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Ladies and gentlemen. Thank you for standing by. Welcome to Acumen Pharmaceuticals Full Year 2023 Conference Call and Webcast. At this time, all participants are in a listen-only mode. After the speakers’ presentation, there will be a question-and-answer session. [Operator Instructions]. Please be advised that today’s conference is being recorded. I would like now to turn the conference over to Alex Braun, Head of Investor Relations. Please go ahead.

Thanks Michelle. Good morning, and welcome to the Acumen conference call to discuss our business update and financial results for the year ended December 31, 2023. With me today are Dan O'Connell, our Chief Executive Officer; Dr. Jim Doherty, our President and Chief Development Officer; Dr. Eric Siemers, our Chief Medical Officer; and Matt

Thanks Alex. Good morning and thanks to everyone who is joining us today. 2023 was a landmark year for Acumen. Our monoclonal antibody for the treatment of Early Alzheimer’s Disease ACU193 which recently received its non-proprietary name Sabirnetug delivered positive and exciting Phase 1 results first presided at AIC last July. You will hear more about these results and how they serve as the cornerstone for establishing Sabirnetug’s differentiated therapeutic profile later on this call. More recently we welcomed Dr. Jim Doherty to Acumen as President and Chief Development Officer. Jim brings many years of experience in CNS drug development and we are delighted to have him join our leadership team. We believe Acumen entered 2024 from a position of strength. We remain highly focused on the execution of key program and strategic initiatives to further establish the therapeutic potential of Sabirnetug’s best in class treatment option for the substantial early Alzheimer’s patient population. This month we presented additional CSF biomarker data and details about our A-beta oligomer target engagement assay from our Phase 1 INTERCEPT-AD study at the international conference on Alzheimer’s and Parkinson’s disease or ADPD. We will also present analysis at the American Academy of Neurology Meeting in Denver this April which will introduce the development plan for Sabirnetug and the results from INTERCEPT-AD to this broad group of practicing and academic Neurologists. If you haven't already taken a look at our Phase 1 results in their entirety, I encourage you to go to our website, where you can find archived presentations, webcasts, and releases detailing the Sabirnetug data. For us, it's difficult to overstate the significance of these results and how they position Sabirnetug in the broader anti A-beta field. We knew going into our Phase 1 study that's Sabirnetug possessed high selectivity for A-beta oligomers. Why does this matter? Unlike A-beta monomers and insoluble amyloid plaque, A-beta oligomers are toxic and distinct in important ways, in particular to neurons and synapses. Our approach with Sabirnetug is to selectively target toxic A-beta oligomers and as a consequence to protect synapses in a way that may provide additional therapeutic benefit to patients especially from an efficacy perspective. The INTERCEPT-AD results exceeded our expectations and provide a substantial amount of data indicating Sabirnetug’s drug effect. Overall, we see multiple paths towards Sabirnetug’s next generation differentiation on efficacy, safety, or both, any of which would be beneficial to patients as compared to existing options. I'm pleased to note that we're making great progress with the launch of our Phase 2 study ALTITUDE-AD, which remains on track to initiate in the first half of this year. Simultaneously, we are also on track to initiate our subcutaneous Phase 1 study expected for mid-2024. With that, I'd like to hand the call over to Eric.

Thanks, Dan. And thanks to those listening in to the call today. I'm very pleased with the progress with the clinical development of Sabirnetug last year and thus far in 2024. With our achievements last year, we are well positioned to potentially deliver a differentiated treatment to the Alzheimer's community. I'll provide a brief update on feedback we've received from the scientific community on our Phase 1 INTERCEPT-AD results, and then review our study design for our next trial ALTITUDE-AD. Recall that our Phase 1 top line results were announced in July of last year at AIC and we had subsequent updates throughout the second half of the year on the fluid biomarker results as those were analyzed. The totality of the Phase 1 data has only recently become available and can now be evaluated by the broader external community. We believe the fluid biomarker results have helped to relate the mechanism of Sabirnetug to its downstream pharmacologic activity. As first reported in July, a dose dependent increase in target engagement approaching an Emax was found in CSF and a reduction in plaque measured by amyloid PET was seen at the highest doses of Sabirnetug in the multiple-ascending dose cohorts. Importantly, after just three administrations of Sabirnetug in the multiple ascending dose portion of the study, patients demonstrated downstream improvements across TAU and amyloid biomarkers in CSF, which are the two main pathologic hallmarks of Alzheimer's disease. Remarkably, there were additional clear effects on synaptic biomarkers suggesting Sabirnetug's target engagement of neurotoxic oligomers may protect synapsis after only three administrations of drug. As Dan mentioned, our team recently returned from ADPD in Lisbon. The feedback to our data package at medical conferences has been very positive. The excitement around our INTERCEPT-AD results caused us to be even more enthusiastic about beginning our next study, ALTITUDE-AD. ALTITUDE-AD is planned as a randomized, double-blind, placebo-controlled three-arm study designed to evaluate the clinical efficacy, safety, and tolerability of Sabirnetug with approximately 180 participants per arm for a total of 540 participants with MCI or mild dementia due to Alzheimer's disease. We intend to use the iADRS at 18 months as the primary outcome measure. The study is planned to include a one-year open-label extension. Based on the results from INTERCEPT-AD, the doses for ALTITUDE-AD will be 35 milligrams per kilogram and 50 milligrams per kilogram, both dosed every four weeks. Extensive PK/PD modeling of our Phase 1 data, especially with regard to target engagement and consideration of safety data led to the selection of these doses. Both of these dose levels may produce clinical efficacy and we are keen to see whether they will differentiate in terms of the overall benefit risk ratio. Importantly, this study is designed as a registration-eligible study for Sabirnetug, and we look forward to providing further updates as the study initiates and progresses. In short, our Phase 1 results have allowed us to move to our next study that will more definitively investigate how uniquely targeting A-beta oligomers may lead to a best-in-class treatment for patients with Alzheimer's disease. And with that, I'll turn the call over to Jim.

Thanks, Eric and good morning, everyone. I would like to thank Dan and the entire team at Acumen for their warm welcome. I've been onboard for nearly two months now and in that time, I've grown even more excited about the potential for A-beta oligomer selectivity to offer a next-generation Alzheimer’s treatment. At its heart, I see the Sabirnetug program as testing a very clear hypothesis. A-beta oligomers are neurotoxic amyloid species in the brain. By targeting these oligomers, Sabirnetug may offer a differentiated profile compared to other AD therapies, including the potential for greater efficacy or reduced side effects like ARIA. The Phase 1 INTERCEPT-AD results show that Sabirnetug can indeed bind to its intended target and improve downstream Alzheimer's biomarkers. We believe there is great potential for this approach to be beneficial to patients and it's incumbent on us to progress our clinical program efficiently and strategically to maximize Sabirnetug's value for patients and shareholders. To support the ALTITUDE-AD trial, we have contracted with a highly experienced CRO with a strong track record in AD that should provide advantageous for trial recruitment and site readiness. As Dan mentioned earlier, we are also planning to initiate a Phase 1 bioavailability study in healthy volunteers for a subcutaneous formulation of Sabirnetug in mid-2024. We believe a competitive product profile for Sabirnetug includes a subcutaneous option to offer additional flexibility and convenience for patients and caregivers, and we have a productive collaboration with Halozyme for that work stream. Before I turn the call over to Matt, I'd like to take a moment to highlight the excitement we observed at the 2024 ADPD Conference a few weeks ago. We are clearly entering a new era for the diagnosis and treatment of Alzheimer's disease with novel therapeutics, increasingly more precise biomarkers, and diagnostics that will in turn help the field develop even better treatments. Having just recently joined Acumen, I can clearly sense to the team's pride in how the INTERCEPT-AD biomarker data have contributed to the perception that AD is a treatable disease. In particular, the effects observed on downstream fluid biomarkers after only three administrations of drug underscore the potential of Sabirnetug in targeting A-beta oligomers for the treatment of early AD. We believe Sabirnetug's clinical development will continue to move this field forward from this perspective. And now I'll hand the call over to Matt to discuss the financials.

Thanks, Jim. As a reminder, our full year 2023 financial results are available in the press release we issued this morning and in our 10-K we will file later today. We ended 2023 with approximately $306 million in cash and marketable securities on the balance sheet, which provides us with the financial resources to deliver against our strategic objectives. The increase from the prior year is due to the net proceeds from our public offering last July of approximately $122 million as well as approximately $30 million from K2 HealthVentures as part of the debt financing we announced in November of up to $50 million. Our cash on hand is expected to support our current clinical and operational activities into the first half of 2027. R&D expenses were approximately $42.3 million in 2023. The increase over the prior year was primarily due to increased costs related to materials, drug manufacturing costs, consulting, and personnel. G&A expenses were $18.8 million in 2023, with the increase over the prior year, primarily the result of costs related to personnel and consulting. This led to a loss from operations of $61.1 million in 2023. Our positive Phase 1 results in 2023 are a clear reflection of our strong drug development capabilities, which we have further elevated with Jim's experience and insight. We are well capitalized to execute on our upcoming Phase 2 ALTITUDE-AD study and to develop a subcutaneous formulation. We are committed to delivering on the opportunity ahead of us and look forward to providing additional updates this year as we advance Sabirnetug for the benefit of patients, caregivers, and shareholders. And with that, we can open the call for Q&A. Operator?

Thank you. [Operator Instructions]. The first question comes from Neena Bitritto-Garg with DB. Your line is open.

Awesome, thank you.

One moment for our next question. The next question comes from Thomas Shrader with BTIG. Your line is open.

Thank you.

One moment for the next question. The next question comes from Paul Matteis with Stifel. Your line is open.

Yes, sure. Thanks, Dan. So for our Phase 2 ALTITUDE-AD study, as I mentioned, it's 540 participants with 180 per arm. That for the iADRS gives you pretty typical power for a Phase 2 study. So we feel like that should really answer the question in terms of how the program develops. We'll also look at a variety of biomarkers, most of which we looked at in our Phase 1 study too. And so it will be really interesting to see after 18 months of treatment, TAU's biomarkers response since we actually already saw a response after just three doses in essentially three months. So we're looking forward to that. In terms of what goes into the interim analyses, we're not going to get into details about that. I guess I can say that it's an algorithm that doesn't include just one thing. And so -- and again, as Dan mentioned, the utility of that is to reduce the white space between a Phase 2 and a Phase 3 trial because if the algorithms look positive, one of the things that it tells you is that the study design of the Phase 2 study is good. And a lot of times, what creates white space in drug development programs is redesigning studies. And if we don't have to do that, that will cut down on our white space. So that's how we plan to use those algorithms.

Thanks, that’s super helpful.

One moment for the next question. The next question comes from Colin Bristow with UBS. Your line is open.

Yes. No, I think those are all great questions and all questions that we really don't have an answer to at this early point. I mean we don't have even our healthy volunteer data yet. So those are all things to be considered. I think it's interesting that broadly in the field, people are talking about maybe starting with -- starting off with IV administration and then switching to subcutaneous as more of a maintenance dose. So that's not just something that we're thinking about. It's something that a lot of people are thinking about. But we'll just need to get actual data before we start to narrow things down on those questions.

One moment for the next question. The next question comes from Geoff Meacham with Bank of America. Your line is open.

Good morning. This is Jason on for Geoff. Thank you so much for taking our questions. And congratulations on the progress. I wanted to ask maybe a little bit more broadly, we've seen the publication of a number of recent studies that have found that a number of the signals or biomarkers for amyloid beta appear quite some time before the symptoms. I think specifically regarding the ratio of A-beta 42 to A-beta 40 pops up 14 years prior to the onset of symptoms. And I'm curious, has that influenced the design of some of your clinical studies, do you think you may need to go a little bit earlier, or do you feel that kind of early AD is sufficient enough for kind of either a reversal of the symptoms or delaying them?

Yes. So Dan, do you want me to take that one, it is a great question. So yes, one of the ways that the field has made some real progress in the last 10 years and maybe even the last 20 years is the understanding of this fact that, as you point out, that you develop the plaques 15 to 20 years before you develop any symptoms. And there has been a thought in the field that if you were going to target amyloid or A-beta in one way or another, that because of that time period, you actually had to do it before people had any symptoms at all. And there are ongoing studies and they have been ongoing. There have been studies of what's called preclinical Alzheimer's disease. So in other words, you have the plaques, but you don't have any symptoms yet. Thus far, none of those studies have been successful. I think there's a lot of reasons for that. Partly, the study design is much more complicated. The studies need to be longer or some technical reasons why that's a challenge. But what's really important, I think, is that for drugs like Lecanemab and Donanemab and potentially even Aducanumab, you're seeing a signal in people who have either MCI or mild dementia with Alzheimer's pathology. And the reason why that's so important is that means you don't have to go all the way back to that preclinical stage where the study designs are much more challenging and not as well worked out. So we feel really good about the fact that we are in this population of MCI plus mild dementia. Other drugs are starting to see a signal there. And apparently, what that means is that's not too late in the process. And that's, I think, a really good insight for the field broadly.

Interesting, thanks for the color. And then maybe a quick follow-up, if I may. The FDA released draft guidance for Alzheimer's earlier this month. I think one of the big takeaways here is that really codified the driver push to maybe shorten the length of clinical studies potentially using, again, kind of biomarkers and other indicators rather than waiting for several years that it might take to detect a meaningful change. And I'm again kind of curious, has that translated to your discussions with the regulators and again, are we thinking ahead to maybe a shorter Phase 3 if need be?

Yes, having read the draft guidance like a lot of times for these draft guidance, it's a little hard to read between the lines, and they certainly did have some language in there about shortening timelines based on using biomarkers, but then they talk about a validated biomarker but what is validated to really mean. So there's still a number of things that need to be worked out. It may be that they were directing some of those comments to just taking an antibody that is IV and then converting it to subcutaneous. I think that's probably the most straightforward case for more of a reliance on the biomarkers. But at this early stage, we've not really considered using a biomarker alone to try to get accelerated approval for Sabirnetug because, of course, the payers, at least to this point, haven't really offered to reimburse for accelerated approval. So we'll continue to watch that very closely. But at this point, I don't think we have enough information to make any real changes in what we would anticipate would be our Phase 3 design.

Got it. Thanks again for the color.

One moment for our next question. The next question comes from Ananda Ghosh with H.C. Wainwright. Your line is open.

Hey, hi, thank you. The first question is probably what are some of the advantages of iADRS over CDR-SB and the rationale behind choosing iADRS over CDR-SB for the ALTITUDE study? And the second thing is there has been a lot of correlations made based on how much of plaque reductions you were seeing and what's the probability of success in terms of some of these anti-A-beta immunotherapy trials. Are there other associations, which has been done with other biomarkers such as TAU 181 or 217, where at least some modeling-based studies can tell you to what extent you might need to see a change in these two biomarkers so as to kind of have an impact in either CDR-SB or iADRS? Thanks.

Yes, I can try to take that one, too. As far as the use of the iADRS versus the CDR Sum of Boxes, one of the things that was interesting in the recent draft guidance was that they no longer called out the CDR Sum of Boxes. And they've actually presented it at public meetings, the idea that in the previous draft guidance where they did mention the CDR Sum of Boxes, they didn't mean to endorse that as sort of the only scale. But what they did say in this most recent draft guidance is that a scale that's a composite of cognitive measures and functional measures may have real utility. And that's what the iADRS is. It's a combination of cognitive measures from ADAS-Cog and then functional measures from a scale called ADCS-ADL. So we think that it's very positive actually in terms of our use of the iADRS. I would assume that [indiscernible] the trailblazer studies, that's their primary. They were happy to see that. So yes, I think that's a really good clarification from FDA in terms of that -- those kind of scales. In terms of correlations between plaque reduction and clinical benefit, I think what's really becoming a consensus opinion now is that you actually have to get plaque below a certain threshold. And this is something that we at Acumen been saying for a long time is that if you're going to target plaque, you have to basically get rid of it. And so the goal seems to be based on existing data that you want to get below 25, say -- or at most 30. So if you want to -- if your target is plaque, that's what you need to do. But again, our target is not plaque. Our target is oligomer. So it will be interesting to see what effects we have on plaque. But with our differentiated mechanism, that's really not the construct of our development plan.

Thanks.

I show no further questions at this time. I would now like to turn the call back over to Alex Braun for closing remarks.

Thanks, Michelle, and thanks for everyone for taking the time to tune in today. We are always available at the company. For any follow-up questions, please be in touch and have a great day. Thanks.