X0306 4 2016-08-19 0 0001478102 Western Asset Mortgage Defined Opportunity Fund Inc. DMO 0001240480 CRONIN DANIEL P 620 EIGHTH AVENUE 49TH FLOOR NEW YORK NY 10018 1 0 0 0 Common Stock 2016-08-19 4 S 0 2000 24.19 D 4794.55 D The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.19 to $24.20, inclusive. Mr. Cronin undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth above. Includes shares purchased pursuant to the Fund's Dividend Reinvestment Plan. /s/ George P. Hoyt by Power of Attorney for Daniel P. Cronin 2016-08-22