AGGUS aggregate bond
iShares Core U.S. Aggregate Bond ETF
13,390holdings
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 2026-08-27
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 12,270 companies outside the overlap; MBB has 1,488.
MBBbond
iShares MBS ETF
11,222holdings
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
1,114 companies held in both funds
AGG weight
MBB weight
| Shared company | AGG | MBB |
|---|---|---|
| BlackRock Funds III: BlackRock Cash Funds: Institutional; SL Agency Shares BISXX | 2.89% | 7.92% |
| Fannie Mae FNMA4437 | 0.21% | 0.30% |
| Government National Mortgage A 5.5 09/15/2037 G2SF | 0.20% | 1.10% |
| FNMA TBA 5.0% SEP 30YR FNCL | 0.17% | 0.73% |
| Government National Mortgage A 5 09/15/2037 G2SF | 0.16% | 0.55% |
| UMBS 15YR TBA(REG B) UM15 | 0.15% | 0.41% |
| FNMA TBA 4.5% SEP 30YR UM30 | 0.15% | 0.18% |
| G2SF 4.50 09/26 TBA G2SF | 0.15% | 0.49% |
| FNMA TBA 5.5% SEP 30YR FNCL | 0.14% | 0.98% |
| Freddie Mac FRSD8199 | 0.13% | 0.18% |
| Government National Mortgage Association | 0.13% | 0.35% |
| Fannie Mae FNMA4465 | 0.13% | 0.44% |
| Government National Mortgage Association | 0.13% | 0.23% |
| Fannie Mae | 0.12% | 0.51% |
| Fannie Mae or Freddie Mac 2 12/31/2049 UM15 | 0.12% | 0.31% |
| Fannie Mae | 0.12% | 0.21% |
| GNMA II POOL MB1070 | 0.11% | 0.42% |
| Government National Mortgage Association G2 | 0.11% | 0.50% |
| Government National Mortgage Association G2MA7534 | 0.11% | 0.29% |
| Government National Mortgage Association | 0.11% | 0.52% |
| Government National Mortgage Association | 0.10% | 0.18% |
| Government National Mortgage Association G2 | 0.10% | 0.16% |
| Fannie Mae FNMA4512 | 0.10% | 0.17% |
| Government National Mortgage Association | 0.10% | 0.54% |
| FNMA TBA 6.0% SEP 30YR UM30 | 0.10% | 0.34% |
AGG and MBB questions
Based on the holdings compared above
How much do AGG and MBB overlap?
AGG and MBB overlap by 19.2% by weight, across 1,114 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, Fannie Mae, Government National Mortgage A 5.5 09/15/2037, FNMA TBA 5.0% SEP 30YR, Government National Mortgage A 5 09/15/2037.
Can I hold both AGG and MBB?
Holding both means 19.2% 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.