Avoid the stress of overpaying for a stock or missing an opportunity by using the right tools and insights to evaluate BillionToOne, Inc. before investing.

In this article, we go over a few key elements for understanding BillionToOne, Inc.’s stock price such as:

• BillionToOne, Inc.’s current stock price and volume
• Why BillionToOne, Inc.’s stock price changed recently
• Upgrades and downgrades for BLLN from analysts
• BLLN’s stock price momentum as measured by its relative strength

About BillionToOne, Inc. (BLLN)

Before we jump into BillionToOne, Inc.’s stock price, history, target price and what caused it to recently dip, let’s take a look at some background.

BillionToOne, Inc., a precision diagnostics company, quantifies biology to create molecular diagnostics. The company provides molecular counting platform, which is designed to detect and measure DNA molecules at the single-count level to help enhance disease detection. It also offers UNITY Complete, a non-invasive prenatal screen that assesses fetal risk for aneuploidies, recessive conditions, and fetal antigens from a maternal blood draw; Northstar Select, a liquid biopsy test that provides a list of mutations that are present in the tumor and types of mutations detected that include deletions, insertions, and point mutations; and Northstar Response, a methylation-based assay that quantifies the amount of cancer at the single molecule level without requiring a tissue biopsy, enabling real-time monitoring of patient response to therapy with unprecedented precision. BillionToOne, Inc. was incorporated in 2016 and is headquartered in Menlo Park, California.

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BillionToOne, Inc.’s Stock Price as of Market Close

As of July 31, 2026, 4:00 PM, CST, BillionToOne, Inc.’s stock price was $138.600.

BillionToOne, Inc. is down 0.71% from its previous closing price of $139.590.

During the last market session, BillionToOne, Inc.’s stock traded between $134.730 and $140.210. Currently, there are approximately 45.93 million shares outstanding for BillionToOne, Inc..

BillionToOne, Inc.’s price-earnings (P/E) ratio is currently at 178.0, which is high compared to the Health Care Providers & Services industry median of 26.8. The price-earnings ratio gauges market expectation of future performance by relating a stock’s current share price to its earnings per share.

BillionToOne, Inc. Stock Price History

BillionToOne, Inc.’s (BLLN) price is currently up 15.52% so far this month.

During the month of July, BillionToOne, Inc.’s stock price has reached a high of $140.210 and a low of $113.300.

Over the last year, BillionToOne, Inc. has hit prices as high as $140.000 and as low as $61.960. Year to date, BillionToOne, Inc.’s stock is up 69.35%.

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What Caused BillionToOne, Inc. Stock’s Price to Dip?

Stock prices are primarily based on seller supply and buyer demand. But have you ever wondered about what other factors affect a stock's price?

When an analyst changes their opinion of a stock by upgrading or downgrading their rating, it often leads to a sudden stock price adjustment. As of July 30, 2026, there were analysts who downgraded BillionToOne, Inc.’s stock and analysts who upgraded over the last month.

Additionally, you'll want to evaluate BillionToOne, Inc.’s financial health and valuation. Investors can use AAII's Value Grade, which combines six key valuation metrics like P/E and P/S ratios for a comprehensive analysis to conduct analysis on BillionToOne, Inc.’s valuation and financial health. This approach mitigates the limitations of single-metric evaluations.

BillionToOne, Inc.’s current valuation based on AAII’s Value Grade is a F, which means it is considered to be Ultra Expensive.

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Lastly, news and media coverage as well as recent press reports about the company or its industry may cause stock prices to fluctuate. You can check out the most recent news articles about BillionToOne, Inc. (BLLN) by visiting AAII Stock Evaluator.

Relative Price Strength of BillionToOne, Inc.

Relative price strength measures a stock's performance against the market, helping investors identify stocks that are outperforming benchmarks.

For AAII’s Momentum Grade, a weighted relative price strength is calculated. Follow this link to learn more about the Momentum Grade.

As of July 30, 2026, BillionToOne, Inc. has a weighted four-quarter relative price strength of %, which translates to a Momentum Score of and is considered to be NA.

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BillionToOne, Inc. Stock Price: Bottom Line

As of July 31, 2026, BillionToOne, Inc.’s stock price is $138.600, which is down 0.71% from its previous closing price.

AAII advises against making stock decisions based solely on price or past returns. Instead, consider a variety of metrics, fundamentals, and analytics to evaluate a stock like BillionToOne, Inc. stock prices are influenced by market supply and demand and offer just a snapshot of a company's overall health.

Subscribing to AAII's A+ Investor provides access to comprehensive analytics and insights for confident investing.