Seres Therapeutics reduces workforce by 25% to prolong cash reserves until Q2 2026.
Written by Emily J. Thompson, Senior Investment Analyst
Updated: Sep 23 2025
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Should l Buy MCRB?
Source: SeekingAlpha
Cost-Cutting Measures: Seres Therapeutics plans to reduce its workforce by about 25% to trim operating costs, which is expected to extend its cash runway into the second quarter of 2026.
SER-155 Study Development: Following positive FDA feedback, the company aims to finalize the Phase 2 study protocol for SER-155, targeting bloodstream infections in adults undergoing stem cell transplants, while seeking capital to support this and other biotherapeutic developments.
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Analyst Views on MCRB
Wall Street analysts forecast MCRB stock price to rise
2 Analyst Rating
2 Buy
0 Hold
0 Sell
Moderate Buy
Current: 8.740
Low
22.00
Averages
22.00
High
22.00
Current: 8.740
Low
22.00
Averages
22.00
High
22.00
About MCRB
Seres Therapeutics, Inc. is a clinical-stage company focused on improving patient outcomes in medically vulnerable populations through novel live biotherapeutics. It is developing SER-155, which has shown a significant reduction in bloodstream infections and related complications (as compared to placebo) in a Phase 1b clinical study in patients undergoing allo-HSCT and Fast Track designation to reduce the risk of infection and graft-versus-host disease in adults undergoing allo-HSCT. SER-155 and the Company’s other pipeline programs are designed to target multiple disease-relevant pathways. In addition to allo-HSCT, it intends to evaluate SER-155 and other cultivated live biotherapeutic candidates in other medically patient populations, including autologous-HSCT patients, cancer patients with neutropenia, CAR-T recipients, individuals with chronic liver disease, solid organ transplant recipients, as well as patients in the intensive care unit and long-term acute care facilities.
About the author
Emily J. Thompson
Emily J. Thompson, a Chartered Financial Analyst (CFA) with 12 years in investment research, graduated with honors from the Wharton School. Specializing in industrial and technology stocks, she provides in-depth analysis for Intellectia’s earnings and market brief reports.
Seres Therapeutics Pauses SER-155 Investment Amid Funding Challenges
- Investment Pause: Seres Therapeutics announced a pause on additional investments for its mid-stage trial, resulting in a ~25% drop in premarket trading, indicating significant funding challenges for its lead asset SER-155.
- Focus on Early Programs: The company will shift its focus to earlier-stage programs, including a fully enrolled study for SER-155 in immune checkpoint-related enterocolitis, expected to generate data by early Q2 2026, highlighting potential market demand for cancer therapies.
- Layoff Plans: Seres plans to lay off nearly 30% of its workforce to extend its cash runway through Q3 2026, a move aimed at streamlining operations and reducing costs to support the development of its early-stage pipeline.
- Regulatory Preparedness: CEO Marella Thorell stated that the company has taken extensive steps to prepare for a robust SER-155 Phase 2 study, including submitting a final protocol to the FDA, demonstrating commitment and confidence in future research.
See More
Seres Pauses SER-155 Phase 2 Study Amid Cost-Cutting Measures
- Study Pause Reason: Seres announced the pause of the SER-155 Phase 2 study following the completion of site evaluation and qualification with its contract research organization, despite the drug substance already being manufactured, which could hinder future R&D progress.
- Strategic Shift: The company will refocus its operations on high-value early-stage pipeline programs, particularly those targeting inflammatory bowel disease (IBD), aiming to seek greater market opportunities amid limited resources.
- Cash Runway Extension: Through cost-cutting measures, including a 30% workforce reduction, Seres expects to extend its cash runway into Q3 2026, which will support the continued development of immune-related disease programs while seeking additional funding for the SER-155 Phase 2 study.
- Market Reaction: While retail sentiment on Stocktwits remains in the 'bullish' territory, MCRB stock has fallen 51% year-to-date and 75% over the past 12 months, indicating investor concerns about the company's future prospects.
See More
Seres Therapeutics Stock Declines Amid Strategic Shift
- Strategic Shift: Seres Therapeutics announced a pivot towards emerging programs in inflammatory and immune diseases, resulting in a 16.25% drop in stock price during Thursday's premarket session, raising investor concerns about its current pipeline and funding strategies.
- Clinical Trial Update: The company has finalized the protocol for its Phase 2 study of SER-155 and is pausing further investment in this program, with results from the investigator-sponsored study expected in early Q2 2026, indicating a focus on early-stage programs.
- Workforce Reduction: Seres announced a 30% workforce reduction aimed at extending its cash runway through Q3 2026, allowing it to concentrate on advancing early-stage live biotherapeutic programs and pursue potential collaborations, highlighting financial constraints.
- Technical Trend Analysis: Currently trading at $11.80, Seres stock is 24.4% below its 20-day simple moving average, indicating a bearish trend and ongoing operational challenges, as the stock has decreased by 13.86% over the past 12 months.
See More
Seres (MCRB) Third Quarter 2025 Earnings Call Summary
- Author's Perspective: The views and opinions presented are solely those of the author.
- No Official Endorsement: The content does not necessarily reflect the views of Nasdaq, Inc.
See More
Seres Receives Positive Input from FDA on Phase 2 Study Protocol for SER-155; Plans Workforce Reduction
FDA Feedback on SER-155: Seres Therapeutics received constructive feedback from the FDA regarding the Phase 2 study protocol for SER-155, aimed at preventing bloodstream infections in adults undergoing stem cell transplants, which will aid in finalizing the protocol.
Workforce Reduction and Financial Outlook: The company is reducing its workforce by approximately 25%, which is expected to incur cash payments of $1.0 - $1.4 million in Q4 2025, while extending its cash runway into the second quarter of 2026.
See More
Seres Therapeutics reduces workforce by 25% to prolong cash reserves until Q2 2026.
Cost-Cutting Measures: Seres Therapeutics plans to reduce its workforce by about 25% to trim operating costs, which is expected to extend its cash runway into the second quarter of 2026.
SER-155 Study Development: Following positive FDA feedback, the company aims to finalize the Phase 2 study protocol for SER-155, targeting bloodstream infections in adults undergoing stem cell transplants, while seeking capital to support this and other biotherapeutic developments.
See More
Seres Therapeutics Pauses SER-155 Investment Amid Funding Challenges
- Investment Pause: Seres Therapeutics announced a pause on additional investments for its mid-stage trial, resulting in a ~25% drop in premarket trading, indicating significant funding challenges for its lead asset SER-155.
- Focus on Early Programs: The company will shift its focus to earlier-stage programs, including a fully enrolled study for SER-155 in immune checkpoint-related enterocolitis, expected to generate data by early Q2 2026, highlighting potential market demand for cancer therapies.
- Layoff Plans: Seres plans to lay off nearly 30% of its workforce to extend its cash runway through Q3 2026, a move aimed at streamlining operations and reducing costs to support the development of its early-stage pipeline.
- Regulatory Preparedness: CEO Marella Thorell stated that the company has taken extensive steps to prepare for a robust SER-155 Phase 2 study, including submitting a final protocol to the FDA, demonstrating commitment and confidence in future research.
See More
Seres Pauses SER-155 Phase 2 Study Amid Cost-Cutting Measures
- Study Pause Reason: Seres announced the pause of the SER-155 Phase 2 study following the completion of site evaluation and qualification with its contract research organization, despite the drug substance already being manufactured, which could hinder future R&D progress.
- Strategic Shift: The company will refocus its operations on high-value early-stage pipeline programs, particularly those targeting inflammatory bowel disease (IBD), aiming to seek greater market opportunities amid limited resources.
- Cash Runway Extension: Through cost-cutting measures, including a 30% workforce reduction, Seres expects to extend its cash runway into Q3 2026, which will support the continued development of immune-related disease programs while seeking additional funding for the SER-155 Phase 2 study.
- Market Reaction: While retail sentiment on Stocktwits remains in the 'bullish' territory, MCRB stock has fallen 51% year-to-date and 75% over the past 12 months, indicating investor concerns about the company's future prospects.
See More
Seres Therapeutics Stock Declines Amid Strategic Shift
- Strategic Shift: Seres Therapeutics announced a pivot towards emerging programs in inflammatory and immune diseases, resulting in a 16.25% drop in stock price during Thursday's premarket session, raising investor concerns about its current pipeline and funding strategies.
- Clinical Trial Update: The company has finalized the protocol for its Phase 2 study of SER-155 and is pausing further investment in this program, with results from the investigator-sponsored study expected in early Q2 2026, indicating a focus on early-stage programs.
- Workforce Reduction: Seres announced a 30% workforce reduction aimed at extending its cash runway through Q3 2026, allowing it to concentrate on advancing early-stage live biotherapeutic programs and pursue potential collaborations, highlighting financial constraints.
- Technical Trend Analysis: Currently trading at $11.80, Seres stock is 24.4% below its 20-day simple moving average, indicating a bearish trend and ongoing operational challenges, as the stock has decreased by 13.86% over the past 12 months.
See More
Seres (MCRB) Third Quarter 2025 Earnings Call Summary
- Author's Perspective: The views and opinions presented are solely those of the author.
- No Official Endorsement: The content does not necessarily reflect the views of Nasdaq, Inc.
See More
Seres Receives Positive Input from FDA on Phase 2 Study Protocol for SER-155; Plans Workforce Reduction
FDA Feedback on SER-155: Seres Therapeutics received constructive feedback from the FDA regarding the Phase 2 study protocol for SER-155, aimed at preventing bloodstream infections in adults undergoing stem cell transplants, which will aid in finalizing the protocol.
Workforce Reduction and Financial Outlook: The company is reducing its workforce by approximately 25%, which is expected to incur cash payments of $1.0 - $1.4 million in Q4 2025, while extending its cash runway into the second quarter of 2026.
See More
Seres Therapeutics reduces workforce by 25% to prolong cash reserves until Q2 2026.
Cost-Cutting Measures: Seres Therapeutics plans to reduce its workforce by about 25% to trim operating costs, which is expected to extend its cash runway into the second quarter of 2026.
SER-155 Study Development: Following positive FDA feedback, the company aims to finalize the Phase 2 study protocol for SER-155, targeting bloodstream infections in adults undergoing stem cell transplants, while seeking capital to support this and other biotherapeutic developments.
See More
