X0306 4 2017-06-05 0001464423 PennyMac Mortgage Investment Trust PMT 0001275713 SPECTOR DAVID C/O PENNYMAC MORTGAGE INVESTMENT TRUST 3043 TOWNSGATE ROAD WESTLAKE VILLAGE CA 91361 1 1 President and CEO Common Shares of Beneficial Interest 2017-06-05 4 S 0 8235 17.5918 D 271341 D The common shares of beneficial interest were sold pursuant to a 10b5-1 plan. The price reported is the weighted average price of multiple transactions ranging from $17.54 to $17.73. The reporting person hereby undertakes to provide upon request to the SEC, the Issuer or a security holder of the Issuer the number of common shares of beneficial interest and the prices at which the transactions were effected. The reported amount consists of 83,135 restricted share units and 188,206 common shares of beneficial interest. The restricted share units are to be settled in an equal number of common shares of beneficial interest upon vesting. /s/ Derek W. Stark, attorney-in-fact for Mr. Spector 2017-06-07