Insider Stock Trading History of Chang Michael N


The following table details the trading activities (stock purchases, stock sales, and stock option exercises) reported to the Securities and Exchange Commission (SEC) by insider Chang Michael N since year 2005. The trader's CIK number is 1380901. At the time of this reporting, Chang Michael N is the CEO and President of Optimer Pharmaceuticals Inc . (stock ticker symbol OPTR). See this page for all insider trading activities at Optimer Pharmaceuticals Inc .


Stock purchases, sales, and option exercises reported by insider Chang Michael N since 2005.
  Trade Date   Symbol Company Name (Issuer) Trade Type     Shares       Price ($)   Value ($)
2013-09-04 OPTR Optimer Pharmaceuticals Inc Option Ex 281,615 8.39 2,361,623
2013-04-23 OPTR Optimer Pharmaceuticals Inc Option Ex 117,263 1.08 126,995
2013-04-09 OPTR Optimer Pharmaceuticals Inc Option Ex 103,125 12.34 1,272,562
2013-04-03 OPTR Optimer Pharmaceuticals Inc Option Ex 145,312 12.34 1,793,150
2011-04-25 OPTR Optimer Pharmaceuticals Inc Option Ex 100,000 1.08 108,300
2010-06-01 OPTR Optimer Pharmaceuticals Inc Option Ex 6,922 2.17 15,020
2010-01-04 OPTR Optimer Pharmaceuticals Inc Option Ex 150,364 1.08 162,844
2009-12-28 OPTR Optimer Pharmaceuticals Inc Buy 10,000 10.85 108,500
2009-12-29 OPTR Optimer Pharmaceuticals Inc Buy 8,000 10.80 86,400
2009-11-25 OPTR Optimer Pharmaceuticals Inc Buy 15,000 11.52 172,725
2009-01-07 OPTR Optimer Pharmaceuticals Inc Option Ex 51,538 .43 22,315
2008-06-13 OPTR Optimer Pharmaceuticals Inc Buy 5,000 7.00 35,000
2008-05-15 OPTR Optimer Pharmaceuticals Inc Buy 4,542 6.04 27,410
2007-11-15 OPTR Optimer Pharmaceuticals Inc Buy 2,000 5.95 11,900
2007-08-09 OPTR Optimer Pharmaceuticals Inc Buy 30,000 8.20 245,999
2007-08-06 OPTR Optimer Pharmaceuticals Inc Buy 10,000 9.05 90,500
2007-07-16 OPTR Optimer Pharmaceuticals Inc Buy 10,000 9.86 98,600
2007-02-14 OPTR Optimer Pharmaceuticals Inc Buy 114,965 7.00 804,755

Insider trading activities including stock purchases, stock sales, and option exercises listed in the above table cannot be completely guaranteed as to their accuracy. For more information regarding the trades made by Chang Michael N (CEO and President of Optimer Pharmaceuticals Inc at the time of this reporting) see the Securities and Exchange Commission (SEC) website.