Pulmatrix PULM Institutional Ownership

Updated Oct 5, 2026

Pulmatrix, Inc. (NASDAQ:PULM) was reported as a holding by 15 institutional investors in 13F filings for the quarter ended June 30, 2026.

• Their combined stake equaled 9.16% of outstanding shares in Q2 2026, up from 9.02% in Q1 2026.
• Total holdings of Pulmatrix shares rose 1.52% from Q1 2026, and the number of holders rose 25.00% from Q2 2025.
• Of the 15 holders, 5 added to their positions, 3 reduced their stakes and 7 left their positions unchanged in Q2 2026.
• Combined, institutional investors held 334.53K shares of PULM as of Q2 2026, up 5.01K from the prior quarter and down 228 from a year earlier.
• As of June 30, 2026, the biggest holder of Pulmatrix was Renaissance Technologies LLC with 122.7K shares, or 3.36% of shares outstanding.
• The biggest increases in PULM positions during Q2 2026 came from Renaissance Technologies LLC (+13.55K shares), SBI Securities Co., Ltd. (+1.2K shares) and UBS Group AG (+492 shares).
• On the other side, among holders that kept a position in Pulmatrix, the largest reductions in Q2 2026 came from Geode Capital Management, LLC (-11.33K shares), XTX Topco Ltd (-1.68K shares) and Vanguard Capital Management LLC (-1.3K shares).
• Per Business Quant, the top 10 investors in PULM for the quarter ended June 30, 2026 were Renaissance Technologies LLC (122.7K shares), BlackRock, Inc. (54.9K shares), Geode Capital Management, LLC (33.3K shares), Vanguard Capital Management LLC (32.29K shares), SBI Securities Co., Ltd. (31.29K shares), Shay Capital LLC (18.86K shares), Vanguard Fiduciary Trust Co (14.71K shares), State Street Corp (13.95K shares), XTX Topco Ltd (11.99K shares) and UBS Group AG (515 shares).