Insider Trading activities of Merrimack Pharmaceuticals Inc (MACK)

Insider trading activities (stock purchases, sales, and option exercises) reported by insiders of Merrimack Pharmaceuticals Inc (MACK) since 2005 are illustrated in Table 1 and Table 2. Table 1 shows the monthly insider trading data of Merrimack Pharmaceuticals Inc since year 2005. Table 2 shows the detailed insider transactions of Merrimack Pharmaceuticals Inc since 2005. The reporting company's ticker symbol is MACK. The reporting company's CIK number is 1274792.
The total value of stock buying since 2005 is $10,144,696.
The total value of stock sales since 2005 is $14,967,722.
The total value of stock option exercises since 2005 is $6,016,227.


Table 1. Monthly summaries of insider stock purchases, sales, and option exercises for Merrimack Pharmaceuticals Inc (MACK).
Trading Period Insider Buying Insider Sales Option Exercises
year-month Shares Value Shares Value Shares Value
2019-07 30,526 $179,242 0 $0 0 $0
2019-06 23,564 $140,087 0 $0 0 $0
2019-04 186,911 $1,107,486 0 $0 0 $0
2017-09 0 $0 29,452 $422,764 29,452 $388,766
2017-05 0 $0 4,097 $15,240 4,097 $11,020
2017-03 0 $0 0 $0 85,000 $228,650
2016-07 0 $0 50,000 $275,000 80,000 $180,100
2016-03 45,000 $306,999 0 $0 0 $0
2016-02 12,000 $67,540 0 $0 0 $0
2016-01 0 $0 4,000 $32,000 4,000 $7,240
2015-12 0 $0 5,000 $46,650 5,000 $9,050
2015-11 0 $0 6,000 $57,900 6,000 $10,860
2015-10 0 $0 6,000 $51,000 6,000 $10,860
2015-09 0 $0 6,000 $59,280 6,000 $10,860
2015-08 148,000 $1,504,540 6,000 $62,940 6,000 $10,860
2015-07 0 $0 41,000 $462,990 41,000 $94,460
2015-06 0 $0 63,000 $728,570 125,057 $279,039
2015-05 8,284 $97,668 63,000 $805,789 63,000 $145,080
2015-04 0 $0 83,000 $1,070,570 168,000 $328,530
2015-03 21,190 $242,656 267,987 $3,191,791 611,999 $1,285,992
2015-02 0 $0 176,000 $1,921,060 176,000 $301,560
2015-01 0 $0 6,000 $67,140 6,000 $10,860
2014-12 28,000 $274,280 244,000 $2,427,480 337,247 $461,690
2014-11 71,299 $603,816 5,000 $42,760 5,000 $8,550
2014-10 0 $0 7,000 $59,150 7,000 $11,970
2014-09 0 $0 117,282 $1,005,082 117,282 $267,017
2014-08 0 $0 24,000 $164,880 399,000 $498,750
2014-06 68,390 $467,787 0 $0 25,000 $31,250
2014-05 135,300 $896,673 121,000 $969,050 201,000 $291,560
2014-03 0 $0 0 $0 50,000 $62,500
2013-12 243,600 $1,063,575 0 $0 11,000 $19,910
2013-11 292,800 $1,079,935 0 $0 0 $0
2013-05 0 $0 0 $0 50,000 $109,500
2013-04 0 $0 25,483 $147,211 60,483 $132,457
2013-02 0 $0 0 $0 41,507 $87,994
2012-12 51,500 $341,159 125,000 $881,425 165,000 $330,350
2012-09 64,800 $539,719 0 $0 0 $0
2012-08 12,500 $94,062 0 $0 20,000 $43,800
2012-07 0 $0 0 $0 44,368 $97,165
2012-06 0 $0 0 $0 75,000 $164,250
2012-04 162,496 $1,137,472 0 $0 38,233 $83,727

Table 2. Detailed insider stock purchases, sales, and option exercises of Merrimack Pharmaceuticals Inc insiders (MACK)
  Trade Date   Insider Name Trade Type     Shares       Price ($)   Value ($)
2019-07-16 Aryeh Jason Buy 302 5.44 1,642
2019-07-12 Aryeh Jason Buy 3,400 5.67 19,261
2019-07-11 Aryeh Jason Buy 100 5.71 571
2019-07-02 Lawler Joseph F. Buy 17,131 5.85 100,182
2019-07-01 Lawler Joseph F. Buy 9,593 6.00 57,586
2019-06-28 Lawler Joseph F. Buy 23,564 5.95 140,087
2019-04-17 English Aron R. Buy 16,200 6.00 97,151
2019-04-16 English Aron R. Buy 20,450 5.95 121,636
2019-04-15 English Aron R. Buy 30,110 5.73 172,530
2019-04-08 English Aron R. Buy 32,873 5.81 191,025
2019-04-08 Lawler Joseph F. Buy 10,990 5.73 62,928
2019-04-05 English Aron R. Buy 50,000 6.12 305,750
2019-04-05 Lawler Joseph F. Buy 26,288 5.95 156,466
2017-09-15 Nielsen Ulrik B. (Director) Sale 7,796 14.23 110,937
2017-09-15 Nielsen Ulrik B. (Director) Option Ex 7,796 13.20 102,907
2017-09-14 Nielsen Ulrik B. (Director) Sale 100 14.20 1,420
2017-09-14 Nielsen Ulrik B. (Director) Option Ex 100 13.20 1,320
2017-09-13 Nielsen Ulrik B. (Director) Sale 6,800 14.27 97,036
2017-09-13 Nielsen Ulrik B. (Director) Option Ex 6,800 13.20 89,760
2017-09-11 Nielsen Ulrik B. (Director) Sale 14,756 14.46 213,371
2017-09-11 Nielsen Ulrik B. (Director) Option Ex 14,756 13.20 194,779
2017-05-12 Drummond Daryl C (Head of Research) Sale 4,097 3.72 15,240
2017-05-12 Drummond Daryl C (Head of Research) Option Ex 4,097 2.69 11,020
2017-03-10 Porter Michael E (Director) Option Ex 85,000 2.69 228,650
2016-07-26 Stewart Edward J. (Head of Commercial) Option Ex 30,000 2.47 74,100
2016-07-25 Schoeberl Birgit M. (Head of Discovery) Sale 50,000 5.50 275,000
2016-07-25 Schoeberl Birgit M. (Head of Discovery) Option Ex 50,000 2.12 106,000
2016-03-17 Porter Michael E (Director) Buy 5,000 7.20 36,000
2016-03-15 Porter Michael E (Director) Buy 5,000 7.65 38,250
2016-03-08 Porter Michael E (Director) Buy 10,000 7.09 70,900
2016-03-03 Porter Michael E (Director) Buy 10,000 6.27 62,699
2016-03-02 Porter Michael E (Director) Buy 5,000 6.63 33,150
2016-03-01 Porter Michael E (Director) Buy 10,000 6.60 66,000
2016-02-29 Mcclements William M. (Head of Corporate Operations) Buy 2,000 5.72 11,440
2016-02-29 Porter Michael E (Director) Buy 10,000 5.61 56,100
2016-01-05 Stewart Edward J. (Head of Commercial) Sale 4,000 8.00 32,000
2016-01-05 Stewart Edward J. (Head of Commercial) Option Ex 4,000 1.81 7,240
2015-12-01 Stewart Edward J. (Head of Commercial) Sale 5,000 9.33 46,650
2015-12-01 Stewart Edward J. (Head of Commercial) Option Ex 5,000 1.81 9,050
2015-11-02 Stewart Edward J. (Head of Commercial) Sale 6,000 9.65 57,900
2015-11-02 Stewart Edward J. (Head of Commercial) Option Ex 6,000 1.81 10,860
2015-10-16 Stewart Edward J. (Head of Commercial) Sale 1,000 10.00 10,000
2015-10-16 Stewart Edward J. (Head of Commercial) Option Ex 1,000 1.81 1,810
2015-10-02 Stewart Edward J. (Head of Commercial) Sale 1,000 9.00 9,000
2015-10-02 Stewart Edward J. (Head of Commercial) Option Ex 1,000 1.81 1,810
2015-10-01 Stewart Edward J. (Head of Commercial) Sale 4,000 8.00 32,000
2015-10-01 Stewart Edward J. (Head of Commercial) Option Ex 4,000 1.81 7,240
2015-09-01 Stewart Edward J. (Head of Commercial) Sale 6,000 9.88 59,280
2015-09-01 Stewart Edward J. (Head of Commercial) Option Ex 6,000 1.81 10,860
2015-08-21 Porter Michael E (Director) Buy 5,000 9.76 48,800
2015-08-17 Stewart Edward J. (Head of Commercial) Sale 6,000 10.49 62,940
2015-08-17 Stewart Edward J. (Head of Commercial) Option Ex 6,000 1.81 10,860
2015-08-14 Porter Michael E Buy 3,000 10.18 30,540
2015-08-13 Porter Michael E Buy 10,000 10.65 106,500
2015-08-12 Dineen John M. Buy 100,000 10.15 1,015,000
2015-08-12 Lee Vivian S Buy 10,000 10.05 100,500
2015-08-12 Porter Michael E Buy 20,000 10.16 203,200
2015-07-20 Nielsen Ulrik B. Sale 20,000 10.71 214,200
2015-07-20 Nielsen Ulrik B. Option Ex 20,000 2.59 51,800
2015-07-15 Stewart Edward J. (Head of Commercial) Sale 6,000 11.84 71,040
2015-07-15 Stewart Edward J. (Head of Commercial) Option Ex 6,000 1.81 10,860
2015-07-15 Sullivan William A. (CFO and Treasurer) Sale 15,000 11.85 177,750
2015-07-15 Sullivan William A. (CFO and Treasurer) Option Ex 15,000 2.12 31,800
2015-06-19 Nielsen Ulrik B. Sale 40,000 12.02 480,800
2015-06-19 Nielsen Ulrik B. Option Ex 40,000 2.53 101,199
2015-06-18 Stewart Edward J. (Head of Commercial) Sale 2,000 12.00 24,000
2015-06-18 Stewart Edward J. (Head of Commercial) Option Ex 2,000 1.81 3,620
2015-06-15 Stewart Edward J. (Head of Commercial) Sale 6,000 10.67 64,020
2015-06-15 Stewart Edward J. (Head of Commercial) Option Ex 6,000 1.81 10,860
2015-06-15 Sullivan William A. (CFO and Treasurer) Sale 15,000 10.65 159,750
2015-06-15 Sullivan William A. (CFO and Treasurer) Option Ex 15,000 2.12 31,800
2015-06-09 Schoeberl Birgit M. (Head of Discovery) Option Ex 62,057 2.12 131,560
2015-05-19 Nielsen Ulrik B. Sale 40,000 13.04 521,599
2015-05-19 Nielsen Ulrik B. Option Ex 40,000 2.47 98,800
2015-05-15 Stewart Edward J. (Head of Commercial) Sale 8,000 12.33 98,640
2015-05-15 Stewart Edward J. (Head of Commercial) Option Ex 8,000 1.81 14,480
2015-05-15 Sullivan William A. (CFO and Treasurer) Sale 15,000 12.37 185,550
2015-05-15 Sullivan William A. (CFO and Treasurer) Option Ex 15,000 2.12 31,800
2015-05-13 Porter Michael E Buy 8,284 11.79 97,668
2015-04-20 Nielsen Ulrik B. Sale 40,000 12.88 515,200
2015-04-20 Nielsen Ulrik B. Option Ex 40,000 1.76 70,400
2015-04-15 Stewart Edward J. (SVP & Pres, Healthcare Sol) Sale 8,000 12.79 102,320
2015-04-15 Stewart Edward J. (SVP & Pres, Healthcare Sol) Option Ex 8,000 1.81 14,480
2015-04-15 Sullivan William A. (CFO and Treasurer) Sale 15,000 12.87 193,050
2015-04-15 Sullivan William A. (CFO and Treasurer) Option Ex 15,000 2.12 31,800
2015-04-13 Fehr Gordon J. Sale 20,000 13.00 260,000
2015-04-13 Fehr Gordon J. Option Ex 20,000 1.71 34,200
2015-04-02 Crocker Gary L Option Ex 85,000 2.09 177,650
2015-03-24 Mulroy Robert J. (President and CEO) Sale 103,968 11.71 1,217,465
2015-03-24 Mulroy Robert J. (President and CEO) Option Ex 447,980 2.22 995,859
2015-03-24 Porter Michael E Buy 5,000 11.70 58,500
2015-03-23 Mulroy Robert J. (President and CEO) Sale 10,400 11.69 121,576
2015-03-23 Mulroy Robert J. (President and CEO) Option Ex 10,400 1.71 17,784
2015-03-20 Porter Michael E Buy 5,000 11.77 58,850
2015-03-19 Nielsen Ulrik B. Sale 40,000 11.97 478,800
2015-03-19 Nielsen Ulrik B. Option Ex 40,000 1.71 68,400
2015-03-19 Sullivan William A. (CFO and Treasurer) Sale 15,000 11.97 179,550
2015-03-19 Sullivan William A. (CFO and Treasurer) Option Ex 15,000 2.12 31,800
2015-03-17 Schoeberl Birgit M. (Head of Discovery) Sale 21,337 12.00 256,044
2015-03-17 Schoeberl Birgit M. (Head of Discovery) Option Ex 21,337 1.76 37,553
2015-03-17 Stewart Edward J. (SVP & Pres, Healthcare Sol) Sale 2,000 12.00 24,000
2015-03-17 Stewart Edward J. (SVP & Pres, Healthcare Sol) Option Ex 2,000 1.81 3,620
2015-03-17 Porter Michael E Buy 1,190 11.77 14,006
2015-03-16 Schoeberl Birgit M. (Head of Discovery) Sale 20,897 12.00 250,764
2015-03-16 Schoeberl Birgit M. (Head of Discovery) Option Ex 20,897 1.76 36,778
2015-03-16 Stewart Edward J. (SVP & Pres, Healthcare Sol) Sale 6,000 11.93 71,580
2015-03-16 Stewart Edward J. (SVP & Pres, Healthcare Sol) Option Ex 6,000 1.81 10,860
2015-03-11 Porter Michael E Buy 5,000 11.33 56,650
2015-03-05 Mulroy Robert J. (President and CEO) Sale 22,385 12.50 279,812
2015-03-05 Mulroy Robert J. (President and CEO) Option Ex 22,385 1.71 38,278
2015-03-04 Nielsen Ulrik B. Sale 20,000 12.01 240,200
2015-03-04 Nielsen Ulrik B. Option Ex 20,000 1.71 34,200
2015-03-04 Stewart Edward J. (SVP & Pres, Healthcare Sol) Sale 6,000 12.00 72,000
2015-03-04 Stewart Edward J. (SVP & Pres, Healthcare Sol) Option Ex 6,000 1.81 10,860
2015-03-02 Porter Michael E Buy 5,000 10.93 54,650
2015-02-23 Nielsen Ulrik B. Sale 20,000 10.91 218,200
2015-02-23 Nielsen Ulrik B. Option Ex 20,000 1.71 34,200
2015-02-20 Mulroy Robert J. (President and CEO) Sale 150,000 10.94 1,641,000
2015-02-20 Mulroy Robert J. (President and CEO) Option Ex 150,000 1.71 256,500
2015-02-17 Stewart Edward J. (SVP & Pres, Healthcare Sol) Sale 6,000 10.31 61,860
2015-02-17 Stewart Edward J. (SVP & Pres, Healthcare Sol) Option Ex 6,000 1.81 10,860
2015-01-15 Stewart Edward J. (SVP & Pres, Healthcare Sol) Sale 6,000 11.19 67,140
2015-01-15 Stewart Edward J. (SVP & Pres, Healthcare Sol) Option Ex 6,000 1.81 10,860
2014-12-24 Sullivan William A. (CFO and Treasurer) Sale 15,000 10.70 160,500
2014-12-24 Sullivan William A. (CFO and Treasurer) Option Ex 15,000 1.81 27,150
2014-12-23 Lee Vivian S Buy 20,000 10.23 204,600
2014-12-18 Sinskey Anthony J Sale 20,000 10.31 206,200
2014-12-18 Sinskey Anthony J Option Ex 20,000 1.71 34,200
2014-12-15 Stewart Edward J. (SVP & Pres, Healthcare Sol) Sale 6,000 10.63 63,780
2014-12-15 Stewart Edward J. (SVP & Pres, Healthcare Sol) Option Ex 6,000 1.76 10,560
2014-12-08 Mulroy Robert J. (President and CEO) Sale 25,000 9.73 243,250
2014-12-08 Mulroy Robert J. (President and CEO) Option Ex 118,247 1.40 165,900
2014-12-05 Stewart Edward J. (SVP & Pres, Healthcare Sol) Sale 3,000 10.00 30,000
2014-12-05 Stewart Edward J. (SVP & Pres, Healthcare Sol) Option Ex 3,000 1.71 5,130
2014-12-05 Mulroy Robert J. (President and CEO) Sale 175,000 9.85 1,723,750
2014-12-05 Mulroy Robert J. (President and CEO) Option Ex 175,000 1.25 218,750
2014-12-02 Porter Michael E Buy 8,000 8.71 69,680
2014-11-21 Porter Michael E Buy 5,675 9.00 51,075
2014-11-20 Porter Michael E Buy 6,234 8.76 54,609
2014-11-18 Stewart Edward J. (SVP & Pres, Healthcare Sol) Sale 1,000 9.00 9,000
2014-11-18 Stewart Edward J. (SVP & Pres, Healthcare Sol) Option Ex 1,000 1.71 1,710
2014-11-17 Stewart Edward J. (SVP & Pres, Healthcare Sol) Sale 4,000 8.44 33,760
2014-11-17 Stewart Edward J. (SVP & Pres, Healthcare Sol) Option Ex 4,000 1.71 6,840
2014-11-14 Porter Michael E Buy 5,000 8.29 41,449
2014-11-13 Crocker Gary L Buy 8,630 8.37 72,233
2014-11-12 Porter Michael E Buy 40,000 8.37 334,799
2014-11-12 Crocker Gary L Buy 5,760 8.62 49,651
2014-10-23 Stewart Edward J. (SVP & Pres, Healthcare Sol) Sale 3,000 9.05 27,150
2014-10-23 Stewart Edward J. (SVP & Pres, Healthcare Sol) Option Ex 3,000 1.71 5,130
2014-10-15 Stewart Edward J. (SVP & Pres, Healthcare Sol) Sale 4,000 8.00 32,000
2014-10-15 Stewart Edward J. (SVP & Pres, Healthcare Sol) Option Ex 4,000 1.71 6,840
2014-09-30 Sullivan William A. (CFO and Treasurer) Sale 40,878 8.94 365,449
2014-09-30 Sullivan William A. (CFO and Treasurer) Option Ex 40,878 2.69 109,961
2014-09-29 Sullivan William A. (CFO and Treasurer) Sale 64,404 8.40 540,993
2014-09-29 Sullivan William A. (CFO and Treasurer) Option Ex 64,404 2.12 136,536
2014-09-24 Stewart Edward J. (SVP & Pres, Healthcare Sol) Sale 12,000 8.22 98,640
2014-09-24 Stewart Edward J. (SVP & Pres, Healthcare Sol) Option Ex 12,000 1.71 20,520
2014-08-29 Mulroy Robert J. (President and CEO) Option Ex 19,832 1.25 24,790
2014-08-26 Nielsen Ulrik B. (SVP and CSO) Option Ex 50,000 1.25 62,500
2014-08-26 Stewart Edward J. (SVP & Pres, Healthcare Sol) Sale 24,000 6.87 164,880
2014-08-26 Stewart Edward J. (SVP & Pres, Healthcare Sol) Option Ex 24,000 1.25 30,000
2014-08-25 Sinskey Anthony J Option Ex 25,000 1.25 31,250
2014-08-21 Mulroy Robert J. (President and CEO) Option Ex 280,168 1.25 350,210
2014-06-23 Porter Michael E Buy 32,390 6.84 221,547
2014-06-23 Crocker Gary L Buy 36,000 6.84 246,240
2014-06-02 Dresser James Van B. Option Ex 25,000 1.25 31,250
2014-05-27 Nielsen Ulrik B. (SVP and CSO) Sale 105,000 8.01 841,050
2014-05-27 Nielsen Ulrik B. (SVP and CSO) Option Ex 105,000 1.48 155,400
2014-05-27 Stewart Edward J. (SVP & Pres, Healthcare Sol) Sale 16,000 8.00 128,000
2014-05-27 Stewart Edward J. (SVP & Pres, Healthcare Sol) Option Ex 16,000 1.25 20,000
2014-05-20 Crocker Gary L Buy 4,000 6.69 26,760
2014-05-19 Quigley James H. Buy 5,000 6.58 32,900
2014-05-19 Crocker Gary L Buy 6,000 6.71 40,260
2014-05-16 Porter Michael E Buy 5,000 6.50 32,500
2014-05-16 Crocker Gary L Buy 3,400 6.63 22,542
2014-05-14 Porter Michael E Buy 10,000 6.49 64,900
2014-05-13 Sinskey Anthony J Buy 5,000 6.74 33,700
2014-05-12 Fehr Gordon J. Option Ex 25,000 1.25 31,250
2014-05-08 Porter Michael E Buy 5,000 6.48 32,400
2014-05-08 Porter Michael E Option Ex 20,000 2.06 41,160
2014-05-07 Nash Sarah E Buy 15,000 6.79 101,850
2014-05-07 Porter Michael E Buy 5,000 6.70 33,500
2014-05-07 Crocker Gary L Buy 4,400 6.77 29,787
2014-05-06 Crocker Gary L Buy 7,500 6.85 51,375
2014-05-05 Mulroy Robert J. (President and CEO) Buy 5,000 6.31 31,549
2014-05-05 Porter Michael E Buy 20,000 6.27 126,750
2014-05-05 Crocker Gary L Buy 20,000 6.80 136,100
2014-05-05 Crocker Gary L Option Ex 35,000 1.25 43,750
2014-03-12 Crocker Gary L Option Ex 50,000 1.25 62,500
2013-12-31 Sullivan William A. (CFO and Treasurer) Option Ex 11,000 1.81 19,910
2013-12-17 Porter Michael E Buy 12,500 4.79 59,937
2013-12-16 Porter Michael E Buy 12,500 4.71 58,875
2013-12-12 Mcclements William M. (SVP of Corporate Operations) Buy 2,500 4.39 10,980
2013-12-11 Mcclements William M. (SVP of Corporate Operations) Buy 1,500 4.05 6,077
2013-12-10 Porter Michael E Buy 18,000 4.38 78,840
2013-12-06 Quigley James H. Buy 39,000 4.70 183,261
2013-12-04 Mulroy Robert J. (President and CEO) Buy 33,100 4.42 146,235
2013-12-03 Nash Sarah E Buy 500 4.35 2,175
2013-12-03 Porter Michael E Buy 5,000 4.25 21,255
2013-12-02 Mcclements William M. (SVP of Corporate Operations) Buy 2,000 4.06 8,119
2013-12-02 Nash Sarah E Buy 47,000 4.17 196,131
2013-12-02 Porter Michael E Buy 70,000 4.17 291,690
2013-11-29 Mcclements William M. (SVP of Corporate Operations) Buy 1,000 3.92 3,915
2013-11-29 Sinskey Anthony J Buy 3,800 3.92 14,877
2013-11-29 Porter Michael E Buy 25,000 3.79 94,825
2013-11-27 Mcclements William M. (SVP of Corporate Operations) Buy 6,000 3.56 21,342
2013-11-27 Porter Michael E Buy 50,000 3.51 175,350
2013-11-27 Crocker Gary L Buy 207,000 3.72 769,626
2013-05-06 Mulroy Robert J. (President and CEO) Option Ex 50,000 2.19 109,500
2013-04-29 Stewart Edward J. (SVP & Pres, Healthcare Sol) Option Ex 5,000 2.19 10,950
2013-04-25 Dresser James Van B. Option Ex 15,000 2.19 32,850
2013-04-24 Nielsen Ulrik B. (SVP and CSO) Sale 10,483 5.40 56,566
2013-04-24 Nielsen Ulrik B. (SVP and CSO) Option Ex 10,483 2.19 22,957
2013-04-24 Sinskey Anthony J Option Ex 15,000 2.19 32,850
2013-04-15 Fehr Gordon J. Sale 15,000 6.04 90,645
2013-04-15 Fehr Gordon J. Option Ex 15,000 2.19 32,850
2013-02-05 Niyikiza Clet M. (EVP of Development) Option Ex 41,507 2.12 87,994
2012-12-18 Niyikiza Clet M. (EVP of Development) Option Ex 100,000 2.12 212,000
2012-12-17 Khan Fazal R. (SVP of Manufacturing) Sale 25,000 6.41 160,350
2012-12-17 Khan Fazal R. (SVP of Manufacturing) Option Ex 25,000 1.71 42,750
2012-12-17 Porter Michael E Option Ex 15,000 2.19 32,850
2012-12-14 Mendelsohn John Buy 5,000 6.63 33,145
2012-12-13 Khan Fazal R. (SVP of Manufacturing) Sale 25,000 6.73 168,325
2012-12-13 Khan Fazal R. (SVP of Manufacturing) Option Ex 25,000 1.71 42,750
2012-12-13 Crocker Gary L Buy 36,500 6.77 247,214
2012-12-10 Porter Michael E Buy 10,000 6.08 60,800
2012-12-03 Nielsen Ulrik B. (SVP and CSO) Sale 75,000 7.37 552,750
2012-09-14 Crocker Gary L Buy 64,800 8.33 539,719
2012-08-24 Quigley James H. Buy 12,500 7.53 94,062
2012-08-01 Sinskey Anthony J Option Ex 20,000 2.19 43,800
2012-07-24 Dresser James Van B. Option Ex 20,000 2.19 43,800
2012-07-16 Nielsen Ulrik B. (SVP and CSO) Option Ex 4,368 2.19 9,565
2012-07-03 Fehr Gordon J. Option Ex 20,000 2.19 43,800
2012-06-15 Mulroy Robert J. (President and CEO) Option Ex 75,000 2.19 164,250
2012-04-27 Stewart Edward J. (SVP & Pres, Healthcare Sol) Option Ex 16,385 2.19 35,883
2012-04-25 Lovenberg Walter M Phd Option Ex 5,462 2.19 11,961
2012-04-19 Sinskey Anthony J Option Ex 5,462 2.19 11,961
2012-04-17 Fehr Gordon J. Option Ex 5,462 2.19 11,961
2012-04-10 Dresser James Van B. Option Ex 5,462 2.19 11,961
2012-04-03 Fehr Gordon J. Buy 1,428 7.00 9,996
2012-04-03 Sinskey Anthony J Buy 7,142 7.00 49,994
2012-04-03 Lovenberg Walter M Phd Buy 1,428 7.00 9,996
2012-04-03 Porter Michael E Buy 12,500 7.00 87,500
2012-04-03 Crocker Gary L Buy 139,998 7.00 979,986

Insider trading activities including stock purchases, stock sales, and option exercises of MACK listed in the above tables cannot be completely guaranteed as to their accuracy. For more insider trading information of Merrimack Pharmaceuticals Inc (symbol MACK, CIK number 1274792) see the Securities and Exchange Commission (SEC) website.