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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
August 14, 201522.56
July 31, 201524.38
July 15, 201524.04
June 30, 201524.12
June 15, 201524.11
May 29, 201521.96
May 15, 201522.14
April 30, 201519.76
April 15, 201519.18
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
June 30, 201572
March 31, 201566
December 31, 201454
September 30, 201451
June 30, 201453
March 31, 201452
December 31, 201350
September 30, 201351
June 30, 201347
March 31, 201342
December 31, 201244
September 30, 201241
June 30, 201225
March 31, 201214

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
July 31, 20157
June 30, 20157
May 31, 20157
April 30, 20157
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. CrockerDirector2,943,9612.64%2015-04-02
Robert J. MulroyPresident and CEO1,683,3281.51%2015-03-23
Sarah E. NashDirector955,2960.86%2014-04-17
Dr. Michael E. PorterDirector699,4480.63%2015-08-21
Dr. Anthony J. Sinskey,Sc.D.Director422,5430.38%2014-12-18
Robert C. GayN/A318,1730.29%2012-04-03
Ulrik B. NielsenDirector226,8110.2%2015-07-20
Mr. Gordon J. FehrDirector215,1430.19%2015-04-13
Mr. James van B. DresserN/A168,9740.15%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($1000)
Fidelity Management and Research Company   Premium Plus16,437,3502015-06-3014.940.03203,248
Vanguard Group, Inc.   Premium Plus9,379,2872015-06-308.520.01115,975
Fidelity® Growth Company Fund8,454,2212015-06-307.680.25104,536
BlackRock Fund Advisors   Premium Plus5,235,9042015-06-304.760.0264,742
Westfield Capital Management Company, LP   Premium Plus4,881,6672015-06-304.440.3760,362
State Street Corp   Premium Plus3,985,1092015-06-303.620.0149,277
TIAA-CREF Investment Management LLC   Premium Plus3,103,3202015-06-302.820.0338,373
Sanofi3,074,7182015-02-052.88N/A28,995
Fidelity® Series Growth Company Fund2,427,6002015-06-302.210.2730,017
CREF Stock Account2,413,8152015-06-302.190.0229,847

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