UB-312

UB-312 is the first Parkinson's candidate to reduce pathology as measured by a seed amplification assay, and suggest clinical improvement on motor experiences of daily living. Data demonstrates target engagement and immunogenicity of the active immunotherapy UB-312 targeting pathological alpha-synuclein. CAPE CANAVERAL, Fla., June 20, 2024 (GLOBE NEWSWIRE) -- Vaxxinity, Inc. (OTC: VAXX), a U.S. company pioneering the development of a new class of medicines known as AIMs (active immunotherapy medicines), announced today that Nature Medicine has published groundbreaking exploratory data from the Company’s Phase 1 clinical trial of UB-312 in patients with Parkinson's disease (PD). The successful trial included measures of clinical efficacy, as well as exploratory research funded by The Michael J. Fox Foundation (MJFF) assessing target engagement in collaboration with the Mayo Clinic and UTHealth Houston. UB-312-induced antibodies significantly decreased levels of aggregated α-synuclein (αSyn), a key pathology in PD and other synucleinopathies, as measured by a semi-quantitative seed amplification assay (SAA). This suggests that UB-312 can help to eliminate the buildup of harmful, toxic forms of the protein αSyn in the brain. Patients with detectable UB-312-induced antibodies in cerebrospinal fluid (CSF) exhibited significant improvement in motor experiences of daily living as measured by the MDS-UPDRS Part II, a commonly accepted clinical scale. This marks a potentially significant milestone in the pursuit of innovative PD care. The Phase 1 successfully met its primary outcome measures, demonstrating UB-312 was generally well-tolerated and induced anti-αSyn antibody responses in healthy volunteers and PD patients. 12 out of 13 PD patients who completed dosing developed anti-αSyn antibodies. “The publication of this data in Nature Medicine immortalizes the profound impact of UB-312, leading the charge against the very core of Parkinson’s,” added Lou Reese, Co-Founder and Executive Chairman of Vaxxinity. “It sparks a beacon of hope and anticipation for a future where Parkinson's no longer determines the trajectory of lives. This is more than just a scientific breakthrough; it's a battle cry for change, declaring that the status quo in Parkinson's care is no longer acceptable." Parkinson’s disease, a progressive neurodegenerative condition, currently lacks an approved disease-modifying treatment. Alpha-synuclein, a key protein in PD pathology, forms aggregates known as Lewy bodies that contribute to neuronal degeneration. UB-312 is designed to stimulate a targeted immune response against pathological forms of αSyn. Notable highlights from the exploratory Phase 1 data published in Nature Medicine include: Two exploratory CSF biomarkers show promise as measures of target engagement. aggregated αSyn, as measured by an SAA phosphorylated αSyn (pS129-αSyn) PD patients with UB-312-induced antibodies in CSF had significantly less αSyn aggregation (p <0.01) and pS129-αSyn (p <0.05) compared to patients without detectable CSF antibody titers. PD patients with UB-312-induced antibodies in CSF showed significant improvement in the MDS-UPDRS Part II motor experiences of daily living compared to patients without detectable CSF antibody titers (p<0.05). In vitro, UB-312-induced antibodies preferentially bind to aggregated forms of αSyn as measured by dot blot, and slow the aggregation of αSyn as measured by seed amplification. ”UB-312 has the potential to become an important and potent disease-modifying therapy for Parkinson’s disease. It would be truly amazing if we could vaccinate people against Parkinson’s disease in the future!” says Professor Geert Jan Groeneveld, neurologist and principal investigator of the Phase 1 clinical trial performed at the Centre for Human Drug Research in Leiden, the Netherlands. The publication in Nature Medicine follows the completion of Part B of the Phase 1 clinical trial, which involved 20 patients with early PD (Hoehn & Yahr stage ≤ III) dosed with one of two priming regimens of UB-312 or placebo, and followed for 24 weeks of observation. Vaxxinity plans to continue its research and development efforts to advance UB-312 as candidate for PD. Results from Part A of the trial in 50 healthy volunteers, aged 40 to 85 years, were published in Movement Disorders in 2022 (Yu et al.). The exploratory biomarker and target engagement research portion of the trial was funded by The Michael J. Fox Foundation (MJFF), and marked a two-year collaborative project between Vaxxinity, the Mayo Clinic, and UTHealth Houston to analyze CSF collected from patients. About UB-312 UB-312 is an AIM designed to slow or stop Parkinson's progression by addressing the root cause of the disease. In the first patient trial, it safely induced antibodies against toxic alpha-synuclein (αSyn) aggregates, representing a potential disease-modifying therapy. It is the first active immunotherapy to demonstrate target engagement in patient CSF using the αSyn seed amplification assay. About Vaxxinity Vaxxinity, Inc. is a purpose-driven biotechnology company committed to democratizing healthcare across the globe. The company is pioneering a new class of medicines known as AIMs (active immunotherapy medicines) with the goal of disrupting the existing treatment paradigm for chronic disease, increasingly dominated by monoclonal antibodies, which suffer from prohibitive costs and cumbersome administration. The company’s proprietary AIM technology platform has enabled the innovation of novel synthetic peptide immunotherapy candidates designed to bring the efficiency of active immunotherapies to the treatment of chronic diseases, including Alzheimer’s disease, Parkinson’s disease, migraine, and hypercholesterolemia. The technology is also implemented as part of a COVID-19 vaccine program. Vaxxinity has optimized its pipeline to achieve a potentially historic, global impact on human health. For more information about Vaxxinity, Inc., visit and follow us on social media @vaxxinity. About the Centre for Human Drug Research The Centre for Human Drug Research (CHDR) is an independent institute that specializes in cutting-edge, early-phase clinical drug research. CHDR develops and uses state-of-the-art methods and research tools to collect as much information as possible about candidate drugs in the early phases of clinical development, helping sponsors make informed decisions regarding the further development of their product. For more information about CHDR, visit: Forward-looking Statements This press release includes forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. The use of certain words, including "believe," "may," "continue," "advancing," "will" and similar expressions, are intended to identify forward-looking statements. Forward-looking statements include statements, other than statements of historical fact, regarding, among other things: the plans for, or progress, scope, initiation, duration, enrollment, results or timing for availability of results of, development of any of Vaxxinity’s product candidates or programs; the target indication(s) for development or approval, the size, design, population, location, conduct, cost, objective, enrollment, duration or endpoints of any clinical trial, or the timing for initiation or completion of or availability or reporting of results from any clinical trial; the potential future regulatory authorization or approval and commercialization of Vaxxinity’s product candidates; the potential benefits or competitive position of any Vaxxinity product candidate or program or the commercial opportunity in any target indication; and Vaxxinity’s plans, expectations or future operations, financial position, revenues, costs or expenses. These forward-looking statements involve substantial risks and uncertainties, including statements that are based on the current expectations and assumptions of Vaxxinity’s management about the development of a new class of immunotherapeutic vaccines and the innovation and efficacy of Vaxxinity’s product candidates. Various important factors could cause actual results or events to differ materially from those that may be expressed or implied by our forward-looking statements, including, but not limited to: whether UB-311, UB-312, UB-313, VXX-401, UB-612 or any other current or future product candidate of Vaxxinity will be approved or authorized by any regulatory agency for the indications that Vaxxinity targets; any potential negative impacts of the COVID-19 pandemic, including on manufacturing, supply, conduct or initiation of clinical trials, or other aspects of Vaxxinity’s business; Vaxxinity’s product candidates may not be successful or clinical development may take longer and be more costly than anticipated; product candidates that appeared promising in earlier research and clinical trials may not demonstrate safety or efficacy in larger-scale or later clinical trials or in clinical trials for other indications; the timing for initiation or completion of, or for availability of data from, clinical trials for UB-311, UB-312, UB-313, VXX-401 or UB-612, and the outcomes of such trials; Vaxxinity’s reliance on collaborative partners and other third parties for development of its product candidates; Vaxxinity’s ability to obtain coverage, pricing or reimbursement for any approved products and acceptance from patients and physicians for any approved indications; delays or other challenges in the recruitment of patients for, or the conduct of, Vaxxinity’s clinical trials; challenges associated with supply and manufacturing activities; and Vaxxinity’s accounting policies. These and other important factors to be considered in connection with forward-looking statements are described in the "Risk Factors" section of Vaxxinity’s Annual Report on Form 10-K filed with the U.S. Securities and Exchange Commission on March 27, 2024. The forward-looking statements are made as of this date and Vaxxinity does not undertake any obligation to update any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by law. Investor Contact Mark Joinnides ir@vaxxinity.com Press Contact McKenna Miller vaxxinity@kcsa.com

Despite releasing clinical data over three years that including positive phase 3 results, Vaxxinity’s shares still plummeted from the original list price of $16.11. Vaxxinity, which filed to delist from the Nasdaq last month, is choosing radical transparency about the “abusive relationship” that has defined the immunotherapy medicine company’s three-year stint as a public company. “It's not the last you'll hear of us and we want people to know that it's not like we're just slinking away and giving up, so I think that was important,” CEO Mei Mei Hu said in an interview with Fierce Biotech. The company, which listed in November 2021, marked the decision to back off of the market with a detailed letter to shareholders in April, signed by Hu and fellow company founder and Executive Chairman Lou Reese. The executives noted the many factors that drove them to the decision, including the overall decrease in the Biotech XBI, the withdrawal of institutional support from the market and the drying up of liquidity. All these factors converged to push Vaxxinity into what Reese and Hu called “a downward spiral.” Despite releasing clinical data over the time period that included positive phase 3 results, receiving a fast-track designation from the FDA for its Parkinson’s disease program, moving two programs into the clinic and receiving $10 million in non-dilutive funding, Vaxxinity’s shares still plummeted from the original list price of $16.11. Prior to announcing the delisting in April, the stock was worth 42 cents. “Regardless of positive data, the markets would be selling into that because of a liquidity opportunity, right? And so those were new types of market dynamics. And when we saw that we said, ‘Look, in order to achieve our goal, which is to have this tremendous patient impact, we need to leave this abusive relationship, and we need to go and find relationships where we're valued,’” Reese said. That meant taking Vaxxinity private again. https://public.flourish.studio/visualisation/17958611/   An auspicious start Vaxxinity went public in what many now look back on as the heyday of modern biotech—2021, the second year of the COVID-19 pandemic. The debut was just months after Vaxxinity became the company it is now, when COVID-focused COVAXX and brain immunotherapeutics company United Neuroscience fused together as subsidiaries. The IPO raised $85 million at $13 per share, with the stock commencing trading on Nov. 11, 2021 under the ticker VAXX. Hu and Reese never got to ring the bell at the Nasdaq but others on the Vaxxinity team did. “We weren’t allowed in because we had COVID,” Reese said. While the legacy neurological assets remained in play, Vaxxinity, like everyone else at that time, kicked into gear to develop a COVID-19 shot. “When COVID came around, I think the whole world had to pivot. And it's amazing what we can do when we rally together for a singular cause and so we came in on the bandwagon,” Hu said. Vaxxinity tapped its Active Immunotherapy Medicine platform to develop a vaccine called UB-612. The shot went all the way to phase 3, going head-to-head with the now-approved option from Pfizer and BioNTech. But by the time UB-612 was ready to go, the world had moved on. Vaxxinity is not the only biotech to have a tale like this to tell after the pandemic years and there’s no regrets from Hu or Reese on pivoting to help the effort. “What it showed us is that we can execute. We can bring something from literally an idea to phase 3 positive news in like a matter of a couple years. The problem for us is that COVID disappeared … it's still around, but people got tired of it and it's no longer a thing and so that market opportunity went away,” Hu said. Vaxxinity went back to its original mission: Alzheimer’s and Parkinson’s. The company has UB-311 in phase 2 testing for the former and UB-312 in phase 1 for the latter. Another tau program called VXX-301 for Alzheimer’s is in the preclinical stage. “We actually had so many learnings from our COVID sprint,” Hu said. “If COVID were still here, we'd be in a different spot. And the good news with diseases like Alzheimer's and Parkinson's is that the disease isn't going away.” Throughout this entire journey, the markets kept hammering Vaxxinity. The price plummeted below $1. “We kept coming out with good news,” Hu reflected. “But then we began to notice that literally, when we had good news, the stock would go down. And it became a trend of selling into good news.” Vaxxinity’s executives tried to compartmentalize the market activity and the clinical work, focusing on delivering, on the advice of investors. But it became harder to do. Reese said the share price still reflected a bad picture out to the world and that was hard to stomach. It affected the morale of staff and painted a negative picture for anyone looking to work with the company, whether they be a potential employee or external partner. Reese said they watched as the Russell Index stayed down for three consecutive years, there was a 93% reduction in liquidity in terms of the money raised through IPOs. Vaxxinity was one of the last of 40 companies that went out in 2021 and only two were trading at or above their IPO price. Neither Hu or Reese could pinpoint an exact moment when they made the decision to delist. “Most of the time there’s not like a eureka moment,” Hu said. But Reese cites two key pieces of data. One of their peer companies—which he did not name—released earnings and beat all analyst forecasts. The stock dropped 10% anyway. “So that was the first one where I was like, this is actually fundamentally broken. It's not even a revenue-based issue. It's just broken,” Reese said. Then Vaxxinity released data on the conference circuit that he called positive, and still the company faced downward pressure. “Those two kinds of things really solidified the fact that it's not functioning. It's not a personal attack on me or Mei Mei or anybody that's doing great work at Vaxxinity,” Reese said. “It's just a market that fundamentally—based on the rules of the market for the last 35 years—is not functioning in that way.” And so, Reese and Hu penned a letter, which began: “It is important to share why we made this decision to ‘go dark’ and why we believe it is in the best interests of the company and our shareholders over the longer term.”   Starting a lawnmower Reese said transparency was important in this moment. “I feel like we gave it our all and we're gonna continue giving it our all, but we need people to know that we're not quitting. We're not giving up. We want to be transparent,” he said. “We understand why these things are a problem and why they're tough for shareholders to swallow and all of that and we want them to have as much information as they can have.” The executives also addressed the COVID shot and the decision to pivot right back to the neurodegenerative diseases that were originally the company’s mission. “We recognize that COVID is no longer a top global health priority, but if it were, we believe we would have a best-in-class vaccine offered at 10% of our competitors’ price, or put another way, we would be fulfilling our mission to limit suffering and increase access to the best healthcare solutions in the world," the letter read. The letter also stated that Hu and Reese expect better access to capital on the private side. The pair declined to say what their plans are for fundraising going forward. In the company’s last earnings release in March, they reported $30.4 million in highly liquid assets, including $4.9 million of cash and cash equivalents and $25.5 million of short-term investments. This compared to $86.8 million as of Dec. 31, 2022. Vaxxinity spent $3.7 million on directors and officers insurance to maintain the listing in the first year on the market alone, a necessary expenditure to have a Nasdaq listing, according to the letter. Reese and Hu suspect there are many biotechs out there considering the same thing and that Vaxxinity’s move could be just the start of a trend of voluntary delistings. “I hope that the companies make the best decisions that they can for their shareholders, whatever those are in their individual highly complicated circumstances,” Reese said. They have been watching the handful of companies go out so far this year in the first quarter, followed by another quiet period. Hu said the looming U.S. election, stubborn inflation and other macro factors are contributing to companies' hesitancy to list. “Have you ever started a pull lawnmower? So I think about it like that. They were sitting there and that was the first pull after it's been cold for a while. And they wanted to see if it would kick over. And the answer is it didn’t,” Reese said. “I think they pulled that motor, and it started a little bit, and then just chugged out and there was some black smoke and you knew that the fuel was too rich and it was flooding.”