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ISSUER PROFILE · CIK 0001574235 · CUSIP 74584P301

Pulmatrix, Inc.PULM

7 13D/G filings 4 distinct filers 0 insider transactions (365d)
1 UNCLEAR

Post-Filing Returns · across 1 activist filings on this issuer

Median 30d
avg —
Median 60d
avg —
Median 90d
avg —
Median 180d
avg —

Returns measured from each activist filing's date_of_event, split + dividend adjusted via Yahoo Finance.

Cross-Reference Snapshot

Activist filings
7
1 SCHEDULE 13D · 6 SC
Distinct filers
4
multi-activist cluster
Insiders (365d)
0
0 buys · 0 sales
Latest short DTC
1.38
as of 2026-05-29

13D/G Filings Timeline · 7 total

FiledFormFilerStakeSharesIntent
2026-04-22 SCHEDULE 13D RCM Eos PIPE HOLDINGS, LLC 9.99% 405,358 UNCLEAR view →
2024-01-02 SC SABBY MANAGEMENT, LLC view →
2019-07-17 SC Polaris Venture Partners V, L.P. view →
2019-03-22 SC ARCH Venture Fund VII, L.P. view →
2018-04-12 SC Polaris Venture Partners V, L.P. view →
2018-04-12 SC Arch Venture Fund VII LP view →
2018-01-05 SC Arch Venture Fund VII LP view →

FINRA Short Interest History

SettlementShort InterestDays to Cover% Δ vs prior
2026-05-29 24,832 1.38 -26.8%
2026-05-15 33,902 2.14 -16.1%
2026-04-30 40,413 1.00 +106.2%
2026-04-15 19,602 1.00 +143.4%
2026-03-31 8,053 1.00 +221.5%
2026-03-13 2,505 1.00 -9.9%
2026-02-27 2,779 1.00 -35.3%
2026-02-13 4,293 1.00 +2.3%
2026-01-30 4,195 1.00 -40.4%
2026-01-15 7,035 1.00 -38.1%
2025-12-31 11,368 1.00 +164.4%
2025-12-15 4,299 1.00 -25.1%

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