X0306 4 2015-06-03 0001464423 PennyMac Mortgage Investment Trust PMT 0001275713 SPECTOR DAVID C/O PENNYMAC MORTGAGE INVESTMENT TRUST 6101 CONDOR DRIVE MOORPARK CA 93021 1 1 President and COO Common Shares of Beneficial Interest 2015-06-03 4 S 0 8235 18.4713 D 281437 D The common shares of beneficial interest were sold pursuant to a 10b5-1 plan in order to pay estimated tax obligations resulting from the vesting of 13,725 restricted share units on June 3, 2015. The price reported is the weighted average price of multiple transactions at prices ranging from $18.415 to $18.53. 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 135,836 restricted share units and 145,601 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 2015-06-05