AGGUS aggregate bond
iShares Core U.S. Aggregate Bond ETF
13,418holdings
0.03%annual fee
USmarket
ValuationNot available for this holdings date
AGG holdings and fund profile
ETF comparisons / AGG vs MBB
US aggregate bond comparison · Holdings dated 2026-10-12
AGG vs MBB
iShares Core U.S. Aggregate Bond ETF compared with iShares MBS ETF
Most company exposure is different between these funds.AGG has 12,315 companies outside the overlap; MBB has 1,461.
Do AGG and MBB overlap?
AGG and MBB overlap by 18.6% by weight, across 1,098 shared companies.
MBBbond
iShares MBS ETF
10,858holdings
0.04%annual fee
USmarket
ValuationNot available for this holdings date
MBB holdings and fund profile
Price development
Both lines rebased to 0% over their shared dates
Largest shared positions
1,098 companies held in both funds
AGG weight
MBB weight
| Shared company | AGG | MBB |
|---|---|---|
| BlackRock Funds III: BlackRock Cash Funds: Institutional; SL Agency Shares BISXX | 3.05% | 4.90% |
| TBA GNMA2 30YR 5.5% OCT 26 G2SF | 0.21% | 0.60% |
| Fannie Mae FNMA4437 | 0.20% | 0.32% |
| Fannie Mae or Freddie Mac 5.5 11/15/2032 FNCL | 0.20% | 0.62% |
| FNMA TBA 6.0% NOV 30YR FNCL | 0.18% | 0.27% |
| FNMA TBA 5.0% NOV 30YR FNCL | 0.16% | 0.37% |
| Fannie Mae or Freddie Mac 4 11/15/2034 UM15 | 0.14% | 0.27% |
| Government National Mortgage A 4.5 10/15/2033 G2SF | 0.13% | 0.22% |
| Government National Mortgage Association | 0.12% | 0.37% |
| Government National Mortgage Association | 0.12% | 0.26% |
| Fannie Mae FNMA4465 | 0.12% | 0.46% |
| Fannie Mae | 0.12% | 0.54% |
| FNMA TBA 4.5% NOV 30YR UM30 | 0.12% | 0.12% |
| FNMA TBA 2.0% NOV 15YR UM15 | 0.11% | 0.21% |
| Fannie Mae | 0.11% | 0.22% |
| GNMA II POOL MB1070 | 0.11% | 0.45% |
| Government National Mortgage Association G2 | 0.11% | 0.53% |
| Government National Mortgage Association | 0.11% | 0.61% |
| Government National Mortgage Association G2MA7534 | 0.10% | 0.31% |
| UMBS 30YR 2.0 MBS-TBA 11/26 UM30 | 0.10% | 0.27% |
| Government National Mortgage Association | 0.10% | 0.54% |
| Government National Mortgage Association | 0.10% | 0.19% |
| Government National Mortgage Association G2 | 0.10% | 0.17% |
| UMBS 30YR 2.5 MBS-TBA 11/26 UM30 | 0.09% | 0.09% |
| Government National Mortgage Association | 0.09% | 0.20% |
AGG and MBB questions
Based on the holdings compared above
How much do AGG and MBB overlap?
AGG and MBB overlap by 18.6% by weight, across 1,098 shared companies.
Which companies do AGG and MBB both hold?
The largest companies held in both funds are BlackRock Funds III: BlackRock Cash Funds: Institutional; SL Agency Shares, TBA GNMA2 30YR 5.5% OCT 26, Fannie Mae, Fannie Mae or Freddie Mac 5.5 11/15/2032, FNMA TBA 6.0% NOV 30YR.
Can I hold both AGG and MBB?
Holding both means 18.6% of that part of your portfolio is the same companies counted twice. That can suit you or not depending on your goals; this tool reports the overlap rather than giving advice.
Is AGG or MBB cheaper?
AGG has a 0.03% expense ratio and MBB has 0.04%.
Compare your own portfolio
Open the analyzerSee the companies and duplicated exposure across every fund you hold.