |
| Volatility (ann.) | 72.9% | 19.6% |
| Beta vs S&P 500 | 1.10 | 1.28 |
| Max drawdown (3Y) | -86.3% | -22.8% |
| Market cap | – | – |
| P/E (trailing) | – | – |
| Dividend yield | 0.00% | 0.44% |
| Expense ratio | – | 0.18% |
| Assets under management | – | $452.8B |
| Sector / category | US Listed | ETF · US Growth & Tech |
QQQ is a Large Growth fund from Invesco: $452.8B under management, 104 holdings, a 0.18% expense ratio, a 0.44% trailing dividend yield.
Year-by-year returns
| Year | PETS | QQQ |
|---|---|---|
| 2022 | -25.8% | -32.6% |
| 2023 | -54.8% | +54.9% |
| 2024 | -36.2% | +25.6% |
| 2025 | -33.6% | +20.8% |
| 2026 | -42.2% | +17.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are PETS and QQQ good diversifiers for each other?
Yes: at 0.17, the two have gone their own ways historically, which is what genuine diversification looks like.
FAQ
What is the correlation between PETS and QQQ?
As of 2026-08-27, the correlation of weekly returns between PETS and QQQ is 0.17 over 3 years, 0.10 over 1 year and 0.21 over 5 years.
Is QQQ a good diversifier for PETS?
Yes: at 0.17, the two have gone their own ways historically, which is what genuine diversification looks like.
What does a correlation of 0.17 mean?
On the −1 to +1 scale, 0.17 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.
Use this data
$ curl https://www.pairbook.io/api/v1/pairs/pets-vs-qqq.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/pets-vs-qqq/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: PETS correlations · QQQ correlations
