CTIC CTI BioPharma Corporation

As filed with the Securities and Exchange Commission on June 26, 2023

Registration No. 333-108926

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

POST-EFFECTIVE AMENDMENT NO. 6 TO:

FORM S-3

REGISTRATION STATEMENT NO. 333-108926

UNDER

THE SECURITIES ACT OF 1933

3101 Western Avenue, Suite 800

Seattle, Washington 98121

(Address, including zip code, and telephone number, including area code of registrant’s principal executive offices)

Approximate date of commencement of proposed sale to the public: Not Applicable

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DEREGISTRATION OF UNSOLD SECURITIES

These post-effective amendments (the “Post-Effective Amendments”) relate to the following Registration Statements on Form S-3 (the “Registration Statements”) filed with the Securities and Exchange Commission (the “Commission”) of CTI BioPharma Corp., a Delaware corporation (the “Company”), to deregister any and all securities, registered but unsold or otherwise unissued as of the date hereof under the Registration Statements:

Pursuant to the Agreement and Plan of Merger, dated as of May 10, 2023 (the “Merger Agreement”), by and among Swedish Orphan Biovitrum AB (publ), a Swedish public limited liability company (“Parent”), Cleopatra Acquisition Corp., a Delaware corporation and a wholly owned, indirect subsidiary of Parent (“Purchaser”), and the Company, Purchaser merged with and into the Company with the Company surviving the merger as a wholly owned subsidiary of Parent. The Merger became effective on June 26, 2023, upon the filing of the certificate of merger with the Secretary of State of the State of Delaware.

As a result of the transactions contemplated by the Merger Agreement, the Company has terminated all offerings of its securities pursuant to the Registration Statements and, in accordance with undertaking made by the Company in the Registration Statements to remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination of the offering, hereby removes and withdraws from registration all securities registered pursuant to the Registration Statements that remain unsold as of the date hereof. The Registration Statements are hereby amended, as appropriate, to reflect the deregistration of such securities.

SIGNATURE

Pursuant to the requirements of the Securities Act of 1933, as amended, the Company certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form S-3 and has duly caused these Post-Effective Amendments to the Registration Statements to be signed on its behalf by the undersigned, thereunto duly authorized, in Visby, Sweden, on June 26, 2023.

Pursuant to the Rule 478 of the Securities Act of 1933, as amended, no other person is required to sign these Post-Effective Amendments to the Registration Statements.