| Symbol | Relationship | Date | Transaction | Cost | # Shares | Value($) | Total Shares | Form 4 |
| ATK | Sr VP Gen Counsel & Secy | May 17, 2011 | Option Exercise | $72.70 | 52 | 3,780 | 3,228 | May 19, 2011, 09:07 AM |
| ATK | Sr VP Gen Counsel & Secy | Dec 01, 2010 | Sale | $75.31 | 7,340 | 552,772 | 10,168 | Dec 02, 2010, 10:56 AM |
| ATK | Sr VP Gen Counsel & Secy | Dec 01, 2010 | Option Exercise | $64.65 | 19,000 | 1,228,420 | 22,228 | Dec 02, 2010, 10:53 AM |
| ATK | Sr VP Gen Counsel & Secy | Dec 01, 2010 | Sale | $75.04 | 11,660 | 875,016 | 15,368 | Dec 02, 2010, 10:53 AM |
| Symbol | Relationship | Date | Transaction | Value($) |
| ATK | Sr VP Gen Counsel & Secy | May 17, 2011 | Option Exercise | 3,780 |
| ATK | Sr VP Gen Counsel & Secy | Dec 01, 2010 | Sale | 552,772 |
| ATK | Sr VP Gen Counsel & Secy | Dec 01, 2010 | Option Exercise | 1,228,420 |
| ATK | Sr VP Gen Counsel & Secy | Dec 01, 2010 | Sale | 875,016 |