Merrimack Pharmaceuticals, Inc.

NasdaqGM:MACK Stock Report

Market Cap: US$217.7m

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
DateValueNameEntityRoleSharesMax Price
28 Dec 23BuyUS$651,754Western Standard, LLCCompany49,550US$13.35
07 Dec 23BuyUS$1,298,472Western Standard, LLCCompany101,050US$12.85
17 Nov 23BuyUS$3,750Western Standard, LLCCompany300US$12.50
14 Nov 23BuyUS$627,125Western Standard, LLCCompany50,170US$12.50
13 Nov 23BuyUS$661,883Western Standard, LLCCompany53,632US$12.39
09 Nov 23BuyUS$289,319Western Standard, LLCCompany23,798US$12.19
10 Aug 23BuyUS$25,039Gary CrockerIndividual2,000US$12.52
08 Aug 23BuyUS$2,658,741Western Standard, LLCCompany221,550US$12.00

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 TypeNumber of SharesOwnership Percentage
Private Companies1,2660.00871%
Individual Insiders176,1591.21%
Institutions4,621,46231.8%
General Public4,784,31632.9%
Hedge Funds4,948,55734.1%

Dilution of Shares: Shareholders have not been meaningfully diluted in the past year.

Top Shareholders

Top 25 shareholders own 65.63% of the company
OwnershipNameSharesCurrent ValueChange %Portfolio %
15%
Western Standard, LLC
2,172,513US$32.5m14.7%28.99%
12.9%
Newtyn Management, LLC
1,873,694US$28.1m0%3.59%
6.21%
ADAR1 Capital Management, LLC
902,350US$13.5m64.2%5.41%
4.92%
BlackRock, Inc.
715,279US$10.7m-3.81%no data
4.19%
The Vanguard Group, Inc.
608,954US$9.1m1.43%no data
3.81%
Madison Avenue Partners, LP
553,085US$8.3m0%1.12%
3%
Dimensional Fund Advisors LP
435,645US$6.5m-2.92%no data
2.11%
Sepio Capital, LP
306,680US$4.6m0%0.36%
1.99%
Sio Capital Management, LLC
288,466US$4.3m0%1.69%
1.79%
Geode Capital Management, LLC
259,946US$3.9m3.32%no data
1.54%
Indaba Capital Management, L.P.
223,459US$3.3m63.3%3.62%
1.45%
Wittenberg Investment Management Inc
210,239US$3.1m0.24%1.02%
1.35%
State Street Global Advisors, Inc.
196,705US$2.9m2.53%no data
0.93%
Gary Crocker
135,105US$2.0m1.5%no data
0.8%
Northern Trust Global Investments
116,909US$1.8m1.33%no data
0.65%
BNY Mellon Asset Management
94,895US$1.4m-5.29%no data
0.63%
Morgan Stanley, Investment Banking and Brokerage Investments
91,155US$1.4m20.5%no data
0.55%
Susquehanna International Group, LLP, Asset Management Arm
80,641US$1.2m-48.5%no data
0.37%
Yakira Capital Management, Inc.
54,118US$810.7k0%0.34%
0.34%
Renaissance Technologies LLC
48,900US$732.5k0%no data
0.32%
Kennedy Capital Management LLC
46,202US$692.1k-50.7%0.01%
0.25%
Ulrik Nielsen
36,898US$552.7k-70%no data
0.24%
Bridgeway Capital Management, LLC
34,200US$512.3k0%0.01%
0.2%
Charles Schwab Investment Management, Inc.
29,628US$443.8k0%no data
0.15%
Two Sigma Investments, LP
21,834US$327.1k0%no data
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