Aptose Announces Closing of Public Offering of Common Shares

On December 19, 2019 Aptose Biosciences Inc. ("Aptose" or the "Company") (NASDAQ: APTO, TSX: APS), reported the closing of its previously announced underwritten public offering of 18,543,750 common shares (the "Offering") at the public offering price of US$4.00 per share (Press release, Aptose Biosciences, DEC 19, 2019, View Source [SID1234552498]). The number of shares sold includes the full exercise by the underwriters of their option to purchase additional common shares in the Offering. Gross proceeds from the Offering, before deducting underwriting discounts and commissions and estimated offering expenses payable by Aptose, are approximately US$74.2 million.

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Piper Jaffray & Co. acted as the sole active book-running manager and Canaccord Genuity acted as passive book-running manager for the Offering. Oppenheimer & Co. acted as lead manager and JonesTrading Institutional Services LLC acted as co-manager for the Offering.

No common shares were offered or sold in Canada as part of this Offering. The Company is relying on the exemption set forth in Section 602.1 of the TSX Company Manual, which provides that the TSX will not apply its standards to certain transactions involving eligible interlisted issuers on a recognized exchange, such as Nasdaq.

The securities described above were offered by Aptose pursuant to a shelf registration statement on Form S-3 (File. No. 333-230218), including a base prospectus, that was previously filed by Aptose with the Securities and Exchange Commission ("SEC") and declared effective on April 25, 2019. A prospectus supplement and the accompanying prospectus have been filed with the SEC and is available on the SEC’s website at www.sec.gov. Alternatively, copies of the prospectus supplement and the accompanying prospectus may be obtained, once available, from Piper Jaffray & Co., Attention: Prospectus Department, 800 Nicollet Mall, J12S03, Minneapolis, MN 55402, by email at [email protected] or by phone: 1-800-747-3924.

This press release does not constitute an offer to sell or the solicitation of offers to buy any securities of Aptose, and shall not constitute an offer, solicitation or sale of any security in any state or jurisdiction in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state or jurisdiction.