CTSO vs QQQ: Correlation
How closely do Cytosorbents Corporation (CTSO) and Invesco QQQ Trust (QQQ) trade together? Their weekly returns over three years give a correlation of 0.20, which is weak.
Data as of 2026-08-27 · refreshed every trading day · weekly returns · methodology
How correlated are CTSO and QQQ?
Across a 3-year window, the weekly returns of CTSO and QQQ correlate at 0.20, weak. The link has tightened recently: the 1-year correlation (0.38) runs above the 3-year figure (0.20). Stretching to 5 years gives 0.20, with an annualized covariance of 289.8 %².
Out of 10 assets tracked against CTSO, QQQ lands near the bottom at #6. Their recent paths diverged sharply: over the last 12 months QQQ outperformed by 89.7 percentage points (-63.4% for CTSO against +26.3% for QQQ). Risk is not evenly split, since CTSO carries 3.9 times the volatility of the other side.
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.
CTSO vs QQQ: side by side
| CTSO (Cytosorbents Corporation) | QQQ (Invesco QQQ Trust) | |
|---|---|---|
| 1-year return | -63.4% | +26.3% |
| 5-year return | -96.4% | +95.4% |
| Volatility (ann.) | 75.9% | 19.6% |
| Beta vs S&P 500 | 0.98 | 1.28 |
| Max drawdown (3Y) | -87.9% | -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 | CTSO | QQQ |
|---|---|---|
| 2022 | -63.0% | -32.6% |
| 2023 | -28.4% | +54.9% |
| 2024 | -18.0% | +25.6% |
| 2025 | -29.8% | +20.8% |
| 2026 | -46.7% | +17.7% |
Calendar-year price returns; the current year is year-to-date as of the data date above.
Are CTSO and QQQ good diversifiers for each other?
Yes, to a useful degree: a correlation of 0.20 leaves real independence between the two, which historically damped combined volatility.
FAQ
What is the correlation between CTSO and QQQ?
The CTSO/QQQ correlation stands at 0.20 on a 3-year window (1 year: 0.38, 5 years: 0.20), computed from weekly returns as of 2026-08-27.
Is QQQ a good diversifier for CTSO?
Yes, to a useful degree: a correlation of 0.20 leaves real independence between the two, which historically damped combined volatility.
What does a correlation of 0.20 mean?
On the −1 to +1 scale, 0.20 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/ctso-vs-qqq.json
Embed this badge (it refreshes with the data), with attribution:
[](https://www.pairbook.io/pair/ctso-vs-qqq/)
No key needed, free to use. Full endpoint list in the API documentation.
Related comparisons
Hubs: CTSO correlations · QQQ correlations
