BIV vs VFIFX: 4% overlap
Vanguard Intermediate-Term Bond ETF and Vanguard Target Retirement 2050 share 4.1% 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 3 months apart — VFIFX as of 2026-03-31, 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
BIV and VFIFX hold 839 of the same securities. The ten contributing most to the overlap figure:
| Holding | in BIV | in VFIFX | Δ |
|---|---|---|---|
| UST-3-10Y | 55.9% | 1.6% | 54.4% |
| AGENCY-MBS | 0.3% | 1.5% | 1.2% |
| CASH | 0.3% | 1.9% | 1.6% |
| 46647P | 1.1% | 0.0% | 1.0% |
| 06051G | 0.9% | 0.0% | 0.8% |
| 459058 | 0.4% | 0.0% | 0.4% |
| 68389X | 0.5% | 0.0% | 0.4% |
| 023135 | 0.4% | 0.0% | 0.3% |
| 298785 | 0.6% | 0.0% | 0.5% |
| 38141G | 0.6% | 0.0% | 0.6% |
Where BIV and VFIFX 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 | BIV | VFIFX | Δ |
|---|---|---|---|
| Treasuries | 55.9% | 3.6% | +52.4pp |
| Information Technology | 0.0% | 26.1% | −26.1pp |
| Corporate — industrial & other | 20.2% | 1.1% | +19.0pp |
| Industrials | 0.0% | 10.5% | −10.5pp |
| Consumer Discretionary | 0.0% | 7.5% | −7.5pp |
| Health Care | 0.0% | 6.9% | −6.9pp |
| Unclassified | 0.2% | 6.3% | −6.1pp |
| Communication Services | 0.0% | 5.9% | −5.9pp |
Δ is BIV minus VFIFX, 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
0.1% of BIV by weight, held in no part of VFIFX.
93.0% of VFIFX by weight, held in no part of BIV.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| BIV | VFIFX | |
|---|---|---|
| Top 10 holdings | 62.1% | 19.3% |
| Positions held | 854 | 6 |
| Cost per $10,000 held, per year | $3 | $8 |
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 BIV and VFIFX overlap?
BIV and VFIFX overlap 4.1% by portfolio weight — largely distinct portfolios. They share 839 holdings. The figure comes from current issuer holdings files (BIV as of 2026-06-30, VFIFX as of 2026-03-31).
How is the overlap between BIV and VFIFX calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If BIV holds a stock at 6% and VFIFX 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 BIV and VFIFX?
That depends on your goals — we state facts, not advice. At 4.1% overlap, each fund still contributes meaningfully distinct exposure.
What does BIV own that VFIFX doesn't?
BIV holds 854 positions and VFIFX holds 6; 15 of BIV's positions don't appear in VFIFX at all, and they are 0.1% of BIV by weight.
You probably hold more than two funds
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Related comparisons
Sources: issuer holdings files, BIV as of 2026-06-30, VFIFX as of 2026-03-31. Weights are fractions of each fund. Diagnostics, not advice.