MBB Institutional Ownership Changes & 13F Activity

ISHARES MBS ETF (MBB). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings. This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Sequoia Financial Advisors, Renaissance Technologies LLC, Parnassus Endeavor Fund, and Torray Fund.

Related MBB Institutional Insights

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q1 2026Sequoia Financial AdvisorsSell-26,92924,156$2,293,651
Q1 2026Renaissance Technologies LLCBuy19,61428,000$2,658,600
Q4 2025Renaissance Technologies LLCSell-35,5148,386$798,515
Q3 2025Sequoia Financial AdvisorsBuy5,16151,085$4,860,737
Q2 2025Sequoia Financial AdvisorsSell-85945,924$4,311,760
Q1 2025Sequoia Financial AdvisorsBuy39,26346,783$4,387,311
Q4 2024Parnassus Endeavor FundSell-77,752155,000$14,210,400
Q4 2024Sequoia Financial AdvisorsBuy4,0707,520$689,434
Q3 2024Sequoia Financial AdvisorsSell-1833,450$330,545
Q2 2024Sequoia Financial AdvisorsSell-14,3533,633$333,507
Q1 2024Sequoia Financial AdvisorsSell-1,09717,986$1,662,293
Q4 2023Parnassus Endeavor FundBuy82,941232,752$21,897,308
Q4 2023Sequoia Financial AdvisorsBuy1,25819,083$1,795,289
Q3 2023Parnassus Endeavor FundBuy135,403149,811$13,303,217
Q3 2023Sequoia Financial AdvisorsSell-3,08217,825$1,582,875
Q2 2023Parnassus Endeavor FundBuy14,40814,408$1,343,762
Q2 2023Sequoia Financial AdvisorsBuy1,15120,907$1,949,858
Q1 2023Sequoia Financial AdvisorsSell-1,58119,756$1,871,450
Q4 2022Renaissance Technologies LLCSell-117,10043,900$4,072
Q4 2022Sequoia Financial AdvisorsSell-4,64021,337$1,978,967
Q3 2022Sequoia Financial AdvisorsSell-1,05025,977$2,379
Q2 2022Renaissance Technologies LLCBuy145,986161,000$15,696
Q2 2022Sequoia Financial AdvisorsSell-3,86327,027$2,635
Q1 2022Sequoia Financial AdvisorsSell-32830,890$3,147
Q4 2021Torray FundBuy2,3922,392$257
Q4 2021Sequoia Financial AdvisorsSell-1,71231,218$3,354
Q2 2021Renaissance Technologies LLCSell-148,79115,014$1,625
Q2 2021Sequoia Financial AdvisorsSell-73632,930$3,564
Q1 2021Sequoia Financial AdvisorsBuy3,43633,666$3,650
Q4 2020Renaissance Technologies LLCBuy42,705163,805$18,040

Frequently asked questions about MBB activity

  • Which institutional owners are buying MBB?

    Institutional owners buying MBB include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in MBB activity?

    "Buy" means an investor increased their reported position in MBB compared to the prior reporting period. This reflects growing exposure to ISHARES MBS ETF (MBB) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in MBB increasing?

    Institutional interest in MBB can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.