Acumen Pharmaceuticals Reports Financial Results for the Year Ended December 31, 2023 and Business Highlights

• Initiation of a Phase 2 study, ALTITUDE-AD, to investigate sabirnetug (ACU193) for the treatment of early Alzheimer’s disease expected in the first half of 2024

• Initiation of a Phase 1 study to support a subcutaneous dosing option of sabirnetug expected in mid-2024

• Cash, cash equivalents and marketable securities of $306.1 million as of Dec. 31, 2023, expected to support current clinical and operational activities into the first half of 2027

• Company to host conference call and webcast today at 8:00 a.m. ET

CHARLOTTESVILLE, Va., March 26, 2024 (GLOBE NEWSWIRE) — Acumen Pharmaceuticals, Inc. (NASDAQ: ABOS) (“Acumen” or the “Company”), a clinical-stage biopharmaceutical company developing a novel therapeutic that targets toxic soluble amyloid beta oligomers (AβOs) for the treatment of Alzheimer’s disease (AD), today reported financial results for the full year ended December 31, 2023 and provided a business update.

“2023 was a landmark year for Acumen. We delivered the first Phase 1 results from an oligomer-targeted antibody for the treatment of early Alzheimer’s disease, which exceeded expectations. Beyond favorable safety results, our study confirmed near-maximal target engagement of abeta oligomers, significant plaque reduction and impressive improvements in fluid biomarkers for AD that together give us increased confidence that sabirnetug may offer a best-in-class therapeutic profile for patients,” said Daniel O’Connell, Chief Executive Officer of Acumen. “We have entered 2024 from a position of strength. Our team is laser-focused on advancing the clinical development of sabirnetug and expects to initiate our Phase 2 study in the first half of this year. We also expect to initiate a subcutaneous bioavailability study in mid-2024, to extend the product profile and offer administration optionality for patients. We look forward to sharing our progress with you throughout the year.”

Recent Highlights and Anticipated Milestones

Sabirnetug (ACU193) Clinical Development

• In March 2024, the Company presented fluid biomarker and target engagement analyses from Phase 1 INTERCEPT-AD study in AD at the International Conference on Alzheimer’s and Parkinson’s diseases (AD/PD).
  • Sabirnetug had an observed dose-dependent trend in the multiple ascending dose cohorts on CSF levels of p-tau181, total tau, neurogranin and the Aβ42/Aβ40 ratio, consistent with the downstream pharmacologic effects of the drug, after just three administrations. These findings are consistent with sabirnetug’s proposed mechanism of action and intended target engagement of AβOs. Additionally, the apparent effect of sabirnetug on downstream biomarkers such as p-tau181 and neurogranin are consistent with the hypothesis that oligomers drive the downstream neurodegenerative process in AD.
  • Additionally, Acumen presented a poster detailing its method to develop the first assay to directly measure target engagement of AβOs by an immunotherapy (as measured by sabirnetug-AβO complex in CSF) in the INTERCEPT-AD trial. These data also informed the development of a pharmacokinetic-pharmacodynamic (PK/PD) model, which ultimately demonstrated that the highest doses used in INTERCEPT-AD (60 mg/kg Q4W and 25mg/kg Q2W) approached maximal target engagement (Emax), as was presented in October 2023.
• The Company expects to initiate a Phase 2 study, ALTITUDE-AD, in the first half of 2024 to investigate the clinical efficacy, safety and tolerability of sabirnetug for the treatment of early Alzheimer’s disease.

• The Company expects to initiate a Phase 1 bioavailability study to support a subcutaneous dosing option of sabirnetug in mid-2024.

Corporate Updates

• In February 2024, the Company announced the appointment of Dr. James Doherty as President and Chief Development Officer.
  • Dr. Doherty’s responsibilities include oversight of clinical and nonclinical development, chemistry, manufacturing & controls and regulatory functions, reporting to Daniel O’Connell, Chief Executive Officer.
  • Dr. Doherty brings decades of neuroscience-focused research and clinical development expertise to Acumen, from discovery through drug approval. Prior to joining Acumen, Dr. Doherty served as Chief Development Officer at Sage Therapeutics, where the team achieved U.S. Food and Drug Administration approvals of two treatments for postpartum depression. Previously, he served as Director and Head of the Neuroscience Department for the Central Nervous System and Pain Innovative Medicines Unit of AstraZeneca Pharmaceuticals in Sodertalje, Sweden, where he led the company’s research pipeline for Alzheimer’s disease and neurodegeneration.

“Underpinning my decision to join Acumen at this transformative time in the Alzheimer’s field is the intriguing science behind AβO toxicity paired with Acumen’s impressive Phase 1 data. Not only does the data confirm sabirnetug’s selectivity for AβOs in patients, it also highlights that the drug can actively improve downstream biomarkers associated with AD, moving the amyloid beta discussion beyond plaque to focus on amyloid species toxic to synaptic function,” said Dr. Jim Doherty, President and Chief Development Officer of Acumen. “I am excited to help the team thoughtfully interrogate the multiple potential paths toward sabirnetug’s next-generation differentiation – via greater efficacy, safety or both – that would be beneficial to patients as compared to existing AD therapeutics.”

2023 Financial Results

• Cash Balance. As of December 31, 2023, cash, cash equivalents and marketable securities totaled $306.1 million, compared to cash, cash equivalents and marketable securities of $193.4 million as of December 31, 2022. This increase is due to the net proceeds from the Company’s public offering of approximately $122 million on July 21, 2023, as well as approximately $30 million from K2 HealthVentures as part of a debt financing of up to $50 million announced in November 2023. Altogether, this runway is now expected to be sufficient to support current clinical and operational activities into the first half of 2027.
• Research and Development (R&D) Expenses. R&D expenses in 2023 were $42.3 million, compared to $32.4 million in 2022. The increase in R&D expenses was primarily due to increased costs related to consulting, personnel and other costs.

• General and Administrative (G&A) Expenses. G&A expenses in 2023 were $18.8 million, compared to $12.9 million in 2022. The increase in G&A expenses was primarily due to increased costs related to personnel, consulting and legal/patent services.

• Loss from Operations. Losses from operations in 2023 were $61.1 million, compared to $45.2 million in 2022. This increase was due to the increased R&D and G&A expenses over the prior year period.

• Net Loss. Net loss for the year ended December 31, 2023 was $52.4 million, compared to a net loss of $42.9 million for the year ended December 31, 2022.

Conference Call Details

Acumen will host a conference call and live audio webcast today, March 26, 2024, at 8:00 a.m. ET.

To participate in the live conference call, please register using this link. After registration, you will be informed of the dial-in numbers including PIN. Please register at least one day in advance.

The webcast audio will be available via this link.

An archived version of the webcast will be available for at least 30 days in the Investors section of the Company’s website at www.acumenpharm.com.

About Sabirnetug (ACU193)

Sabirnetug (ACU193) is a humanized monoclonal antibody (mAb) discovered and developed based on its selectivity for soluble AβOs, which are a highly toxic and pathogenic form of Aβ, relative to Aβ monomers and amyloid plaques. Soluble AβOs have been observed to be potent neurotoxins that bind to neurons, inhibit synaptic function and induce neurodegeneration. By selectively targeting toxic soluble AβOs, sabirnetug aims to directly address a growing body of evidence indicating that soluble AβOs are a primary underlying cause of the neurodegenerative process in Alzheimer’s disease. Sabirnetug has been granted Fast Track designation for the treatment of early Alzheimer’s disease by the U.S. Food and Drug Administration.

About INTERCEPT-AD

INTERCEPT-AD was a Phase 1, U.S.-based, multi-center, randomized, double-blind, placebo-controlled clinical trial evaluating the safety and tolerability, and establishing clinical proof of mechanism, of sabirnetug in patients with early Alzheimer’s disease (AD). Sixty-five individuals with early AD (mild cognitive impairment or mild dementia due to AD) enrolled in this first-in-human study of sabirnetug. The INTERCEPT-AD study consisted of single-ascending-dose (SAD) and multiple-ascending-dose (MAD) cohorts and was designed to evaluate the safety, tolerability, pharmacokinetics (PK), and target engagement of intravenous doses of sabirnetug. More information can be found on www.clinicaltrials.gov, NCT identifier NCT04931459.

About Acumen Pharmaceuticals, Inc.

Acumen, headquartered in Charlottesville, VA, with additional offices in Indianapolis, IN and Newton, MA, is a clinical-stage biopharmaceutical company developing a novel therapeutic that targets toxic soluble amyloid beta oligomers (AβOs) for the treatment of Alzheimer’s disease (AD). Acumen’s scientific founders pioneered research on AβOs, which a growing body of evidence indicates are early and persistent triggers of Alzheimer’s disease pathology. Acumen is currently focused on advancing its investigational product candidate, sabirnetug (ACU193), a humanized monoclonal antibody that selectively targets toxic soluble AβOs, following positive results in INTERCEPT-AD, a Phase 1 clinical trial involving early Alzheimer’s disease patients. For more information, visit www.acumenpharm.com.

Forward-Looking Statements

This press release contains forward-looking statements within the meaning of The Private Securities Litigation Reform Act of 1995. Any statement describing Acumen’s goals, expectations, financial or other projections, intentions or beliefs is a forward-looking statement and should be considered an at-risk statement. Words such as “believes,” “expects,” “anticipates,” “could,” “should,” “would,” “seeks,” “aims,” “plans,” “potential,” “will,” “milestone” and similar expressions are intended to identify forward-looking statements, although not all forward-looking statements contain these identifying words. Forward-looking statements include statements concerning Acumen’s business, and Acumen’s ability to achieve its strategic and financial goals, including its projected use of cash, cash equivalents and marketable securities and the expected sufficiency of its cash resources into the first half of 2027, the therapeutic potential of Acumen’s product candidate, sabirnetug (ACU193), including against other antibodies, the anticipated timeline for initiating a Phase 2 clinical trial of sabirnetug and a Phase 1 trial to support a subcutaneous dosing option of sabirnetug, and the expected use of proceeds from a credit facility. These statements are based upon the current beliefs and expectations of Acumen management, and are subject to certain factors, risks and uncertainties, particularly those inherent in the process of discovering, developing and commercializing safe and effective human therapeutics. Such risks may be amplified by the impacts of geopolitical events and macroeconomic conditions, such as rising inflation and interest rates, supply disruptions and uncertainty of credit and financial markets. These and other risks concerning Acumen’s programs are described in additional detail in Acumen’s filings with the Securities and Exchange Commission (“SEC”), including in Acumen’s most recent Annual Report on Form 10-K, and in subsequent filings with the SEC. Copies of these and other documents are available from Acumen. Additional information will be made available in other filings that Acumen makes from time to time with the SEC. These forward-looking statements speak only as of the date hereof, and Acumen expressly disclaims any obligation to update or revise any forward-looking statement, except as otherwise required by law, whether, as a result of new information, future events or otherwise.

CONTACTS:

Investors:
Alex Braun
abraun@acumenpharm.com

Media: AcumenPR@westwicke.com