VBTLX vs VTIVX: 14% overlap
Vanguard Total Bond Market Index Admiral and Vanguard Target Retirement 2045 share 14.0% 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 — VTIVX 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 1.9. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
VBTLX and VTIVX hold 2,047 of the same securities. The ten contributing most to the overlap figure:
| Holding | in VBTLX | in VTIVX | Δ |
|---|---|---|---|
| UST-3-10Y | 21.3% | 2.7% | 18.5% |
| AGENCY-MBS | 20.3% | 2.6% | 17.7% |
| UST-0-3Y | 16.7% | 2.1% | 14.6% |
| UST-10Y+ | 10.2% | 1.3% | 8.9% |
| CASH | 1.1% | 1.9% | 0.8% |
| 46647P | 0.6% | 0.1% | 0.5% |
| 06051G | 0.5% | 0.1% | 0.4% |
| 459058 | 0.4% | 0.0% | 0.3% |
| 68389X | 0.3% | 0.0% | 0.3% |
| 023135 | 0.3% | 0.0% | 0.2% |
Where VBTLX and VTIVX 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 | VBTLX | VTIVX | Δ |
|---|---|---|---|
| Treasuries | 48.2% | 6.2% | +42.0pp |
| Information Technology | 0.0% | 23.8% | −23.8pp |
| MBS Pass-Through | 20.3% | 2.6% | +17.7pp |
| Corporate — industrial & other | 14.6% | 2.0% | +12.7pp |
| Industrials | 0.0% | 9.6% | −9.6pp |
| Unclassified | 0.7% | 8.0% | −7.4pp |
| Consumer Discretionary | 0.0% | 6.9% | −6.9pp |
| Health Care | 0.0% | 6.3% | −6.3pp |
Δ is VBTLX minus VTIVX, 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
0.0% of VBTLX by weight, held in no part of VTIVX.
85.1% of VTIVX by weight, held in no part of VBTLX.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| VBTLX | VTIVX | |
|---|---|---|
| Top 10 holdings | 71.7% | 21.4% |
| Positions held | 2,047 | 6 |
| Cost per $10,000 held, per year | $4 | $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 VBTLX and VTIVX overlap?
VBTLX and VTIVX overlap 14.0% by portfolio weight — largely distinct portfolios. They share 2,047 holdings. The figure comes from current issuer holdings files (VBTLX as of 2026-06-30, VTIVX as of 2026-03-31).
How is the overlap between VBTLX and VTIVX calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If VBTLX holds a stock at 6% and VTIVX 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 VBTLX and VTIVX?
That depends on your goals — we state facts, not advice. At 14.0% overlap, each fund still contributes meaningfully distinct exposure.
What does VBTLX own that VTIVX doesn't?
VBTLX holds 2,047 positions and VTIVX holds 6; 0 of VBTLX's positions don't appear in VTIVX at all, and they are 0.0% of VBTLX by weight.
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Related comparisons
Sources: issuer holdings files, VBTLX as of 2026-06-30, VTIVX as of 2026-03-31. Weights are fractions of each fund. Diagnostics, not advice.