X0303 4 2011-02-23 0001097264 ALLOS THERAPEUTICS INC ALTH 0001500322 Goldsmith Bruce A 11080 CIRCLEPOINT ROAD SUITE 200 WESTMINSTER CO 80020 1 VP, Corporate Development Common Stock 2011-02-23 4 S 0 2250 3.25 D 125233 D Common Stock 2011-02-24 4 S 0 507 3.1215 D 124726 D These shares are being sold pursuant to a 10b5-1 plan for Bruce A. Goldsmith in order to cover the withholding tax and other costs associated with such sale (i.e., wire fees, commission or interest) in connection with the vesting of restricted stock units on February 22, 2011. These shares are being sold pursuant to a 10b5-1 plan for Bruce A. Goldsmith in order to cover the withholding tax and other costs associated with such sale (i.e., wire fees, commission or interest) in connection with the vesting of restricted stock units on February 23, 2011. /s/ David C. Clark, Attorney-in-Fact for Bruce A. Goldsmith 2011-02-25