X0303 4 2010-12-21 0 0000106535 WEYERHAEUSER CO WY 0001192298 KIECKHEFER JOHN I PO BOX 1151 PRESCOTT AZ 86302 1 0 0 0 Common Shares 2010-12-21 4 S 0 726000 18.488 D 4578258 I Trusts FBO my immediate family and siblings Common Shares 2010-12-22 4 S 0 482000 18.435 D 4096258 I Trusts FBO my immediate family and siblings The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.45 to $18.57, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this Form 4. The price reported in column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.40 to $18.49, inclusive. The reporting person undertakes to provide to the issuer, any security holder of the issuer, or the staff of the SEC, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this Form 4. John I. Kieckhefer 2010-12-22