PTCT vs QQQ: Correlation
Measured on weekly returns over the past three years, PTC Therapeutics, Inc. (PTCT) and Invesco QQQ Trust (QQQ) carry a correlation of 0.34, a moderate link.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are PTCT and QQQ?
Over the past 3 years, PTCT and QQQ moved with a correlation of 0.34, which is moderate. Recent behaviour matches the longer record: 0.37 over 1 year against 0.34 over 3. Over 5 years the correlation is 0.34, and the annualized covariance of weekly returns is 346.6 %².
Within PTCT's tracked universe of 11 assets, QQQ comes in at #6 by 3-year correlation. The last year tells two different stories: PTCT led by 18.0 percentage points, +44.3% for PTCT against +26.3% for QQQ. One caveat on sizing: PTCT is 2.7 times as volatile as the other leg, so an equal-dollar split is far from equal-risk.
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.
PTCT vs QQQ: side by side
| PTCT (PTC Therapeutics, Inc.) | QQQ (Invesco QQQ Trust) | |
|---|---|---|
| 1-year return | +44.3% | +26.3% |
| 5-year return | +70.4% | +95.4% |
| Volatility (ann.) | 52.5% | 19.6% |
| Beta vs S&P 500 | 1.25 | 1.28 |
| Max drawdown (3Y) | -56.8% | -22.8% |
| Market cap | $6.0B | – |
| 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 | PTCT | QQQ |
|---|---|---|
| 2022 | -4.2% | -32.6% |
| 2023 | -27.8% | +54.9% |
| 2024 | +63.8% | +25.6% |
| 2025 | +68.3% | +20.8% |
| 2026 | -5.5% | +17.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are PTCT and QQQ good diversifiers for each other?
Yes, to a useful degree: a correlation of 0.34 leaves real independence between the two, which historically damped combined volatility.
FAQ
What is the correlation between PTCT and QQQ?
As of 2026-08-27, the correlation of weekly returns between PTCT and QQQ is 0.34 over 3 years, 0.37 over 1 year and 0.34 over 5 years.
Is QQQ a good diversifier for PTCT?
Yes, to a useful degree: a correlation of 0.34 leaves real independence between the two, which historically damped combined volatility.
What does a correlation of 0.34 mean?
A reading of 0.34 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/ptct-vs-qqq.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/ptct-vs-qqq/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: PTCT correlations · QQQ correlations
