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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
January 29, 201623.4
January 15, 201623.74
December 31, 201523.39
December 15, 201524.59
November 30, 201524.84
November 13, 201524.45
October 30, 201524.52
October 15, 201525.54
September 30, 201524.24
September 15, 201523.28
August 31, 201522.6
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
December 31, 201585.47
September 30, 201576.62
June 30, 201568.6
March 31, 201566.09
December 31, 201453.9
September 30, 201450.82
June 30, 201454.03
March 31, 201451.78
December 31, 201350.62
September 30, 201352.27
June 30, 201347.91
March 31, 201342.88
December 31, 201244.95
September 30, 201241.2
June 30, 201225.18
March 31, 201214.29

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
January 31, 20167.06
December 31, 20156.44
November 30, 20157.06
October 31, 20157.33
September 30, 20157.33
August 31, 20157.42
July 31, 20157.29
June 30, 20157.29
May 31, 20157.23
April 30, 20157.22
March 31, 20157.3
February 28, 20156.97
January 31, 20157.03
December 31, 20144.77
November 30, 20147.01
October 31, 20146.95
September 30, 20146.95
August 31, 20146.95
July 31, 20146.66
June 30, 20146.66
May 31, 20146.63

Top Direct Holders

HolderPositionShares% of Shares
Outstanding
Report Date
Mr. Gary L. CrockerDirector2,943,9612.55%2015-04-02
Robert J. MulroyPresident and CEO1,683,3281.46%2015-03-23
Sarah E. NashDirector955,2960.83%2014-04-17
Dr. Michael E. PorterDirector699,4480.61%2015-08-21
Dr. Anthony J. Sinskey,Sc.D.Director422,5430.37%2014-12-18
Robert C. GayN/A318,1730.28%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/A141,5070.12%2013-02-05

Top Fund Holders

HolderSharesReport Date% of Shares
Outstanding
% of Total
Assets Managed
Market Value($1000)
Fidelity Management and Research Company   Premium Plus16,646,5692015-09-3016.740.02163,969
Vanguard Group Inc   Premium Plus9,766,6322015-09-309.820.0196,201
BlackRock Advisors LLC   Premium Plus8,823,2272015-12-317.63N/A69,703
Fidelity® Growth Company Fund8,052,0212015-12-316.970.1663,611
Westfield Capital Management Company, LP   Premium Plus6,511,5612015-09-306.550.4464,139
BlackRock Fund Advisors   Premium Plus5,221,7832015-09-305.250.0151,435
TIAA-CREF Investment Management LLC   Premium Plus4,564,6032015-09-304.590.0444,961
CREF Stock Account4,449,8972015-11-303.850.0441,874
State Street Corp   Premium Plus4,044,0842015-09-304.07N/A39,834
Sanofi3,074,7182015-02-052.88N/A28,995

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