Together with cash on hand, the fully leveraged facility extends Aptevo's funding runway into 2029, enabling achievement of key clinical and preclinical milestones SEATTLE, WA / ACCESS Newswire / January 9, 2026 / Aptevo Therapeutics Inc. (NASDAQ:APVO), a clinical-stage biotechnology Company focused on developing novel immune-oncology therapeutics based on its proprietary ADAPTIR® and ADAPTIR-FLEX® platform technologies, today announced that the Company has entered into a $60 million equity line of credit ( ...

Core Insights - Aptevo Therapeutics has presented preclinical data for its trispecific antibody candidate, APVO451, at the Society for Immunotherapy of Cancer Annual Meeting, highlighting its potential in treating hard-to-treat solid tumors [1][2]. Company Update - APVO451 is designed to address the challenge of immune suppression in solid tumors, such as urothelial, breast, and pancreatic cancers, by utilizing a proprietary CRIS-7-derived CD3 binding domain [2][3]. - The molecule aims to activate the intratumoral immune system, enhancing the ability to target and kill tumor cells effectively [3]. Key Findings from the Presentation - APVO451 demonstrated local activation of T-cells and antigen-presenting cells (APCs) only when bound to the target protein, nectin-4, indicating a favorable safety profile [4]. - The candidate showed dual immune re-activation by stimulating T-cell effector functions and restoring APC function, addressing a common failure point in solid tumor treatments [4]. - In tumor models simulating suppression, APVO451 was more effective in eliminating nectin-4-positive tumor cells compared to standard CD3 T-cell engagers, suggesting its potential to overcome suppressive tumor environments [4]. Next Steps - Aptevo is advancing APVO451 through ongoing preclinical studies to support IND-enabling work and future clinical development targeting nectin-4-expressing solid tumors [5]. About APVO451 - APVO451 is a trispecific ADAPTIR-FLEX therapeutic candidate designed to engage CD3 and CD40, aiming to restore immune engagement in suppressive solid tumors while minimizing off-tumor activation [6]. About Aptevo Therapeutics - Aptevo Therapeutics is a clinical-stage biotechnology company focused on developing novel bispecific and trispecific immunotherapies for cancer treatment, with two clinical candidates currently in trials [7].

Core Insights - Aptevo Therapeutics reported that 89% of evaluable frontline AML patients achieved remission in combination therapy across two trials, with a notable 100% remission rate in Cohort 3 of the ongoing RAINIER trial [1][1][1] - The company introduced its first trispecific molecules, APVO451 and APVO452, aimed at overcoming immune suppression in certain solid tumors, utilizing a unique CRIS-7-derived CD3 binding domain [1][1][1] - Aptevo's CD3 T-cell engager portfolio has been expanded to five molecules, indicating growth in its therapeutic offerings [1][1][1] - The company raised $18.7 million in the third quarter and an additional $4.1 million since the quarter ended, extending its cash runway into the fourth quarter of 2026 [1][1][1] Financial Performance - The financial results for the quarter ended September 30, 2025, were reported alongside a business update, highlighting the company's ongoing development in immune-oncology therapeutics [1][1][1]

As filed with the Securities and Exchange Commission on October 1, 2025 Registration No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 APTEVO THERAPEUTICS INC. (Exact Name of Registrant as Specified in Its Charter) Delaware 2834 81-1567056 (State or Other Jurisdiction of Incorporation or Organization) (Primary Standard Industrial Classification Code Number) (I.R.S. Employer Identification Number) 2401 4th Avenue, ...