X0305 4 2012-05-15 0001449488 Compressco Partners, L.P. GSJK 0001221980 SULLIVAN WILLIAM D 24955 INTERSTATE 45 NORTH THE WOODLANDS TX 77380 1 0 0 0 Common Units representing limited partner interests 2012-05-15 4 P 0 4900 13.449 A 18003 D The price reported in Column 4 is a weighted average price. These units were purchased in multiple transactions at prices ranging from $13.19 to $13.50, inclusive. The reporting person undertakes to provide to Compressco Partners, L.P., any security holder of Compressco Partners, L.P., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of units purchased at each separate price within the range set forth in this footnote. Eileen M. Price, Attorney-in-fact for William D. Sullivan 2012-05-16