X0306 4 2013-06-08 1 0000949428 CLEAN DIESEL TECHNOLOGIES INC CDTI 0001502954 Shea David Eric C/O CLEAN DIESEL TECHNOLOGIES, INC. 4567 TELEPHONE ROAD, SUITE 100 VENTURA CA 93003 0 1 0 0 Vice President, Finance Common Stock 2013-06-08 4 M 0 557 0 A 5976 D Common Stock 2013-06-11 4 S 0 277 2.0288 D 5699 D Restricted Share Units 2013-06-08 4 M 0 557 0 D Common Stock 557 0 D Shares of Common Stock acquired upon vesting of Restricted Share Units (RSUs) granted June 8, 2011 pursuant to the CDTI Stock Incentive Plan. Shares were sold to cover the reporting person's tax obligation in connection with the vesting of RSUs and conversion into shares of Common Stock. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $2.02 to $2.04, inclusive. The reporting person undertakes to provide CDTI, any security holder of CDTI or the staff of the Securities and Exchange Commission upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote to this Form 4. Each RSU represents a contingent right to receive one share of CDTI common stock. RSUs vested as to 556 shares on June 17, 2011 and 557 shares on each of June 8, 2012 and June 8, 2013. Settlement and delivery of shares for June 8, 2013 vesting occurred on June 10, 2013. /s/Kristi Cushing for David E. Shea 2013-06-11