BND vs FZROX: 1% overlap
Vanguard Total Bond Market ETF and Fidelity ZERO Total Market Index share 0.6% of their portfolios by weight — computed as Σ min(wA, wB) over every holding both funds own.
Different holding dates. These holdings were published about 2 months apart — FZROX as of 2026-04-30, the rest through 2026-06-30. Each fund is compared using its most recent file, so any trading in between shows up as a difference.
You would hold two tickers and get the diversification of 2.0. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
BND and FZROX hold 1 of the same securities. The ten contributing most to the overlap figure:
| Holding | in BND | in FZROX | Δ |
|---|---|---|---|
| CASH | 1.1% | 0.6% | 0.5% |
Where BND and FZROX differ
Sector weights as a share of each fund, ordered by the size of the gap rather than the size of the sector — two funds that overlap heavily still usually diverge somewhere.
| Sector | BND | FZROX | Δ |
|---|---|---|---|
| Treasuries | 48.2% | 0.0% | +48.2pp |
| Information Technology | 0.0% | 32.3% | −32.3pp |
| MBS Pass-Through | 20.3% | 0.0% | +20.3pp |
| Corporate — industrial & other | 14.6% | 0.0% | +14.6pp |
| Communication Services | 0.0% | 10.1% | −10.1pp |
| Consumer Discretionary | 0.0% | 9.6% | −9.6pp |
| Industrials | 0.0% | 9.2% | −9.2pp |
| Health Care | 0.0% | 8.6% | −8.6pp |
Δ is BND minus FZROX, in percentage points. Sector data is not published by every issuer, so “Unclassified” is a real category rather than a gap in the table.
What each fund holds alone
98.9% of BND by weight, held in no part of FZROX.
99.7% of FZROX by weight, held in no part of BND.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| BND | FZROX | |
|---|---|---|
| Top 10 holdings | 71.7% | 34.0% |
| Positions held | 2,047 | 2,685 |
| Cost per $10,000 held, per year | $3 | $0 |
Cost is the expense ratio applied to $10,000; it excludes any brokerage commission, bid-ask spread or tax consequence. Figures are facts about the funds, not a suggestion about which to hold.
Frequently asked
How much do BND and FZROX overlap?
BND and FZROX overlap 0.6% by portfolio weight — largely distinct portfolios. They share 1 holdings. The figure comes from current issuer holdings files (BND as of 2026-06-30, FZROX as of 2026-04-30).
How is the overlap between BND and FZROX calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If BND holds a stock at 6% and FZROX holds the same stock at 4%, 4% counts as shared. The result is bounded between 0% and 100%, and it is computed after looking through any fund-of-funds to the underlying holdings.
Is it redundant to hold both BND and FZROX?
That depends on your goals — we state facts, not advice. At 0.6% overlap, each fund still contributes meaningfully distinct exposure.
What does BND own that FZROX doesn't?
BND holds 2,047 positions and FZROX holds 2,685; 2,046 of BND's positions don't appear in FZROX at all, and they are 98.9% of BND by weight.
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Related comparisons
Sources: issuer holdings files, BND as of 2026-06-30, FZROX as of 2026-04-30. Weights are fractions of each fund. Diagnostics, not advice.