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iShares MBS ETF MBB

Full chart Compare
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Price alert · MBB

All alert types
91.97 USD +0.44 (+0.48%)

At closeNov 4, 2026, 4:15 PM EST

91.96 -0.01 -0.01%

After hours · Nov 4, 4:15 PM ET

91.55 Day range 92.05
88.58 52-week range 96.97
YTD
-3.41%
1 year
-3.44%

iShares MBS ETF

Issuer
IShares
Asset class
Fixed Income
Expense ratio
0.04%
Assets under management
$35.75B
NAV
91.59
Holdings
10,825
Inception
2007-03-13
Top 10 weight
11.18%

Top holdings

  1. BLACKROCK CASH CL INST SL AGENCY 5.45%
  2. FHLMC 30YR UMBS SUPER 2.00% 05/01/2051 1.05%
  3. UMBS 30YR TBA(REG A) 5.50% 11/12/2026 0.76%
  4. GNMA2 30YR TBA 6.00% 11/19/2026 0.70%
  5. GNMA2 30YR 5.00% 11/20/2054 0.59%
  6. GNMA2 30YR 2.00% 10/20/2051 0.54%
  7. GNMA2 30YR 2.00% 12/20/2051 0.53%
  8. FNMA 30YR UMBS 2.00% 12/01/2051 0.53%
  9. GNMA2 30YR 2.50% 07/20/2051 0.52%
  10. FHLMC 30YR UMBS SUPER 2.00% 04/01/2051 0.51%
  11. GNMA2 30YR TBA(REG C) 5.50% 11/19/2026 0.49%
  12. FNMA 30YR UMBS 2.00% 11/01/2051 0.45%
  13. GNMA2 30YR 5.00% 04/20/2056 0.43%
  14. GNMA2 30YR 5.50% 09/20/2053 0.40%
  15. GNMA2 30YR 5.50% 09/20/2055 0.40%
  16. UMBS 30YR TBA(REG A) 5.00% 11/12/2026 0.37%
  17. GNMA2 30YR 2.50% 05/20/2051 0.35%
  18. GNMA2 30YR TBA(REG C) 4.50% 11/19/2026 0.34%
  19. FNMA 30YR UMBS SUPER 2.00% 04/01/2052 0.33%
  20. GNMA2 30YR 2.00% 01/20/2052 0.33%
  21. GNMA2 30YR 5.00% 05/20/2056 0.32%
  22. UMBS 15YR TBA(REG B) 4.00% 11/17/2026 0.32%
  23. FNMA 30YR UMBS 2.00% 10/01/2051 0.32%
  24. GNMA2 30YR TBA(REG C) 5.00% 11/19/2026 0.30%
  25. GNMA2 30YR 2.50% 08/20/2051 0.30%

Sector weights

  • Federal National Mortgage Association 42.64%
  • Federal Home Loan Mortgage Corporation 30.24%
  • Government National Mortgage Association 24.01%
  • Uniform MBS 2.67%
  • Cash and/or Derivatives 0.44%

Country weights

  • United States 94.69%
  • Other 5.32%

Updated 2026-11-04

Held by funds

18 US ETFs and mutual funds hold MBB · largest positions

Funds holding MBB, by value held
FundValue heldWeight in fund
APCB $119.32M11.97%
FTRB $95.59M13.09%
BDBT $74.23M14.92%
BAMPX $46.40M5.94%
BACPX $44.00M9.93%
WTBN $26.90M25.62%
MAMB $25.03M12.51%
BNDC $22.97M10.44%
DUKZ $8.92M15.00%
FLTN $4.81M27.80%
AGGP $2.45M9.27%
FOPC $2.21M6.99%
ADFI $1.98M14.77%
LCR $826.21K1.27%
MEM $258.84K0.50%
MEMS $201.68K1.00%
KDRN $170.89K15.19%
QMN $110.66K1.78%