ETF comparison
AGG vs VMBS
Both US Aggregate Bond.
iShares Core U.S. Aggregate Bond ETF · Vanguard Mortgage-Backed Securities Index Fund ETF Shares
Holdings overlap
575 positions appear in both funds. Buying equal dollars of AGG and VMBS would leave roughly 7.7% of each dollar exposed to the same underlying securities.
Unmatched is the part of a fund's weight the other fund doesn't match: names only it holds, plus any extra weight it puts in names both funds hold.
Side by side
Sub-score comparison
Tracking quality isn't part of the composite — see what we don't score for why.
Cost difference
Expense ratios are effectively identical (0.030% vs 0.030%).
Fee figure is the annual expense charged on $100,000. To see how the gap compounds over a multi-decade holding period, open the cost calculator pre-filled with AGG vs VMBS.
Top shared holdings
575 shared in total| # | Holding | In AGG | In VMBS | Overlap |
|---|---|---|---|---|
| 1 | Government National Mortgage Association | 0.20% | 0.28% | 0.20% |
| 2 | UMBS, TBA | 0.17% | 0.30% | 0.17% |
| 3 | UMBS, TBA | 0.15% | 0.17% | 0.15% |
| 4 | Fannie Mae | 0.21% | 0.14% | 0.14% |
| 5 | UMBS, TBA | 0.13% | 0.25% | 0.13% |
| 6 | Government National Mortgage Association | 0.13% | 0.15% | 0.13% |
| 7 | UMBS, TBA | 0.12% | 0.15% | 0.12% |
| 8 | Government National Mortgage Association | 0.11% | 0.24% | 0.11% |
| 9 | Government National Mortgage Association | 0.11% | 0.11% | 0.11% |
| 10 | Government National Mortgage Association | 0.11% | 0.12% | 0.11% |
| 11 | Government National Mortgage Association | 0.10% | 0.13% | 0.10% |
| 12 | Government National Mortgage Association | 0.10% | 0.30% | 0.10% |
Only in AGG
12,807 total- United States Treasury 0.41%
- United States Treasury 0.40%
- United States Treasury 0.40%
- United States Treasury 0.40%
- United States Treasury 0.39%
- United States Treasury 0.39%
- United States Treasury 0.39%
- United States Treasury 0.38%
- United States Treasury 0.38%
- United States Treasury 0.38%
Only in VMBS
4,287 total- Ginnie Mae II Pool 0.29%
- Ginnie Mae II Pool 0.27%
- Fannie Mae Pool 0.27%
- Freddie Mac Pool 0.26%
- Freddie Mac Pool 0.23%
- Freddie Mac Pool 0.22%
- Ginnie Mae II Pool 0.22%
- Ginnie Mae II Pool 0.22%
- Fannie Mae Pool 0.21%
- Ginnie Mae II Pool 0.20%
Related comparisons
More comparisons with AGG
- AGG vs IGLB · iShares 10+ Year Investment Grade Corporate Bond ETF 7.6%
- AGG vs JCPB · JPMorgan Core Plus Bond ETF 7.3%
- AGG vs SPLB · State Street SPDR Portfolio Long Term Corporate Bond Index ETF 7.1%
- AGG vs VCLT · Vanguard Long-Term Corporate Bond Index Fund ETF Shares 6.8%
- AGG vs IGIB · iShares 5-10 Year Investment Grade Corporate Bond ETF 6.6%
- AGG vs SCHI · Schwab 5-10 Year Corporate Bond ETF 6.6%
More comparisons with VMBS
- VMBS vs FBND · Fidelity Total Bond ETF 5.7%
- VMBS vs IUSB · iShares Core Universal USD Bond ETF 4.7%
- VMBS vs VCRB · Vanguard Core Bond ETF 4.3%
- VMBS vs AGGY · WisdomTree Yield Enhanced U.S. Aggregate Bond Fund 2.1%
- VMBS vs CGCP · Capital Group Core Plus Income ETF 1.6%
- VMBS vs JCPB · JPMorgan Core Plus Bond ETF 1.2%
Percentages are holdings overlap with the named fund.
Open AGG or VMBS at a brokerage
Both funds trade commission-free at major US brokerages.
Affiliate links — opening an account through these earns PlainIndex a one-time referral. Scoring is computed before any affiliate consideration; see our methodology and funding disclosure.
Holdings overlap is the sum of min(weight_a, weight_b) over positions
matched on ISIN (CUSIP fallback). Methodology: see
/methodology/.
Comparing two funds doesn't endorse swapping one for the other. Tax-lot history, account type, and personal goals matter — PlainIndex publishes data and methodology, not investment advice.