CRBP

Obtained FDA clearance to proceed with registrational study (TEMPO-1) of CRB-701 in 2L oropharyngeal cancer and expect to initiate enrollment in September 2026 Concluded last patient last visit in CANYON-1 Phase 1b study (n=240) of CRB-913 in obesity and on track to report data in September 2026 Appointed new Chief Medical Officer, Chief Business Officer, and Board Member to strengthen senior leadership and guide the Company through registrational studies and commercialization readiness NORWOOD, Mass., Aug. 06, 2026 (GLOBE NEWSWIRE) -- Corbus Pharmaceuticals Holdings, Inc. (NASDAQ: CRBP) (“Corbus” or the “Company”), a clinical-stage company focused on developing new therapies in oncology and obesity, today provided a corporate update and reported financial results for the 2026 second quarter ended June 30, 2026. "We’ve continued to build momentum as we prepare for two potentially impactful clinical development milestones in September: commencing enrollment of TEMPO-1, our Phase 3 study of CRB-701 in oropharyngeal cancer, and the data readout of CANYON-1, our Phase 1b study of CRB-913 in obesity. Both programs represent opportunities to address areas of significant unmet medical need,” said Yuval Cohen, Ph.D., Chief Executive Officer of Corbus. “CRB-701 has the potential to bring a much-needed therapeutic option for the growing oropharyngeal cancer patient population, for whom approved and other investigational therapies have shown little promise. CRB-913 is a unique daily oral obesity drug candidate with a mechanism of action entirely orthogonal to the GLP-1 class and with the potential for both weight loss and long-term weight management. We look forward to a productive second half of 2026 as we work to improve patient outcomes and generate meaningful value for shareholders.” Key Corporate and Program Updates CRB-701 is a next-generation, highly stable Nectin-4 targeting antibody drug conjugate (ADC) being developed to treat oropharyngeal squamous cell carcinoma (OPSCC), a type of head and neck squamous cell carcinoma (HNSCC), as well as cervical cancer. The U.S. Food and Drug Administration (FDA) has granted Fast Track designations to CRB-701 for the treatment of both cancer types. CRB-701 is licensed from CSPC Megalith Biopharmaceutical Co. Ltd. China. Obtained FDA clearance to proceed with TEMPO-1 registrational study (n=250) of CRB-701 in 2L OPSCC, representing the first registrational trial specifically designed to evaluate a targeted treatment in this patient population. Expect to commence enrollment in the TEMPO-1 study in September 2026. Reported 2L+ monotherapy data from the Phase 1/2 study of CRB-701 in HNSCC and cervical cancers at the 2026 American Society of Clinical Oncology (ASCO) Annual Meeting. Link here for press release with more details. Anticipate reporting CRB-701 + Keytruda® combination data in first-line (1L) settings in OPSCC patients in Q1 2027 to support potential further registration-enabling trials in the front line. CRB-913 is a highly peripherally restricted oral CB1 inverse agonist for the treatment of obesity. Concluded last patient last visit in the CANYON-1 Phase 1b clinical trial of CRB-913 for the treatment of obesity. The CANYON-1 study followed 240 patients over a 12-week treatment period followed by a 4-week safety follow-up. On track to report topline data from CANYON-1 Phase 1b study in September 2026. Corporate Appointments Corbus strengthened its leadership team and Board of Directors with several key appointments in the second quarter of 2026. Leonardo Viana Nicacio, M.D. as Chief Medical Officer. Dr. Nicacio previously served as Chief Medical Officer at Protara Therapeutics and Senior Vice President, Head of Clinical Development and Global Medical Affairs at Stemline Therapeutics. He also held roles of increasing responsibility at Seagen (acquired by Pfizer), most recently as Vice President of Clinical Development, overseeing programs across a range of cancers, including bladder, breast, gynecologic, lung, colorectal, and head and neck cancers, and most notably the development of a therapeutic for metastatic cervical cancer, TIVDAK®. Nishant Saxena as Chief Business Officer. Mr. Saxena most recently served as Chief Financial Officer at Jeune Aesthetics, Inc., a wholly owned subsidiary of Krystal Biotech, Inc. Previously, he served as a Managing Director in Evercore’s healthcare group, where he advised on transactions totaling over $500 billion in aggregate value. Earlier in his career, Mr. Saxena held positions of increasing responsibility in private equity, venture capital, and investment advisory firms. Brent Pfeiffenberger to Board of Directors. Dr. Pfeiffenberger is currently President and Chief Executive Officer of Century Therapeutics and the Chair of its Board of Directors. Previously, Dr. Pfeiffenberger served as Chief Operating Officer of Neogene Therapeutics (acquired by AstraZeneca). Prior to Neogene, he spent nearly two decades in leadership roles of increasing responsibility at Bristol Myers Squibb, most recently as Senior Vice President, Head of U.S. Oncology, where he oversaw business operations for the multi-billion-dollar franchise. Financial Results for the Quarter Ended June 30, 2026 The Company reported a net loss of approximately $35.0 million, or a net loss per basic and diluted share of $1.81, for the three months ended June 30, 2026, compared to a net loss of approximately $17.7 million, or a net loss per basic and diluted share of $1.44, for the three months ended June 30, 2025. Operating expenses increased by $17.0 million to approximately $36.2 million for the three months ended June 30, 2026, compared to approximately $19.2 million for the three months ended June 30, 2025. The increase was primarily attributable to an increase in clinical development expenses, which includes a $10.0 million development milestone payment pursuant to the licensing agreement for CRB-701. The Company had $117.9 million of cash, cash equivalents, and investments on hand as of June 30, 2026, which is expected to fund operations into 2028 based on current operating plans and planned expenditures. About Corbus Corbus Pharmaceuticals Holdings, Inc. is a clinical-stage company focused on developing new therapies in oncology and obesity and is committed to helping people defeat serious illness by bringing innovative scientific approaches to well-understood biological pathways. Corbus’ pipeline includes CRB-701, a next-generation antibody drug conjugate for the treatment of Nectin-4-expressing tumors and CRB-913, an orally delivered highly peripherally restricted CB1 inverse agonist for the treatment of obesity. Corbus is headquartered in Norwood, Massachusetts. For more information on Corbus, visit corbuspharma.com. Connect with us on X, LinkedIn and Facebook. Forward-Looking Statements This press release contains certain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934 and Private Securities Litigation Reform Act of 1995, as amended, including those relating to the Company’s trial results, product development, clinical and regulatory timelines, including timing for completion of trials and presentation of data, anticipated regulatory interactions and outcomes, including alignment with FDA on trial design, potential accelerated approval market opportunity, competitive position, possible or assumed future results of operations, business strategies, potential growth opportunities, sufficiency of cash runway and other statement that are predictive in nature. These forward-looking statements are based on current expectations, estimates, forecasts and projections about the industry and markets in which we operate and management’s current beliefs and assumptions. These statements may be identified by the use of forward-looking expressions, including, but not limited to, “expect,” “anticipate,” “intend,” “plan,” “believe,” “estimate,” “potential,” “predict,” “project,” “should,” “would” and similar expressions and the negatives of those terms. These statements relate to future events or our financial performance and involve known and unknown risks, uncertainties, and other factors on our operations, clinical development plans and timelines, which may cause actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. Such factors include those set forth in the Company’s filings with the Securities and Exchange Commission including those described in our Annual Report on Form 10-K for the year ended December 31, 2025, and other filings we make with the Securities and Exchange Commission. Prospective investors are cautioned not to place undue reliance on such forward-looking statements, which speak only as of the date of this press release. The Company undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future events or otherwise, except as required by law. All product names, logos, brands and company names are trademarks or registered trademarks of their respective owners.  Their use does not imply affiliation or endorsement by these companies. INVESTOR CONTACTS:  Sean Moran Chief Financial Officer Corbus Pharmaceuticals [email protected] Dan Ferry Managing Director LifeSci Advisors, LLC [email protected] MEDIA CONTACT:Liz MeloneFounder & PrincipalMelone Communications, [email protected] ---tables to follow---

Reached broad alignment with the FDA on the registration path for CRB-701 for 2L treatment in head and neck squamous cell carcinoma (HNSCC) and cervical cancer with CRB-701 Announced presentation of updated CRB-701 data in HNSCC and cervical cancer at ASCO 2026 Completed enrollment in 16-week study CANYON-1 study (n=240) of CRB-913 for the treatment of obesity with topline data on track to report this summer NORWOOD, Mass., May 12, 2026 (GLOBE NEWSWIRE) -- Corbus Pharmaceuticals Holdings, Inc. (NASDAQ: CRBP) (“Corbus” or the “Company”), a clinical-stage company focused on developing promising new therapies in oncology and obesity, today provided a corporate update and reported financial results for the 2026 first quarter ended March 31, 2026. "We’ve continued to build strong momentum with CRB-701 and CRB-913, setting the stage for rapidly approaching inflection points for both the oncology and obesity programs,” said Yuval Cohen, Ph.D., Chief Executive Officer of Corbus. “Having reached broad alignment with the FDA, we’re on track to start a registrational study for CRB-701 in second-line HNSCC this summer. We’ll report updated data at ASCO 2026 that will provide clear insight into CRB-701's differentiated profile in 2L HNSCC and its upcoming registrational study. We’ll also present updated data in 2L cervical cancer, a patient population with few treatment options. Turning to obesity, we have reached last patient/first visit in our CANYON-1 Phase 1b study and are on schedule to report 16-week, 240-patient data for CRB-913 this summer. CRB-913 represents a unique oral obesity drug with a non-GLP-1 and non-incretin mechanism of action and has the potential for weight loss and long-term weight management. We’re excited about CRB-913's promise to deliver an orthogonal drug class into the obesity treatment landscape.” Key Corporate and Program Updates CRB-701 is a next-generation, highly stable Nectin-4 targeting antibody drug conjugate (ADC) being developed to treat HNSCC and cervical cancer. The U.S. Food and Drug Administration (FDA) has granted Fast Track designations to CRB-701 for the treatment of both cancer types. CRB-701 is licensed from CSPC Megalith Biopharmaceutical Co. Ltd. China. Announced broad alignment with the FDA on the registration path for CRB-701 in HNSCC and cervical cancers and continued interactions with the FDA to finalize the protocols and statistical analysis plans for the registrational studies. Anticipated catalysts for CRB-701 in 2026: Report monotherapy data from the Phase 1/2 study of CRB-701 in both HNSCC and cervical cancers at the upcoming 2026 American Society of Clinical Oncology (ASCO) annual meeting. Link here for press release with more details. Initiate a registrational study for CRB-701 in second-line HNSCC this summer. Report CRB-701 + Keytruda® combination data in first-line HNSCC patients in early Q1 2027 to support potential further registration-enabling trials. CRB-913 is a highly peripherally restricted oral CB1 inverse agonist for the treatment of obesity. Completed enrollment of last patient and completion of the first clinical visit in the Company’s CANYON-1 Phase 1b clinical trial of CRB-913 for the treatment of obesity. The CANYON-1 study follows patients over a 12-week treatment period followed by a 4-week safety follow-up and is on track to be completed in the summer of 2026. Anticipated catalyst for CRB-913 in 2026: Report topline CANYON-1 Phase 1b dose-ranging 16-week study (n=240) in summer 2026. Financial Results for the Quarter Ended March 31, 2026 The Company reported a net loss of approximately $23.0 million, or a net loss per basic and diluted share of $1.23, for the three months ended March 31, 2026, compared to a net loss of approximately $17.0 million, or a net loss per basic and diluted share of $1.39, for the three months ended March 31, 2025. Operating expenses increased by $4.5 million to approximately $24.3 million for the three months ended March 31, 2026, compared to approximately $19.8 million for the three months ended March 31, 2025. The increase was primarily attributable to an increase in clinical development expenses. The Company had $138.2 million of cash, cash equivalents, and investments on hand as of March 31, 2026, which is expected to fund operations into 2028 based on current operating plans and planned expenditures. About Corbus Corbus Pharmaceuticals Holdings, Inc. is a clinical-stage company focused on developing promising new therapies in oncology and obesity and is committed to helping people defeat serious illness by bringing innovative scientific approaches to well-understood biological pathways. Corbus’ pipeline includes CRB-701, a next-generation antibody drug conjugate for the treatment of Nectin-4-expressing tumors and CRB-913, an orally delivered highly peripherally restricted CB1 inverse agonist for the treatment of obesity. Corbus is headquartered in Norwood, Massachusetts. For more information on Corbus, visit corbuspharma.com. Connect with us on X, LinkedIn and Facebook. Forward-Looking Statements This press release contains certain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934 and Private Securities Litigation Reform Act of 1995, as amended, including those relating to the Company’s trial results, product development, clinical and regulatory timelines, including timing for completion of trials and presentation of data, anticipated regulatory interactions and outcomes, market opportunity, competitive position, possible or assumed future results of operations, business strategies, potential growth opportunities, sufficiency of cash runway and other statement that are predictive in nature. These forward-looking statements are based on current expectations, estimates, forecasts and projections about the industry and markets in which we operate and management’s current beliefs and assumptions. These statements may be identified by the use of forward-looking expressions, including, but not limited to, “expect,” “anticipate,” “intend,” “plan,” “believe,” “estimate,” “potential,” “predict,” “project,” “should,” “would” and similar expressions and the negatives of those terms. These statements relate to future events or our financial performance and involve known and unknown risks, uncertainties, and other factors on our operations, clinical development plans and timelines, which may cause actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. Such factors include those set forth in the Company’s filings with the Securities and Exchange Commission including those described in our Annual Report on Form 10-K for the year ended December 31, 2025. Prospective investors are cautioned not to place undue reliance on such forward-looking statements, which speak only as of the date of this press release. The Company undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future events or otherwise, except as required by law. All product names, logos, brands and company names are trademarks or registered trademarks of their respective owners. Their use does not imply affiliation or endorsement by these companies. INVESTOR CONTACTS: Sean Moran Chief Financial Officer Corbus Pharmaceuticals [email protected] Dan Ferry Managing Director LifeSci Advisors, LLC [email protected] MEDIA CONTACT: Liz Melone Founder & Principal Melone Communications, LLC [email protected] ---tables to follow---

Presented data at ESMO 2025 demonstrating promising efficacy with CRB-701 in head and neck squamous cell carcinoma (HNSCC) and cervical cancer CRB-701 data for both indications is expected in mid-2026 with focus on durability and patient stratification Reported 14-day CRB-913 SAD/MAD data demonstrating potent and rapid weight loss of 2.9% with favorable GI safety On schedule to complete 12-week CRB-913 obesity study (n=240) in summer 2026 Completed $75 million public offering in Q4 2025 extending cash runway into 2028 NORWOOD, Mass., March 09, 2026 (GLOBE NEWSWIRE) -- Corbus Pharmaceuticals Holdings, Inc. (NASDAQ: CRBP) (“Corbus” or the “Company”), a clinical stage company focused on promising new therapies in oncology and obesity, today provided a corporate update and reported financial results for the fourth quarter and year ended December 31, 2025. "Our encouraging data readouts for CRB-701 and CRB-913 in the fourth quarter of 2025 set the stage for a potentially transformative 2026. This summer we anticipate key data readouts for both programs that we expect will elucidate their differentiated efficacy and safety profiles, as well as potential clinical utility and commercial opportunities,” said Yuval Cohen, Ph.D., Chief Executive Officer of Corbus. “The clinical responses we are generating in HNSCC and cervical cancer patients with CRB-701, a highly stable Nectin-4 ADC, highlight its potential in treating these challenging tumor types. In parallel, the rapid weight loss and favorable GI tolerability we’ve seen with CRB-913 suggest it could provide a novel long-term weight management solution for people struggling with chronic obesity.” Key Corporate and Program Updates CRB-701 is a next-generation, highly stable Nectin-4 targeting ADC being developed to treat HNSCC and cervical cancer. The U.S. Food and Drug Administration (FDA) has granted Fast Track designations to CRB-701 for the treatment of both cancer types. CRB-701 is licensed from CSPC Megalith Biopharmaceutical Co. Ltd. China. Encouraging CRB-701 Phase 1/2 data in Q4 2025. Corbus presented dose optimization data at the 2025 European Society for Medical Oncology Congress (ESMO 2025). Highlights included: Unconfirmed Objective Response Rate with CRB-701 at the 3.6 mg/kg dose: HNSCC - 47.6%, Cervical cancer - 37.5%, and Bladder - 55.6%. Favorable safety and tolerability with no grade 4 or 5 treatment-related adverse events. Markedly low levels of peripheral neuropathy and skin toxicity. Link here for CRB-701 ESMO data press release and here for archived KOL event discussing the findings. Anticipated catalysts for CRB-701 in 2026: Provide update in Q1 2026 from discussions with FDA regarding registrational study protocols for HNSCC and cervical cancer. Report monotherapy data in mid-2026 with a key focus being durability data and patient stratification. Generate CRB-701 + Keytruda combination data in first line (“1L”) HNSCC patients in Q4 2026. CRB-913 is a highly peripherally restricted oral CB1 inverse agonist for the treatment of obesity. Encouraging CRB-913 data in Q4 2025. Corbus completed a single ascending dose (SAD) and multiple ascending dose (MAD) Phase 1a study in December 2025. SAD portion: n=64 across 8 cohorts; MAD portion: n=48 across 4 cohorts. Highest SAD dose tested was 600 mg/day and highest MAD dose tested was 150 mg/day. Highlights include: Weight loss of 2.9% (placebo adjusted) at 14-days in dedicated 150 mg/day obesity cohort (n=12). Weight loss started early and deepened with time. Safe and well-tolerated across all cohorts and all doses studied. Very favorable GI profile with no reports of vomiting, constipation or nausea. Daily neuropsychiatric assessments using CSSRS, PHQ-9, and GAD-7 were negative. Link here for Phase 1a study data press release and here for archived KOL event discussing the findings. Anticipated catalyst for CRB-913 in 2026: CANYON-1 Phase 1b dose-ranging 12-week study (n=240) expected to be completed in summer 2026. CRB-601 is an anti-αvβ8 integrin monoclonal antibody (mAB) designed to block the activation of latent TGFβ in the tumor micro-environment to treat solid tumors. Phase 1 dose escalation trial of CRB-601 completed in Q4 2025. Preliminary monotherapy data were presented in November 2025 at the Society for Immunotherapy of Cancer (SITC) 2025. Corbus has deprioritized this program and does not plan to enroll additional patients. Financial Results for the Quarter and Year Ended December 31, 2025 The Company reported a net loss of approximately $20.6 million, or a net loss per basic and diluted share of $1.25, for the three months ended December 31, 2025, compared to a net loss of $9.5 million, or a net loss per basic and diluted share of $0.78, for the three months ended December 31, 2024. Operating expenses increased by $9.4 million to approximately $22.0 million for the three months ended December 31, 2025, compared to approximately $12.6 million for the three months ended December 31, 2024. The increase was primarily attributable to an increase in clinical development expenses. The Company had $163.3 million of cash, cash equivalents, and investment on hand at December 31, 2025, which is expected to fund operations into 2028 based on planned expenditures. In the fourth quarter of 2025, the Company completed a public offering that raised a total of $75 million in gross proceeds. About Corbus Corbus Pharmaceuticals Holdings, Inc. is a clinical stage company focused on promising new therapies in oncology and obesity and is committed to helping people defeat serious illness by bringing innovative scientific approaches to well-understood biological pathways. Corbus’ pipeline includes CRB-701, a next-generation antibody drug conjugate that targets the expression of Nectin-4 on cancer cells to release a cytotoxic payload and CRB-913, a highly peripherally restricted CB1 receptor inverse agonist for the treatment of obesity. Corbus is headquartered in Norwood, Massachusetts. For more information on Corbus, visit corbuspharma.com. Connect with us on X, LinkedIn and Facebook. Forward-Looking Statements This press release contains certain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934 and Private Securities Litigation Reform Act, as amended, including those relating to the Company’s trial results, product development, clinical and regulatory timelines, including timing for completion of trials and presentation of data, market opportunity, competitive position, possible or assumed future results of operations, business strategies, potential growth opportunities and other statement that are predictive in nature. These forward-looking statements are based on current expectations, estimates, forecasts and projections about the industry and markets in which we operate and management’s current beliefs and assumptions. These statements may be identified by the use of forward-looking expressions, including, but not limited to, “expect,” “anticipate,” “intend,” “plan,” “believe,” “estimate,” “potential,” “predict,” “project,” “should,” “would” and similar expressions and the negatives of those terms. These statements relate to future events or our financial performance and involve known and unknown risks, uncertainties, and other factors on our operations, clinical development plans and timelines, which may cause actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. Such factors include those set forth in the Company’s filings with the Securities and Exchange Commission. Prospective investors are cautioned not to place undue reliance on such forward-looking statements, which speak only as of the date of this press release. The Company undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future events or otherwise. All product names, logos, brands and company names are trademarks or registered trademarks of their respective owners. Their use does not imply affiliation or endorsement by these companies. INVESTOR CONTACTS: Sean Moran Chief Financial Officer Corbus Pharmaceuticals [email protected] Dan Ferry Managing Director LifeSci Advisors, LLC [email protected] MEDIA CONTACT: Liz Melone Founder & Principal Melone Communications, LLC [email protected] ---tables to follow---

CRB-913 was safe and well-tolerated across all doses studied Daily neuropsychiatric assessments using CSSRS, PHQ-9, and GAD-7 were negative for all participants A placebo-adjusted mean weight loss of 2.9% was observed at Day 14 in a dedicated cohort of people with obesity (n=12) A 12-week dose-finding study in people with obesity initiated with completion expected in summer 2026 Company to host conference call and live webcast today at 8:00 am ET NORWOOD, Mass., Dec. 11, 2025 (GLOBE NEWSWIRE) -- Corbus Pharmaceuticals Holdings Inc. (NASDAQ: CRBP), a clinical-stage company focused on oncology and obesity, today announced the completion of the single ascending dose (SAD) and multiple ascending dose (MAD) Phase 1a study of CRB-913 and the initiation of a Phase 1b dose-range finding study ("CANYON-1"), with completion expected in summer 2026. CRB-913 is a highly peripherally restricted oral small molecule CB1 inverse agonist targeting chronic obesity management. The double-blinded placebo-controlled SAD/MAD Phase 1a study, conducted in the United States, assessed the safety, tolerability, and pharmacokinetics (PK) of escalating once-daily doses of CRB-913. The SAD portion of the study (n=64) comprised 8 cohorts that received ascending doses of CRB-913 (maximal dose of 600 mg/day) or placebo dosed orally once (2 placebo and 6 CRB-913 per cohort). Seven of the SAD cohorts enrolled healthy participants (mean BMI=28), and one enrolled people with obesity (mean BMI=36). The MAD portion of the study (n=48) comprised 4 cohorts who received ascending doses of CRB-913 (25 mg, 75 mg or 150 mg) or placebo orally once daily (3 placebo and 9 CRB-913-treated per cohort) over 7 days and followed by a further 7 days of continuous, in-clinic observation. Three of the MAD cohorts enrolled healthy participants and one enrolled people with obesity. Safety, Tolerability and PK No serious treatment-emergent adverse events were reported in the SAD/MAD study. CRB-913 was not associated with GI intolerability. There were no reported cases of nausea, vomiting, or constipation and only a single case of mild diarrhea. Daily neuropsychiatric assessments using the Columbia-Suicide Severity Rating Scale (CSSRS), the Patient Health Questionnaire-9 (PHQ-9), and the General Anxiety Disorder-7 (GAD-7) questionnaires remained stable and negative at all time points for all participants. No cases of suicidality, depression, or insomnia were reported in the study. No neuropsychiatric adverse events were noted in any of the cohorts of non-obese participants. Three adverse events of mild anxiety and one of mild irritability were reported in the obese MAD cohort at 150 mg/day. None of these events was accompanied by suicidality, depression, dysphoria, or insomnia. They were all transient, and symptoms resolved completely without need for medical intervention. The PK profile for CRB-913 was established and was found to be suitable for a once-daily oral dosing. Efficacy In the dedicated obese MAD cohort (150 mg QD), all CRB-913-treated participants (n=9), and none in the placebo group (n=3), experienced weight loss. The CRB-913-treated participants achieved a mean 2.9% placebo-adjusted weight loss by Day 14. Individual participant weight loss ranged from 1.3% to 4.3%. Weight loss started early and deepened with time. Notably, several participants treated with CRB-913 reported reduction in food-related thoughts and cravings. Placebo-adjusted weight loss was also seen in healthy, non-obese participants in the 75 mg and 150 mg MAD cohorts. "We are pleased by the translation of CRB-913 from pre-clinical models to the clinical setting," said Yuval Cohen, PhD, Chief Executive Officer of Corbus. "We are encouraged by CRB-913’s potentially class-leading safety and tolerability profile demonstrated in this study. CRB-913’s observed weight loss effect provides further evidence that a markedly peripherally restricted CB1 inverse agonist could offer an attractive orthogonal monotherapy for obesity or combinatory mode of action to the incretin-pathway therapies. We look forward to completing the now-initiated 12-week Phase 1b CANYON-1 obesity study in summer 2026." Conference Call and Live Webcast: Corbus will host a conference call and live webcast today at 8:00 am ET to review and discuss the Phase 1a data. To register for the webinar, click here. A replay will be available on the Corbus website. Joining the Company on the conference call to provide KOL expert discussion of the data will be Sarah Barenbaum, MD and Daniel Lee, MD. Dr. Barenbaum is Assistant Professor of Clinical Medicine at Weill Cornell Medical College and an Assistant Attending Physician at New York-Presbyterian Hospital. She specializes in the care of patients with obesity and weight-related medical complications. Dr. Lee is a Board-certified psychiatrist who was responsible for the psychiatric screening and evaluations of participants in the CRB-913 Phase 1a study. He has extensive background in both clinical and industry settings, including direct patient care, psychiatric assessments, and medical oversight. About the CANYON-1 CRB-913 Phase 1b Clinical Trial The Phase 1b, 12-week study is a double-blind, placebo-controlled, dose-ranging study in 240 obese, non-diabetic participants being conducted at multiple clinical sites in the United States. It will include a placebo cohort and 3 CRB-913 cohorts of 20 mg, 40 mg, and 60 mg dosed orally once daily (QD). A dose titration regimen is included in the design, with all CRB-913 participants commencing at 20 mg/day and then titrating up to either 40 mg/day or beyond that to 60 mg/day, depending on their respective cohorts. About CRB-913 CRB-913 is an oral small molecule inverse agonist of the G-protein Coupled Receptor (GPCR) cannabinoid type-1 (CB1). This is a recognized mechanism of action for weight loss, but the first generation of experimental drugs in this class was abandoned due to potential neuropsychiatric adverse event risks. CRB-913 is a highly peripherally restricted CB1 inverse agonist designed to have reduced brain penetration. Pre-clinical models have shown CRB-913 to be 15-fold less brain-penetrant than monlunabant (another experimental CB1 inverse agonist) and to have 50 times lower brain:plasma ratio than rimonabant (an extensively studied first-generation CB1 inverse agonist). About Corbus Corbus Pharmaceuticals Holdings, Inc. is a clinical stage oncology and obesity company with a diversified portfolio and is committed to helping people defeat serious illness by bringing innovative scientific approaches to well understood biological pathways. Corbus’ pipeline includes CRB-701, a next generation antibody drug conjugate that targets the expression of Nectin-4 on cancer cells to release a cytotoxic payload; CRB-601, an anti-integrin monoclonal antibody which blocks the activation of TGFβ expressed on cancer cells; and CRB-913, a highly peripherally restricted CB1 inverse agonist for the treatment of obesity. Corbus is headquartered in Norwood, Massachusetts. For more information on Corbus, visit corbuspharma.com and our Corporate Presentation here. Connect with us on X, LinkedIn and Facebook. Forward-Looking Statements This press release contains certain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934 and Private Securities Litigation Reform Act, as amended, including those relating to the Company's restructuring, trial results, product development, clinical and regulatory timelines, market opportunity, competitive position, possible or assumed future results of operations, business strategies, potential growth opportunities and other statement that are predictive in nature. These forward-looking statements are based on current expectations, estimates, forecasts and projections about the industry and markets in which we operate and management's current beliefs and assumptions. These statements may be identified by the use of forward-looking expressions, including, but not limited to, "expect," "anticipate," "intend," "plan," "believe," "estimate," "potential,” "predict," "project," "should," "would" and similar expressions and the negatives of those terms. These statements relate to future events or our financial performance and involve known and unknown risks, uncertainties, and other factors on our operations, clinical development plans and timelines, which may cause actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. Such factors include those set forth in the Company's filings with the Securities and Exchange Commission. Prospective investors are cautioned not to place undue reliance on such forward-looking statements, which speak only as of the date of this press release. The Company undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future events or otherwise. All product names, logos, brands and company names are trademarks or registered trademarks of their respective owners. Their use does not imply affiliation or endorsement by these companies.

Company will host conference call and live webcast to review and discuss the data at 8:00 am ET NORWOOD, Mass., Dec. 10, 2025 (GLOBE NEWSWIRE) -- Corbus Pharmaceuticals Holdings Inc. (NASDAQ: CRBP), a clinical stage company focused on oncology and obesity, announced the Company’s plan to release results of its Phase 1a single ascending dose (SAD) and multiple ascending dose (MAD) study of CRB-913 prior to the market open on Thursday, December 11, 2025. Corbus will host a conference call and live webcast the same day at 8:00 am ET to review and discuss the Phase 1a data. To register for the webcast, click here . A replay will be available on the Corbus website. About CRB-913 CRB-913 is an oral small molecule inverse agonist of the G-protein Coupled Receptor (GPCR) cannabinoid type-1 (CB1). This is a recognized mechanism of action for weight loss, but the first generation of experimental drugs in this class was abandoned due to potential neuropsychiatric adverse event risks. CRB-913 is a highly peripherally restricted CB1 inverse agonist designed to have reduced brain penetration. Preclinical models have shown CRB-913 to be 15-fold less brain-penetrant than monlunabant (another experimental CB1 inverse agonist) and to have 50 times lower brain:plasma ratio than rimonabant (an extensively studied first-generation CB1 inverse agonist). About Corbus Corbus Pharmaceuticals Holdings, Inc. is a clinical-stage company focused on oncology and obesity and is committed to helping people defeat serious illness by bringing innovative scientific approaches to well-understood biological pathways. Corbus’ pipeline includes CRB-701, a next-generation antibody drug conjugate that targets the expression of Nectin-4 on cancer cells to release a cytotoxic payload, CRB-601, an anti-integrin monoclonal antibody that blocks the activation of TGFβ expressed on cancer cells, and CRB-913, a highly peripherally restricted CB1 receptor inverse agonist for the treatment of obesity. Corbus is headquartered in Norwood, Massachusetts. For more information on Corbus, visit corbuspharma.com. Connect with us on X, LinkedIn and Facebook. Forward-Looking Statements This press release contains certain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934 and Private Securities Litigation Reform Act, as amended, including those relating to the Company’s trial results, product development, clinical and regulatory timelines, including timing for completion of trials and presentation of data, market opportunity, competitive position, possible or assumed future results of operations, business strategies, potential growth opportunities and other statements that are predictive in nature. These forward-looking statements are based on current expectations, estimates, forecasts and projections about the industry and markets in which we operate and management’s current beliefs and assumptions. These statements may be identified by the use of forward-looking expressions, including, but not limited to, “expect,” “anticipate,” “intend,” “plan,” “believe,” “estimate,” “potential,” “predict,” “project,” “should,” “would” and similar expressions and the negatives of those terms. These statements relate to future events or our financial performance and involve known and unknown risks, uncertainties, and other factors on our operations, clinical development plans and timelines, which may cause actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. Such factors include those set forth in the Company’s filings with the Securities and Exchange Commission. Prospective investors are cautioned not to place undue reliance on such forward-looking statements, which speak only as of the date of this press release. The Company undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future events or otherwise. All product names, logos, brands and company names are trademarks or registered trademarks of their respective owners. Their use does not imply affiliation or endorsement by these companies. INVESTOR CONTACTS: Sean Moran Chief Financial Officer Corbus Pharmaceuticals [email protected] Dan Ferry Managing Director LifeSci Advisors, LLC [email protected]

Presented robust CRB-701 clinical data at ESMO 2025 - 3.6 mg/kg dose generated ORR of 47.6% in HNSCC, 37.5% in cervical cancer and 55.6% in mUC CRB-701 HNSCC registrational study planned to start mid-2026 Completed $75 million public offering, extending cash runway into 2028 Expected to complete CRB-913 SAD/MAD study and initiate Ph1b study in obese patients in Q4 2025 NORWOOD, Mass., Nov. 12, 2025 (GLOBE NEWSWIRE) -- Corbus Pharmaceuticals Holdings, Inc. (NASDAQ: CRBP) (“Corbus” or the “Company”), a clinical stage oncology and obesity company, today provided a corporate update and reported financial results for the quarter ended September 30, 2025. “This has been a productive period for Corbus, led by the presentation of CRB-701 data at ESMO 2025,” said Yuval Cohen, Ph.D., Chief Executive Officer of Corbus. “We are encouraged by the clinical responses observed in HNSCC and cervical cancer from a patient population that was heavily pre-treated with other therapies and look forward to aligning with the FDA to find the most expedient path forward. We also continue to advance our CB1 inverse agonist, CRB-913, for the treatment of obesity and expect to report SAD/MAD data and initiate a Phase 1b dose-ranging study in obese, non-diabetic patients before the end of 2025. Finally with the closing of a $75 million public offering this month, our cash position is strong and will fund operations into 2028.” Key Corporate and Program Updates CRB-701 for the treatment of solid tumors, is a next-generation antibody drug conjugate (ADC) targeting Nectin-4 that contains a site-specific, cleavable linker and a precise drug antibody ratio (DAR) of 2 using monomethyl auristatin E (MMAE) as the payload. Dose optimization data from the Phase 1/2 study was presented as a poster at the 2025 European Society for Medical Oncology Congress (ESMO 2025). The Company also hosted a KOL event during ESMO 2025 to review and discuss the data. The event featured insights from leading HNSCC experts: Ari Rosenberg, MD – University of Chicago, Glenn Hanna, MD – Dana-Farber Cancer Institute, and Cesar Augusto Perez Batista, MD – Sarah Cannon Research Institute. Efficacy Data presented at ESMO 2025 demonstrated an objective response rate (ORR) of 33.3% and corresponding disease control rate (DCR) of 75.0% for HNSCC at 2.7 mg/kg and an ORR of 47.6% and corresponding DCR of 61.9% for the 3.6 mg/kg. Clinical responses were seen in patients pre-treated with EGFR inhibitors, including petosemtamab and cetuximab. Clinical responses were seen even in patients with low Nectin-4 expressions in line with the differentiated mechanism of action of CRB-701. Early clinical efficacy signals in cervical and bladder cancer appear encouraging with ORRs at 3.6 mg/kg of 37.5% and 55.6%, respectively. Safety Overall, CRB-701 demonstrated a favorable safety and tolerability profile with no grade 4 or 5 treatment- related adverse events. The most common treatment emergent adverse events (TEAEs) at a frequency of >15% were dysgeusia (18.6%), anemia (21.0%), fatigue (21.6%), alopecia (24.0%) and keratitis (32.3%). Grade 3 treatment-related adverse events were reported in 18.0% of patients. Notably, the rate of peripheral neuropathy was low at 8.4% (all Grade 1 or 2), based on a broad, standardized MedRA category search. The discontinuation rate related to CRB-701 was low at 6.0%. The Company plans to meet with the U.S. Food and Drug Administration (FDA) in the first quarter of 2026 to review the data and expects to initiate a Phase 2/3 registrational study by mid-2026. The FDA has granted Fast Track designations to CRB-701 for the treatment of HNSCC and relapsed or refractory metastatic cervical cancer. CRB-913 is a second generation, highly peripherally restricted, oral small molecule CB1 receptor inverse agonist drug candidate designed for the treatment of obesity. CB1 inverse agonism is a clinically validated mechanism to induce weight loss but the previous class of such drug candidates was abandoned due to potential neuropsychiatric adverse event risks. CRB-913 is a member of a new class of peripherally restricted CB1 inverse agonists designed to have reduced brain penetration. The Company is on track to complete the CRB-913 single ascending dose and multiple ascending dose (SAD/MAD) study and to initiate Phase 1b study in obese, non-diabetic patients by the end of this year. CRB-913’s pre-clinical data demonstrates CRB-913 is markedly more peripherally restricted than either monlunabant or rimonabant. CRB-913 has a brain-to-plasma ratio 50 times lower than rimonabant and is 15 times more peripherally restricted than monlunabant. CRB-601 is a potent and selective anti-αvβ8 integrin monoclonal antibody (mAB) designed to block the activation of latent TGFβ in the tumor micro-environment to treat solid tumors. The first participant was dosed in December 2024 and the Phase 1 dose escalation study is ongoing. A study-in-progress poster was presented at the 2025 Society for Immunotherapy of Cancer (SITC). Financial Results for the Quarter Ended September 30, 2025 The Company reported a net loss of approximately $23.3 million, or a net loss per basic and diluted share of $1.90, for the three months ended September 30, 2025, compared to a net loss of $13.8 million, or a net loss per basic and diluted share of $1.15, for the three months ended September 30, 2024. Operating expenses increased by $8.9 million to approximately $24.4 million for the three months ended September 30, 2025, compared to approximately $15.5 million for the three months ended September 30, 2024. The increase was primarily attributable to an increase in clinical development expenses. As of September 30, 2025, the Company had $104.0 million of cash, cash equivalents, and investment on hand. Since the end of the third quarter ended September 30, 2025, the Company raised a total of $73.8 million in net proceeds from the issuance of 4,976,510 shares of common stock from an underwritten public offering and ATM sales. The Company believes it has sufficient cash to fund operations into 2028 based on current operating plans and assumptions regarding clinical timelines and planned expenditures. About Corbus Corbus Pharmaceuticals Holdings, Inc. is a clinical stage oncology and obesity company and is committed to helping people defeat serious illness by bringing innovative scientific approaches to well-understood biological pathways. Corbus’ pipeline includes CRB-701, a next-generation antibody drug conjugate that targets the expression of Nectin-4 on cancer cells to release a cytotoxic payload; CRB-601, an anti-integrin monoclonal antibody that blocks the activation of TGFβ expressed on cancer cells; and CRB-913, a highly peripherally restricted CB1 receptor inverse agonist for the treatment of obesity. Corbus is headquartered in Norwood, Massachusetts. For more information on Corbus, visit corbuspharma.com. Connect with us on X, LinkedIn and Facebook. Forward-Looking Statements This press release contains certain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934 and Private Securities Litigation Reform Act, as amended, including those relating to the Company’s trial results, product development, clinical and regulatory timelines, including timing for completion of trials and presentation of data, market opportunity, competitive position, possible or assumed future results of operations, business strategies, potential growth opportunities and other statement that are predictive in nature. These forward-looking statements are based on current expectations, estimates, forecasts and projections about the industry and markets in which we operate and management’s current beliefs and assumptions. These statements may be identified by the use of forward-looking expressions, including, but not limited to, “expect,” “anticipate,” “intend,” “plan,” “believe,” “estimate,” “potential,” “predict,” “project,” “should,” “would” and similar expressions and the negatives of those terms. These statements relate to future events or our financial performance and involve known and unknown risks, uncertainties, and other factors on our operations, clinical development plans and timelines, which may cause actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. Such factors include those set forth in the Company’s filings with the Securities and Exchange Commission. Prospective investors are cautioned not to place undue reliance on such forward-looking statements, which speak only as of the date of this press release. The Company undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future events or otherwise. All product names, logos, brands and company names are trademarks or registered trademarks of their respective owners. Their use does not imply affiliation or endorsement by these companies. INVESTOR CONTACTS: Sean Moran Chief Financial Officer Corbus Pharmaceuticals [email protected] Dan Ferry Managing Director LifeSci Advisors, LLC [email protected]

Phase 1/2 dose expansion data for Nectin-4 targeting ADC CRB-701 to be presented at ESMO 2025 Initiated 7-day MAD portion of Phase 1 study for obesity drug CRB-913 All three clinical programs (CRB-701, CRB-913, CRB-601) on track for data readouts in the second half of 2025 NORWOOD, Mass., Aug. 05, 2025 (GLOBE NEWSWIRE) -- Corbus Pharmaceuticals Holdings, Inc. (NASDAQ: CRBP) (“Corbus” or the “Company”), a clinical stage oncology and obesity company, today provided a corporate update and reported financial results for the quarter ended June 30, 2025. “The second half of 2025 is shaping up to be impactful, with scheduled data readouts anticipated for all three of our clinical programs,” said Yuval Cohen, Ph.D., Chief Executive Officer of Corbus. “We have been very pleased with the strong rate of enrollment in the CRB-701 study and look forward to presenting the Phase 1/2 dose expansion data at ESMO in October, which will include data from over 100 participants from the U.S. and Europe with HNSCC, cervical and mUC tumors. For our obesity drug CRB-913, we expect to present SAD/MAD data later this year and to initiate a Phase 1b dose-range finding study in the fourth quarter of 2025.” Key Corporate and Program Updates CRB-701 for the treatment of solid tumors, is a next-generation antibody drug conjugate (ADC) targeting Nectin-4 that contains a site-specific, cleavable linker and a precise drug antibody ratio (DAR) of 2 using monomethyl auristatin E (MMAE) as the payload. Dose optimization in the Phase 1/2 study is on-going with dosing at 2.7 mg/kg and 3.6 mg/kg in participants with head and neck squamous cell carcinoma (HNSCC), cervical and urothelial (mUC) tumors. In June 2025, the first participant in the combination arm of the study was dosed with pembrolizumab. Phase 1/2 dose expansion data will be presented for the first time as a poster (#967P) at the European Society for Medical Oncology (ESMO) Congress on October 19, 2025 from 12:00-12:45 CEST. The Company expects to complete dose optimization and identify the recommended Phase 2 dose (RP2D) in the fourth quarter of 2025. The U.S. Food and Drug Administration (FDA) has granted Fast Track designation to CRB-701 for the treatment of relapsed or refractory metastatic cervical cancer. CRB-913 is a second generation, highly peripherally restricted, oral small molecule CB1 receptor inverse agonist drug designed for the treatment of obesity. CB1 inverse agonism is a clinically validated mechanism to induce weight loss but the previous class of such experimental drugs was abandoned due to potential neuropsychiatric adverse event risks. CRB-913 is a member of a new class of peripherally restricted CB1 inverse agonists designed to have reduced brain penetration. The Company initiated the multiple ascending dose (MAD) portion of the Phase 1 trial in June 2025. This follows safety and pharmacokinetics (PK) data analysis of the single ascending dose (SAD) portion of the study launched in March 2025. No treatment-related neuropsychiatric events have been seen to date in the SAD portion of the study. The MAD portion of the study is scheduled for completion in the third quarter, and the Company expects to report SAD/MAD data later this year. The initiation of Phase 1b dose-range finding study in obese non-diabetic individuals is on track for Q4 2025. The Company’s pre-clinical data demonstrates CRB-913 is markedly more peripherally restricted than either monlunabant or rimonabant. CRB-913 has a brain to plasma ratio 50-times lower than rimonabant and is 15-times more peripherally restricted than monlunabant. CRB-601 is a potent and selective anti-αvβ8 integrin monoclonal antibody (mAB) designed to block the activation of latent TGFβ in the tumor micro-environment to treat solid tumors. The first participant was dosed in December 2024 in the dose escalation monotherapy portion of a Phase 1 study which is being conducted in the U.S. and Europe. The Company is on track to report dose escalation data in Q4 2025. Financial Results for the Quarter Ended June 30, 2025 The Company reported a net loss of approximately $17.7 million, or a net loss per basic and diluted share of $1.44, for the three months ended June 30, 2025, compared to a net loss of $10.0 million, or a net loss per basic and diluted share of $0.90, for the three months ended June 30, 2024. Operating expenses increased by $8.2 million to approximately $19.2 million for the three months ended June 30, 2025, compared to approximately $11.0 million for the three months ended June 30, 2024. The increase was primarily attributable to an increase in clinical development expenses. As of June 30, 2025, the Company had $116.6 million of cash, cash equivalents, and investment on hand, which is expected to fund operations through Q2 2027 based on planned expenditures. About Corbus Corbus Pharmaceuticals Holdings, Inc. is a clinical stage oncology and obesity company and is committed to helping people defeat serious illness by bringing innovative scientific approaches to well-understood biological pathways. Corbus’ pipeline includes CRB-701, a next-generation antibody drug conjugate that targets the expression of Nectin-4 on cancer cells to release a cytotoxic payload, CRB-601, an anti-integrin monoclonal antibody that blocks the activation of TGFβ expressed on cancer cells, and CRB-913, a highly peripherally restricted CB1 receptor inverse agonist for the treatment of obesity. Corbus is headquartered in Norwood, Massachusetts. For more information on Corbus, visit corbuspharma.com. Connect with us on X, LinkedIn and Facebook. Forward-Looking Statements This press release contains certain forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934 and Private Securities Litigation Reform Act, as amended, including those relating to the Company’s trial results, product development, clinical and regulatory timelines, including timing for completion of trials and presentation of data, market opportunity, competitive position, possible or assumed future results of operations, business strategies, potential growth opportunities and other statement that are predictive in nature. These forward-looking statements are based on current expectations, estimates, forecasts and projections about the industry and markets in which we operate and management’s current beliefs and assumptions. These statements may be identified by the use of forward-looking expressions, including, but not limited to, “expect,” “anticipate,” “intend,” “plan,” “believe,” “estimate,” “potential,” “predict,” “project,” “should,” “would” and similar expressions and the negatives of those terms. These statements relate to future events or our financial performance and involve known and unknown risks, uncertainties, and other factors on our operations, clinical development plans and timelines, which may cause actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements. Such factors include those set forth in the Company’s filings with the Securities and Exchange Commission. Prospective investors are cautioned not to place undue reliance on such forward-looking statements, which speak only as of the date of this press release. The Company undertakes no obligation to publicly update any forward-looking statement, whether as a result of new information, future events or otherwise. All product names, logos, brands and company names are trademarks or registered trademarks of their respective owners. Their use does not imply affiliation or endorsement by these companies. INVESTOR CONTACT: Sean Moran Chief Financial Officer Corbus Pharmaceuticals [email protected] Dan Ferry Managing Director LifeSci Advisors, LLC [email protected] ---tables to follow---