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Merrimack Pharmaceuticals Ownership

Who are the major shareholders and have insiders been buying or selling?

Recent Insider Transactions

NasdaqGM:MACK Recent Insider Transactions by Companies or Individuals
Date	Value	Name	Entity	Shares	Max Price
28 Dec 23	BuyUS$651,754	Western Standard, LLC	Company	49,550	US$13.35
07 Dec 23	BuyUS$1,298,472	Western Standard, LLC	Company	101,050	US$12.85
17 Nov 23	BuyUS$3,750	Western Standard, LLC	Company	300	US$12.50
14 Nov 23	BuyUS$627,125	Western Standard, LLC	Company	50,170	US$12.50
13 Nov 23	BuyUS$661,883	Western Standard, LLC	Company	53,632	US$12.39
09 Nov 23	BuyUS$289,319	Western Standard, LLC	Company	23,798	US$12.19

Insider Trading Volume

Insider Buying: Insufficient data to determine if insiders have bought more shares than they have sold in the past 3 months.

Ownership Breakdown

What is the ownership structure of MACK?
Owner Type	Number of Shares	Ownership Percentage
Private Companies	282	0.00191%
Individual Insiders	176,159	1.19%
Institutions	4,351,158	29.4%
Hedge Funds	4,948,557	33.5%
General Public	5,312,213	35.9%

Dilution of Shares: Shareholders have been diluted in the past year, with total shares outstanding growing by 3.7%.

Top Shareholders

Top 25 shareholders own 62.65% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
14.7%	Western Standard, LLC	2,172,513	US$32.9m	0%	29.87%
12.7%	Newtyn Management, LLC	1,873,694	US$28.3m	0%	3.79%
6.1%	ADAR1 Capital Management, LLC	902,350	US$13.7m	64.2%	3.87%
4.89%	BlackRock, Inc.	723,294	US$10.9m	-2.73%	no data
4.2%	The Vanguard Group, Inc.	620,847	US$9.4m	1.95%	no data
2.69%	Dimensional Fund Advisors LP	398,001	US$6.0m	-8.64%	no data
2.62%	Madison Avenue Partners, LP	387,221	US$5.9m	-30%	0.83%
2.02%	Sepio Capital, LP	298,545	US$4.5m	-2.65%	0.39%
1.84%	Geode Capital Management, LLC	272,015	US$4.1m	4.64%	no data
1.84%	Invesco Capital Management LLC	271,890	US$4.1m	3,570%	no data
1.67%	State Street Global Advisors, Inc.	246,853	US$3.7m	25.5%	no data
1.42%	Wittenberg Investment Management Inc	210,239	US$3.2m	0%	1.07%
1.1%	Renaissance Technologies LLC	162,184	US$2.5m	232%	no data
0.91%	Gary Crocker	135,105	US$2.0m	1.5%	no data
0.82%	Yakira Capital Management, Inc.	120,756	US$1.8m	123%	0.85%
0.79%	Northern Trust Global Investments	117,548	US$1.8m	0.55%	no data
0.64%	BNY Asset Management	94,895	US$1.4m	-5.29%	no data
0.52%	Susquehanna International Group, LLP, Asset Management Arm	77,397	US$1.2m	-4.02%	no data
0.25%	Ulrik Nielsen	36,898	US$558.3k	-70%	no data
0.23%	Bridgeway Capital Management, LLC	34,200	US$517.4k	0%	0.01%
0.2%	Charles Schwab Investment Management, Inc.	29,628	US$448.3k	0%	no data
0.16%	Eaton Vance Management	24,181	US$365.9k	32.2%	no data
0.14%	Two Sigma Investments, LP	20,401	US$308.7k	-6.56%	no data
0.13%	STRS Ohio	19,000	US$287.5k	476%	no data
0.1%	Morgan Stanley, Investment Banking and Brokerage Investments	15,174	US$229.6k	-83.3%	no data