X0303 4 2011-02-23 0001097264 ALLOS THERAPEUTICS INC ALTH 0001202769 BERNS PAUL L 11080 CIRCLEPOINT ROAD SUITE 200 WESTMINSTER CO 80020 1 Chief Executive Officer Common Stock 2011-02-23 4 S 0 9193 3.2501 D 404042 D Common Stock 2011-02-24 4 S 0 4255 3.124 D 399787 D These shares are being sold pursuant to a 10b5-1 plan for Paul L. Berns 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. The price represents the weighted average sale price for multiple transactions reported on this line. The prices of the transactions ranged from $3.25 to $3.2501. Upon request of the SEC staff, Allos Therapeutics, Inc. (the "Company") or a security holder of the Company, the reporting person will provide full information regarding the number of shares sold at each separate price. These shares are being sold pursuant to a 10b5-1 plan for Paul L. Berns 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. The price represents the weighted average sale price for multiple transactions reported on this line. The prices of the transactions ranged from $3.12 to $3.1250. Upon request of the SEC staff, Allos Therapeutics, Inc. (the "Company") or a security holder of the Company, the reporting person will provide full information regarding the number of shares sold at each separate price. /s/ David C. Clark, Attorney-in-Fact for Paul L. Berns 2011-02-25