NASDAQ · BLLNHealthcareMedical Labs

BillionToOne, Inc. Class A Common Stock (BLLN)

$113.89+3.11%
Close Nov 4, 2026 · split-adjusted
Nov 4, 2026$113.89▲ 4.54% in range
Nov 6, 2025Low $64.03 · High $149.97Nov 4, 2026
What changed · written from our data
As of Nov 4, 2026

BillionToOne closed at $113.89 on Nov 4, up 3.11%, 24.1% below its 52-week closing high. Volume of 582.8K shares was 1.24× its 20-day average (close to normal).

Split-adjusted performance: +14.0% over one month, +39.9% over six months.

In the quarter ended Jun 30, 2026, revenue was $109.45M, with a net margin of 7.4%.

Short interest was 2.9M shares at the Oct 15 settlement, up 4.0% from the prior report (12.0% of float, 5.5 days to cover).

Market cap$5.37B47.2M shares
Revenue · quarter$109.4M—
Diluted EPS$0.15—
P/E · TTM—
Net margin7.4%Gross 70.5%
Dividend yieldNone
52-week range64.03 – 149.97−24.1% from high
Volume582.8K1.24× 20-day avg
Volatility · 60d58.7%Annualised
Short % of float12.0%5.5 days to cover
Net cash$457.0MCash $548.6M
Next earnings—Not scheduled
Split-adjusted performance
1W −0.1%1M +14.0%3M +24.3%6M +39.9%YTD +39.2%1Y —3Y —5Y —

Earnings reactions

History →

No reported quarters with price history yet.

Rank within Medical Labs

Percentile among 24 companies (100 = best)

6-month momentum55
Revenue growth—
Net margin81
Value (low P/E)—
Size70

Industry medians: 6-month return +36.9%, revenue growth +25.0%, net margin −4.0%, P/E 32.4×.

Short interest

Details →
Shares short2.9M+4.0% vs prior
Days to cover5.5Settled Oct 15
% of float12.0%
Short vol. 10d59.7%of daily volume

Closest peers by size in Medical Labs

CompanyPriceToday6MRev. growthNet marginP/EMkt cap
BLLNBillionToOne$113.89+3.11%+39.9%—7.4%—$5.37B
RDNTRadNet$80.26+9.67%+36.9%+25.0%1.2%—$6.32BCompare
CDNACareDx$85.86−2.95%+309.8%+39.3%13.8%35.1$4.51BCompare
GRALGRAIL$143.66+3.03%+128.9%+25.7%−246.7%—$6.42BCompare
VCYTVeracyte$52.52+4.43%+27.5%+15.5%17.0%36.9$4.22BCompare
CELCCelcuity$69.24−0.69%−50.3%———$3.39BCompare
CAICaris Life Sciences$33.22+1.13%+73.7%+45.4%−0.2%89.3$9.39BCompare
FTREFortrea Holdings$20.83−0.57%+33.2%−1.4%0.1%—$2.01BCompare
PSNLPersonalis$15.79+0.25%+160.1%+30.0%−141.7%—$1.69BCompare

Quick answers

What does BillionToOne do?
BillionToOne Inc is a molecular diagnostics company. It offers a portfolio of ultrasensitive tests covering prenatal genetic testing, cancer therapy selection, and response monitoring, which are based on its Quantitative Counting Templates (QCT) molecular counting platform.
What is BLLN's market cap?
$5.37B, based on the Nov 4 close of $113.89.
Does BillionToOne pay a dividend?
No regular cash dividend has been paid in the last year.
How much of BLLN is sold short?
2.9M shares, 12.0% of float, as of Oct 15, 2026.
What sector is BLLN in?
Healthcare, in the Medical Labs industry.

About BillionToOne

BillionToOne Inc is a molecular diagnostics company. It offers a portfolio of ultrasensitive tests covering prenatal genetic testing, cancer therapy selection, and response monitoring, which are based on its Quantitative Counting Templates (QCT) molecular counting platform. The company's product portfolio comprises UNITY, a portfolio of prenatal testing products that can conduct fetal risk analysis without requiring a paternal sample; Northstar Select, a ultrasensitive liquid biopsy test that provides insights into appropriate therapies for stage III or IV cancer patients; and Northstar Response, a tissue-free, pan-cancer, liquid biopsy test that measures several genomic loci uniquely methylated in cancer to provide insight into dynamic changes in therapy response.

HQ: Menlo Park, CA713 employeesListed Nov 6, 2025billiontoone.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