AGG vs BSV: 58% overlap
iShares Core U.S. Aggregate Bond ETF and Vanguard Short-Term Bond ETF share 58.1% of their portfolios by weight — computed as Σ min(wA, wB) over every holding both funds own.
Different holding dates. These holdings were published 27 days apart — BSV as of 2026-06-30, the rest through 2026-07-27. 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 1.4. Two funds that shared nothing would score 2.0; two identical funds score 1.0.
Top shared holdings
AGG and BSV hold 943 of the same securities. The ten contributing most to the overlap figure:
| Holding | in AGG | in BSV | Δ |
|---|---|---|---|
| UST-3-10Y | 21.0% | 28.5% | 7.5% |
| UST-0-3Y | 16.1% | 40.9% | 24.8% |
| CASH | 2.9% | 0.7% | 2.2% |
| 46647P | 0.5% | 0.7% | 0.2% |
| 06051G | 0.5% | 0.6% | 0.0% |
| 38141G | 0.3% | 0.4% | 0.1% |
| 459058 | 0.3% | 0.6% | 0.4% |
| 95000U | 0.3% | 0.4% | 0.1% |
| 404280 | 0.3% | 0.4% | 0.1% |
| 61747Y | 0.3% | 0.3% | 0.0% |
Where AGG and BSV 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 | AGG | BSV | Δ |
|---|---|---|---|
| MBS Pass-Through | 24.1% | 0.2% | +24.0pp |
| Treasuries | 46.5% | 69.4% | −22.9pp |
| Cash & Other | -2.3% | 0.0% | −2.3pp |
| Cash and/or Derivatives | 2.9% | 0.7% | +2.2pp |
| Financials | 8.0% | 10.0% | −2.0pp |
| Corporate — industrial & other | 14.3% | 12.6% | +1.6pp |
| Supranational | 0.9% | 2.5% | −1.6pp |
| Agency | 0.4% | 1.2% | −0.8pp |
Δ is AGG minus BSV, 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
13.2% of AGG by weight, held in no part of BSV.
0.2% of BSV by weight, held in no part of AGG.
A large count with a small weight is the usual shape: the positions one fund adds are typically its smallest ones.
Concentration and cost
| AGG | BSV | |
|---|---|---|
| Top 10 holdings | 75.5% | 73.8% |
| Positions held | 1,865 | 960 |
| Cost per $10,000 held, per year | $3 | $3 |
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 AGG and BSV overlap?
AGG and BSV overlap 58.1% by portfolio weight — substantial duplication if you hold both. They share 943 holdings. The figure comes from current issuer holdings files (AGG as of 2026-07-27, BSV as of 2026-06-30).
How is the overlap between AGG and BSV calculated?
As the sum of the smaller weight in each fund, over every holding both funds own: Σ min(wA, wB). If AGG holds a stock at 6% and BSV 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 AGG and BSV?
That depends on your goals — we state facts, not advice. At 58.1% overlap, each fund still contributes meaningfully distinct exposure.
What does AGG own that BSV doesn't?
AGG holds 1,865 positions and BSV holds 960; 921 of AGG's positions don't appear in BSV at all, and they are 13.2% of AGG by weight.
You probably hold more than two funds
This page compares AGG and BSV. Paste your whole portfolio — brokerage, 401(k), IRA — and see the overlap across every fund at once, plus what you actually own underneath them and your own Effective Funds number. Free, no account, nothing stored.
X-ray my portfolio — free →Watch AGG vs BSV
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.
Related comparisons
Sources: issuer holdings files, AGG as of 2026-07-27, BSV as of 2026-06-30. Weights are fractions of each fund. Diagnostics, not advice.