X0306 4 2018-05-03 0 0001095565 HEALTHSTREAM INC HSTM 0001485077 Sousa Michael 209 10TH AVE. SOUTH SUITE 450 NASHVILLE TN 37203 0 1 0 0 Senior Vice President Common Stock 2018-05-03 4 S 0 16005 25.0891 D 13830 D This transaction was executed in multiple trades. The price reported above reflects the weighted average sale price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer, or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected. Michael Sousa 2018-05-07