Table of Contents UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Commission File Number: 001-35703 PUMA BIOTECHNOLOGY, INC. (Exact name of registrant as specified in its charter) Delaware 77-0683487 (State or other jurisdiction of incorporation or organization) (I.R.S. Employer Identification Number) FORM 10-Q ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2026 OR ☐ TRANSITION REPORT PURSUANT TO SECT ...