NASDAQ · MCRBHealthcarePharmaceuticals

Seres Therapeutics, Inc. (MCRB)

$2.09+6.63%
Close Nov 4, 2026 · split-adjusted
Oct 30, 2026$1.77▼ 88.39% in range
Nov 3, 2025Low $1.77 · High $28.63Oct 30, 2026
What changed · written from our data
As of Nov 4, 2026

Seres Therapeutics closed at $2.09 on Nov 4, up 6.63%, 92.7% below its 52-week closing high. Volume of 95.0K shares was 1.27× its 20-day average (above normal).

Split-adjusted performance: -27.9% over one month, -73.9% over six months, -86.3% over one year.

In the quarter ended Jun 30, 2026, revenue was $736K, with a net margin of 622.4%.

Short interest was 312.3K shares at the Oct 15 settlement (4.4% of float, 3.5 days to cover).

Market cap$21.0M10.0M shares
Revenue · quarter$736.0K—
Diluted EPS$0.47—
P/E · TTM—P/S 11.1×
Net margin622.4%Gross 100.0%
Dividend yieldNone
52-week range1.77 – 28.63−92.7% from high
Volume95.0K1.27× 20-day avg
Volatility · 60d73.3%Annualised
Short % of float4.4%3.5 days to cover
Net cash$15.6MCash $15.6M
Next earnings—Not scheduled
Split-adjusted performance
1W +16.8%1M −27.9%3M −56.6%6M −73.9%YTD −86.0%1Y −86.3%3Y −92.8%5Y −98.3%

Earnings reactions

History →

No reported quarters with price history yet.

Rank within Pharmaceuticals

Percentile among 420 companies (100 = best)

6-month momentum10
Revenue growth—
Net margin99
Value (low P/E)—
Size22

Industry medians: 6-month return −25.5%, revenue growth +6.2%, net margin −33.8%, P/E 16.1×.

Short interest

Details →
Shares short312.3K−0.6% vs prior
Days to cover3.5Settled Oct 15
% of float4.4%
Short vol. 10d50.1%of daily volume

Closest peers by size in Pharmaceuticals

CompanyPriceToday6MRev. growthNet marginP/EMkt cap
MCRBSeres Therapeutics$2.09+6.63%−73.9%—622.4%—$21.0M
TXMDTherapeuticsMD$1.82+2.25%−10.3%−8.7%17.8%—$21.1MCompare
EDSAEdesa Biotech$2.17−4.82%−85.5%———$20.9MCompare
AYTUAYTU BioPharma$1.92−0.52%−25.0%+6.4%−0.1%—$20.9MCompare
ATOSAtossa Therapeutics$2.12−9.01%−63.4%———$21.2MCompare
IGCIGC Pharma$0.1950+4.84%−38.7%−19.2%−1107.9%—$20.2MCompare
COCPCocrystal Pharma$1.01−5.61%−28.4%—−3013.3%—$19.5MCompare
CNTXContext Therapeutics$0.2035+4.90%−91.6%———$18.7MCompare
MIRAMIRA Pharmaceuticals$0.5610+8.34%−43.9%———$23.6MCompare

Quick answers

What does Seres Therapeutics do?
Seres Therapeutics Inc is a clinical-stage biotechnology company focused on the development of live biotherapeutic candidates. Its pipeline includes candidates such as SER-155 and SER-603, aimed at preventing and treating bacterial infections, antimicrobial resistance, and gastrointestinal immune diseases.
What is MCRB's market cap?
$20.99M, based on the Nov 4 close of $2.09.
Does Seres Therapeutics pay a dividend?
No regular cash dividend has been paid in the last year.
How much of MCRB is sold short?
312.3K shares, 4.4% of float, as of Oct 15, 2026.
What sector is MCRB in?
Healthcare, in the Pharmaceuticals industry.

About Seres Therapeutics

Seres Therapeutics Inc is a clinical-stage biotechnology company focused on the development of live biotherapeutic candidates. Its pipeline includes candidates such as SER-155 and SER-603, aimed at preventing and treating bacterial infections, antimicrobial resistance, and gastrointestinal immune diseases. The company operates as a single reportable segment, mainly developing microbiome-based therapies targeting bacterial infections, antimicrobial resistance, and gastrointestinal immune diseases.

HQ: Cambridge, MA66 employeesListed Jun 26, 2015serestherapeutics.com

Sources: Massive / Polygon daily aggregates (split-adjusted) · SEC filings via Massive · FINRA settlements via Massive · Financial Modeling Prep. Figures are dated where shown; research is informational, not investment advice. Methodology