X0305 4/A 2012-02-28 2012-03-01 0001097264 ALLOS THERAPEUTICS INC ALTH 0001489966 Morris Charles Q 11080 CIRCLEPOINT ROAD SUITE 200 WESTMINSTER CO 80020 1 Chief Medical Officer Common Stock 2012-02-28 4 A 0 241848 0 A 683448 D Common Stock 2012-02-29 4 S 0 10155 1.5242 D 673293 D Common Stock 2012-03-01 4 S 0 10292 1.48 D 663001 D Represents shares of common stock issued as restricted stock units ("RSUs") awarded under the Company's 2008 Equity Incentive Plan (the "Plan"). The RSUs shall vest in a series of eight (8) successive equal semi-annual installments over the four (4)-year period measured from March 18, 2012 (the "Vesting Commencement Date"), subject to Participant's Continuous Service through each such date. These shares are being sold pursuant to a 10b5-1 plan for Charles Q. Morris 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 28, 2012. The price represents the weighted average sale price for multiple transactions reported on this line. The prices of the transactions ranged from $1.52 to $1.54. 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 Charles Q. Morris 2012-05-22