iShares Core Total USD Bond Market ETF (IUSB) is an ETF managed by BlackRock / iShares. Its largest position is BLACKROCK LIQUIDITY TEMPCASH (TMCXX), representing 2.88% of fund assets.
iShares Core Total USD Bond Market ETF Portfolio Holdings
Source: SEC Form N-PORT institutional portfolio disclosures
- Ticker:
- IUSB
- Type:
- ETF
- Manager:
- BlackRock / iShares
- Total Assets:
- —
- Report Date:
- Apr 30, 2026
- Filing Date:
- Jun 26, 2026
| Holding | Weight | Market Value | Shares |
|---|---|---|---|
|
-
BLACKROCK LIQUIDITY TEMPCASH
|
2.88% | $1,052,938,301.58 | 1,052,626,716 |
|
-
BLACKROCK CASH FUNDS TREASURY SL AGENCY SHARES
|
0.93% | $341,150,319.30 | 341,150,319 |
|
-
UMBS P#MA4018 2% 05/01/50
|
0.32% | $115,853,617.37 | 142,723,385 |
|
-
UMBS, TBA
|
0.22% | $81,182,703.24 | 82,411,438 |
|
-
G2SF 30 YR TBA 5% MAY 26
|
0.21% | $76,706,202.06 | 77,384,000 |
|
-
GOVERNMENT NATIONAL MORTGAGE ASSOCIATION
|
0.21% | $75,744,713.23 | 91,921,152 |
|
-
FEDERAL NATIONAL MORTGAGE ASSOCIATION FANNIE MAE
|
0.20% | $72,855,615.50 | 72,495,000 |
|
-
UNIFORM MORTGAGE-BACKED SECURITIES
|
0.19% | $70,342,935.58 | 76,722,903 |
|
-
FANNIE MAE
|
0.19% | $69,926,003.05 | 87,148,892 |
|
-
GOVERNMENT NATIONAL MORTGAGE ASSOCIATION
|
0.18% | $65,230,188.82 | 64,775,000 |
|
-
UNIFORM MORTGAGE-BACKED SECURITIES
|
0.14% | $52,393,025.56 | 65,500,000 |
|
-
FEDERAL HOME LOAN MORTGAGE CORP
|
0.13% | $48,231,178.29 | 48,687,918 |
|
-
UMBS, TBA
|
0.11% | $41,854,133.73 | 41,000,000 |
|
-
GOVERNMENT NATIONAL MORTGAGE ASSOCIATION
|
0.11% | $41,813,911.05 | 48,795,403 |
|
-
UMBS, TBA
|
0.11% | $41,425,932.01 | 43,071,000 |
|
-
FANNIE MAE
|
0.11% | $38,490,678.59 | 43,810,069 |
|
-
FEDERAL HOME LOAN MORTGAGE CORP
|
0.10% | $38,241,527.61 | 47,477,302 |
|
-
FEDERAL HOME LOAN MORTGAGE CORP
|
0.10% | $37,652,149.53 | 46,512,683 |
|
-
FANNIE MAE
|
0.10% | $36,721,273.99 | 45,434,362 |
|
-
GNMA
|
0.10% | $36,168,483.10 | 35,642,864 |
|
-
GOVERNMENT NATIONAL MORTGAGE ASSOCIATION
|
0.10% | $36,115,777.50 | 37,456,000 |
|
-
FEDERAL NATIONAL MORTGAGE ASSOCIATION
|
0.10% | $35,720,670.71 | 42,390,594 |
|
-
FEDERAL HOME LOAN MORTGAGE CORP
|
0.10% | $35,663,048.82 | 44,266,318 |
|
-
FEDERAL NATIONAL MORTGAGE ASSOCIATION
|
0.10% | $34,957,909.63 | 33,727,975 |
|
-
GNMAII 30YR TBA 3.5% MAY 26
|
0.09% | $34,581,454.86 | 38,262,750 |
|
-
GOVERNMENT NATIONAL MORTGAGE ASSOCIATION
|
0.09% | $34,120,832.18 | 34,336,050 |
|
-
GOVERNMENT NATIONAL MORTGAGE ASSOCIATION
|
0.09% | $33,499,335.38 | 40,653,630 |
|
-
FEDERAL HOME LOAN MORTGAGE CORP
|
0.09% | $33,475,457.65 | 32,993,305 |
|
-
FEDERAL NATIONAL MORTGAGE ASSOCIATION
|
0.09% | $33,456,890.01 | 41,424,786 |
|
-
FNMA
|
0.09% | $33,012,262.88 | 32,129,737 |
|
-
FNMA
|
0.09% | $32,547,877.57 | 38,561,474 |
|
-
GOVERNMENT NATIONAL MORTGAGE ASSOCIATION
|
0.09% | $32,098,660.18 | 34,407,000 |
|
-
GOVERNMENT NATIONAL MORTGAGE ASSOCIATION
|
0.09% | $31,438,288.83 | 31,163,566 |
|
-
FANNIE MAE
|
0.08% | $29,990,871.36 | 37,235,659 |
|
-
FEDERAL HOME LOAN MORTGAGE CORP
|
0.08% | $29,957,032.92 | 35,426,885 |
|
-
GOVERNMENT NATIONAL MORTGAGE ASSOCIATION
|
0.08% | $29,697,820.85 | 34,655,776 |
|
-
FANNIE MAE
|
0.08% | $29,672,821.04 | 33,575,805 |
|
-
FEDERAL HOME LOAN MORTGAGE CORP
|
0.08% | $29,401,386.06 | 36,329,767 |
|
-
FEDERAL NATIONAL MORTGAGE ASSOCIATION
|
0.08% | $29,133,753.18 | 34,570,558 |
|
-
GOVERNMENT NATIONAL MORTGAGE A
|
0.08% | $28,869,935.40 | 32,398,683 |
|
-
FEDERAL NATIONAL MORTGAGE ASSOCIATION
|
0.08% | $28,767,303.73 | 35,701,045 |
|
-
UNIFORM MORTGAGE-BACKED SECURITIES
|
0.08% | $28,277,936.39 | 31,070,000 |
|
-
GNMA
|
0.08% | $27,998,650.47 | 33,978,189 |
|
-
GNMA
|
0.08% | $27,432,001.85 | 32,012,207 |
|
-
FANNIE MAE
|
0.07% | $26,401,033.55 | 31,330,753 |
|
-
GOVERNMENT NATIONAL MORTGAGE ASSOCIATION
|
0.07% | $26,092,698.60 | 30,449,286 |
|
-
FEDERAL HOME LOAN MORTGAGE CORP
|
0.07% | $25,718,625.93 | 30,302,678 |
|
-
UMBS, TBA
|
0.07% | $25,657,821.44 | 26,337,000 |
|
-
GNMA
|
0.07% | $25,285,756.06 | 29,507,612 |
|
-
FANNIE MAE
|
0.07% | $24,713,989.07 | 29,315,308 |
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