Armata Pharmaceuticals, Inc. (ARMP) Institutional Ownership

Ownership Summary

Armata Pharmaceuticals, Inc. (NYSE:ARMP) is held by 36 institutional investors per 13F filings through December 2025.

• They owned 3.4% of outstanding stock in December 2025, up from 2.1% the prior quarter.
• Their total shares held in ARMP increased 64.91% from the prior quarter, while the number of investors in Armata Pharmaceuticals increased 44.0% year over year.
• Activity in ARMP broke down as 24 buyers, 1 sellers, and 11 unchanged among 36 total holders.
• Institutional investors collectively held 1.25Mn shares in Armata Pharmaceuticals as of December 2025, up by 491.12K shares quarter on quarter, and down 154.24K shares year over year.
• As of December 31, 2025, Madison Asset Management, LLC held the largest stake in Armata Pharmaceuticals with 2.11Mn shares, accounting for 5.82% of total shares outstanding.
• The largest buyers of Armata Pharmaceuticals for the quarter ending December 2025 were Madison Asset Management, LLC (2.11Mn), VANGUARD CAPITAL MANAGEMENT LLC (366.03K), MILLENNIUM MANAGEMENT LLC (231.9K), Dauntless Investment Group, LLC (84.45K), Sei Investments Co (74.19K).
• The largest sales of ARMP for the quarter ending December 2025 came from RENAISSANCE TECHNOLOGIES LLC (30.0K), Goldman Sachs Group Inc (29.37K), BlackRock, Inc. (7.71K), 683 Capital Management, LLC (2.86K), Tower Research Capital LLC (TRC) (1.33K).
• Business Quant data shows the 10 biggest positions in Armata Pharmaceuticals as of December 2025 are held by Madison Asset Management, LLC (2.11Mn), VANGUARD CAPITAL MANAGEMENT LLC (366.03K), MILLENNIUM MANAGEMENT LLC (257.99K), 683 Capital Management, LLC (137.0K), GEODE CAPITAL MANAGEMENT, LLC (114.56K), EDGEWOOD MANAGEMENT LLC (100.0K), Dauntless Investment Group, LLC (90.58K), Sei Investments Co (74.19K), VANGUARD FIDUCIARY TRUST CO (67.86K), BlackRock, Inc. (65.05K).