BISBX Mutual Fund

NAV$9.46

AUM$5.3B

TER0.02%

Holdings1,963

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BISBX Mutual Fund

NAV$9.46

iShares US Securitized Bond Index Fund

AUM$5.3B

TER0.02%

Holdings1,963

See how much of BISBX you already own

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Overview Performance Chart Dividends Top Holdings All Holdings Sectors Geography Similar Compare Overlap

Showing top 50 of 1,888 holdings · as of Jan 31, 2026

BISBX holdings, by weight
#	Ticker	Name	Weight	Cumulative	Shares	Mkt value	Sector	Industry
1	Debt	Blackrock Cash Funds: Treasury, Sl Agency SharesFinancials · Capital Markets	10.02%	10.0%	584,103,159	$584.40M	Financials	Capital Markets
2	—	Fannie Mae Pool Umbs P#Ma4437 2.00000000Financials · Thrifts	1.08%	11.1%	-	$62.80M	Financials	Thrifts
Sector and industry · Pro
3	Debt	Fannie Mae	0.88%	12.0%	-	$51.12M
4	—	Fannie Mae Pool Umbs P#Ma4465 2.00000000	0.84%	12.8%	-	$49.21M
5	—	Fhlmc 30Yr Umbs Super 2% Apr 01, 2051	0.81%	13.6%	-	$47.33M
6	Debt	Fannie Mae Or Freddie Mac	0.78%	14.4%	-	$45.69M
7	Debt	Government National Mortgage A	0.64%	15.1%	-	$37.57M
8	—	Fannie Mae Or Freddie Mac 02/25/2054	0.63%	15.7%	-	$36.61M
9	—	Gnma2 30Yr Tba(Reg C) 5% Nov 20, 2024	0.62%	16.3%	-	$35.93M
10	—	Fnma Tba 30 Yr 3.5 Single Family Mortgage 02/15/2056	0.59%	16.9%	-	$34.52M
11	—	Fnma Tba 30 Yr 5.5 Single Family Mortgage	0.54%	17.4%	-	$31.76M
12	Debt	Government National Mortgage A	0.53%	18.0%	-	$30.65M
13	—	Umbs 30Yr Tba(Reg A) 4% Feb 11, 2021	0.52%	18.5%	-	$30.13M
14	Debt	-	0.48%	19.0%	-	$28.11M
15	Debt	Umbs 15Yr Tba(Reg B)	0.48%	19.4%	-	$27.97M
16	—	Freddie Mac Pool 2052-03-01	0.47%	19.9%	-	$27.69M
17	Debt	Umbs P#Cb5102	0.46%	20.4%	-	$27.09M
18	—	Gnma2 30Yr 2.5% Aug 20, 2051	0.45%	20.8%	-	$26.49M
19	—	Gnma2 30Yr 5% Dec 20, 2054	0.45%	21.3%	-	$26.41M
20	—	Freddie Mac Pool Umbs P#Ra6503 2.00000000	0.44%	21.7%	-	$25.48M
21	—	Government National Mortgage Association 2053-09-20	0.44%	22.2%	-	$25.78M
22	—	Freddie Macfreddie Mac Pool 02/01/2052	0.42%	22.6%	-	$24.72M
23	—	Gnma2 30Yr 2% Dec 20, 2051	0.41%	23.0%	-	$23.61M
24	—	Fannie Mae Pool Umbs P#Ma4582 2.00000000	0.41%	23.4%	-	$24.15M
25	—	Umbs Tba 30Yr 2.5% February Delivery	0.41%	23.8%	-	$23.66M
26	—	Umbs 30Yr Tba(Reg A) 4.5% Feb 11, 2021	0.41%	24.2%	-	$23.78M
27	Debt	Gnma Ii P#Ma7472	0.39%	24.6%	-	$22.81M
28	Debt	Fannie Mae Pool	0.39%	25.0%	-	$22.97M
29	—	Gnma Ii Mortpass 2% 20/Feb/2051 Sf Pn# Ma7192	0.39%	25.4%	-	$22.57M
30	Debt	-	0.38%	25.8%	-	$21.90M
31	—	Fannie Mae Pool Umbs P#Bv4170 2.50000000	0.38%	26.1%	-	$22.44M
32	—	Gnma Ii Mortpass 2.5% 20/Feb/2051 Sf Pn# Ma7193	0.37%	26.5%	-	$21.31M
33	Debt	-	0.36%	26.9%	-	$21.21M
34	Debt	Federal National Mortgage Association Or Federal Home Loan Mortgage Corp	0.36%	27.2%	-	$20.97M
35	—	Gnma2 30Yr 5.5% Oct 20, 2054	0.35%	27.6%	-	$20.23M
36	—	Freddie Mac Pool 2051-07-01	0.35%	27.9%	-	$20.27M
37	—	Freddie Mac Pool Umbs P#Sd8204 2.00000000	0.35%	28.3%	-	$20.23M
38	Debt	Freddie Mac Pool	0.34%	28.6%	-	$19.62M
39	—	Fnma 30Yr Umbs Super 2.5% Sep 01, 2050	0.34%	29.0%	-	$19.62M
40	—	Fannie Mae Pool 2.5 2052-01-01	0.34%	29.3%	-	$20.10M
41	Debt	Fnma 30Yr Umbs Super	0.33%	29.6%	-	$19.28M
42	Debt	Umbs Pma4493	0.33%	30.0%	-	$19.12M
43	—	FNMA Tba 30Yr Tba 3% Feb19 To Be Announced 3.00000000	0.33%	30.3%	-	$19.45M
44	—	Government National Mortgage Association G2 Ma7936 2052-03-20	0.32%	30.6%	-	$18.49M
45	Debt	Freddie Mac	0.32%	30.9%	-	$18.50M
46	—	Fannie Mae 2052-07-01	0.30%	31.2%	-	$17.55M
47	—	Fannie Mae Pool Umbs P#Ma4600 3.50000000	0.30%	31.5%	-	$17.32M
48	—	Fnma 30Yr 3.56/01/2046	0.30%	31.8%	-	$17.23M
49	—	Fnma 30Yr Umbs Super 5.5% Feb 01, 2054	0.29%	32.1%	-	$17.14M
50	—	Gnma2 30Yr 6% Aug 20, 2054	0.29%	32.4%	-	$16.93M
More holdings · Pro

Not reported for this fund: share changes.

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BISBX Mutual Fund All Holdings

BISBX holdings total 1963 positions. The top 10 holdings account for 16.9% of the fund, led by Blackrock Cash Funds: Treasury, Sl Agency Shares at 10.0%, Fannie Mae Pool Umbs P#Ma4437 2.00000000 at 1.1%, Fannie Mae 2.5 01/01/2052 at 0.9%.

BISBX portfolio concentration is well-diversified, with the top 10 representing 16.9% of total assets. The largest sector exposure is Financials at 92.5%.

BISBX sectors provide a detailed breakdown. BISBX overlap shows how holdings compare to other funds in your portfolio.