0000912282-23-000385.txt : 20230925 0000912282-23-000385.hdr.sgml : 20230925 20230925170339 ACCESSION NUMBER: 0000912282-23-000385 CONFORMED SUBMISSION TYPE: 4 PUBLIC DOCUMENT COUNT: 2 CONFORMED PERIOD OF REPORT: 20230922 FILED AS OF DATE: 20230925 DATE AS OF CHANGE: 20230925 REPORTING-OWNER: OWNER DATA: COMPANY CONFORMED NAME: Seizinger Bernd R. CENTRAL INDEX KEY: 0001789042 FILING VALUES: FORM TYPE: 4 SEC ACT: 1934 Act SEC FILE NUMBER: 001-32001 FILM NUMBER: 231276456 MAIL ADDRESS: STREET 1: 535 BOYLSTON STREET CITY: BOSTON STATE: MA ZIP: 02116 FORMER NAME: FORMER CONFORMED NAME: Seizinger Bernd DATE OF NAME CHANGE: 20190923 ISSUER: COMPANY DATA: COMPANY CONFORMED NAME: Aptose Biosciences Inc. CENTRAL INDEX KEY: 0000882361 STANDARD INDUSTRIAL CLASSIFICATION: BIOLOGICAL PRODUCTS (NO DIAGNOSTIC SUBSTANCES) [2836] IRS NUMBER: 000000000 STATE OF INCORPORATION: A6 FISCAL YEAR END: 1231 BUSINESS ADDRESS: STREET 1: 251 CONSUMERS ROAD STREET 2: SUITE 1105 CITY: TORONTO STATE: A6 ZIP: M2J 4R3 BUSINESS PHONE: 647-479-9828 MAIL ADDRESS: STREET 1: 251 CONSUMERS ROAD STREET 2: SUITE 1105 CITY: TORONTO STATE: A6 ZIP: M2J 4R3 FORMER COMPANY: FORMER CONFORMED NAME: Aptose Biosciences Inc., (formerly LORUS THERAPEUTICS INC.) DATE OF NAME CHANGE: 20140905 FORMER COMPANY: FORMER CONFORMED NAME: LORUS THERAPEUTICS INC DATE OF NAME CHANGE: 19990308 FORMER COMPANY: FORMER CONFORMED NAME: IMUTEC PHARMA INC DATE OF NAME CHANGE: 19970113 4 1 form4.xml X0508 4 2023-09-22 0000882361 Aptose Biosciences Inc. APTO 0001789042 Seizinger Bernd R. C/O APTOSE BIOSCIENCES INC. 251 CONSUMERS ROAD, SUITE 1105 TORONTO A6 M2J 4R3 ONTARIO, CANADA true false Common Shares 2023-09-22 4 P 0 17000 3.14 A 17000 D The purchase price reported above is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $3.13 to $3.14, inclusive. The reporting person undertakes to provide to Aptose Biosciences Inc.., any security holder of Aptose Biosciences Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote. Exhibit 24.2 Power of Attorney /s/ Bernd R. Seizinger 2023-09-25 EX-24.2 2 poa.htm POWER OF ATTORNEY


POWER OF ATTORNEY
Know all by these presents, that the undersigned hereby constitutes and appoints Leslie Auld, Brooks Ensign, and Fletcher Payne, each acting alone, as the undersigned’s true and lawful attorney-in-fact to:

 (1)
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;

(2)
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

(3)
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 25th day of September, 2023.
/s Bernd R. Seizinger 
Bernd R. Seizinger