Overlap · from SEC filings
BND vs QQQ: what actually overlaps
BND and QQQ: 0% of a dollar ends up in the same companies either way (SEC Form N-PORT, 2026-06-30), across 0 securities the two funds both hold. Every free comparison tool can list the tickers in common; this weights them, which is the part that decides whether owning both changes anything.
The short version
Held alone, BND behaves like 877.7 equally weighted positions and QQQ like 34.1. Held together in equal size they behave like 131.4 — less diversified than holding BND on its own — but not because the two funds overlap, since they share no securities at all. Effective holdings weights by money, and half of it now sits in QQQ, which behaves like 34.1 on its own. That is what pulls the blend down.
Overlap here is the sum, over securities both funds hold, of the smaller of the two weights: the share of a dollar that sits in the same company either way. Matching is on CUSIP. Figures are as of each fund's own reporting date (2026-06-30 and 2026-06-30), which do not always align.
Not 50/50, or holding a third fund alongside these two? The portfolio calculator runs this same math for any weights, across up to 12 funds.
Side by side
as filed| BND | QQQ | |
|---|---|---|
| Assets | $402B | $492B |
| Holdings | 10,977 | 103 |
| Effective holdings | 877.7 | 34.1 |
| Top ten weight | 4.63% | 45.03% |
| Largest position | 0.9% | 7.6% |
| Priced at market (Level 1) | 0.9% | 99.65% |
| Reporting date | 2026-06-30 | 2026-06-30 |
What the difference is made of
98.24% · 100%98.24% of BND sits in companies QQQ does not hold at all, and 100% of QQQ in companies BND does not hold. The largest of each, by weight in its own fund:
- Vanguard Cmt Funds-Vanguard Market Liquidity Fund
- United States Treasury Note/Bond
- United States Treasury Note/Bond
- United States Treasury Note/Bond
- United States Treasury Note/Bond
- NVIDIA Corp.
- Apple Inc.
- Micron Technology, Inc.
- Microsoft Corp.
- Advanced Micro Devices, Inc.
By country of issuer
2026-06-30Where each fund's money sits by the issuer country its filer reported (incorporation, not revenue). Two funds can share companies and still differ here, and a pair that looks diversified by name can be one country twice.
| Country | BND | QQQ | Difference |
|---|---|---|---|
| United States | 93.32% | 94.64% | −1.32 |
| Ireland° | 0.15% | 1.98% | −1.83 |
| Netherlands° | 0.19% | 1.58% | −1.39 |
| Not stated in filing | 1.42% | 0.00% | +1.42 |
| Canada | 1.08% | 0.74% | +0.34 |
| United Kingdom | 0.83% | 0.85% | −0.02 |
| Japan | 0.54% | 0.00% | +0.54 |
| Mexico | 0.36% | 0.00% | +0.36 |
| Germany | 0.32% | 0.00% | +0.32 |
| Cayman Islands° | 0.10% | 0.22% | −0.12 |
What each fund did last quarter
Each fund's newest filing against its previous one. A pair whose overlap is rising or falling does so because of these moves; the figures are the same ones on each fund's page and in its feed.
Related comparisons
8Other pairs involving BND or QQQ, ordered by how much they overlap.
| Pair | Overlap | Combined effective |
|---|---|---|
| QQQ vs QQQM | 91.56% | 33.2 |
| AGG vs BND | 63.53% | 837.5 |
| QQQ vs VUG | 59.22% | 27.7 |
| QQQ vs XLK | 56.76% | 24.8 |
| QQQ vs VOO | 54.46% | 44.2 |
| IVV vs QQQ | 53.66% | 44.2 |
| QQQ vs VGT | 50.6% | 24.3 |
| QQQ vs VTI | 48.13% | 49.4 |
Sources and limits
Computed from SEC Form N-PORT (NPORT-P), the portfolio report every registered US fund files. Positions below 0.001% of net assets are dropped; weights are normalised to each filing's own total.
Unit investment trusts including SPY and DIA do not file N-PORT, so no overlap can be computed for them. Where a comparison is missing from this site, that is usually why rather than an oversight.
Overlap says what is held in common, not what will move together. Two funds with no shared holdings can still fall together, and the effective holding count takes no account of correlation. All 275 pairs are in the concentration dataset, and every fund's own history is on its fund page.