MERRIMACK PHARMACEUTICALS IN (MACK)
Institutional ownership reported to the SEC as of Q2 2026, across 25 quarters.
1
Reporting holders
$0
Reported value
0.0%
Held as options
+0
Holder change
Options share is the part of reported value carried in derivative lines rather than shares. A high figure means institutions are expressing a view on this security without owning much of it.
Holders
| Filer | Value | Shares | Their book | Held | Change |
|---|---|---|---|---|---|
| MassMutual Private Wealth & Trust, FSB | $0 | 24,500 | 0.00% | new | NEW |
Quarter by quarter
Coverage begins with the quarter ending 2018-12-31. Earlier filings exist only as occasional late amendments, too sparse to describe a market, so they are not shown.
| Quarter | Holders | Value | Shares | New | Added | Trimmed | Options |
|---|---|---|---|---|---|---|---|
| Q2 2026 | 1 | $0 | 24,500 | 1 | 0 | 0 | 0.0% |
| Q4 2024 | 1 | $370.7K | 24,500 | 1 | 0 | 0 | 0.0% |
| Q2 2024 | 5 | $5.3M | 351,554 | 0 | 1 | 2 | 0.0% |
| Q1 2024 | 63 | $137.1M | 9,190,802 | 9 | 13 | 20 | 1.0% |
| Q4 2023 | 63 | $130.7M | 9,370,366 | 5 | 21 | 9 | 3.9% |
| Q3 2023 | 60 | $109.1M | 8,464,921 | 9 | 17 | 16 | 4.3% |
| Q2 2023 | 58 | $101.0M | 8,000,073 | 16 | 16 | 10 | 2.6% |
| Q1 2023 | 46 | $99.3M | 7,355,282 | 8 | 13 | 8 | 8.9% |
| Q4 2022 | 41 | $88.3M | 6,925,290 | 10 | 12 | 8 | 10.2% |
| Q3 2022 | 38 | $30.4M | 8,011,502 | 3 | 5 | 12 | 1.1% |
| Q2 2022 | 38 | $48.4M | 8,063,330 | 1 | 10 | 9 | 0.8% |
| Q1 2022 | 40 | $50.7M | 7,904,130 | 8 | 7 | 8 | 2.7% |
| Q4 2021 | 36 | $31.7M | 7,524,385 | 3 | 3 | 9 | 7.2% |
| Q3 2021 | 37 | $38.1M | 7,677,527 | 2 | 4 | 11 | 2.8% |
| Q2 2021 | 43 | $50.6M | 7,871,829 | 5 | 7 | 16 | 0.7% |
| Q1 2021 | 44 | $51.4M | 7,932,966 | 7 | 14 | 7 | 3.2% |
| Q4 2020 | 38 | $61.7M | 8,053,983 | 7 | 5 | 7 | 10.1% |
| Q3 2020 | 34 | $28.8M | 6,986,668 | 5 | 8 | 6 | 3.8% |
| Q2 2020 | 34 | $20.9M | 6,156,804 | 4 | 3 | 8 | 1.8% |
| Q1 2020 | 34 | $14.0M | 6,459,747 | 1 | 2 | 12 | 0.8% |
| Q4 2019 | 42 | $22.4M | 7,005,953 | 8 | 6 | 11 | 1.7% |
| Q3 2019 | 42 | $30.0M | 6,600,301 | 5 | 10 | 11 | 1.1% |
| Q2 2019 | 46 | $39.5M | 6,445,074 | 6 | 10 | 14 | 1.3% |
| Q1 2019 | 49 | $37.9M | 5,428,036 | 7 | 11 | 16 | 0.4% |
| Q4 2018 | 50 | $24.0M | 6,208,258 | 3 | 0 | 2 | 0.1% |