Merrimack Pharmaceuticals, Inc. MACK

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Held by insiders 1.19%

Held by institutions 62.98%

Float held by institutions 63.74%

Institutions 101

Top institutional holders
Holder	% held	Shares	Value	Reported
Newtyn Management, Llc	13.08%	1,873,694	23.05M	Jun 29, 2023
Western Standard, LLC	11.68%	1,672,463	20.57M	Jun 29, 2023
Blackrock Inc.	4.72%	676,290	8.32M	Jun 29, 2023
Vanguard Group Inc	3.89%	556,798	6.85M	Jun 29, 2023
Madison Avenue Partners, LP	3.86%	553,085	6.80M	Jun 29, 2023
Dimensional Fund Advisors LP	3.21%	459,960	5.66M	Jun 29, 2023

Top mutual fund holders
Holder	% held	Shares	Value	Reported
Vanguard Total Stock Market Index Fund	2.00%	286,028	3.52M	Jun 29, 2023
iShares Russell 2000 ETF	1.53%	218,882	2.67M	Aug 30, 2023
Vanguard Extended Market Index Fund	1.38%	198,199	2.44M	Jun 29, 2023
DFA U.S. Micro Cap Series	1.04%	148,849	1.79M	Jul 30, 2023
DFA U.S. Small Cap Series	0.80%	115,240	1.38M	Jul 30, 2023
Fidelity Small Cap Index Fund	0.70%	99,808	1.20M	Jul 30, 2023

MACK insiders
Insider	Relation	Latest transaction	Date	Shares held
22NW, L.P.	Beneficial Owner of more than 10% of a Class of Security	Purchase	Apr 16, 2019	0
ANDERSEN ERIC D	Director and Beneficial Owner of more than 10% of a Class of Security	Purchase	Dec 27, 2023	0
ARYEH JASON M	Beneficial Owner of more than 10% of a Class of Security	Purchase	Jul 15, 2019	3,802
CROCKER GARY L	President	Purchase	Aug 10, 2023	0
DRUMMOND DARYL C	Officer	Sale	May 11, 2017	0
JFL CAPITAL MANAGEMENT, L.L.C.	Beneficial Owner of more than 10% of a Class of Security	Purchase	Jul 1, 2019	0

Ownership