X0303 4 2010-12-01 0001088033 QUEST SOFTWARE INC QSFT 0001106662 SMITH VINCENT C C/O QUEST SOFTWARE, INC. 5 POLARIS WAY ALISO VIEJO CA 92656 1 1 1 0 Executive Chairman Common Stock 2010-12-01 4 S 0 9000 26.17 D 24918959 D Common Stock 2010-12-02 4 S 0 9000 26.56 D 24909959 D Common Stock 2010-12-03 4 S 0 11000 27.14 D 24898959 D Common Stock 153440 I By children Common Stock 2000000 I By Vincent C. Smith Jr. Annuity Trust 2010-1 Common Stock 1500000 I By Vincent C. Smith Jr. Annuity Trust 2010-2 This transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 9, 2010. Sale prices for the transactions reported here range from $25.81 to $26.30. Full information regarding the number of shares sold at each separate price will be provided to the SEC, the issuer or its stockholders upon request. Sale prices for the transactions reported here range from $26.14 to $26.90. Full information regarding the number of shares sold at each separate price will be provided to the SEC, the issuer or its stockholders upon request. Sale prices for the transactions reported here range form $26.99 to $27.26. Full information regarding the number of shares sold at each separate price will be provided to the SEC, the issuer or its stockholders upon request. David P. Cramer, Attorney-in-Fact for Vincent C. Smith 2010-12-03