iShares Trust - iShares MBS ETF
US ˙ NasdaqGM ˙ US4642885887

SecurityMBB / iShares Trust - iShares MBS ETF
InstitutionBetterment LLC
Latest Disclosed Ownership61,327 shares
Latest Disclosed Value $ 5,823
Betterment LLC reports 7.44% increase in ownership of MBB / iShares Trust - iShares MBS ETF

On May 14, 2026 - Betterment LLC filed a 13F-HR form disclosing ownership of 61,327 shares of iShares Trust - iShares MBS ETF (US:MBB) valued at $5,822,999 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 57,082 shares of iShares Trust - iShares MBS ETF. This represents a change in shares of 7.44% during the quarter. The current value of the position is $5,777,617 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-14 2026-03-31 13F ISHARES TR MBS ETF 464288588 61,327 4,245 7.44 6 0.00 0.0110
2026-02-12 2025-12-31 13F ISHARES TR MBS ETF 464288588 57,082 1,043 1.86 5 0.00 0.0104
2025-11-13 2025-09-30 13F ISHARES TR MBS ETF 464288588 56,039 -978 -1.72 5 0.00 0.0105
2025-08-14 2025-06-30 13F ISHARES TR MBS ETF 464288588 57,017 10,658 22.99 5 25.00 0.0114
2025-05-15 2025-03-31 13F ISHARES TR MBS ETF 464288588 46,359 -43,341 -48.32 4 -50.00 0.0103
2025-02-14 2024-12-31 13F ISHARES TR MBS ETF 464288588 89,700 4,686 5.51 8 0.00 0.0196
2024-11-14 2024-09-30 13F ISHARES TR MBS ETF 464288588 85,014 -13,838 -14.00 8 -11.11 0.0194
2024-08-14 2024-06-30 13F ISHARES TR MBS ETF 464288588 98,852 -26,260 -20.99 9 -18.18 0.0235
2024-05-10 2024-03-31 13F ISHARES TR MBS ETF 464288588 125,112 -5,104 -3.92 12 -8.33 0.0310
2024-02-09 2023-12-31 13F ISHARES TR MBS ETF 464288588 130,216 -25,274 -16.25 12 -7.69 0.0353
2023-11-09 2023-09-30 13F ISHARES TR MBS ETF 464288588 155,490 -44,997 -22.44 14 -27.78 0.0437
2023-08-07 2023-06-30 13F ISHARES TR MBS ETF 464288588 200,487 -32,643 -14.00 19 -18.18 0.0579
2023-05-15 2023-03-31 13F ISHARES TR MBS ETF 464288588 233,130 -12,535 -5.10 22 0.00 0.0715
2023-02-13 2022-12-31 13F ISHARES TR MBS ETF 464288588 245,665 112,954 85.11 23 -99.83 0.0782
2022-11-14 2022-09-30 13F ISHARES TR MBS ETF 464288588 132,711 0 0.00 12,938 0.00 0.0463
2022-08-10 2022-06-30 13F ISHARES TR MBS ETF 464288588 132,711 -11,779 -8.15 12,938 -12.10 0.0463
2022-05-16 2022-03-31 13F ISHARES TR Common 464288588 144,490 13,108 9.98 14,719 4.29 0.0468
2022-02-15 2021-12-31 13F ISHARES TR Common 464288588 131,382 31,164 31.10 14,114 30.23 0.0439
2021-11-15 2021-09-30 13F ISHARES TR Common 464288588 100,218 5,533 5.84 10,838 5.76 0.0362
2021-08-10 2021-06-30 13F ISHARES TR Common 464288588 94,685 26,361 38.58 10,248 38.34 0.0349
2021-06-01 2021-03-31 13F ISHARES TR Common 464288588 68,324 -284 -0.41 7,408 -1.96 0.0279
2021-02-12 2020-12-31 13F ISHARES TR Common 464288588 68,608 13,478 24.45 7,556 24.15 0.0317
2020-11-10 2020-09-30 13F ISHARES TR Common 464288588 55,130 1,689 3.16 6,086 2.87 0.0299
2020-08-11 2020-06-30 13F ISHARES TR Common 464288588 53,441 -16,461 -23.55 5,916 -23.37 0.0315
2020-05-14 2020-03-31 13F ISHARES TR Common 464288588 69,902 -12,299 -14.96 7,720 -13.09 0.0479
2020-01-31 2019-12-31 13F ISHARES TR Common 464288588 82,201 42,139 105.18 8,883 106.05 0.0459
2019-11-07 2019-09-30 13F ISHARES TR Common 464288588 40,062 0 0.00 4,311 0.00 0.0244
2019-08-14 2019-06-30 13F ISHARES TR Common 464288588 40,062 -10,200 -20.29 4,311 -19.36 0.0244
2019-04-11 2019-03-31 13F ISHARES TR Common 464288588 50,262 -9,102 -15.33 5,346 -13.94 0.0323
2019-02-06 2018-12-31 13F ISHARES TR Common 464288588 59,364 -1,118 -1.85 6,212 -0.61 0.0436
2018-11-14 2018-09-30 13F ISHARES TR Common 464288588 60,482 -10,641 -14.96 6,250 -15.65 0.0411
2018-08-13 2018-06-30 13F ISHARES TR Common 464288588 71,123 13,781 24.03 7,410 24.48 0.0526
2018-05-14 2018-03-31 13F ISHARES TR Common 464288588 57,342 29,232 103.99 5,953 98.70 0.0433
2018-02-14 2017-12-31 13F ISHARES TR Common 464288588 28,110 20,018 247.38 2,996 245.56 0.0241
2017-11-17 2017-09-30 13F ISHARES TR Common 464288588 8,092 3,889 92.53 867 93.10 0.0079
2017-08-14 2017-06-30 13F ISHARES TR Common 464288588 4,203 225 5.66 449 5.90 0.0047
2017-05-11 2017-03-31 13F ISHARES TR Common 464288588 3,978 45 1.14 424 1.44 0.0051
2017-02-14 2016-12-31 13F ISHARES TR Common 464288588 3,933 45 1.16 418 -2.34 0.0062
2016-11-14 2016-09-30 13F ISHARES TR Common 464288588 3,888 63 1.65 428 1.66 0.0072
2016-08-15 2016-06-30 13F ISHARES TR Common 464288588 3,825 3,825 421 0.0086
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.