CD20

-- Clinical data on povetacicept in IgA nephropathy will be updated at the upcoming WCN meeting, including follow up at 80 mg and initial data at 240 mg SC once every four-weeks -- -- Povetacicept advancing towards a pivotal phase 3 trial in IgA nephropathy and a phase 2 trial in systemic lupus erythematosus -- SEATTLE--(BUSINESS WIRE)-- Alpine Immune Sciences, Inc. (NASDAQ: ALPN), a leading clinical-stage immunotherapy company focused on developing innovative treatments for autoimmune and inflammatory diseases, today reported full year 2023 financial results and company highlights for the fourth quarter ended December 31, 2023. “2023 was a transformational year for Alpine, with initial IgA nephropathy (IgAN) data presented at the American Society of Nephrology Kidney Week 2023 suggesting a best-in-class pro povetacicept, our next-generation dual BAFF/APRIL inhibitor. With our encouraging data set in IgAN, convenient once monthly dosing regimen, and strong balance sheet, we are rapidly advancing development of povetacicept as a potentially meaningful new therapeutic option for patients living with IgAN, systemic lupus erythematosus (SLE), and multiple other autoantibody-related diseases,” said Mitchell H. Gold, MD, Executive Chairman and Chief Executive Officer of Alpine. Dr. Gold continued, “Looking ahead, Alpine is well positioned for a year of meaningful catalysts, with multiple updates for povetacicept in IgAN and other indications, and the planned initiation of RAINIER, a pivotal phase 3 study of povetacicept in IgAN, and DENALI, a phase 2 study of povetacicept in SLE. In addition to updates on our clinical studies, we look forward to sharing translational data that further supports the best-in-class potential of povetacicept in multiple inflammatory diseases.” Fourth Quarter 2023 Corporate Updates Povetacicept (ALPN-303) First clinical data in IgAN demonstrate that povetacicept 80 mg administered once every four-weeks (Q4W) reduced proteinuria (as assessed by urine protein to creatinine ratio, UPCR) by greater than 50% and was associated with stable renal function (as assessed by estimated glomerular filtration rate, eGFR) at six months. In addition, povetacicept was well tolerated during subcutaneous administration, with no instances of IgG < 3 g/L, and no severe infections (2023 American Society of Nephrology Kidney Week). In a model of murine experimental autoimmune myasthenia gravis, povetacicept improved disease activity, with clinical scores superior to treatment with either the FcRn inhibitor efgartigimod or an anti-CD20 depleting antibody (2023 American Association of Neuromuscular & Electrodiagnostic Medicine Annual Meeting). New translational data from povetacicept in systemic lupus erythematosus demonstrate that povetacicept, as compared to single BAFF or APRIL pathway inhibitors, more potently downregulates genes associated with activation in B cells and significantly reduces multiple disease parameters in a mouse model of lupus, more effectively than WT TACI-Fc or conventional B cell depletion (2023 American College of Rheumatology Convergence). Throughout 2023, the Company presented multiple oral and poster presentations on povetacicept at scientific conferences (Full List of Company Publications and Presentations). Corporate Updates The Company plans to present additional data on povetacicept in IgA nephropathy, including follow up data from the 80 mg Q4W and initial data from the IgAN 240 mg Q4W dose cohorts, during a Late Breaking Abstract session at the World Congress of Nephrology 2024 on Monday April 15th at 4:45 PM ET. The Company plans to present new preclinical data on povetacicept, demonstrating its greater distribution to disease-related end organs compared with WT TACI-Ig, at the 14th European Lupus Meeting. These findings correlate with povetacicept’s improved efficacy in multiple preclinical disease models. The Company intends to initiate RAINIER, a pivotal phase 3 study of povetacicept in IgA nephropathy and DENALI, a phase 2 study of povetacicept in systemic lupus erythematosus in the second half of 2024, pending regulatory agreement. The Company plans to share initial data from RUBY-4 in autoimmune cytopenias in the first half of 2024 at a relevant scientific congress. The Company amended its option and license agreement on acazicolcept with AbbVie, stopping enrollment in the phase 2 study in systemic lupus erythematosus (Synergy), and facilitating early assessment of data. The Company ended the year with $368.2 million in cash and investments as of December 31, 2023, which the Company anticipates should be sufficient to fund its planned operations into 2026. 2023 Financial Results Cash Position and Runway: As of December 31, 2023, Alpine’s cash and investments totaled $368.2 million compared to $273.4 million as of December 31, 2022. The Company anticipates its current cash and investments are sufficient to fund planned operations into 2026. Collaboration Revenue: For the year ended December 31, 2023, collaboration revenue was $58.9 million compared to $30.1 million for the same period in 2022. The increase in collaboration revenue relates primarily to a $24.9 million increase in AbbVie revenue, of which $20.4 million relates to a cumulative catch-up adjustment resulting from the completion of enrollment in Synergy per the amendment with AbbVie, and a $4.5 million increase in Amgen revenue, driven primarily by the expiration of Amgen’s option to select a third Research Program. These increases were partially offset by a $0.6 million decrease in Adaptimmune revenue as we completed our final deliverables under the agreement in June 2023. Research and Development Expense: For the year ended December 31, 2023, research and development expense, inclusive of non-cash expenses, were $80.9 million compared to $70.2 million for the same period in 2022. The increase of $10.7 million was driven by an $8.2 million increase in povetacicept costs, primarily related to higher clinical trial costs, process development, and manufacturing, a $1.3 million increase in acazicolcept costs, due primarily to process development and manufacturing costs, and a $7.7 million increase in personnel costs. General and Administrative Expenses: For the year ended December 31, 2023, general and administrative expenses, inclusive of non-cash expenses, were $22.2 million compared to $18.0 million for the same period in 2022. The increase of $4.3 million was primarily attributable to increases in personnel costs and professional services. Net Loss: Net loss for the year ended December 31, 2023, was $32.2 million compared to $57.8 million for the same period in 2022. Alpine Immune Sciences, Inc. Selected Consolidated Balance Sheet Data (In thousands) December 31, 2023 December 31, 2022 (unaudited) Cash and cash equivalents $ 43,921 $ 13,376 Short-term investments 283,491 224,265 Total current assets 330,034 240,993 Long-term investments 40,556 35,481 Total assets 379,852 286,686 Total current liabilities 41,980 57,996 Total stockholders’ equity 327,941 179,420 Total liabilities and stockholders’ equity 379,852 286,686 Consolidated Statement of Operations and Comprehensive Income (Loss) Data (In thousands, except share and per share amounts) Years Ended December 31, 2023 2022 (unaudited) Collaboration revenue $ 58,876 $ 30,064 Operating expenses: Research and development 80,904 70,243 General and administrative 22,222 17,968 Total operating expenses 103,126 88,211 Loss from operations (44,250 ) (58,147 ) Other income (expense): Interest income 11,852 3,288 Interest expense (98 ) (476 ) Other, net 415 (97 ) Loss before taxes (32,081 ) (55,432 ) Income tax (expense) benefit (103 ) (2,330 ) Net loss $ (32,184 ) $ (57,762 ) Comprehensive income (loss): Unrealized gain (loss) on investments 1,493 (901 ) Unrealized gain (loss) on foreign currency translation 25 53 Comprehensive loss $ (30,666 ) $ (58,610 ) Weighted-average shares used to compute basic and diluted net loss per share 50,000,339 33,435,280 Basic and diluted net loss per share $ (0.64 ) $ (1.73 ) About Povetacicept (ALPN-303) Povetacicept (ALPN-303) is a dual antagonist of the BAFF (B cell activating factor) and APRIL (a proliferation inducing ligand) cytokines, which play key roles in pathogenesis of multiple autoimmune diseases via their roles in the activation, differentiation and/or survival of B cells, particularly antibody-secreting cells, as well as T cells and innate immune cells. Based upon an engineered TACI (transmembrane activator and CAML interactor) domain, povetacicept has exhibited greater potency in preclinical studies versus other inhibitors of BAFF and/or APRIL alone and B cell depletion. Povetacicept is in development for multiple autoimmune diseases, including IgA nephropathy and other autoimmune kidney diseases, systemic lupus erythematosus, and autoimmune cytopenias. About RUBY-3 RUBY-3 (NCT05732402) is a multiple ascending dose, multi-cohort, open label, phase 1b/2a study of povetacicept in autoimmune glomerulonephritis, including IgA nephropathy, primary membranous nephropathy, lupus nephritis, and renal ANCA-associated vasculitis, where povetacicept is being administered subcutaneously for up to 104 weeks. Key endpoints include proteinuria, eGFR, renal response, and disease-related autoantibodies. About RUBY-4 RUBY-4 (NCT05757570) is a multi-cohort, open label, phase 1b study of povetacicept in immune thrombocytopenia, autoimmune hemolytic anemia, and cold agglutinin disease, where povetacicept is being administered subcutaneously for up to 48 weeks. Key endpoints include respective blood cell counts, including durable responses, as well as disease-related autoantibodies. About Alpine Immune Sciences Alpine Immune Sciences is committed to leading a new wave of immune therapeutics. With world-class research and development capabilities, a highly productive scientific platform, and a proven management team, Alpine is seeking to create first- or best-in-class multifunctional immunotherapies via unique protein engineering technologies to improve patients’ lives. Alpine has entered into strategic collaborations with leading global biopharmaceutical companies and has a diverse pipeline of clinical and preclinical candidates in development. For more information, visit . Follow @AlpineImmuneSci on X and LinkedIn. Forward-Looking Statements This release contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, Section 21E of the Securities Exchange Act of 1934 and the Private Securities Litigation Reform Act of 1995. These forward-looking statements are not based on historical fact and include statements regarding our platform technology and potential therapies; the timing of and results from clinical trials and preclinical development activities; clinical and regulatory objectives and the timing thereof; expectations regarding the sufficiency of cash, including cash equivalents and restricted cash, and investments to fund our planned operations into 2026; our ability to achieve additional milestones in our collaborations and proprietary programs; the progress and potential of our development programs; future development plans and clinical and regulatory milestones and objectives, including the timing and achievement thereof; the efficacy of our clinical trial designs; anticipated enrollment in our clinical trials and the timing thereof; expectations regarding the anticipated reporting of data from our ongoing and planned clinical trials and potential publication of future clinical data; our ability to potentially advance povetacicept directly into a pivotal trial in the second half of 2024 as well as a phase 2 study in systemic lupus erythematosus, pending engagement with and approval of the Food and Drug Administration; and the potential efficacy, safety profile, addressable market, regulatory success and commercial or therapeutic potential of our product candidates. Forward-looking statements generally include statements that are predictive in nature and depend upon or refer to future events or conditions and include words such as “may,” “will,” “should,” “would,” “expect,” “plan,” “intend,” and other similar expressions, among others. These forward-looking statements are based on current assumptions that involve risks, uncertainties, and other factors that may cause actual results, events, or developments to be materially different from those expressed or implied by such forward-looking statements. These risks and uncertainties, many of which are beyond our control, include, but are not limited to: clinical trials may not demonstrate safety and efficacy of any of our product candidates; our ongoing discovery and preclinical efforts may not yield additional product candidates; our discovery stage and preclinical programs may not advance into the clinic or result in approved products; any of our product candidates may fail in development, may not receive required regulatory approvals, or may be delayed to a point where they are not commercially viable; we may not achieve additional milestones in our proprietary or partnered programs; the impact of competition; adverse conditions in the general domestic and global economic markets; we may be unable to advance povetacicept directly into a pivotal trial or a phase 2 study in systemic lupus erythematosus in the second half of 2024; the impact of pandemics, or other related health crises on our business, research and clinical development plans and timelines and results of operations, including the impact on our clinical trial sites, collaborators, and contractors who act for or on our behalf; as well as the other risks identified in our filings with the Securities and Exchange Commission. These forward-looking statements speak only as of the date hereof and we undertake no obligation to update forward-looking statements, and readers are cautioned not to place undue reliance on such forward-looking statements. The RUBY and Alpine logos are registered trademarks of Alpine Immune Sciences, Inc. in various jurisdictions.

Pictured: FDA headquarters surrounded by pill bottles/Taylor Tieden for BioSpace The FDA’s busy March continues with six target action dates remaining on the calendar. Over the next two weeks, the regulator will decide on investigational therapies for Duchenne muscular dystrophy, chronic kidney disease anemia, a rare metabolic disorder and more. Read below for more. Orchard/Kyowa Kirin Eye First FDA Approval for Metachromatic Leukodystrophy Orchard Therapeutics is proposing Libmeldy (atidarsagene autotemcel) for the treatment of metachromatic leukodystrophy (MLD), a rare metabolic disease. The FDA’s target action date is March 18, 2024. If approved, Libmeldy would become the first treatment for early-onset MLD in the U.S. The approval would also mark the first major regulatory victory for Kyowa Kirin since it acquired Orchard in October 2023 for approximately $477.6 million. Affecting one in every 100,000 live births, MLD is a heritable and life-threatening disease characterized by the toxic build-up of sulfatides in the brain, liver, kidneys and other organs. This accumulation can lead to organ damage and neurological issues such as cognitive, behavioral and motor decline. MLD patients also suffer from severe seizures and over time lose their ability to talk, swallow, eat, move and see. MLD is caused by a pathological mutation in the arylsulfatase-A (ARSA) gene. Libmeldy, an autologous gene therapy, addresses the underlying mechanism of MLD by using a patient’s own stem cells to deliver functioning copy of the ARSA gene. The European Union approved Libmeldy for the treatment of MLD in December 2020. In the U.S., Libmeldy, also known as OTL-200, has been granted the FDA’s Rare Pediatric Disease and Regenerative Medicine Advanced Therapy designations. Its Biologics License Application (BLA), which the regulator accepted in September 2023, has been given Priority Review. Libmeldy’s regulatory bid is backed by data from the OTL-200 clinical development program, which enrolled a total of 39 pediatric patients and used data from 49 untreated natural history controls. Results showed that Libmeldy could preserve motor function and cognitive development in treated patients. ITF Awaits Verdict for DMD Candidate ITF, the U.S. subsidiary of Italian pharma Italfarmaco Group, is proposing its investigational HDAC blocker givinostat for the treatment of Duchenne muscular dystrophy (DMD). The FDA’s verdict is due on March 21, 2024. Designed to be orally available, givinostat works by blocking histone deacetylases (HDACs), a group of enzymes that affect gene expression in muscles. The “deregulation of HDACs is a major consequence of the lack of dystrophin associated with DMD,” ITF head Matt Trudeau told BioSpace in a previous interview. Givinostat’s mechanism of action can potentially “inhibit HDAC pathological overactivity and thereby impact the cascade of events leading to muscle damage which, in turn, may counteract disease pathology and slow muscle deterioration,” Trudeau explained. ITF’s New Drug Application (NDA), which was submitted in June 2023, includes data from the Phase III EPIDYS trial, which enrolled 179 ambulant boys aged six years and older. Givinostat was given on top of steroid treatment. Patients who received the HDAC blocker showed a significantly slower decline than placebo recipients in the time it took to climb four stairs, according to a June 2022 readout. Givinostat also aced its secondary endpoints, including the time to rise test and the North Star Ambulatory Assessment, which measures patient function. Givinostat was initially granted Priority Review and was due for an FDA decision in December 2023. However, the regulator informed Italfarmaco weeks before its target action date that it would extend the review period by three months to allow additional review time. Merck Seeks to Open New Treatment Approach for PAH By March 26, the FDA will release its decision on Merck’s investigational activin signaling inhibitor sotatercept, which the company is proposing for the treatment of pulmonary arterial hypertension (PAH). In a statement alongside the BLA acceptance, Joerg Koglin, senior vice president of global clinical development at Merck Research Laboratories, said sotatercept “has the potential to transform the treatment of patients with PAH.” Sotatercept is a fusion protein therapeutic composed of the extracellular domain of the human activin receptor and the Fc domain of an IgG1 antibody. This structure allows sotatercept to trap TGF-β ligands, thereby helping to restore balance between growth-promoting and growth-limiting pathways. Preclinical models have demonstrated that sotatercept’s mechanism of action can modulate vascular cell proliferation and reverse vascular and ventricle remodeling. Merck is supporting sotatercept’s regulatory bid with data from the pivotal Phase III STELLAR study, a double-blinded and placebo-controlled trial that enrolled more than 320 patients. The results, published in The New England Journal of Medicine, showed that sotatercept could significantly increase six-minute walk distance after 24 weeks. Sotatercept likewise outperformed placebo in several secondary metrics, including pulmonary vascular resistance, improvement in WHO functional class and time to death or clinical worsening. Akebia Anticipates Long-Awaited Decision for CKD Anemia Drug After a long back and forth, the FDA is set to announce its verdict on Akebia’s NDA seeking approval for vadadustat in anemia due to chronic kidney disease (CKD) in adult patients on dialysis. Vadadustat is an investigational inhibitor of the hypoxia-inducible factor prolyl hydroxylase (HIF-PH) enzyme, which is involved in the cellular response to low oxygen levels. Vadadustat mimics the physiological effects of altitude on oxygen availability and can promote the production of red blood cells and the delivery of oxygen to tissues. In March 2022, the FDA rejected vadadustat, citing safety concerns. Phase III data for the candidate, released in September 2020, showed that while vadadustat aced its primary and key secondary endpoints, it failed its chief safety outcomes. Compared with darbepoetin alfa, major adverse cardiovascular events occurred more readily in the vadadustat arm. To demonstrate a more favorable risk-benefit profile, the FDA suggested that Akebia conduct new clinical trials to support vadadustat. Following the rejection, Akebia in November 2022 filed a Formal Dispute Resolution Request with the FDA, insisting on the “favorable balance of the benefits and risks of vadadustat,” CEO John Butler said in an investor call at the time. The FDA then requested additional information to support Akebia’s appeal, but in February 2023 ultimately decided to defer the decision to the Office of New Drugs. In May 2023, the FDA handed Akebia a victory when it decided the biotech no longer needed to conduct additional studies for a resubmission. Instead, it could re NDA to target CKD patients on dialysis and include post-approval data from Japan. The new application would also include the risk of heart- or liver-related side effects in the proposed label. Esperion Seeks Expanded Label for Cholesterol Drugs Esperion is proposing to expand the labels for its bempedoic acid drugs Nexletol and Nexlizet, allowing their use to lower cardiovascular risk in patients with or at risk of atherosclerotic cardiovascular disease. The FDA’s decision is due on March 31. Bempedoic acid is a non-statin oral drug that lowers low-density lipoprotein cholesterol (LDL-C) via the inhibition of the ATP citrate lyase enzyme. The drug was first approved in February 2020 as Nexletol, becoming the first FDA-approved non-statin therapy to lower LDL-C since 2002. In March 2023, Esperion presented full data from the Phase III CLEAR study demonstrating that Nexletol cut the risk of major adverse cardiovascular events (MACE) by 13% to 15%. The drug also lowered the risk of heart attack and coronary revascularization by 23% and 19%, respectively, Esperion reported. In an accompanying statement, Esperion CEO Sheldon Koenig called the results “practice changing.” In an investor call, he added that if the label expansion is approved, Esperion could see major growth in sales and Nexletol could reach blockbuster status. Investors were not as impressed, however, and the biotech’s shares dropped around 20% in reaction to the readout. Esperion’s partner Daiichi Sankyo was also unimpressed with the data, refusing to pay a $300 million milestone that Esperion insists it will be owed once cardiovascular risk reduction data are included in Nexletol’s European label. According to an SEC filing from Esperion, it was entitled to a milestone payment if Nexletol could show at least a 20% cardiovascular risk reduction. The 23% decrease in heart attack risk, according to the biotech, qualified it for the milestone. Daiichi Sankyo disagreed, insisting that the analysis should focus on the 13% drop in MACE risk, which fell short of this milestone. In January 2024, the partners reached an amicable end to the payment spat, with Daiichi Sankyo agreeing to pay Esperion $125 million in two separate tranches. Regeneron Eyes Follicular Lymphoma, DLBCL Approval for Bispecific Antibody Capping off the FDA’s month is a target action date for Regeneron’s BLA proposing its investigational bispecific antibody odronextamab for relapsed or refractory follicular lymphoma (FL) and diffuse large B-cell lymphoma (DLBCL). The regulator is set to release its verdict on March 31. Regeneron is supporting its application with data from Phase I and pivotal Phase II trials, which were presented at the 64th American Society of Hematology meeting in December 2022. One study evaluated odronextamab as a treatment for grade I to IIIa relapsed or refractory FL and found it elicited an 82% objective response rate (ORR), with 75% seeing a complete response. The median response time was 20.5 months. The trial also found that median progression-free survival was 20 months, while median overall survival at the time had not been reached. The second study tested odronextamab in relapsed or refractor DLBCL, for which the investigational antibody demonstrated a 49% objective response rate in CAR-T-naïve patients. In this subgroup, 31% achieved complete response. In those who had previously been exposed to CAR-T therapy, the ORR was 48%, with a 32% complete response rate. Odronextamab is an investigational bispecific antibody designed to target CD20, which is typically expressed on cancer cells, and CD3, which is found on T cells. This mechanism of action allows odronextamab to bring the immune cell closer to the tumor cell, facilitating the body’s cancer-killing activity. If approved, odronextamab would become the first bispecific antibody authorized to treat both FL and DLBCL. Tristan Manalac is an independent science writer based in Metro Manila, Philippines. Reach out to him on LinkedIn or email him at tristan@tristanmanalac.com or tristan.manalac@biospace.com.

NEW YORK, March 08, 2024 (GLOBE NEWSWIRE) -- TG Therapeutics, Inc. (NASDAQ: TGTX), today announced the schedule of data presentations highlighting data from the ULTIMATE I & II Phase 3 trials evaluating BRIUMVI® (ublituximab-xiiy) in patients with relapsing forms of multiple sclerosis (RMS), at the upcoming American Academy of Neurology 2024 annual meeting, being held April 13 - 18, 2024, in Dever, Colorado. Abstracts are now available online and can be accessed on the AAN meeting website at https://www.aan.com/msa/Public/Events/Index/49. Details of the upcoming presentations are outlined below. Poster Presentation Title: MS Relapse Redefined: Distinguishing True Relapses from Pseudoexacerbations in the ULTIMATE I and II Trials Comparing Ublituximab vs Teriflunomide Presentation Date/Time: Sunday, April 14, from 5:30 PM - 6:30 PM MSTSession: P3: Multiple Sclerosis: Therapeutics and Symptom ManagementAbstract Number/Poster Number: 6567/001 in Neighborhood 6Lead Author: Stephen Krieger, MD - The Corinne Goldsmith Dickinson Center for MS, The Mount Sinai Hospital NY, NY Poster Presentation Title: Ublituximab Significantly Reduces Radiological Disease Activity at 12 Weeks: Post-hoc analysis of Participants with Highly Active Disease in the ULTIMATE I & II Phase 3 Studies Presentation Date/Time: Wednesday, April 17, from 8:00 AM - 9:00 AM MSTSession: P9: Multiple Sclerosis: Clinical Trials and Therapeutics (including Safety) 2Abstract Number/Poster Number: 6023/017 in Neighborhood 6Lead Author: Derrick Robertson, MD - University of South Florida (USF) Morsani College of Medicine in Tampa, Florida Poster Presentation Title: Earlier Initiation of Ublituximab Treatment Is Associated with Improved Disability Outcomes Among Treatment Nave Participants in ULTIMATE I and II Presentation Date/Time: Wednesday, April 17, from 8:00 AM - 9:00 AM MSTSession: P9: Multiple Sclerosis: Clinical Trials and Therapeutics (including Safety) 2Abstract Number/Poster Number: 6400/001 in Neighborhood 6Lead Author: Derrick Robertson, MD - University of South Florida (USF) Morsani College of Medicine in Tampa, Florida Following the presentations, the data presented will be available on the Publications page, located within the Pipeline section, of the Company’s website at www.tgtherapeutics.com/publications.cfm. ABOUT THE ULTIMATE I & II PHASE 3 TRIALSULTIMATE I & II are two randomized, double-blind, double-dummy, parallel group, active comparator-controlled clinical trials of identical design, in patients with RMS treated for 96 weeks. Patients were randomized to receive either BRIUMVI, given as an IV infusion of 150 mg administered in four hours, 450 mg two weeks after the first infusion administered in one hour, and 450 mg every 24 weeks administered in one hour, with oral placebo administered daily; or teriflunomide, the active comparator, given orally as a 14 mg daily dose with IV placebo administered on the same schedule as BRIUMVI. Both studies enrolled patients who had experienced at least one relapse in the previous year, two relapses in the previous two years, or had the presence of a T1 gadolinium (Gd)-enhancing lesion in the previous year. Patients were also required to have an Expanded Disability Status Scale (EDSS) score from 0 to 5.5 at baseline. The ULTIMATE I & II trials enrolled a total of 1,094 patients with RMS across 10 countries. These trials were led by Lawrence Steinman, MD, Zimmermann Professor of Neurology & Neurological Sciences, and Pediatrics at Stanford University. Additional information on these clinical trials can be found at www.clinicaltrials.gov (NCT03277261; NCT03277248). ABOUT BRIUMVI® (ublituximab-xiiy) 150 mg/6 mL Injection for IVBRIUMVI is a novel monoclonal antibody that targets a unique epitope on CD20-expressing B-cells. Targeting CD20 using monoclonal antibodies has proven to be an important therapeutic approach for the management of autoimmune disorders, such as RMS. BRIUMVI is uniquely designed to lack certain sugar molecules normally expressed on the antibody. Removal of these sugar molecules, a process called glycoengineering, allows for efficient B-cell depletion at low doses. BRIUMVI is indicated for the treatment of adults with relapsing forms of multiple sclerosis (RMS), to include clinically isolated syndrome, relapsing-remitting disease, and active secondary progressive disease. A list of authorized specialty distributors can be found at www.briumvi.com. IMPORTANT SAFETY INFORMATIONContraindications: BRIUMVI is contraindicated in patients with: Active Hepatitis B Virus infectionA history of life-threatening infusion reaction to BRIUMVI WARNINGS AND PRECAUTIONS Infusion Reactions: BRIUMVI can cause infusion reactions, which can include pyrexia, chills, headache, influenza-like illness, tachycardia, nausea, throat irritation, erythema, and an anaphylactic reaction. In MS clinical trials, the incidence of infusion reactions in BRIUMVI-treated patients who received infusion reaction-limiting premedication prior to each infusion was 48%, with the highest incidence within 24 hours of the first infusion. 0.6% of BRIUMVI-treated patients experienced infusion reactions that were serious, some requiring hospitalization. Observe treated patients for infusion reactions during the infusion and for at least one hour after the completion of the first two infusions unless infusion reaction and/or hypersensitivity has been observed in association with the current or any prior infusion. Inform patients that infusion reactions can occur up to 24 hours after the infusion. Administer the recommended pre-medication to reduce the frequency and severity of infusion reactions. If life-threatening, stop the infusion immediately, permanently discontinue BRIUMVI, and administer appropriate supportive treatment. Less severe infusion reactions may involve temporarily stopping the infusion, reducing the infusion rate, and/or administering symptomatic treatment. Infections: Serious, life-threatening or fatal, bacterial and viral infections have been reported in BRIUMVI-treated patients. In MS clinical trials, the overall rate of infections in BRIUMVI-treated patients was 56% compared to 54% in teriflunomide-treated patients. The rate of serious infections was 5% compared to 3% respectively. There were 3 infection-related deaths in BRIUMVI-treated patients. The most common infections in BRIUMVI-treated patients included upper respiratory tract infection (45%) and urinary tract infection (10%). Delay BRIUMVI administration in patients with an active infection until the infection is resolved. Consider the potential for increased immunosuppressive effects when initiating BRIUMVI after immunosuppressive therapy or initiating an immunosuppressive therapy after BRIUMVI. Hepatitis B Virus (HBV) Reactivation: HBV reactivation occurred in an MS patient treated with BRIUMVI in clinical trials. Fulminant hepatitis, hepatic failure, and death caused by HBV reactivation have occurred in patients treated with anti-CD20 antibodies. Perform HBV screening in all patients before initiation of treatment with BRIUMVI. Do not start treatment with BRIUMVI in patients with active HBV confirmed by positive results for HBsAg and anti-HB tests. For patients who are negative for surface premedantigen [HBsAg] and positive for HB core antibody [HBcAb+] or are carriers of HBV [HBsAg+], consult a liver disease expert before starting and during treatment. Progressive Multifocal Leukoencephalopathy (PML): Although no cases of PML have occurred in BRIUMVI-treated MS patients, JCV infection resulting in PML has been observed in patients treated with other anti-CD20 antibodies and other MS therapies. If PML is suspected, withhold BRIUMVI and perform an appropriate diagnostic evaluation. Typical symptoms associated with PML are diverse, progress over days to weeks, and include progressive weakness on one side of the body or clumsiness of limbs, disturbance of vision, and changes in thinking, memory, and orientation leading to confusion and personality changes. MRI findings may be apparent before clinical signs or symptoms; monitoring for signs consistent with PML may be useful. Further investigate suspicious findings to allow for an early diagnosis of PML, if present. Following discontinuation of another MS medication associated with PML, lower PML-related mortality and morbidity have been reported in patients who were initially asymptomatic at diagnosis compared to patients who had characteristic clinical signs and symptoms at diagnosis. If PML is confirmed, treatment with BRIUMVI should be discontinued. Vaccinations: Administer all immunizations according to immunization guidelines: for live or live-attenuated vaccines at least 4 weeks and, whenever possible at least 2 weeks prior to initiation of BRIUMVI for non-live vaccines. BRIUMVI may interfere with the effectiveness of non-live vaccines. The safety of immunization with live or live-attenuated vaccines during or following administration of BRIUMVI has not been studied. Vaccination with live virus vaccines is not recommended during treatment and until B-cell repletion. Vaccination of Infants Born to Mothers Treated with BRIUMVI During Pregnancy: In infants of mothers exposed to BRIUMVI during pregnancy, assess B-cell counts prior to administration of live or live-attenuated vaccines as measured by CD19+ B-cells. Depletion of B-cells in these infants may increase the risks from live or live-attenuated vaccines. Inactivated or non-live vaccines may be administered prior to B-cell recovery. Assessment of vaccine immune responses, including consultation with a qualified specialist, should be considered to determine whether a protective immune response was mounted. Fetal Risk: Based on data from animal studies, BRIUMVI may cause fetal harm when administered to a pregnant woman. Transient peripheral B-cell depletion and lymphocytopenia have been reported in infants born to mothers exposed to other anti-CD20 B-cell depleting antibodies during pregnancy. A pregnancy test is recommended in females of reproductive potential prior to each infusion. Advise females of reproductive potential to use effective contraception during BRIUMVI treatment and for 6 months after the last dose. Reduction in Immunoglobulins: As expected with any B-cell depleting therapy, decreased immunoglobulin levels were observed. Decrease in immunoglobulin M (IgM) was reported in 0.6% of BRIUMVI-treated patients compared to none of the patients treated with teriflunomide in RMS clinical trials. Monitor the levels of quantitative serum immunoglobulins during treatment, especially in patients with opportunistic or recurrent infections, and after discontinuation of therapy until B-cell repletion. Consider discontinuing BRIUMVI therapy if a patient with low immunoglobulins develops a serious opportunistic infection or recurrent infections, or if prolonged hypogammaglobulinemia requires treatment with intravenous immunoglobulins. Most Common Adverse Reactions: The most common adverse reactions in RMS trials (incidence of at least 10%) were infusion reactions and upper respiratory tract infections. Physicians, pharmacists, or other healthcare professionals with questions about BRIUMVI should visit www.briumvi.com. ABOUT BRIUMVI PATIENT SUPPORT BRIUMVI Patient Support is a flexible program designed by TG Therapeutics to support U.S. patients through their treatment journey in a way that works best for them. More information about the BRIUMVI Patient Support program can be accessed at www.briumvipatientsupport.com. ABOUT MULTIPLE SCLEROSIS Relapsing multiple sclerosis (RMS) is a chronic demyelinating disease of the central nervous system (CNS) and includes people with relapsing-remitting multiple sclerosis (RRMS) and people with secondary progressive multiple sclerosis (SPMS) who continue to experience relapses. RRMS is the most common form of multiple sclerosis (MS) and is characterized by episodes of new or worsening signs or symptoms (relapses) followed by periods of recovery. It is estimated that nearly 1 million people are living with MS in the United States and approximately 85% are initially diagnosed with RRMS.1,2 The majority of people who are diagnosed with RRMS will eventually transition to SPMS, in which they experience steadily worsening disability over time. Worldwide, more than 2.3 million people have a diagnosis of MS.1 ABOUT TG THERAPEUTICSTG Therapeutics is a fully integrated, commercial stage, biopharmaceutical company focused on the acquisition, development and commercialization of novel treatments for B-cell diseases. In addition to a research pipeline including several investigational medicines, TG has received U.S. Food and Drug Administration (FDA) approval for BRIUMVI® (ublituximab-xiiy), for the treatment of adult patients with relapsing forms of multiple sclerosis (RMS), to include clinically isolated syndrome, relapsing-remitting disease, and active secondary progressive disease, as well as approval by the European Commission (EC) and the Medicines and Healthcare Products Regulatory Agency (MHRA) for BRIUMVI to treat adult patients with RMS who have active disease defined by clinical or imaging features in Europe and the United Kingdom, respectively. For more information, visit www.tgtherapeutics.com, and follow us on X (formerly Twitter) @TGTherapeutics and on LinkedIn. BRIUMVI® is a registered trademark of TG Therapeutics, Inc. Cautionary StatementThis press release contains forward-looking statements that involve a number of risks and uncertainties. For those statements, we claim the protection of the safe harbor for forward-looking statements contained in the Private Securities Litigation Reform Act of 1995. Any forward-looking statements in this press release are based on management's current expectations and beliefs and are subject to a number of risks, uncertainties and important factors that may cause actual events or results to differ materially from those expressed or implied by any forward-looking statements contained in this press release. In addition to the risk factors identified from time to time in our reports filed with the U.S. Securities and Exchange Commission (SEC), factors that could cause our actual results to differ materially include the below. Such forward looking statements include but are not limited to statements regarding the results of the ULTIMATE I & II Phase 3 studies, the ENHANCE Phase 3b study, and BRIUMVI as a treatment for relapsing forms of multiple sclerosis (RMS). Additional factors that could cause our actual results to differ materially include the following: the risk that the data from the ULTIMATE I & II or ENHANCE trials that we announce or publish may change, or the product profile of BRIUMVI may be impacted, as more data or additional endpoints are analyzed; the risk that data may emerge from future clinical studies or from adverse event reporting that may affect the safety and tolerability profile and commercial potential of BRIUMVI; the risk that any individual patient’s clinical experience in the post-marketing setting, or the aggregate patient experience in the post-marketing setting, may differ from that demonstrated in controlled clinical trials such as ULTIMATE I and II; the risk that BRIUMVI will not be commercially successful; our ability to expand our commercial infrastructure, and successfully market and sell BRIUMVI in RMS; the Company’s reliance on third parties for manufacturing, distribution and supply, and a range of other support functions for our commercial and clinical products, including BRIUMVI, and the ability of the Company and its manufacturers and suppliers to produce and deliver BRIUMVI to meet the market demand for BRIUMVI; the failure to obtain and maintain requisite regulatory approvals, including the risk that the Company fails to satisfy post-approval regulatory requirements; the uncertainties inherent in research and development; and general political, economic and business conditions, including the risk that the ongoing COVID-19 pandemic could have on the safety profile of BRIUMVI and any of our other drug candidates as well as any government control measures associated with COVID-19 that could have an adverse impact on our research and development plans or commercialization efforts. Further discussion about these and other risks and uncertainties can be found in our Annual Report on Form 10-K for the fiscal year ended December 31, 2023 and in our other filings with the U.S. Securities and Exchange Commission. Any forward-looking statements set forth in this press release speak only as of the date of this press release. We do not undertake to update any of these forward-looking statements to reflect events or circumstances that occur after the date hereof. This press release and prior releases are available at www.tgtherapeutics.com. The information found on our website is not incorporated by reference into this press release and is included for reference purposes only. CONTACT: Investor Relations Email: ir@tgtxinc.comTelephone: 1.877.575.TGTX (8489), Option 4 Media Relations: Email: media@tgtxinc.com Telephone: 1.877.575.TGTX (8489), Option 6 1. MS Prevalence. National Multiple Sclerosis Society website. https://www.nationalmssociety.org/About-the-Society/MS-Prevalence. Accessed October 26, 2020. 2. Multiple Sclerosis International Federation, 2013 via Datamonitor p. 236.