SPDR PORTFOLIO MORTGAGE BACK (SPMB) Institutional Ownership and Insiders Activity

SPDR PORTFOLIO MORTGAGE BACK (SPMB) is widely held by institutional investors, with 250 firms reporting positions valued at approximately $6.37B based on SEC Form 13F filings for the quarter ended June 30, 2026.

Financial Engines Advisors L.L.C. is the largest disclosed holder, reporting approximately $4.39B in SPMB holdings in its latest filing.

Institutional ownership remains highly concentrated, with Financial Engines Advisors L.L.C. representing the majority of disclosed value.