Seres Therapeutics, Inc.

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Thank you and good morning. Our press release for the company's second quarter 2025 financial results and business updates became available at 7 a.m. Eastern time this morning and can be found on the Investors in Use section of the company's website. The company has also posted an updated corporate presentation to the website. I'd like to remind you that we're making forward-looking statements including statements about the timing and results of our clinical studies and data readouts, future product candidates, clinical development plans and commercial opportunities, communications with feedback from or submissions to the FDA, operating plans and our future cash runway, future obligations related to the vows sale, our ability to secure a business development deal, partnerships and or generate or obtain additional capital or financing, our planned strategic focus, anticipated timing of any of the foregoing and other statements which are not historical fact. Actual results may differ materially. Additionally, these statements are subject to certain risks and uncertainties which are discussed under the risk factor section of our recent SEC filings. Any forward-looking statements made on today's call represent our views as of today only. We may update these statements in the future but we disclaim any obligation to do so. On today's call with prepared remarks, I'm joined by Morela Thorell, co-CEO and CFO and Matthew Penn, Chief Scientific Officer. Additional members of the management team including Tom DeRosier, co-CEO and Chief Legal Officer, Terry Young, Chief Commercial and Strategy Officer and Dennis Walley, MD, Senior Vice President of Clinical Development will also be available during the Q&A portion of the call. And with that, I'll pass the call on to Morela.

Thank you, Carlo, and good morning, everyone. Today we'll share recent business highlights, progress on CR 155 development activities and an update on our efforts to obtain additional resources to enable continued advancement of our programs. CERES has continued making meaningful progress toward our mission of bringing novel live biotherapeutic products to patients in need. Our efforts and results to date have clearly demonstrated both the therapeutic power of this modality with highly compelling clinical data sets and two breakthrough therapy designations achieved and CERES capabilities to successfully obtain FDA approval. Looking ahead, we are optimistic about the promise of our live biotherapeutics to provide transformative clinical benefits to patients, including for serious infections and inflammatory diseases that affect a large patient population. We have advanced preparation of CR 155 for the next stage of development. As a reminder, our previously completed CR 155 Phase 1B study provided highly promising results that supported continued development. The study showed that CR 155 administration resulted in a 77% relative risk reduction in bloodstream infections compared to placebo in patients undergoing allogeneic hematopoietic stem cell transplant, or AlloHSCT, resulting in a number needed to treat of three to prevent one bloodstream infection. This represents a compelling outcome for this high-risk patient population in need of better options. CR 155 was generally well tolerated in the study, consistent with the placebo-like safety profile we've seen historically across our live biotherapeutic product platform. The clinical results generated to date underscore the potential of CR 155 to redefine the standard of care for AlloHSCT recipients and many other vulnerable patient groups at risk of bloodstream infections. Guided by our constructive FDA feedback, we submitted a Phase 2 protocol to the FDA. We are pleased with the productive interactions we've had with the FDA to date, which have been facilitated by CR 155 having breakthrough therapy designation. The FDA has remained highly engaged and has indicated that they will provide further forward feedback on the protocol in the near future, which we expect will support finalizing the study design. The proposed Phase 2 study is designed to be a well-powered, placebo-controlled study with an enrollment goal of approximately 248 participants undergoing AlloHSCT and with the primary endpoint of prevention of bloodstream infections. The study employs an adaptive design with an interim data analysis once approximately half of the enrolled participants have reached the primary endpoint. Based on our operational plans and anticipated enrollment, we believe we could obtain interim results within 12 months of study initiation, thereby rapidly informing next steps in AlloHSCT development, including potential engagement with the FDA on the design of a registrational study. Those data could also support the pursuit of additional clinical development opportunities targeting adjacent patient populations at elevated risk of bloodstream infections, such as patients undergoing autologous HSCT. We believe these indications, as well as additional target populations that we have discussed in the past, represent multiple substantial commercial opportunities for CERES. If successful, we expect that the results from the planned Phase 2 study would represent a very meaningful value inflection point for the company and could support advancing to a single registrational study for approval of CR155 in AlloHSCT. In conjunction with the development of the study protocol, we have continued to progress operational preparations for the study, including commencing study startup activities with our CRO and advancing the manufacture of clinical supply. We are optimistic about the prospects for CR155 and our broader pipeline. We are also mindful of the capital and resources required to effectively advance these projects. We are also aware of the challenges that we face in the development of the study program, as well as the continued challenging biotech environment. Our immediate top corporate priority is to obtain capital to enable our promising development candidates, starting with CR155, to progress to meaningful clinical milestones. The types of transactions we are evaluating include partnerships, outlicensing deals, mergers, and other types of structures with counterparties who could provide capital and other resources and which aim to leverage CERES expertise and track record in successfully bringing a live biotherapeutic product to the market. We are in active discussions with multiple parties aiming to secure a deal. In conjunction with these efforts, we also continue to evaluate potential cost reduction actions to extend our cash runway. With that, I'll turn the call over to Matt to discuss recent scientific progress.

Thanks, Mirella. I'd like to review some of our recently presented data from our CR155 and additional biotherapeutic programs. At the May ASCO meeting, we presented new exploratory biomarker data from the CR155 Phase 1b study. These biomarker data provided evidence of the potential of CR155 to promote immune reconstitution following AlloHSCT through the modulation of homeostatic cytokines and peripheral T-cell expansion. The results highlight the potential role of CR155 in promoting peripheral T-cell recovery and immune reconstitution to support favorable outcomes post AlloHSCT. Based on the CR155 clinical results to date, as well as our other mechanistic data, we believe that CR155 could provide benefit to a range of patient populations at risk of bloodstream infections and other conditions. I'd like to also provide an overview of our recent activities focused on the development of our live biotherapeutics for the treatment of inflammatory and immune diseases. In May, we presented data at the Digestive Disease Week conference that reported the identification of biomarkers that can identify patients with microbiome-driven disease and that can predict response to both existing IBD therapeutics and live biotherapeutic interventions. We were pleased to see that our poster, entitled Candidate Biomarkers of Microbiome Disruption for Patients Selection or Stratification in Clinical Trials of Microbiome Therapies and Ulcerative Colitis, received a Poster of Distinction Award in the Microbiome and Microbial Therapies subgroup. We believe that the findings presented support the potential of live biotherapeutics as a novel treatment notability for gut-related inflammatory and immune diseases and suggest that sizable patient subpopulations well suited for this approach may be identified. In conjunction with the partnership opportunities that Mirella mentioned, we are exploring potential R&D partnerships to advance our development of our investigational live biotherapeutics in inflammatory and immune diseases, including ulcerative colitis and Crohn's disease. These conditions impact large patient populations and biotherapeutics could provide a therapeutic approach that is highly differentiated from other drugs that are currently in use or in development with opportunities for both monotherapy and combination therapy. Additionally, the company is collaborating on an investigator-sponsored trial with the Memorial Sloan Kettering Cancer Center to evaluate the use of SIR155 for immunotherapy-related enteroclitis, also referred to as IREC. Ceres is providing investigational product for the study. IREC is among the most frequent and severe immune-related adverse events and recipients of immune checkpoint inhibitor therapy and is observed in 35 to 50 percent of patients undergoing this cancer treatment. Immune checkpoint inhibitors can cause a wide range of immune-related adverse events with links to T-cell biology and epithelial barrier inflammation, biological functions known from our preclinical studies and clinical pharmacology data to be positively impacted by SIR155. Positive data from this study would provide further support for the expansion into additional indications likely well-suited for our biotherapeutic approach. With that, I'll turn the call back to Merle.

Thank you, Matt. I'll now turn to second quarter financial results. As a reminder, Ceres has classified all historical operating results for the VAUST business within discontinued operations in the consolidated statements of operations for the comparative periods presented, and there was no activity in this quarter related to discontinued operations. Ceres reported a net loss from continuing operations of $19.9 million in Q2 2025 as compared to $26.2 million in the second quarter of 2024. Research and development expenses for this quarter were $12.9 million compared to $15.8 million in the second quarter of 2024, reflecting lower costs related to the completion of the SIR155 Phase 1B study, lower personnel expenses, and a decrease in platform investments. General and administrative expenses were $10.3 million in the quarter compared to $13.1 million in Q2 2024, driven primarily by lower personnel and related expenses, including IT related. In July, we received the $25 million installment payment due from Nestle as expected. As of June 30, 2025, we had cash and cash equivalents of $45.4 million. Based upon our current cash balance, the $25 million payment received, VAUST transaction related obligations, and current operating plans, we expect to be able to fund operations into the first quarter of 2026. We have implemented and continue to evaluate potential cost reduction actions to extend our cash runway. As I conclude, Tom, I, and the entire CERES team would like to take a moment to acknowledge and thank Eric Schaff for his significant contributions to the company over the past decade. During Eric's tenure, CERES led the maturation of the biotherapeutic field and successfully delivered the first ever FDA approved oral microbiome therapy to patients. We are pleased to continue benefiting from Eric's perspective as he remains a member of the CERES board. We also welcome Rob Rossiello, an executive partner at Flagship Pioneering, who will be joining our board as Paul Biondi, also of Flagship, transitions off. We thank Paul for his service on the board. To summarize, we are making good progress advancing CR 155 to enable readiness for the Phase II study. We are also progressing our efforts to secure capital and resources to enable the continued development of CR 155 that could capture substantial therapeutic and commercial opportunities. Operator, you may now open the call for questions.

At this time, I would like to remind everyone in order to ask a question, press star then the number one on your telephone keypad. We will pause for just a moment to compile the Q&A roster. Your first question comes from the line of Joseph Foam with TD Cowens. Please go ahead, the line is now open.

Hi there, good morning and thank you for taking my questions. Maybe the first one just on the potential deals, you obviously indicated a various amount of options with different structures here. I guess, how will you decide the best structure for a series when finishing up a deal, a potential deal going forward? What would be the ideal structure for the team and the investor base in your opinion? And then second, I saw on the corporate deck that you highlighted encouraging feedback from European physicians on CR 155. I guess, is there plans to include the EU in the phase two? And do you believe that the EMA would accept the trial design that you've been going back and forth on with the FDA? Thank you.

Great, good morning Joe and thank you for your questions. First, with respect to the structure of a BD deal. Yes, we are exploring a number of different structures and there are many types that could make sense for the company. In the first instance, we're looking for an opportunity that provides capital to meaningfully advance our CR 155 program. There also are various capabilities that counterparties bring that would be helpful and I think that's a positive to our resources and experience, for example, experience conducting a global study. There are also structures, we mentioned mergers as a potential where we could also leverage or the counterparty could leverage the expertise and success that series has had getting a product approved through the FDA in the microbiome field. But I'd also offer my co-CEO Tom to provide his thoughts.

Yes, sure. Thanks, Mirella. Hey, Joe. As you recall, for months we've been talking about our 155 partnership process and that continues. We are having discussions with companies about a somewhat simple partnership process with CR 155. But interestingly, during that process, a banker called us and suggested that maybe as the leader in the space with all the success we've had with FDA that maybe we would be interested in leading a roll-up of the microbiome company space. That seemed to us to be a bit too complex, but it did get us thinking that perhaps a merger with a live biotherapeutic company with clinical stage assets and a new different set of investors might be an interesting thing to explore, particularly a company who needs our expertise in clinical and regulatory manufacturing. So we actually reached out to a few and coincidentally or maybe not coincidentally, one reached out to us. And we continue to be in multiple discussions on such a merger. Of course, your question, what would be best for us, we are certainly looking for substantial financial support for what we're doing and in any such of a merger process, we would need to have it be financeable. But we're optimistic given the activity that we have going now. We're optimistic that we'll have a deal to decide whether to do and maybe multiple deals to pick from. I'd also say it's been really interesting to hear Commissioner McCary talk about the importance of microbiome, healthy microbiome in the health of the population. And we're excited that FDA is so excited about the microbiome opportunity. So we remain optimistic. As Morella said, the market's tough out there, no guarantees, but we're going to continue to work hard on our PD process.

Thanks, Tom. And your second question regarding EU feedback. Yes, robust interaction with EU KOLs. The phase two study will be a global study, including European countries. Importantly, the design of the phase two study is very robust. It's well powered. And so we are excited about the potential receptivity of EMEA, whom we will engage at the appropriate time regarding the study design. But I'll ask Dennis if he has any further comments to add.

Yes, thank you, Morella. I would like to add that we did have a number of engagement conversations with KOLs in the EU. And we heard the same message that we have heard from our US-based KOLs, that is bloodstream infections in this LHST population are still a major problem and a major unmet need. And every one of them was absolutely excited to be able to participate in a study looking at CR155 with such a novel approach to a problem that has not been solved yet.

Perfect. Thank you so

much.

Thank you, Joe. That concludes our Q&A session. I will now turn the call back over to the management for closing remarks.

Thank you very much for joining the call today, and have a great day.

That concludes today's call. Ladies and gentlemen, thank you all for joining. You may now disconnect everyone. Have a great day.