QQQ vs VOO vs VUG: 1.9 Effective Funds
Held in equal weight, QQQ, VOO, VUG behave like 1.9 funds rather than 3. Every figure below is computed from the funds' current published holdings.
Different holding dates. These holdings were published 38 days apart — VOO, VUG as of 2026-07-31, the rest through 2026-09-07. Each fund is compared using its most recent file, so any trading in between shows up as a difference.
Three tickers, and the diversification of 1.9. Three funds sharing nothing would score 3.0; three identical funds score 1.0.
How the three compare
Where the duplication is
The combined figure above hides which pair is responsible. Each row is the overlap between two of the three, computed as Σ min(wA, wB).
| Pair | Overlap | |
|---|---|---|
| QQQ vs VOO | 53.5% | |
| QQQ vs VUG | 59.6% | |
| VOO vs VUG | 57.1% |
The most duplicated pair is QQQ and VUG at 59.6%.
Held by all three
The ten largest of the positions that appear in QQQ, VOO, VUG together — 46.2% of a portfolio split equally between them, by the same min-sum rule.
| Holding | Smallest of the three weights |
|---|---|
| NVDA | 7.55% |
| AAPL | 7.05% |
| MSFT | 5.36% |
| AMZN | 4.13% |
| GOOGL | 3.13% |
| AVGO | 2.69% |
| GOOG | 2.62% |
| META | 1.90% |
| TSLA | 1.36% |
| AMD | 1.21% |
Frequently asked
How much do QQQ, VOO, VUG overlap?
Held in equal weight, QQQ, VOO, VUG behave like 1.9 funds rather than 3. QQQ and VOO overlap 53.5%; QQQ and VUG overlap 59.6%; VOO and VUG overlap 57.1%. Each figure is the sum of the smaller weight in each fund over every holding both own.
Which two of QQQ, VOO, VUG are most alike?
QQQ and VUG, at 59.6% by weight. That pair contributes most of the duplication in the combined figure above.
What does "1.9 Effective Funds" mean?
It is the number of genuinely independent funds this combination behaves like. Three funds sharing no holdings would score 3.0; three identical funds score 1.0. It is computed from the pairwise overlaps above, weighting each fund equally, and it is a measurement rather than a target — what counts as enough depends on what you were trying to do.
These are three funds. How many do you actually hold?
This page assumes an equal split between QQQ, VOO, VUG. Paste your real holdings — every account, in the proportions you actually own them — for your own Effective Funds number, the companies underneath, and what else is duplicated. Free, no account, nothing stored.
X-ray my portfolio — free →Watch QQQ vs VOO vs VUG
We re-read both funds’ published holdings every weeknight. Leave an address and we'll tell you when what's inside actually changes.
Not sending yet — email alerts are built but switched off, and you'll be among the first when they turn on. No spam, one-click unsubscribe.
Sources: issuer holdings files, QQQ as of 2026-09-07, VOO as of 2026-07-31, VUG as of 2026-07-31. Weights are fractions of each fund. Diagnostics, not advice.