Institutional Ownership
Merrimack Pharmaceuticals In
CUSIP 590328209COMMACKEURQ1 2026
13D / 13G Filings
22
Schedule 13D/13G on record
Beneficial Filers
10
Distinct reporting persons
Largest Stake
15.5%
Max % of class reported
Institutional Holders
1
13F filers (latest quarter)
Beneficial Owners — Schedule 13D / 13G
22 filings · latest Mar 7, 2024
| # | Filed | Reporting Person | Form | % of Class | Shares | Filing |
|---|---|---|---|---|---|---|
| 1 | Mar 7, 2024 | Blackrock Inc. | 13G/A | 5.0% | 715.3K | SEC |
| 2 | Feb 22, 2024 | Adar1 Partners, LP | 13G | 6.3% | 902.4K | SEC |
| 3 | Feb 14, 2024 | 22nw Fund, LP | 13G/A | — | — | SEC |
| 4 | Jan 31, 2024 | Blackrock Inc. | 13G | 5.2% | 743.6K | SEC |
| 5 | Jan 25, 2024 | Newtyn Management, LLC | 13D/A | 13.1% | 1.87M | SEC |
| 6 | Dec 13, 2023 | Western Standard LLC | 13D/A | 15.5% | 2.22M | SEC |
| 7 | Aug 14, 2023 | Western Standard LLC | 13D/A | 13.9% | 1.99M | SEC |
| 8 | Feb 14, 2023 | Point72 Asset Management, L.P. | 13G/A | — | — | SEC |
| 9 | Feb 13, 2023 | 22nw Fund, LP | 13G/A | 7.6% | 1.02M | SEC |
| 10 | Aug 4, 2022 | Point72 Asset Management, L.P. | 13G | 6.7% | 900.5K | SEC |
12 more beneficial-ownership filings on Premium
See the full Schedule 13D/13G history for Merrimack Pharmaceuticals In.
Unlock full historyTop Institutional Holders (13F)
Largest reported positions · latest quarter
| # | Fund | Shares | Value |
|---|---|---|---|
| 1 | Massmutual Private Wealth & Trust, Fsb | 24.5K | $0 |