X0306 4 2014-04-16 0 0001131096 ATHENAHEALTH INC ATHN 0001204310 KAHANE STEPHEN N 311 ARSENAL STREET WATERTOWN MA 02472 0 1 0 0 President, Enterprise Services Common Stock 2014-04-16 4 S 0 2200 143.40 D 77085 D Common Stock 2014-04-16 4 S 0 7100 144.07 D 69985 D Common Stock 2014-04-16 4 S 0 700 144.66 D 69285 D The sales reported on this Form 4 were made pursuant to a written trading plan adopted by the Reporting Person on February 14, 2014, in accordance with Rule 10b5-1. This price represents the weighted average of sales ranging from $142.57 to $143.56. Upon request by the Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price. Includes 132 shares purchased pursuant to the Issuer's 2007 Employee Stock Purchase Plan on March 31, 2014, which transaction is considered exempt pursuant to Rule 16b-3(c) promulgated under the Securities Exchange Act of 1934. This price represents the weighted average of sales ranging from $143.57 to $144.56. Upon request by the Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price. This price represents the weighted average of sales ranging from $144.60 to $144.73. Upon request by the Commission staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price. /s/ Daniel H. Orenstein Attorney-in-Fact 2014-04-18