SUTRO BIOPHARMA INC (STRO) Institutional Ownership Changes & 13F Activity

SUTRO BIOPHARMA INC (STRO). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings (Q2 2026). This page analyzes institutional buying and selling activity, new holdings, and sold-out positions in the latest reporting period. Notable filers include Merck & Co., Inc., Aju Ib Investment Co., Ltd., Fortitude Family Office, Llc, Eversource Wealth Advisors, Llc, and Advisory Services Network, Llc.

InstitutionTypeChange in sharesChange Position %SharesReported stock balancePortfolio quarterFiling date
Advisory Services Network, LlcSell-15-100.0%0$0.00Q2 2026May 15, 2026
Eversource Wealth Advisors, LlcSell-45-100.0%0$0.00Q2 2026May 14, 2026
Merck & Co., Inc.Sell-272,351-100.0%0$0.00Q2 2026May 13, 2026
Aju Ib Investment Co., Ltd.Sell-17,500-100.0%0$0.00Q2 2026May 08, 2026
Fortitude Family Office, LlcSell-56-100.0%0$0.00Q2 2026Apr 16, 2026
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Frequently asked questions about STRO activity

  • Which institutional owners are buying STRO?

    Institutional owners buying STRO 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 STRO activity?

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

  • Is institutional interest in STRO increasing?

    Institutional interest in STRO 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.

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