Mersana TherapeuticsMRSN
13F holders, Q1 2026 (March 31)1holders −47
0new positions
46sold out
$29.00avg. 13F price*
At the end of Q1 2026, 1 institutions reported holding Mersana Therapeutics Inc. (MRSN) in their 13F filings, down 47 from Q4 2025. 0 opened new positions and 46 sold out. The largest holder was IFP Advisors, Inc ($87).
- Company
- Mersana Therapeutics Inc.
- CUSIP
- 59045L205
- Latest filing quarter
- Q1 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 0 | $0 |
| Exits | 46 | $58.7M |
All 13F filers, Q4 2025 → Q1 2026: 2,034,453 shares sold, net −2,034,453 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 1 holders
| IFP Advisors, Inc | 0.00% | No change | 3 | $87 |
"% of holder's portfolio" is MRSN's weight in each manager's 13F, not the share of Mersana Therapeutics Inc. the manager owns.