POWER OF ATTORNEY
Know all by these presents, that the undersigned hereby constitutes and appoints Janet Clennett and
Gregory Chow as the undersigned’s true and lawful attorney-in-fact to:
execute for and on behalf of the undersigned, in the undersigned’s capacity as an officer, director and/or 10% shareholder of Aptose Biosciences Inc. (the
“Company”), Forms 3, 4 and 5 (including amendments thereto) in accordance with Section 16(a) of the
Securities Exchange Act of 1934 and the rules and regulations thereunder and any Form ID, Uniform Application for Access Codes to File on Edgar, or Update Passphrase Form;
do and perform any and all acts for and on behalf of the undersigned which may be necessary or desirable to complete and execute any such Forms 3, 4 or 5,
Form ID or Update Passphrase Form and timely file such forms (including amendments thereto) and application with the United States Securities and Exchange Commission and any stock exchange or similar authority; and
take any other action of any type whatsoever in connection with the foregoing which, in the opinion of such attorney-in-fact, may be of benefit to, in the
best interest of, or legally required by, the undersigned, it being understood that the documents executed by such attorney-in-fact on behalf of the undersigned pursuant to this Power of Attorney shall be in such form and shall
contain such terms and conditions as such attorney-in-fact may approve in such attorney-in-fact’s discretion.
The undersigned hereby grants to each such attorney-in-fact full power and authority to do and perform any and every
act and thing whatsoever requisite, necessary or proper to be done in the exercise of any of the rights and powers herein granted, as fully to all intents and purposes as the undersigned might or could do if personally present, with full power
of substitution or revocation, hereby ratifying and confirming all that such attorney-in-fact, or such attorney-in-fact’s substitute or substitutes, shall lawfully do or cause to be done by virtue of this power of attorney and the rights and
powers herein granted. The undersigned acknowledges that the foregoing attorneys-in-fact, in serving in such capacity at the request of the undersigned, are not assuming, nor is the Company assuming, any of the undersigned’s responsibilities to
comply with Section 16 of the Securities Exchange Act of 1934.
The undersigned agrees that each such attorney-in-fact herein may rely entirely on information furnished orally or in
writing by the undersigned to such attorney-in-fact. The undersigned also agrees to indemnify and hold harmless the Company and each such attorney-in-fact against any losses, claims, damages or liabilities (or actions in these respects) that
arise out of or are based upon any untrue statements or omission of necessary facts in the information provided by the undersigned to such attorney-in fact for purposes of executing, acknowledging, delivering or filing Forms 3, 4 or 5
(including amendments thereto), Form ID or Update Passphrase Form and agrees to reimburse the Company and such attorney-in-fact for any legal or other expenses reasonably incurred in connection with investigating or defending against any such
loss, claim, damage, liability or action.
This Power of Attorney supersedes any power of attorney previously executed by the undersigned regarding the purposes
outlined in the first paragraph hereof (“Prior Powers of Attorney”), and the authority of the attorneys-in-fact named in
any Prior Powers of Attorney is hereby revoked.
This Power of Attorney shall remain in full force and effect until the undersigned is no longer required to file
Forms 3, 4 or 5 with respect to the undersigned’s holdings of and transactions in securities issued by
the Company, unless earlier (a) revoked by the undersigned in a signed writing delivered to the foregoing
attorneys-in-fact or (b) superseded by a new power of attorney regarding the purposes outlined in the first paragraph hereof dated as of a later date.
IN WITNESS WHEREOF, the undersigned has caused this Power of Attorney to be executed as of this 4th day of June, 2019.
/s/ Jotin Marango