iShares 신탁 - iShares MBS ETF
US ˙ NasdaqGM ˙ US4642885887

SecurityMBB / iShares Trust - iShares MBS ETF
InstitutionAsset Management One Co., Ltd.
Latest Disclosed Ownership1,154,212 shares
Latest Disclosed Value $ 109,592,429
Asset Management One Co., Ltd. reports 13.92% increase in ownership of MBB / iShares Trust - iShares MBS ETF

On May 8, 2026 - Asset Management One Co., Ltd. filed a 13F-HR form disclosing ownership of 1,154,212 shares of iShares Trust - iShares MBS ETF (US:MBB) valued at $109,592,429 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 27, 2026 disclosing 1,013,156 shares of iShares Trust - iShares MBS ETF. This represents a change in shares of 13.92% during the quarter. The current value of the position is $108,738,313 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-08 2026-03-31 13F ISHARES TR MBS ETF 464288588 1,154,212 141,056 13.92 109,592 13.33 0.3232
2026-01-27 2025-12-31 13F ISHARES TR MBS ETF 464288588 1,013,156 -35,118 -3.35 96,706 -3.05 0.2689
2025-10-22 2025-09-30 13F ISHARES TR MBS ETF 464288588 1,048,274 85,476 8.88 99,743 10.34 0.2890
2025-07-31 2025-06-30 13F ISHARES TR MBS ETF 464288588 962,798 -35,575 -3.56 90,397 -3.45 0.2834
2025-04-23 2025-03-31 13F ISHARES TR MBS ETF 464288588 998,373 40,689 4.25 93,627 6.92 0.3238
2025-01-30 2024-12-31 13F ISHARES TR MBS ETF 464288588 957,684 -24,060 -2.45 87,571 -6.90 0.3009
2024-10-30 2024-09-30 13F ISHARES TR MBS ETF 464288588 981,744 40,830 4.34 94,061 8.88 0.3347
2024-07-18 2024-06-30 13F ISHARES TR MBS ETF 464288588 940,914 -68,632 -6.80 86,385 -7.41 0.3305
2024-05-02 2024-03-31 13F ISHARES TR MBS ETF 464288588 1,009,546 -7,597 -0.75 93,302 -2.61 0.3596
2024-01-24 2023-12-31 13F ISHARES TR MBS ETF 464288588 1,017,143 -76,411 -6.99 95,805 -1.34 0.3856
2023-10-19 2023-09-30 13F ISHARES TR MBS ETF 464288588 1,093,554 -28,146 -2.51 97,108 -7.18 0.4323
2023-07-31 2023-06-30 13F ISHARES TR MBS ETF 464288588 1,121,700 82,007 7.89 104,615 6.22 0.4428
2023-04-25 2023-03-31 13F ISHARES TR MBS ETF 464288588 1,039,693 166,908 19.12 98,490 20.82 0.4464
2023-02-06 2022-12-31 13F ISHARES TR MBS ETF 464288588 872,785 -4,663 -0.53 81,518 1.45 0.3973
2022-11-04 2022-09-30 13F ISHARES TR MBS ETF 464288588 877,448 -43,486 -4.72 80,356 -10.50 0.4088
2022-07-29 2022-06-30 13F ISHARES TR MBS ETF 464288588 920,934 271,661 41.84 89,781 35.74 0.4216
2022-05-13 2022-03-31 13F ISHARES TR MBS ETF 464288588 649,273 -56,724 -8.03 66,141 -12.70 0.2582
2022-02-09 2021-12-31 13F ISHARES TR MBS ETF 464288588 705,997 14,296 2.07 75,767 1.29 0.2640
2021-11-02 2021-09-30 13F ISHARES TR MBS ETF 464288588 691,701 94,111 15.75 74,800 15.65 0.2868
2021-08-03 2021-06-30 13F ISHARES TR MBS ETF 464288588 597,590 244,185 69.09 64,677 68.80 0.2407
2021-05-14 2021-03-31 13F ISHARES TR MBS ETF 464288588 353,405 118,794 50.63 38,316 48.34 0.1522
2021-02-12 2020-12-31 13F ISHARES TR MBS ETF 464288588 234,611 61,793 35.76 25,830 35.38 0.1064
2020-11-13 2020-09-30 13F ISHARES TR MBS ETF 464288588 172,818 -13,055 -7.02 19,079 -7.28 0.0877
2020-08-14 2020-06-30 13F ISHARES TR MBS ETF 464288588 185,873 74,017 66.17 20,576 66.57 0.1012
2020-05-14 2020-03-31 13F ISHARES TR MBS ETF 464288588 111,856 -14,635 -11.57 12,353 -9.63 0.0721
2020-02-14 2019-12-31 13F ISHARES TR MBS ETF 464288588 126,491 1,290 1.03 13,669 0.81 0.0616
2019-11-14 2019-09-30 13F ISHARES TR MBS ETF 464288588 125,201 25,303 25.33 13,559 26.14 0.0653
2019-08-14 2019-06-30 13F ISHARES TR MBS ETF 464288588 99,898 17,766 21.63 10,749 23.04 0.0528
2019-05-15 2019-03-31 13F ISHARES TR MBS ETF 464288588 82,132 2,832 3.57 8,736 5.27 0.0472
2019-02-13 2018-12-31 13F ISHARES TR MBS ETF 464288588 79,300 79,300 8,299 0.0198
2018-11-14 2018-09-30 13F ISHARES TR MBS ETF 464288588 0 -4,300 -100.00 0 -100.00
2018-08-14 2018-06-30 13F ISHARES TR MBS ETF 464288588 4,300 4,300 448 0.0010
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.