SEC 13F Intelligence

MACKEURMerrimack Pharmaceuticals Inc

CUSIP 590328209 · Yahoo Finance ↗ · Google Finance ↗

Merrimack Pharmaceuticals Inc (MACKEUR) 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
MACKEUR
Quarters Tracked
10

Ownership Trend

Institutional holders
Q4 ’18: 42Q4 ’18Q1 ’19: 35Q2 ’19: 34Q2 ’19Q3 ’19: 31Q2 ’21: 32Q2 ’21Q4 ’21: 29Q4 ’22: 38Q4 ’22Q4 ’25: 1Q1 ’26: 1Q1 ’26Q2 ’26: 1filingsflow.com
Total reported value
Q4 ’18: $20MQ4 ’18Q1 ’19: $29MQ2 ’19: $31MQ2 ’19Q3 ’19: $23MQ2 ’21: $41MQ2 ’21Q4 ’21: $25MQ4 ’22: $67MQ4 ’22Q4 ’25: $0Q1 ’26: $0Q1 ’26Q2 ’26: $0filingsflow.com

Holders

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Manager% of PortfolioValueSharesQuarter
MassMutual Private Wealth & Trust, FSB$3.9B AUM—$024.5KQ2 2026

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