PDFS vs QQQ: Correlation
How closely do PDF Solutions, Inc. (PDFS) and Invesco QQQ Trust (QQQ) trade together? Their weekly returns over three years give a correlation of 0.50, which is moderate.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are PDFS and QQQ?
On 3 years of weekly data the PDFS/QQQ correlation comes out at 0.50, moderate. The relationship has been stable: the 1-year correlation (0.45) sits close to the 3-year figure. The 5-year figure is 0.53, and annualized covariance runs at 467.6 %².
Among the 16 assets we track against PDFS, QQQ ranks #9 by 3-year correlation. Their recent paths diverged sharply: over the last 12 months PDFS outperformed by 107.3 percentage points (+133.6% for PDFS against +26.3% for QQQ). Note the risk asymmetry: PDFS runs 2.4 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.
PDFS vs QQQ: side by side
| PDFS (PDF Solutions, Inc.) | QQQ (Invesco QQQ Trust) | |
|---|---|---|
| 1-year return | +133.6% | +26.3% |
| 5-year return | +105.9% | +95.4% |
| Volatility (ann.) | 47.4% | 19.6% |
| Beta vs S&P 500 | 1.55 | 1.28 |
| Max drawdown (3Y) | -58.5% | -22.8% |
| Market cap | $1.9B | – |
| P/E (trailing) | 177.5 | – |
| 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 | PDFS | QQQ |
|---|---|---|
| 2022 | -10.3% | -32.6% |
| 2023 | +12.7% | +54.9% |
| 2024 | -15.7% | +25.6% |
| 2025 | +5.4% | +20.8% |
| 2026 | +61.8% | +17.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are PDFS and QQQ good diversifiers for each other?
Somewhat, no more. With 0.50 correlation, most large moves hit both names, and the diversification benefit stays modest.
FAQ
What is the correlation between PDFS and QQQ?
Using weekly returns as of 2026-08-27: 0.50 over 3 years, with 0.45 over the last year and 0.53 over 5 years.
Is QQQ a good diversifier for PDFS?
Somewhat, no more. With 0.50 correlation, most large moves hit both names, and the diversification benefit stays modest.
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/pdfs-vs-qqq.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/pdfs-vs-qqq/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: PDFS correlations · QQQ correlations
