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Who owns MBB?

Institutional ownership of iShares MBS ETF from Form 13F, Q2 2026

1,023 institutional managers reported holding iShares MBS ETF (MBB) in Form 13F filings for Q2 2026, with 371,693,822 shares worth $35.2B. The largest reported holder was Bank of America Corp. Managers that filed both quarters added a net 8,994,042 shares (+2.5%). 76 opened new positions and 76 sold out.

Funds holding
1,023
Value held
$35.2B
New / sold out
76 / 76
Net shares, same filers
+2.5%

Holdings as of June 30, 2026, the end of Q2 2026. Managers have 45 days after a quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.

Largest holders of MBB

FundValueShare of 13F holdingsSharesMove
Bank of America Corp$6.5B18.4%68,261,267Added
JPMorgan Chase & Co$3.6B10.2%37,776,202Added
Envestnet Asset Management Inc$2.9B8.3%30,910,875Added
LPL Financial LLC$2.6B7.3%27,128,190Trimmed
UBS Group AG$1.7B5.0%18,496,926Trimmed
TIAA Wealth Investment Management LLC$1.4B4.0%14,805,333Added
Ameriprise Financial Inc$1.3B3.7%13,686,305Added
Morgan Stanley$1.1B3.1%11,538,279Added
Tiaa-Cref Individual & Institutional Services, LLC$726M2.1%7,678,893Added
Truist Financial Corp$524M1.5%5,541,462Trimmed
UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC$404M1.2%4,278,858Trimmed
Stifel Financial Corp$354M1.0%3,741,705Added
PNC Financial Services Group, Inc.$310M0.9%3,279,174Added
Allworth Financial LP$287M0.8%3,034,893Trimmed
Wells Fargo & Company$275M0.8%2,912,422Added
Bank of Montreal$265M0.8%2,803,720Trimmed
State of Tennessee, Department of Treasury$251M0.7%2,654,254Added
Midland Wealth Advisors, LLC$238M0.7%2,518,894Added
Bank of New York Mellon Corp$229M0.7%2,420,276Added
Sei Investments Co$225M0.6%2,380,025Added
Composition Wealth, LLC$222M0.6%2,352,562Added
BlackRock, Inc.$218M0.6%2,311,312Added
Cetera Investment Advisers$203M0.6%2,146,275Added
Envestnet Portfolio Solutions, Inc.$200M0.6%2,119,612Added
Cliftonlarsonallen Wealth Advisors, LLC$185M0.5%1,957,539Added

Share of 13F holdings is each fund's shares as a share of the 371,693,822 MBB shares all 13F filers reported, not of shares outstanding.

Biggest buyers in Q2 2026

  1. Bank of America Corp Added+$194M
  2. Envestnet Asset Management Inc Added+$190M
  3. Goldman Sachs Group Inc Added+$134M
  4. NewEdge Advisors, LLC New+$93.0M
  5. MAI Capital Management Added+$75.9M
  6. Pathstone Holdings, LLC Added+$75.1M
  7. Morgan Stanley Added+$70.5M
  8. TIAA Wealth Investment Management LLC Added+$69.5M
  9. JPMorgan Chase & Co Added+$60.1M
  10. Mirae Asset Global Investments Co., Ltd. Added+$58.2M

Biggest sellers in Q2 2026

  1. UBS Group AG Trimmed-$316M
  2. Barclays PLC Trimmed-$163M
  3. Evoke Wealth, LLC Sold out-$84.1M
  4. LPL Financial LLC Trimmed-$80.9M
  5. Bank of Montreal Trimmed-$58.8M
  6. Dymon Asia Capital (singapore) Pte. LTD. Sold out-$49.7M
  7. TIAA Trust, National Association Trimmed-$35.8M
  8. Avidian Wealth Enterprises, LLC Trimmed-$33.6M
  9. Allworth Financial LP Trimmed-$27.9M
  10. Independent Advisor Alliance Trimmed-$23.2M

The change in shares since the quarter before, adjusted for stock splits and priced at the Q2 2026 value per share. Funds bought $2.1B and sold $1.2B; 541 added and 243 trimmed.

Questions about MBB ownership

Who owns MBB stock?
1,023 institutional investment managers reported MBB positions in their Form 13F filings for Q2 2026, holding 371,693,822 shares worth $35.2B in total. Bank of America Corp reported the largest position.
Are funds buying or selling MBB?
In Q2 2026, 76 managers opened new MBB positions, 541 added, 243 trimmed and 76 sold out. Managers that filed in both quarters added a net 8,994,042 shares.
How current is this MBB institutional ownership data?
It covers holdings as of the end of Q2 2026. Managers have 45 days after the quarter ends to file Form 13F (by August 14, 2026 for Q2 2026), so positions may have changed since.

From the SEC's Form 13F data sets for Q2 2026: every 13F holdings report, matched to MBB by CUSIP. Options are left out. MBB news and filings · MBB insider trades · Top funds