Transaction Details

Footnotes

The price reported in Column 4 is a weighted-average price. These shares were purchased in multiple transactions at prices ranging from $70.9600 to $71.9000, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote. | Held by the F. Thomson Leighton and Bonnie B. Leighton Revocable Trust dtd 11/3/99 of which Mr. Leighton serves as a trustee. Mr. Leighton disclaims beneficial ownership of shares held by such trust except to the extent of his pecuniary interest therein. | Includes 10,481 shares received pursuant to a distribution from the David T. Leighton trust, of which the Reporting Person served as trustee. Such distribution was made in accordance with the exemptions afforded under 16a-9 and 16a-13. | The price reported in Column 4 is a weighted-average price. These shares were purchased in multiple transactions at prices ranging from $71.9800 to $72.9350, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote. | Held by the TBL Foundation of which Mr. Leighton serves as a trustee.