iShares MBS ETF (MBB)

ETF ยท Nasdaq

iShares MBS ETF (MBB) is an exchange-traded fund listed on Nasdaq, where it has traded since March 13, 2007.

Type
Exchange-traded fund
Listed On
Nasdaq
Listed Since
March 13, 2007

Institutional ownership

In 13F filings for the quarter ended June 30, 2026, 1,019 institutions reported holding MBB, with 371.1 million shares worth $35.1 billion in aggregate. The largest reported holder was Bank of America, with 68.3 million shares worth $6.5 billion. Of the 5 largest holders listed below, 3 added shares and 2 reduced their positions during the quarter.

InstitutionSharesValueQuarter change
Bank of America68,261,267$6.5BAdded 3.1%
JPMorgan Chase37,776,202$3.6BAdded 1.7%
Envestnet Asset Management30,910,875$2.9BAdded 6.94%
Lpl Financial27,128,190$2.6BReduced 3.06%
UBS Group22,775,784$2.2BReduced 12.86%

Form 13F is a quarterly report that institutional investment managers with at least $100 million in qualifying securities file with the SEC. It lists long positions as of the last day of the quarter and is due within 45 days of quarter end, so these holdings describe that date rather than today.

Frequently asked questions

What is MBB?

iShares MBS ETF (MBB) is an exchange-traded fund listed on Nasdaq, where it has traded since March 13, 2007.

Who are the largest institutional holders of MBB?

In 13F filings for the quarter ended June 30, 2026, the largest reported holders of MBB were Bank of America, JPMorgan Chase and Envestnet Asset Management.

How many institutions own MBB?

1,019 institutions reported a position in MBB for the quarter ended June 30, 2026, worth $35.1 billion in total.

Did institutions buy or sell MBB last quarter?

Of the 5 largest reported holders, 3 added shares and 2 reduced their positions during the quarter. Every reported holder and its change is on the SentiSense ownership page for MBB.

Every reported institutional holder, plus insider and congressional trades in MBB, on SentiSense.