X0101 EFFECT 33 LIVE 2021-06-23 16:30:00

S-3

0001449488 CSI Compressco LP 333-256737 0001643404 CSI Compression Holdings, LLC 333-256737-09 0001643415 Rotary Compressor Systems, Inc. 333-256737-08 0001606147 CSI Compressco Leasing LLC 333-256737-07 0001606186 CSI Compressco Holdings LLC 333-256737-06 0001606149 CSI Compressco International LLC 333-256737-05 0001606144 CSI Compressco Field Services International LLC 333-256737-04 0001606146 CSI Compressco Operating LLC 333-256737-03 0001606142 CSI Compressco Sub Inc. 333-256737-02 0001606141 CSI Compressco Finance Inc. 333-256737-01