Renaissance Technologies - MERRIMACK PHARMACEUTICALS IN ownership

MERRIMACK PHARMACEUTICALS IN's ticker is MACKXXXX and the CUSIP is 590328100. A total of 153 filers reported holding MERRIMACK PHARMACEUTICALS IN in Q1 2015. The put-call ratio across all filers is 0.37 and the average weighting 0.1%.

Quarter-by-quarter ownership
Renaissance Technologies ownership history of MERRIMACK PHARMACEUTICALS IN
ValueSharesWeighting
Q2 2016$4,015,000
-24.6%
744,813
+17.0%
0.01%
-20.0%
Q1 2016$5,328,000
+2413.2%
636,613
+3620.1%
0.01%
Q2 2015$212,000
-92.7%
17,113
-93.3%
0.00%
-100.0%
Q4 2014$2,886,000
+2.3%
255,413
-20.5%
0.01%
-12.5%
Q3 2014$2,820,000
-32.1%
321,213
-43.6%
0.01%
-20.0%
Q2 2014$4,151,000569,4130.01%
Other shareholders
MERRIMACK PHARMACEUTICALS IN shareholders Q1 2015
NameSharesValueWeighting ↓
Lagoda Investment Management, L.P. 2,100,140$25,968,0006.81%
Portolan Capital Management 664,298$8,214,0001.15%
GARRISON BRADFORD & ASSOCIATES INC 90,700$1,122,0001.10%
Opus Point Partners Management, LLC 72,009$890,0000.70%
Eagle Ridge Investment Management 122,500$1,515,0000.68%
EAM Investors, LLC 350,410$4,333,0000.51%
WESTFIELD CAPITAL MANAGEMENT CO LP 4,881,667$60,362,0000.37%
Cannell & Co. 1,051,178$12,998,0000.37%
Birchview Capital, LP 42,300$523,0000.28%
Tekla Capital Management LLC 567,787$7,021,0000.25%
View complete list of MERRIMACK PHARMACEUTICALS IN shareholders