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$PULM
$1.44 -$0.04 (2.7%) Close

Ownership

13F as of Q2 2026 · 3.7M shares outstanding

Who owns PULM?

By type of holder
Institutions 9.2% Everyone else 90.8%

No insider has reported a holding in the last two years, so insiders are counted in "Everyone else".

Concentration Top 10 holders own 41.7%
Rapha Capital Management, LLC 11.1% · Slawin Kevin M. 11.1%
Institutional ownership
9.2%
+0.1 pts vs last qtr
Institutional holders
15
0 vs last qtr
Net shares bought
+5.0K
by institutions in Q2 2026
New / sold out
2 / 2
positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026
  • Shay Capital LLC NEW +18.9K
  • Renaissance Technologies LLC +13.6K

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Biggest sellers in Q2 2026
  • Jane Street Group, LLC SOLD OUT −14.6K
  • Geode Capital Management, LLC −11.3K

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Who is planning to sell?

No insider has filed a notice of proposed sale (Form 144) for Pulmatrix Inc in the last 12 months.

Is your stake being diluted?

Diluted share count, FY2022–FY2025
−99.9%
−89.81% a year
Each share's claim on the business
+94298.5%
grew without buying or selling a share
Spent on buybacks vs paid in stock
— vs $2.6M
over 4 fiscal years
Diluted shares, split-adjusted
3.5M1.74B3.48B2022: 3.45B shares'222023: 3.7M shares'232024: 3.7M shares'242025: 3.7M shares'25
Buybacks Stock-based comp
$0$557.0K$1.1M2022 buybacks: $02022 stock comp: $1.1M'222023 buybacks: $02023 stock comp: $954.0K'232024 buybacks: $02024 stock comp: $511.0K'242025 buybacks: $02025 stock comp: $25.0K'25

How patient are the owners?

Institutional shares by how long they've been held
5+ years0% 3–5 years81% 1–3 years9% Under 1 year9%
Quarterly turnover
9.6%
of institutional shares changed hands
Top 10 managers, median time held
4.3 years

Super Investors

Investment managers reporting PULM on Form 13F
RT
Renaissance Technologies LLC
Shares
122.7K
% of company
3.36%
Change vs last qtr
+13.6K (+12.4%)
Held since
2022
B
BlackRock, Inc.
Shares
54.9K
% of company
1.50%
Change vs last qtr
Unchanged
Held since
2022

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Institutional Funds

Mutual funds and ETFs reporting PULM on Form N-PORT; together they hold 2.1% of the company
VE
Vanguard Extended Market Index Fund
Vanguard Index Funds
Position value
$54.9K
% of company
0.88%
% of the fund
0.00%
As of
June 30, 2026
FE
Fidelity Extended Market Index Fund
Fidelity Concord Street Trust
Position value
$32K
% of company
0.63%
% of the fund
0.00%
As of
May 31, 2026

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Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G
RC
Rapha Capital Management, LLC
5%+ holder13D · 10.0%
Shares
405.4K
% of company
11.10%
Change vs last qtr
—
Held since
—
SK
Slawin Kevin M.
5%+ holder13D · 10.0%
Shares
405.4K
% of company
11.10%
Change vs last qtr
—
Held since
—

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