| Transaction Date | Filer | Title | Filing | Transaction Type | Shares Traded | Price | Total Held* |
|---|---|---|---|---|---|---|---|
| Aug 23, 2005 | Acting Pres., Mission Systems | Form 3 | Initial Statement of Beneficial Ownership of Securities | -- | -- | -- | |
| May 12, 2011 | Chf. Exec. Officer & President | Form 4 | Other acquisition or disposition (describe transaction) | 9,750 | -- | 317,379 | |
| May 12, 2011 | Chf. Exec. Officer & President | Form 4 | Other acquisition or disposition (describe transaction) | 9,750 | -- | 142,668 | |
| May 12, 2011 | Chf. Exec. Officer & President | Form 4 | Other acquisition or disposition | -- | -- | 4,782 | |
| May 12, 2011 | Chf. Exec. Officer & President | Form 4 | Other acquisition or disposition | -- | -- | 2,861 | |
| May 10, 2011 | Chf. Exec. Officer & President | Form 4 | Other acquisition or disposition | -- | -- | 132,918 | |
| May 10, 2011 | Chf. Exec. Officer & President | Form 4 | Other acquisition or disposition | -- | -- | 4,782 | |
| May 10, 2011 | Chf. Exec. Officer & President | Form 4 | Other acquisition or disposition | -- | -- | 2,861 | |
| May 09, 2011 | Chf. Exec. Officer & President | Form 4 | Exercise or conversion of derivative security exempted pursuant to Rule 16b-3 | 54,688 | $43.14 | 372,067 | |
| May 09, 2011 | Chf. Exec. Officer & President | Form 4 | Payment of exercise price or tax liability by delivering or withholding securities incident to the receipt, exercise or vesting of a security issued in accordance with Rule 16b-3 | 36,402 | $64.81 | 335,665 |
* Represents the number of non-derivative securities directly held. (I) Indicates that some (or all) of these shares are held indirectly.