Mersana Therapeutics Inc.
13F holders, Q3 2025 (September 30)7holders −76
0new positions
40sold out
$7.34avg. 13F price*
At the end of Q3 2025, 7 institutions reported holding Mersana Therapeutics Inc. in their 13F filings, down 76 from Q2 2025. 0 opened new positions and 40 sold out. The largest holders were Luminus Management LLC ($388K), Cwm, LLC ($22K) and Essential Partners LLC ($900).
- Company
- Mersana Therapeutics Inc.
- CUSIP
- 59045L106
- Latest filing quarter
- Q4 2025
History
Number of 13F holders
Total Exit/New Position Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 0 | $0 |
| Exits | 40 | $2.4M |
All 13F filers, Q2 2025 → Q3 2025: 9,246,219 shares sold, net −9,246,219 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 7 holders
| Luminus Management LLC | 0.35% | Reduce -95.2% | 50,000 | $388K |
| Cwm, LLC | 0.00% | Reduce -98.3% | 2,878 | $22K |
| Essential Partners LLC | 0.00% | Reduce -97.8% | 116 | $900 |
| Osaic Holdings, Inc. | 0.00% | Reduce -3.8% | 2,500 | $725 |
| IFP Advisors, Inc | 0.00% | Reduce -9.9% | 610 | $188 |
| EverSource Wealth Advisors, LLC | 0.00% | Reduce -99.8% | 14 | $109 |
| North Star Investment Management Corp. | 0.00% | Reduce -96.0% | 6 | $47 |
"% of holder's portfolio" is MERSANA THERAPEUTICS INC's weight in each manager's 13F, not the share of Mersana Therapeutics Inc. the manager owns.