Who owns MBB?
iShares MBS ETF · iShares
1,026 institutions reported holding MBB, worth $35.2B, in Form 13F filings for June 30, 2026.
Top 10 institutional holders of MBB
| Firm | Location | Value | Shares | Change |
|---|---|---|---|---|
| Bank of America Corp. | Charlotte, NC | $6.5B | 68,261,267 | +2,053,970 shares |
| JPMorgan Chase & Co | New York, NY | $3.6B | 37,776,202 | +633,003 shares |
| Envestnet Asset Management Inc. | Berwyn, PA | $2.9B | 30,910,875 | +2,006,656 shares |
| LPL Financial LLC | Fort Mill, SC | $2.6B | 27,128,190 | −856,100 shares |
| UBS Group AG | Zurich, Switzerland | $1.7B | 18,496,926 | −3,340,299 shares |
| TIAA Wealth Investment Management LLC | New York, NY | $1.4B | 14,805,333 | +733,064 shares |
| Ameriprise Financial Inc. | Minneapolis, MN | $1.3B | 13,686,305 | +494,857 shares |
| Morgan Stanley | New York, NY | $1.1B | 11,538,279 | +746,091 shares |
| TIAA-CREF Individual & Institutional Services, LLC | Charlotte, NC | $725.8M | 7,678,893 | +199,122 shares |
| Truist Financial Corp. | Charlotte, NC | $523.8M | 5,541,462 | −238,077 shares |
The full list comes with the Advisors and Institutions package.
Sign up to see them allFrom SEC Form 13F, for managers with $100M+ in US securities. Change compares June 30, 2026 with March 31, 2026. “New position” means no holding in the prior filing we have.
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Frequently asked questions
Who owns MBB?
1,026 institutional managers reported holding MBB in Form 13F filings for June 30, 2026, worth $35.2B in total. The largest reported position was held by Bank of America Corp., at $6.5B.
Did institutions buy or sell MBB last quarter?
Reported 13F value rose 2.5% from March 31, 2026, which includes price moves as well as buying and selling. 106 firms reported a new position and 76 sold all of theirs.
What is a Form 13F?
A quarterly report filed with the SEC by institutional investment managers with $100 million or more in qualifying US securities. It lists their long positions at quarter end. It doesn't cover retail investors, cash, short positions, or managers under the threshold, so it shows part of a fund's ownership, not all of it.
How often is MBB ownership data updated?
13F filings are due 45 days after each quarter ends. The next set is due around mid-November. Positions can be up to about four and a half months old by the time a new set arrives.