BeOne Medicines Showcases Leadership in B-cell Malignancies at ASH 2025

About this update from Beone Medicines Ltd. Class A

BRUKINSA now demonstrates best-in-class sustained efficacy and long-term benefit with a favorable safety profile over more than six years of follow-up data in treatment-naïve and R/R CLL First results from Phase 1/2 sonrotoclax monotherapy study will demonstrate notable speed and depth of clinical responses in patients with R/R MCL, a rare, aggressive cancer New efficacy and safety data will highlight the benefits of potential first-in-class BTK degrader BGB-16673 in patients across multiple hematological malignancies SAN CARLOS, Calif., November 20, 2025 --( BUSINESS WIRE )-- BeOne Medicines Ltd. (Nasdaq: ONC; HKEX: 06160; SSE: 688235), a global oncology company, advances its vision to become the world’s leading oncology company with extensive new data from its differentiated hematology portfolio at the 67 th American Society of Hematology (ASH) Annual Meeting and Exposition in Orlando, Florida, December 6-9. Nearly 50 abstracts have been accepted, including six oral presentations, featuring the company’s three transformative approved and investigational hematology assets – BTK inhibitor BRUKINSA ® (zanubrutinib), BCL2 inhibitor sonrotoclax, and BTK degrader BGB-16673. Key presentations include: "Our data at ASH 2025 raises the bar for patient and physician expectations of what’s possible. Our long-term data drives confidence in duration of response in CLL treatment decisions," said Lai Wang, Ph.D., Global Head of R&D at BeOne. "Six-year SEQUOIA and long-term extension data from patients originally enrolled in ALPINE cement BRUKINSA’s role as the backbone of CLL therapy, and our three innovative B-cell treatment modalities of BTK inhibition, BCL2 inhibition, and BTK degradation have the potential to advance options that evolve with patient needs across all stages of disease." Additional highlights include: Never-before-presented clinical data from BeOne’s emerging pipeline will also be shared at the meeting, including in new combinations and disease areas. Ongoing clinical data from BRUKINSA continue to demonstrate clinically meaningful benefit for patients with CLL/SLL. Presentations also include data leveraging real-world evidence and validated modeling approaches to refine understanding of real-world experience and outcomes achieved with covalent BTK inhibitors. "In CLL, selecting the right therapy for the right patient at the right time is essential, and continuous treatment with BTK inhibitors like BRUKINSA has become central to achieving enduring disease control," said Dany Habr, M.D., Senior Vice President and Head of Medical Affairs, North America & International Markets at BeOne. "Emerging data from real-world settings suggest that BRUKINSA may offer a more manageable side effect profile, including for symptoms such as fatigue, pain, headache – further supporting its role as the BTKi of choice." BeOne Presentations at ASH 2025 (organized chronologically by asset) BRUKINSA: The backbone of the hematology franchise Sonrotoclax: Potential best-in-class next-generation BCL2 inhibitor BGB-16673: Potential first-in-class BTK protein degrader Other hematology assets: BGB-21447, next-generation BCL2 inhibitor Integrative evidence generation and health economics related to BRUKINSA For additional information about our presence at the 2025 ASH Annual Meeting and Exposition, please visit our meeting hub: congress.beonemedicines.com . About Sonrotoclax (BGB-11417) Sonrotoclax is a next-generation and potentially best-in-class investigational B-cell lymphoma 2 (BCL2) inhibitor with a unique pharmacokinetic and pharmacodynamic profile. Studies in the lab and during early drug development have shown that sonrotoclax is a highly potent and specific BCL2 inhibitor with a short half-life and no drug accumulation. Sonrotoclax has shown promising clinical activity across a range of B-cell malignancies and is in development as a monotherapy and in combination with other therapeutics, including BRUKINSA. Notably, in early clinical trials, sonrotoclax plus BRUKINSA has demonstrated rapid and unprecedented undetectable minimal residual disease (uMRD) rates in treatment-naïve patients with CLL. To date, more than 2,200 patients have been enrolled across the broad global development program. The U.S. Food and Drug Administration (FDA) granted Breakthrough Therapy Designation (BTD) for sonrotoclax for the treatment of adult patients with relapsed or refractory (R/R) mantle cell lymphoma (MCL). In addition, the FDA has granted sonrotoclax Fast Track Designation for MCL and Waldenström macroglobulinemia, as well as Orphan Drug Designation for the treatment of adult patients with MCL, WM, multiple myeloma, acute myeloid leukemia, and myelodysplastic syndrome. About BGB-16673 BGB-16673 is a potential first-in-class Bruton’s tyrosine kinase (BTK) protein degrader and is the most advanced protein degrader in the clinic, with nearly 800 patients dosed to date in an extensive global clinical development program. This program includes three randomized Phase 3 trials in R/R CLL, including the head-to-head Phase 3 trial versus pirtobrutinib which began enrolling in Q4 2025. Originating from BeOne’s chimeric degradation activation compound (CDAC) platform, BGB-16673 is designed to promote the degradation, or breakdown, of both wildtype and mutant forms of BTK, including those that commonly result in resistance to BTK inhibitors in patients who experience progressive disease. The U.S. Food and Drug Administration (FDA) granted Fast Track Designation to BGB-16673 for the treatment of adult patients with relapsed or refractory (R/R) chronic lymphocytic leukemia or small lymphocytic lymphoma (CLL/SLL), and adult patients with R/R mantle cell lymphoma (MCL). Additionally, the European Medicines Agency (EMA) granted BGB-16673 PRIority MEdicines (PRIME) designation for the treatment of patients with Waldenstrom’s macroglobulinemia (WM) previously treated with a BTK inhibitor. About BRUKINSA ® (zanubrutinib) BRUKINSA is an orally available, small molecule inhibitor of Bruton’s tyrosine kinase (BTK) designed to deliver complete and sustained inhibition of the BTK protein by optimizing bioavailability, half-life, and selectivity. With differentiated pharmacokinetics compared with other approved BTK inhibitors, BRUKINSA has been demonstrated to inhibit the proliferation of malignant B cells within a number of disease-relevant tissues. BRUKINSA has the broadest label globally of any BTK inhibitor and is the only BTK inhibitor to provide the flexibility of once or twice daily dosing. BRUKINSA is also the only BTK inhibitor to demonstrate superiority to another BTK inhibitor in a Phase 3 study. The global BRUKINSA clinical development program includes about 7,100 patients enrolled in 30 countries and regions across more than 35 trials. BRUKINSA is approved in more than 75 markets, and more than 247,000 patients have been treated globally. Select Important Safety Information Serious adverse reactions, including fatal events, have occurred with BRUKINSA, including hemorrhage, infections, cytopenias, second primary malignancies, cardiac arrhythmias, and hepatotoxicity (including drug-induced liver injury). In the pooled safety population (N=1729), the most common adverse reactions (≥30%), including laboratory abnormalities, in patients who received BRUKINSA were neutrophil count decreased (51%), platelet count decreased (41%), upper respiratory tract infection (38%), hemorrhage (32%), and musculoskeletal pain (31%). Please see full U.S. Prescribing Information including U.S. Patient Information . The information provided in this press release is intended for a global audience. Product indications vary by region. About BeOne BeOne Medicines is a global oncology company domiciled in Switzerland that is discovering and developing innovative treatments that are more accessible to cancer patients worldwide. With a portfolio spanning hematology and solid tumors, BeOne is expediting development of its diverse pipeline of novel therapeutics through its internal capabilities and collaborations. With a growing global team of nearly 12,000 colleagues spanning six continents, the Company is committed to radically improving access to medicines for far more patients who need them. To learn more about BeOne, please visit www.beonemedicines.com and follow us on LinkedIn , X , Facebook and Instagram . Forward-Looking Statement This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995 and other federal securities laws, including statements regarding the potential benefits of BeOne’s product and product candidates; bringing innovative and transformative medicines to patients; and BeOne’s plans, commitments, aspirations and goals under the caption "About BeOne." Actual results may differ materially from those indicated in the forward-looking statements as a result of various important factors, including BeOne’s ability to demonstrate the efficacy and safety of its drug candidates; the clinical results for its drug candidates, which may not support further development or marketing approval; actions of regulatory agencies, which may affect the initiation, timing and progress of clinical trials and marketing approval; BeOne’s ability to achieve commercial success for its marketed medicines and drug candidates, if approved; BeOne's ability to obtain and maintain protection of intellectual property for its medicines and technology; BeOne’s reliance on third parties to conduct drug development, manufacturing, commercialization, and other services; BeOne’s limited experience in obtaining regulatory approvals and commercializing pharmaceutical products; BeOne’s ability to obtain additional funding for operations and to complete the development of its drug candidates and achieve and maintain profitability; and those risks more fully discussed in the section entitled "Risk Factors" in BeOne’s most recent quarterly report on Form 10-Q, as well as discussions of potential risks, uncertainties, and other important factors in BeOne’s subsequent filings with the U.S. Securities and Exchange Commission. All information in this press release is as of the date of this press release, and BeOne undertakes no duty to update such information unless required by law. To access BeOne media resources, please visit our Newsroom . View source version on businesswire.com: https://www.businesswire.com/news/home/20251120303213/en/ Contacts Investor Contact Liza Heapes +1 857-302-5663 [email protected] Media Contact Kyle Blankenship + 667-351-5176 [email protected]

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