Entry into a Material Definitive Agreement

On March 31, 2021, CTI BioPharma Corp. (the "Company") reported that entered into an underwriting agreement (the "Underwriting Agreement") with Stifel Nicolaus & Company, Incorporated and JMP Securities LLC (the "Representatives"), as representatives of the underwriters named therein (the "Underwriters"), relating to the offer and sale (the "Offering") of 14,260,800 shares of the Company’s common stock, par value $0.001 per share (the "Common Stock"), at a public offering price of $2.50 per share , and 600 shares of the Company’s Series X1 convertible preferred stock, par value $0.001 per share (the "Series X1 Preferred Stock"), at a public offering price of $25,000 per share (Filing, 8-K, CTI BioPharma, MAR 31, 2021, View Source [SID1234577615]). In addition, the Company granted the Underwriters a 30-day option to purchase up to an additional 2,139,120 shares of its Common Stock on the same terms and conditions (the "Option"). On April 5, 2021, the Underwriters exercised the Option in full.

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The aggregate gross proceeds to the Company from the Offering and the Option are approximately $56.0 million, before deducting underwriting discounts and estimated offering expenses.

The securities described above were issued pursuant to the Company’s effective shelf registration statement on Form S-3 (File No. 333-251161) (the "Registration Statement"), filed with the Securities and Exchange Commission (the "SEC") on December 7, 2020 and declared effective on December 15, 2020. On March 31, 2021, the Company filed a prospectus supplement with the SEC in connection with the Offering. The Offering and the Option closed on April 6, 2021.

In the Underwriting Agreement, the Company agreed to indemnify the Underwriters against certain liabilities, including liabilities under the Securities Act of 1933, as amended, or to contribute payments that the Underwriters may be required to make because of such liabilities. The foregoing description of the Underwriting Agreement is not complete and is qualified in its entirety by references to its full text, a copy of which is filed as Exhibit 1.1 to this Current Report on Form 8-K and incorporated by reference herein.