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Merrimack Pharmaceuticals Inc (MACK)Ownership Data

Short Interest History (%)

This is the historical short interest of Merrimack Pharmaceuticals Inc, as measured by the Short Percentage Of Float.

Date Short Interest
March 31, 201519.48
March 13, 201523.25
February 27, 201521.81
February 13, 201520.91
January 30, 201520.29
January 15, 201520.71
December 31, 201419.92
December 15, 201421.76
November 28, 201422.1
November 14, 201423.55
October 31, 201423.38
October 15, 201423.83
September 30, 201423.4
September 15, 201422.68
August 29, 201421.21
August 15, 201421.37
July 31, 201422.43
July 15, 201421.25
June 30, 201422.57
June 13, 201425.88
May 30, 201429.67
May 15, 201428.65
April 30, 201428.96
April 15, 201428.69
March 31, 201428.46
March 14, 201428.35
February 28, 201427.9
February 14, 201426.89
January 31, 201425.06
January 15, 201425.76
December 31, 201325.15
December 13, 201322.51
November 29, 201318.42
November 15, 201317.92
October 31, 201318.82
October 15, 201318.8
September 30, 201318.92
September 13, 201318.46
August 30, 201317.26
August 15, 201316.27
July 31, 201313.61
July 15, 20138.59
June 28, 20134.95
June 14, 20134.14
May 31, 20133.72
May 15, 20133.66
April 30, 20133.37
April 15, 20133.63
March 28, 20133.5
March 15, 20133.29
February 28, 20133.52
February 15, 20133.53
January 31, 20134.25
January 15, 20134.45
December 31, 20124.64
December 14, 20124.94
November 30, 20124.66
November 15, 20124.23
October 31, 20123.9
October 15, 20123.86
September 28, 20123.61
September 14, 20122.85
August 31, 20122.4
August 15, 20122.3
July 31, 20122.12
July 13, 20122.08
June 29, 20121.96
June 15, 20121.3
May 31, 20121.08
May 15, 20120.33
April 30, 20120.01
April 13, 20120.01

Institutional Ownership History (%)

This the Institutional Ownership History of Merrimack Pharmaceuticals IncPeter Lynch prefers to buy companies with low institutional ownership.

Date Institutional Ownership
March 31, 201557
February 28, 201557
January 31, 201557
December 31, 201451
November 30, 201450
October 31, 201451
September 30, 201454
August 31, 201453
July 31, 201453
June 30, 201452
May 31, 201452
April 30, 201452
March 31, 201449
February 28, 201449
January 31, 201449
December 31, 201349
November 30, 201351
October 31, 201351
September 30, 201346
August 31, 201344
July 31, 201345
June 30, 201342
May 31, 201341
April 30, 201341
March 31, 201320
February 28, 201346
January 31, 201348
December 31, 201244
November 30, 201243
October 31, 201241
September 30, 201225
August 31, 201225
July 31, 201225
June 30, 20122
May 31, 20122
April 30, 20122
March 31, 20121

Insider ownership (%)

This is the historical insider ownership of Merrimack Pharmaceuticals Inc. It is usually better to buy companies with large insider ownership. The company insiders' interest are more aligned with external shareholders in this case.

Date Insider Ownership
March 31, 20157
February 28, 20157
January 31, 20157
December 31, 20145
November 30, 20147
October 31, 20147
September 30, 20147
August 31, 20147
July 31, 20147
June 30, 20147
May 31, 20147

Top Direct Holders

HolderPositionShares% of Shares
Outstanding
Report Date
Mr. Gary L. CrockerDirector2,808,5712.63%2014-05-20
Robert J. MulroyPresident and CEO1,683,3281.57%2015-03-23
Sarah E. NashDirector955,2960.89%2014-04-17
Dr. Michael E. PorterDirector653,1640.61%2015-03-24
Dr. Anthony J. Sinskey,Sc.D.Director422,5430.4%2014-12-18
Robert C. GayN/A318,1730.3%2012-04-03
Ulrik B. NielsenDirector226,8110.21%2015-03-19
Mr. Gordon J. FehrDirector215,1430.2%2014-05-12
Mr. James van B. DresserN/A168,9740.16%2014-06-02
Clet M. NiyikizaN/A141,5070.13%2013-02-05

Top Fund Holders

HolderSharesReport Date% of Shares
Outstanding
% of Total
Assets Managed
Market Value
Fidelity Management and Research Company15,816,3202014-12-3114.820.03178,724,000
Fidelity® Growth Company Fund8,308,8912015-02-287.770.2089,071,312
Vanguard Group, Inc.6,616,4292014-12-316.200.0174,765,000
BlackRock Fund Advisors4,745,6672014-12-314.450.0153,626,000
State Street Corp3,208,4062014-12-313.010.0036,260,000
Sanofi3,074,7182015-02-052.880.0028,994,591
Fidelity® Series Growth Company Fund2,427,6002015-02-282.270.2326,023,872
SPDR® S&P Biotech ETF1,900,4062015-04-101.821.0423,127,941
Deutsche Bank AG1,890,2592014-12-311.770.0321,359,000
Millennium Management LLC1,797,8482014-12-311.690.0420,316,000

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