X0304 4 2011-07-29 0001267902 WESTERN ASSET/CLAYMORE INFLATION-LINKED OPPORTUNITIES & INCOME FUND WIW 0001052192 CASCADE INVESTMENT LLC 2365 CARILLON POINT KIRKLAND WA 98033 1 0000902012 GATES WILLIAM H III ONE MICROSO REDMOND WA 98052 1 Common Stock 2011-07-29 4 P 0 290330.0000 12.6001 A 7184427.0000 D This transaction was executed in multiple trades at prices ranging from $12.5599 to $12.64. The price reported above reflects the weighted-average price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transactions were effected. /s/ Alan Heuberger, Attorney-in-fact for each of Michael Larson, Business Manager for Cascade Investment, L.L.C. and William H. Gates III 2011-08-02 /s/ William H. Gates III by Alan Heuberger, Attorney-in-fact 2011-08-02