Ranked by reported Q1 2026 13F market value
Share of total reported institutional value in PULM held by the largest 10 / 25 filers.
| # | Institution | Shares Held | Market Value | QoQ Change | Ownership % | % of Fund |
|---|---|---|---|---|---|---|
| 1 | RENAISSANCE TECHNOLOGIES LLC | 109K | $141K | -1.6% | 2.988% | 0.00% |
| 2 | BlackRock, Inc. | 55K | $71K | -0.8% | 1.503% | 0.00% |
| 3 | GEODE CAPITAL MANAGEMENT, LLC | 45K | $58K | +9.0% | 1.222% | 0.00% |
| 4 | VANGUARD CAPITAL MANAGEMENT LLC | 34K | $43K | β | 0.920% | 0.00% |
| 5 | SBI Securities Co., Ltd. | 30K | $39K | -45.5% | 0.824% | 0.00% |
| 6 | VANGUARD FIDUCIARY TRUST CO | 15K | $19K | β | 0.403% | 0.00% |
| 7 | JANE STREET GROUP, LLC | 15K | $19K | β | 0.399% | 0.00% |
| 8 | STATE STREET CORP | 14K | $18K | 0.0% | 0.382% | 0.00% |
| 9 | XTX Topco Ltd | 14K | $18K | β | 0.374% | 0.00% |
| 10 | Tower Research Capital LLC (TRC) | 207 | $267 | -77.3% | 0.006% | 0.00% |
| 11 | UBS Group AG | 23 | $30 | β | 0.001% | 0.00% |
| 12 | Farther Finance Advisors, LLC | 7 | $9 | 0.0% | 0.000% | 0.00% |
| 13 | Allworth Financial LP | 3 | $4 | 0.0% | 0.000% | 0.00% |
| 14 | NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO | 1 | $1 | -92.3% | 0.000% | 0.00% |
| 15 | ROYAL BANK OF CANADA | 7 | $0 | +16.7% | 0.000% | 0.00% |
denotes a marquee investor (Buffett, Burry, ARK, Tiger Global, Pershing Square, Baupost and other widely-followed managers). β% of Fundβ shows how much of that investorβs total 13F portfolio is invested in PULM β a direct measure of their conviction.
Filings activity in PULM during Q1 2026, grouped by how each filer changed its position.
8 quarters of 13F filings Β· Ξ columns show change vs prior quarter
| Quarter | Inst. Holders | Ξ Holders | Ownership % | Ξ Ownership | Total 13F Value | Ξ Value |
|---|---|---|---|---|---|---|
| Q1 2026 | 15 | +7.1% | 8.31% | 6.39 pp | $0M | 43% |
| Q4 2025 | 14 | +7.7% | 14.70% | 18.19 pp | $1M | 55% |
| Q3 2025 | 13 | +0.0% | 32.89% | 12.30 pp | $2M | 27% |
| Q2 2025 | 13 | +8.3% | 45.19% | +1.66 pp | $2M | +3.8% |
| Q1 2025 | 12 | +0.0% | 43.53% | 0.75 pp | $2M | 1.7% |
| Q4 2024 | 12 | 20% | 44.28% | +33.21 pp | $2M | +300% |
| Q3 2024 | 15 | +7.1% | 11.07% | +1.48 pp | $1M | +15% |
| Q2 2024 | 14 | β | 9.59% | β | $0M | β |
Source: SEC 13F institutional filings. Ownership % requires market cap data and will show once linked. Ξ columns compare to the immediately prior filed quarter.
Quick answers to the most common questions about buying PULM stock.
Based on Q1 2026 13F filings, institutional ownership of Pulmatrix, Inc. stands at 8.3%, held across 15 reporting institutions.
RENAISSANCE TECHNOLOGIES LLC is the largest reported institutional holder of PULM, with approximately 109,148 shares worth $0.00B as of Q1 2026.
Yes β 2 widely-followed marquee investors appear among the top 25 institutional holders of PULM, including RENAISSANCE TECHNOLOGIES LLC, JANE STREET GROUP, LLC.
Our composite Smart Money Score for PULM is 47 out of 100 (Neutral). It combines net institutional buying activity, ownership shift, marquee investor presence, and holder-count growth.
5 institutions opened new positions in PULM during Q1 2026, while 4 fully exited. 0 added to existing positions and 9 trimmed.
PULM institutional ownership fell by 6.39 percentage points quarter-over-quarter, with a net change of +1 holders.
The top 10 institutions account for 100.0% of all reported 13F value in PULM, and the top 25 account for 100.0%.
All data is sourced from SEC Form 13F filings, which institutional investment managers with at least $100M in assets are required to file each quarter. We process every 13F filing from EDGAR and recompute the aggregates after each cycle. Insider transactions are sourced from Form 4 filings.
Pulmatrix, Inc. (PULM) Institutional Ownership