Latest Period
Q1 2026
Security Snapshot
ISHARES TR - MBS ETF (MBB) Institutional Ownership
CUSIP: 464288588
13F Institutional Holders and Ownership History from Q1 2014 to Q1 2026
Institutions Reporting
1,015
Shares (Excl. Options)
367,808,474
Price
$94.95
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- Security type / class
- Equity / MBS ETF
- Symbol
- MBB
- All holders as of 31 Mar 2026
- Q1 2026
- Total 13F shares
- 367,808,474
- Total 13F value
- $34,913,267,928
- Portfolio coverage rank
- 0.06%
- Share change
- +242,772
- Value change
- +$20,417,644
- Number of holders
- 1,015
- SEC-reported price per share
- $94.35
Latest holder snapshot
5 signals
Issuer context
Names, identifiers, and filing context for this profile.
1 identity field
13F Shares, Excluding Options vs Price
13F Value, Excluding Options
Total Investors
Key facts
- MBB - ISHARES TR - MBS ETF is tracked under CUSIP 464288588.
- 1015 institutions reported positions in Q1 2026.
- Schedule 13D/13G significant owner rows are not currently available.
Change
- Holder count moved from 1,015 to 1,015 between Q4 2025 and Q1 2026.
- SEC-reported value moved from $33,025,130,932 to $34,913,267,928.
Research use
- You can quickly see who holds this security, then open quarter and manager detail pages for full evidence.
- 13F and Schedule 13D/13G sections are kept together so you can cross-check institutional and beneficial ownership context.
Evidence
Source: SEC Form 13F
Open SEC evidence
Latest holder context comes from 1015 institutions filings for Q1 2026.
Security key
464288588
Latest holder period
Q1 2026
13F holders
1,015
13D/G owners
0
CIK / CUSIP context first
Broader feeds
Recent Quarterly Holder Reports
Open recent reporting periods for CUSIP 464288588:
As of 31 Mar 2026, 1,015 institutional investors reported holding 367,808,474 shares of ISHARES TR - MBS ETF (MBB).
Quarter history
Institutional holders across reporting periods
Holder count, reported shares/value, and median price by quarter.
Periods
49
Latest
Q1 2026
Rows shown
1-25 of 49
| Period | 13F Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2026 Q1 | 367,808,474 | $34,913,267,928 | +$20,417,644 | $94.95 | 1,015 |
| 2025 Q4 | 346,792,433 | $33,025,130,932 | -$3,454,363,423 | $95.22 | 1,015 |
| 2025 Q3 | 383,149,919 | $36,451,741,273 | +$1,805,762,702 | $95.15 | 925 |
| 2025 Q2 | 366,181,911 | $34,368,798,470 | +$2,370,976,359 | $93.89 | 930 |
| 2025 Q1 | 340,273,692 | $31,904,410,060 | -$1,314,103,353 | $93.78 | 923 |
| 2024 Q4 | 356,418,139 | $32,683,096,138 | +$2,889,674,904 | $91.68 | 920 |
| 2024 Q3 | 323,523,942 | $30,944,032,397 | +$1,544,814,635 | $95.81 | 870 |
| 2024 Q2 | 306,523,407 | $28,146,559,694 | +$1,658,767,399 | $91.81 | 830 |
| 2024 Q1 | 287,825,907 | $26,598,237,369 | +$291,025,795 | $92.42 | 834 |
| 2023 Q4 | 283,213,749 | $26,646,271,004 | +$666,283,476 | $94.08 | 858 |
| 2023 Q3 | 272,186,626 | $24,204,404,688 | -$17,334,997 | $88.80 | 762 |
| 2023 Q2 | 271,829,929 | $25,363,879,748 | +$1,838,376,245 | $93.26 | 778 |
| 2023 Q1 | 252,223,151 | $23,899,937,527 | +$1,880,103,990 | $94.73 | 741 |
| 2022 Q4 | 231,979,759 | $21,521,968,234 | +$3,293,655,713 | $92.75 | 750 |
| 2022 Q3 | 196,626,646 | $18,021,256,920 | -$451,792,557 | $91.58 | 675 |
| 2022 Q2 | 201,823,103 | $19,689,866,084 | -$181,617,198 | $97.49 | 692 |
| 2022 Q1 | 202,161,676 | $20,604,621,834 | -$1,185,663,224 | $101.87 | 708 |
| 2021 Q4 | 214,544,937 | $23,045,960,642 | +$736,874,724 | $107.43 | 715 |
| 2021 Q3 | 206,410,181 | $22,321,261,297 | -$679,995,315 | $108.14 | 680 |
| 2021 Q2 | 213,734,638 | $23,131,780,415 | +$67,359,130 | $108.23 | 669 |
| 2021 Q1 | 212,749,925 | $23,064,886,149 | +$1,008,056,124 | $108.42 | 692 |
| 2020 Q4 | 203,409,883 | $22,402,372,075 | +$3,113,850,030 | $110.13 | 685 |
| 2020 Q3 | 172,818,410 | $19,076,420,907 | +$1,229,861,900 | $110.40 | 567 |
| 2020 Q2 | 161,739,164 | $17,892,222,855 | -$686,222,750 | $110.70 | 538 |
| 2020 Q1 | 166,920,761 | $18,429,520,136 | -$982,682,940 | $110.44 | 537 |