GROUP ONE TRADING, L.P. - MERRIMACK PHARMACEUTICALS IN ownership

MERRIMACK PHARMACEUTICALS IN's ticker is and the CUSIP is 590328900. A total of 2 filers reported holding MERRIMACK PHARMACEUTICALS IN in Q3 2013. The put-call ratio across all filers is - and the average weighting 0.0%.

Quarter-by-quarter ownership
GROUP ONE TRADING, L.P. ownership history of MERRIMACK PHARMACEUTICALS IN
ValueSharesWeighting
Q2 2017$24,000
-80.0%
19,600
-49.9%
0.00%
-100.0%
Q1 2017$120,000
+46.3%
39,100
+94.5%
0.00%0.0%
Q4 2016$82,000
+8100.0%
20,100
+20000.0%
0.00%
Q3 2016$1,000
-98.1%
100
-99.0%
0.00%
-100.0%
Q2 2016$52,000
-94.1%
9,600
-90.8%
0.00%
-91.7%
Q1 2016$878,000
+180.5%
104,900
+164.9%
0.01%
+200.0%
Q4 2015$313,000
-66.9%
39,600
-64.4%
0.00%
-69.2%
Q3 2015$947,000
-33.2%
111,300
-3.0%
0.01%
-35.0%
Q2 2015$1,418,000
+35.4%
114,700
+30.2%
0.02%
+25.0%
Q1 2015$1,047,000
+82.4%
88,100
+73.4%
0.02%
+77.8%
Q4 2014$574,000
-66.8%
50,800
-74.2%
0.01%
-66.7%
Q3 2014$1,727,000
-13.8%
196,700
-28.4%
0.03%
-12.9%
Q2 2014$2,003,000
+1826.0%
274,800
+1234.0%
0.03%
+1450.0%
Q1 2014$104,000
-46.4%
20,600
-43.4%
0.00%
-33.3%
Q4 2013$194,000
+506.2%
36,400
+338.6%
0.00%
+200.0%
Q3 2013$32,000
-86.4%
8,300
-76.2%
0.00%
-83.3%
Q2 2013$235,00034,9000.01%
Other shareholders
MERRIMACK PHARMACEUTICALS IN shareholders Q3 2013
NameSharesValueWeighting ↓
GROUP ONE TRADING, L.P. 104,900$878,0000.01%
SIMPLEX TRADING, LLC 263$13,0000.00%
Citadel Advisors 45,000$377,0000.00%
View complete list of MERRIMACK PHARMACEUTICALS IN shareholders