SEC 13F Intelligence

Merrimack Pharmaceuticals Inc

CUSIP 590328209

Merrimack Pharmaceuticals Inc has 1 institutional holders in Filings Flow’s 13F database, together reporting 24.5K shares worth $0 as of Q1 2026.

Institutional Holders
1
Q1 2026
Reported Value
$0
Ticker
unmapped
private placement or foreign
Quarters Tracked
28

Ownership Trend

Institutional holders
Q2 ’19: 31Q2 ’19Q3 ’19: 29Q4 ’19: 32Q1 ’20: 24Q2 ’20: 23Q2 ’20Q3 ’20: 24Q4 ’20: 28Q1 ’21: 33Q2 ’21: 32Q2 ’21Q3 ’21: 29Q4 ’21: 29Q1 ’22: 32Q2 ’22: 31Q2 ’22Q3 ’22: 31Q4 ’22: 37Q1 ’23: 41Q2 ’23: 51Q2 ’23Q3 ’23: 52Q4 ’23: 57Q1 ’24: 58Q2 ’24: 11Q2 ’24Q3 ’24: 2Q4 ’24: 2Q1 ’25: 1Q2 ’25: 1Q2 ’25Q3 ’25: 1Q4 ’25: 1Q1 ’26: 1filingsflow.com
Total reported value
Q2 ’19: $30MQ2 ’19Q3 ’19: $22MQ4 ’19: $17MQ1 ’20: $11MQ2 ’20: $16MQ2 ’20Q3 ’20: $22MQ4 ’20: $46MQ1 ’21: $41MQ2 ’21: $41MQ2 ’21Q3 ’21: $30MQ4 ’21: $24MQ1 ’22: $41MQ2 ’22: $40MQ2 ’22Q3 ’22: $25MQ4 ’22: $71MQ1 ’23: $75MQ2 ’23: $74MQ2 ’23Q3 ’23: $79MQ4 ’23: $106MQ1 ’24: $123MQ2 ’24: $5MQ2 ’24Q3 ’24: $0Q4 ’24: $370,685Q1 ’25: $0Q2 ’25: $0Q2 ’25Q3 ’25: $0Q4 ’25: $0Q1 ’26: $0filingsflow.com

Holders

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Manager% of PortfolioValueSharesQuarter
MassMutual Private Wealth & Trust, FSB$3.9B AUM—$024.5KQ1 2026

Holdings are reported up to 45 days after quarter end. Share counts are as filed and not adjusted for stock splits.