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Achillion Pharmaceuticals Inc (ACHN)Ownership Data

Short Interest History (%)

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

Date Short Interest
April 15, 201513.29
March 31, 201513.61
March 13, 201514.15
February 27, 201514.66
February 13, 201514.79
January 30, 201527.28
January 15, 201529.97
December 31, 201428.88
December 15, 201427.6
November 28, 201424.74
November 14, 201428.83
October 31, 201424.14
October 15, 201424.3
September 30, 201426.12
September 15, 201431.51
August 29, 201430.51
August 15, 201427.23
July 31, 201427.81
July 15, 201426.8
June 30, 201427.14
June 13, 201438.76
May 30, 201435.19
May 15, 201435.31
April 30, 201434.38
April 15, 201434.45
March 31, 201431.58
March 14, 201431.46
February 28, 201429.56
February 14, 201429.14
January 31, 201429.64
January 15, 201426.85
December 31, 201327.76
December 13, 201326.81
November 29, 201327.83
November 15, 201328.64
October 31, 201330.6
October 15, 201330.16
September 30, 201325.82
September 13, 201324.24
August 30, 201323.99
August 15, 201323.35
July 31, 201322.87
July 15, 201323.59
June 28, 201321.43
June 14, 201320.31
May 31, 201320.58
May 15, 201321.18
April 30, 201320.93
April 15, 201320.33
March 28, 201319.77
March 15, 201320.14
February 28, 201320.12
February 15, 201320.59
January 31, 201320.39
January 15, 201330.3
December 31, 201230.18
December 14, 201228.41
November 30, 201227.92
November 15, 201227.22
October 31, 201225.98
October 15, 201227.07
September 28, 201226.79
September 14, 201227.13
August 31, 201226.96
August 15, 201227.12
July 31, 201225.72
July 13, 201225
June 29, 201224.85
June 15, 201225.25
May 31, 201224.53
May 15, 201223.12
April 30, 201221.69
April 13, 201221.25
March 30, 201219.77
March 15, 201218.9
February 29, 201216.71
February 15, 201217.01
January 31, 201216.39
January 13, 201216.86
December 30, 201114.77
December 15, 201113.82
November 30, 201112.93
November 15, 201112.8
October 31, 201112.87
October 14, 201113.84
September 30, 201114.22
September 15, 201114.35
August 31, 201111.66
August 15, 201110.77
July 29, 20118.47
July 15, 20118.91
June 30, 20119.34
June 15, 20116.38
May 31, 20114.03
May 13, 20112.61
April 29, 20113.88
April 15, 20113.48
March 31, 20110.47
March 15, 20110.56
February 28, 20110.52
February 15, 20110.48
January 31, 20110.59
January 14, 20110.71
December 31, 20100.72
December 15, 20100.71
November 30, 20100.75
November 15, 20100.71
October 29, 20100.69
October 15, 20101.27
September 30, 20101.49
September 15, 20101.31
August 31, 20101.44
August 13, 20100.82
July 30, 20100.65
July 15, 20100.52
June 30, 20100.66
June 15, 20100.61
May 28, 20100.66
May 14, 20100.66
April 30, 20100.74
April 15, 20100.72
March 31, 20100.52
March 15, 20100.34
February 26, 20100.55
February 12, 20100.59
January 29, 20108.35
January 15, 20104.4
December 31, 20092.98
December 15, 20090.28
November 30, 20090.21
November 13, 20090.21
October 30, 20090.21
October 15, 20090.21
September 30, 20090.22
September 15, 20090.25
August 31, 20090.23
August 14, 20090.26
July 31, 20090.24
July 15, 20090.24
June 30, 20090.25
June 15, 20090.25
May 29, 20090.23
May 15, 20090.24
April 30, 20090.23
April 15, 20090.23
March 31, 20090.23
March 13, 20090.41
February 27, 20090.53
February 13, 20090.48
January 30, 20090.52
January 15, 20090.56
December 31, 20080.57
December 15, 20080.57
November 28, 20080.68
November 14, 20080.68
October 31, 20080.69
October 15, 20080.7
September 30, 20080.3
September 15, 20080.28
August 29, 20080.3
August 15, 20080.3
July 31, 20080.5
July 15, 20080.49
June 30, 20080.53
June 13, 20080.51
May 30, 20080.52
May 15, 20080.55
April 30, 20080.54
April 15, 20080.54
March 31, 20080.53
March 14, 20080.54
February 29, 20080.58
February 15, 20080.56
January 31, 20080.19
January 15, 20080.16
December 31, 20070.16
December 11, 20070.15
November 27, 20070.15
November 9, 20070.17
October 26, 20070.25
October 10, 20070.16
September 25, 20070.16
September 11, 20070.59
August 10, 20070.2
July 10, 20070.58
June 12, 20070.37
May 10, 20070.23
April 10, 20070.14
March 12, 20070.34
February 12, 20070.59
January 9, 20070.1
December 12, 20060.1

Institutional Ownership History (%)

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

Date Institutional Ownership
March 31, 201580
February 28, 201591
January 31, 201594
December 31, 201494
November 30, 201490
October 31, 201493
September 30, 201491
August 31, 201486
July 31, 201489
June 30, 201498
May 31, 201498
April 30, 201499
March 31, 201489
February 28, 201496
January 31, 201490
December 31, 201395
November 30, 201395
August 31, 201396
July 31, 201396
May 31, 201398
April 30, 201398
March 31, 201327
December 31, 201299
September 30, 201295
August 31, 201295
July 31, 201295
June 30, 201287
May 31, 201288
April 30, 201288
March 31, 201271
February 29, 201275
January 31, 201274
December 31, 201166
November 30, 201166
October 31, 201166
September 30, 201195
August 31, 201196
July 31, 201183
June 30, 201190
May 31, 201191
April 30, 201192
March 31, 201175
February 28, 201175
January 31, 201174
December 31, 201076
November 30, 201075
July 31, 201045
June 30, 201046
May 31, 201047
April 30, 201028
March 31, 201025
February 28, 201040
January 31, 201024
December 31, 200921
November 30, 200921
October 31, 200920
September 30, 200934
August 31, 200934
July 31, 200934
June 30, 200931
May 31, 200931
April 30, 200930
March 31, 200931
February 28, 200931
January 31, 200929
December 31, 200829
November 30, 200828
October 31, 200827
September 30, 200819
August 31, 200819
July 31, 200819
June 30, 200834
May 31, 200834
April 30, 200834
March 31, 200834
February 29, 200834
January 31, 200834

Insider ownership (%)

This is the historical insider ownership of Achillion 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
April 30, 200812
March 31, 200812
February 29, 200812
January 31, 200812
December 31, 200712
November 30, 200712
October 31, 200712
September 30, 200712
August 31, 200712
July 31, 200712
June 30, 200712
May 31, 200712
April 30, 200712
March 31, 200715
February 28, 200715
January 31, 200715
December 31, 200615
November 30, 200615
October 31, 200615
September 30, 200616

Top Direct Holders

HolderPositionShares% of Shares
Outstanding
Report Date
Dr. Dennis LiottaDirector100,000less than 0.1%2013-11-22
Nicholas J. Simon,IIIN/A51,515less than 0.1%2012-06-04
Dr. Jason S. Fisherman,M.D.Director40,000less than 0.1%2013-11-18
Kurt C. GravesDirector22,709less than 0.1%2012-06-11
Dr. John C. Pottage,Jr,M.D.SVP and Chief Medical Officer12,500less than 0.1%2006-10-25
Mr. Gary E. FrashierDirector5,000less than 0.1%2014-06-16
Gautam Shah,PhDEVP and Chief Compliance Ofc.3,125less than 0.1%2012-12-31
Mr. Christopher A. WhiteN/A2,242less than 0.1%2006-10-31
Dr. Elizabeth A. Olek, D.O.SVP and CMO2,000less than 0.1%2012-01-10

Top Fund Holders

HolderSharesReport Date% of Shares
Outstanding
% of Total
Assets Managed
Market Value
Fidelity Management and Research Company10,833,8162014-12-3110.460.02132,714,000
Fidelity® Select Biotechnology Portfolio7,229,8002015-02-286.980.6687,769,772
RA Capital Management, LLC6,700,0002014-12-316.478.6982,075,000
Vanguard Group, Inc.5,486,0212014-12-315.300.0067,204,000
Domain Partners VIII, LP4,572,9682014-09-094.680.0052,909,240
BlackRock Fund Advisors3,851,2542014-12-313.720.0147,178,000
Goldman, Sachs & Co.3,444,1122014-12-313.320.0242,190,000
Janus Capital Management LLC3,103,3692014-12-313.000.0538,016,000
Brookside Capital Management LLC2,928,7502014-12-312.830.9035,877,000
Deerfield Management Co2,920,3002014-12-312.821.2935,774,000

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