MBB Holdings and Portfolio Weights

MBB ETF holdings

Weights reproduce the dated portfolio and may not sum to exactly 100% because of cash, derivatives, rounding, liabilities, or other positions. Provenance stays internal.

Snapshot field	Reported value
Fund	iShares MBS ETF
Report date	2026-02-28
Reported holdings	11,153
SEC series ID	S000013702

Positions 1–100 of 11,153

Ticker	Issuer	Weight	Value (USD)	Balance
BLACKROCK CASH FUNDS	BLACKROCK CASH FUNDS	5.900546%	2,349,748,882.32	2,348,574,595.03 NS
Freddie Mac	Freddie Mac	1.073738%	427,589,929.06	511,173,405.7 PA
Government National Mortgage Association	Government National Mortgage Association	1.003243%	399,517,163.25	394,483,000 PA
UMBS, TBA	UMBS, TBA	0.57201%	227,789,172.2	226,772,000 PA
Government National Mortgage Association	Government National Mortgage Association	0.555679%	221,285,634.59	261,137,813.66 PA
Government National Mortgage Association	Government National Mortgage Association	0.54616%	217,494,998.47	256,664,507.34 PA
Fannie Mae	Fannie Mae	0.533553%	212,474,536.6	255,146,803.61 PA
Government National Mortgage Association	Government National Mortgage Association	0.52708%	209,896,727.56	209,187,000 PA
Freddie Mac	Freddie Mac	0.513586%	204,523,050.63	244,776,593.2 PA
UMBS, TBA	UMBS, TBA	0.496576%	197,749,445.88	194,629,000 PA
Government National Mortgage Association	Government National Mortgage Association	0.466916%	185,938,026.36	210,649,455.07 PA
Government National Mortgage Association	Government National Mortgage Association	0.454632%	181,046,291.07	177,486,000 PA
Fannie Mae	Fannie Mae	0.452935%	180,370,505.38	216,504,307.95 PA
Fannie Mae	Fannie Mae	0.447818%	178,332,612.01	212,806,353.95 PA
Government National Mortgage Association	Government National Mortgage Association	0.423011%	168,453,696.8	167,611,847.86 PA
Government National Mortgage Association	Government National Mortgage Association	0.37275%	148,438,446.26	175,178,524.9 PA
Government National Mortgage Association	Government National Mortgage Association	0.363259%	144,659,079.64	163,884,477.5 PA
UMBS, TBA	UMBS, TBA	0.351616%	140,022,705.46	150,295,791 PA
Freddie Mac	Freddie Mac	0.350375%	139,528,303.51	167,480,732.2 PA
Fannie Mae	Fannie Mae	0.334498%	133,205,700.36	159,356,147.79 PA
Fannie Mae	Fannie Mae	0.334224%	133,096,404.12	159,358,647 PA
Government National Mortgage Association	Government National Mortgage Association	0.328253%	130,718,959.53	128,069,837.5 PA
Fannie Mae	Fannie Mae	0.320415%	127,597,398.48	152,966,535.93 PA
Government National Mortgage Association	Government National Mortgage Association	0.315726%	125,730,376.64	148,373,642.63 PA
Government National Mortgage Association	Government National Mortgage Association	0.310269%	123,557,203.52	139,978,131.97 PA
Fannie Mae	Fannie Mae	0.302742%	120,559,723.67	144,287,885.14 PA
Fannie Mae	Fannie Mae	0.290336%	115,619,322.46	138,247,369.95 PA
Government National Mortgage Association	Government National Mortgage Association	0.290076%	115,515,880.49	130,866,462.94 PA
Government National Mortgage Association	Government National Mortgage Association	0.286412%	114,056,581.14	134,569,387.1 PA
Government National Mortgage Association	Government National Mortgage Association	0.282218%	112,386,442.84	127,322,761.27 PA
Government National Mortgage Association	Government National Mortgage Association	0.273906%	109,076,526.13	107,349,976.73 PA
Freddie Mac	Freddie Mac	0.25843%	102,913,588.13	101,057,674.05 PA
UMBS, TBA	UMBS, TBA	0.254409%	101,312,358.87	98,775,000 PA
Government National Mortgage Association	Government National Mortgage Association	0.252892%	100,708,131.64	98,627,489.09 PA
Freddie Mac	Freddie Mac	0.243448%	96,947,222.98	116,417,592.7 PA
Fannie Mae	Fannie Mae	0.233733%	93,078,582.6	101,344,892.24 PA
Government National Mortgage Association	Government National Mortgage Association	0.233585%	93,019,370.83	89,335,472.54 PA
Government National Mortgage Association	Government National Mortgage Association	0.232934%	92,760,491.48	105,087,173.89 PA
Government National Mortgage Association	Government National Mortgage Association	0.229682%	91,465,086.29	103,620,926.62 PA
Freddie Mac	Freddie Mac	0.227743%	90,692,946.45	108,497,448.23 PA
Freddie Mac	Freddie Mac	0.226811%	90,321,930.34	88,727,119.81 PA
Fannie Mae	Fannie Mae	0.220115%	87,655,418.5	105,259,671.15 PA
Fannie Mae	Fannie Mae	0.21875%	87,111,954.59	84,644,495.6 PA
Freddie Mac	Freddie Mac	0.218698%	87,091,149.17	99,444,363.71 PA
Fannie Mae	Fannie Mae	0.215071%	85,646,847.71	94,457,156.7 PA
Government National Mortgage Association	Government National Mortgage Association	0.212941%	84,798,764.06	82,818,664.21 PA
Fannie Mae	Fannie Mae	0.206376%	82,184,209.52	80,606,374.4 PA
Government National Mortgage Association	Government National Mortgage Association	0.202417%	80,607,537.41	80,229,360.27 PA
Freddie Mac	Freddie Mac	0.200389%	79,799,967.76	78,678,813.55 PA
Freddie Mac	Freddie Mac	0.195341%	77,789,632.23	89,333,741.16 PA
Fannie Mae	Fannie Mae	0.192465%	76,644,320.03	92,114,475.48 PA
Government National Mortgage Association	Government National Mortgage Association	0.191916%	76,425,905.14	90,193,461.76 PA
Government National Mortgage Association	Government National Mortgage Association	0.187511%	74,671,722.15	84,594,638.57 PA
Freddie Mac	Freddie Mac	0.181834%	72,410,808.38	86,582,446.61 PA
UMBS, TBA	UMBS, TBA	0.179045%	71,300,474.9	68,650,000 PA
Fannie Mae	Fannie Mae	0.178557%	71,106,133.05	81,573,670.53 PA
Freddie Mac	Freddie Mac	0.176702%	70,367,410.73	68,892,067.13 PA
Fannie Mae	Fannie Mae	0.176325%	70,217,042.99	80,183,017.5 PA
Freddie Mac	Freddie Mac	0.17597%	70,075,805.38	68,687,832.41 PA
Fannie Mae	Fannie Mae	0.174421%	69,458,821.71	79,658,210.37 PA
Government National Mortgage Association	Government National Mortgage Association	0.17389%	69,247,551.17	68,920,334.65 PA
Fannie Mae	Fannie Mae	0.173034%	68,906,492.05	79,050,220.27 PA
Fannie Mae	Fannie Mae	0.172228%	68,585,657.16	86,371,116.22 PA
Fannie Mae	Fannie Mae	0.168017%	66,908,669.57	73,179,906.55 PA
Freddie Mac	Freddie Mac	0.164003%	65,310,264.59	64,041,491.22 PA
Fannie Mae	Fannie Mae	0.161157%	64,177,050.8	63,752,679.18 PA
Government National Mortgage Association	Government National Mortgage Association	0.161009%	64,118,069.71	75,668,461.6 PA
Government National Mortgage Association	Government National Mortgage Association	0.160757%	64,017,667.35	63,491,039.65 PA
Freddie Mac	Freddie Mac	0.160153%	63,776,872.99	60,537,411.95 PA
Freddie Mac	Freddie Mac	0.158605%	63,160,750.97	75,686,808.84 PA
Freddie Mac	Freddie Mac	0.156766%	62,428,389.24	59,865,332.84 PA
Fannie Mae	Fannie Mae	0.156096%	62,161,338.39	68,089,203.51 PA
Fannie Mae	Fannie Mae	0.1547%	61,605,512.66	73,823,135.24 PA
Government National Mortgage Association	Government National Mortgage Association	0.153209%	61,011,870.91	69,120,435.51 PA
Fannie Mae	Fannie Mae	0.15277%	60,836,981.33	73,024,514.25 PA
Fannie Mae	Fannie Mae	0.152645%	60,786,983.52	58,758,753 PA
Fannie Mae	Fannie Mae	0.152402%	60,690,207.97	72,257,804.55 PA
Government National Mortgage Association	Government National Mortgage Association	0.152225%	60,619,836.26	59,665,929.6 PA
Fannie Mae	Fannie Mae	0.152115%	60,576,030.13	58,183,808.1 PA
Government National Mortgage Association	Government National Mortgage Association	0.151921%	60,498,921.46	68,482,951.58 PA
Government National Mortgage Association	Government National Mortgage Association	0.149882%	59,686,772.54	60,298,876.08 PA
Government National Mortgage Association	Government National Mortgage Association	0.149646%	59,592,815.67	59,031,505.16 PA
Fannie Mae	Fannie Mae	0.149099%	59,375,173.71	57,924,912.88 PA
Freddie Mac	Freddie Mac	0.146626%	58,390,251.06	66,701,279.13 PA
Fannie Mae	Fannie Mae	0.146442%	58,317,101.96	55,992,518.25 PA
Fannie Mae	Fannie Mae	0.144246%	57,442,519.81	57,146,925.62 PA
Fannie Mae	Fannie Mae	0.144007%	57,347,153.3	55,493,154.75 PA
Government National Mortgage Association	Government National Mortgage Association	0.143652%	57,206,017.94	67,508,469.23 PA
Government National Mortgage Association	Government National Mortgage Association	0.143313%	57,070,890.13	54,887,460.37 PA
Fannie Mae	Fannie Mae	0.142369%	56,695,126.76	56,345,451.4 PA
Freddie Mac	Freddie Mac	0.142011%	56,552,484.57	71,076,830.99 PA
Freddie Mac	Freddie Mac	0.140395%	55,908,875.89	58,550,969.05 PA
Fannie Mae	Fannie Mae	0.140069%	55,779,103.8	63,702,537.53 PA
Fannie Mae	Fannie Mae	0.138644%	55,211,688.19	65,735,075.02 PA
Fannie Mae	Fannie Mae	0.137446%	54,734,363.41	62,769,460.74 PA
Government National Mortgage Association	Government National Mortgage Association	0.136789%	54,472,902.13	58,613,414.7 PA
Freddie Mac	Freddie Mac	0.135778%	54,070,230.81	55,572,513.11 PA
Government National Mortgage Association	Government National Mortgage Association	0.135178%	53,831,496.87	53,495,502.85 PA
Fannie Mae	Fannie Mae	0.135098%	53,799,438.43	61,021,209.48 PA
Freddie Mac	Freddie Mac	0.134966%	53,746,831.5	52,411,974 PA