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NASDAQ:RLYB

Rallybio (RLYB) Stock Price, News & Analysis

Rallybio logo
$15.93 -0.14 (-0.87%)
Closing price 07/31/2026 04:00 PM Eastern
Extended Trading
$15.94 +0.02 (+0.09%)
As of 07/31/2026 04:10 PM Eastern
Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Massive. Learn more.

About Rallybio Stock (NASDAQ:RLYB)

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Key Stats

Today's Range
$15.86
$16.06
50-Day Range
$14.46
$16.91
52-Week Range
$3.20
$17.57
Volume
18,104 shs
Average Volume
40,627 shs
Market Capitalization
$84.43 million
P/E Ratio
N/A
Dividend Yield
N/A
Price Target
N/A
Consensus Rating
Sell

Company Overview

Rallybio Therapeutics, Inc. (NASDAQ: RLYB) is a clinical‐stage biotechnology company focused on developing and commercializing therapies for people living with rare genetic diseases. The company’s scientific approach leverages diverse modalities—including monoclonal antibodies, small molecules and enzyme replacement—to address high‐unmet‐need conditions in areas such as immunodeficiency, metabolic disorders and dermatologic diseases. Rallybio’s pipeline is designed to advance through registrational clinical trials with the goal of delivering first‐in‐class or best‐in‐class therapies to patients who currently have limited or no approved treatment options.

Among Rallybio’s lead programs is RBX‐100, an investigational therapy for congenital athymia, a rare pediatric immunodeficiency. Additional pipeline candidates target lysosomal storage disorders and severe skin fragility syndromes, underscoring the company’s commitment to a precision‐medicine approach. Each program has been selected based on compelling preclinical or early clinical data that suggest a clear path to regulatory milestones and commercialization.

Founded in 2018 and headquartered in New York City, Rallybio completed its initial public offering via a business combination in 2021. The company leverages strategic partnerships, external research collaborations and internal manufacturing capabilities to accelerate development timelines and maintain rigorous quality standards. While Rallybio’s primary operations are based in the United States, its clinical trial network spans North America, Europe and Asia Pacific, reflecting its objective to serve rare disease communities on a global scale.

Rallybio is led by a management team with extensive experience in rare disease research, drug development and regulatory strategy. The company aims to build on its scientific foundation by expanding its pipeline, advancing key assets toward commercialization and fostering collaborations that enhance access to therapies for underserved patient populations worldwide.

AI Generated. May Contain Errors.

Rallybio Stock Analysis - MarketRank™

See Top-Rated MarketRank™ Stocks
33rd Percentile Overall Score

RLYB MarketRank™: 

Rallybio scored higher than 33% of companies evaluated by MarketBeat, and ranked 737th out of 894 stocks in the healthcare sector. Scores are calculated by averaging available category scores, with extra weight given to analysis and valuation.

  • Consensus Rating

    Rallybio has received a consensus rating of Sell. The company's average rating score is 1.00, and is based on no strong buy ratings, no buy ratings, no hold ratings, and 1 sell rating.

  • Amount of Analyst Coverage

    Rallybio has only been the subject of 1 research reports in the past 90 days.

  • Read more about Rallybio's stock forecast and price target.
  • Price to Earnings Ratio vs. the Market

    The P/E ratio of Rallybio is -3.67, which means that its earnings are negative and its P/E ratio cannot be compared to companies with positive earnings.

  • Price to Earnings Ratio vs. Sector

    The P/E ratio of Rallybio is -3.67, which means that its earnings are negative and its P/E ratio cannot be compared to companies with positive earnings.

  • Price to Book Value per Share Ratio

    Rallybio has a P/B Ratio of 1.45. P/B Ratios below 3 indicates that a company is reasonably valued with respect to its assets and liabilities.

  • Read more about Rallybio's valuation and earnings.
  • Percentage of Shares Shorted

    3.58% of the float of Rallybio has been sold short.
  • Short Interest Ratio / Days to Cover

    Rallybio has a short interest ratio ("days to cover") of 3.54, which is generally considered an acceptable ratio of short interest to trading volume.
  • Change versus previous month

    Short interest in Rallybio has recently decreased by 58.37%, indicating that investor sentiment is improving significantly.
  • Dividend Yield

    Rallybio does not currently pay a dividend.

  • Dividend Growth

    Rallybio does not have a long track record of dividend growth.

  • News Sentiment

    Rallybio has a news sentiment score of 0.95. This score is calculated as an average of sentiment of articles about the company over the last seven days and ranges from 2 (good news) to -2 (bad news). This is a higher news sentiment than the 0.73 average news sentiment score of Healthcare companies.
  • News Coverage This Week

    MarketBeat has tracked 2 news articles for Rallybio this week, compared to 1 article on an average week.
  • MarketBeat Follows

    3 people have added Rallybio to their MarketBeat watchlist in the last 30 days. This is an increase of 50% compared to the previous 30 days.
  • Net Insider Buying

    Over the last three months, insiders have purchased a net $4,229,715.00 in company stock, which represents 5.0098% of the company's market cap.

  • Insider Buying vs. Insider Selling

    In the past three months, Rallybio insiders have bought more of their company's stock than they have sold. Specifically, they have bought $4,229,715.00 in company stock and sold $0.00 in company stock.

  • Percentage Held by Insiders

    10.30% of the stock of Rallybio is held by insiders. A high percentage of insider ownership can be a sign of company health.

  • Percentage Held by Institutions

    90.34% of the stock of Rallybio is held by institutions. High institutional ownership can be a signal of strong market trust in this company.

  • Read more about Rallybio's insider trading history.
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RLYB Stock News Headlines

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Rallybio Corporation
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RLYB Stock Analysis - Frequently Asked Questions

Rallybio's stock was trading at $5.4888 at the beginning of the year. Since then, RLYB shares have increased by 190.2% and is now trading at $15.93.

Rallybio Corporation (NASDAQ:RLYB) announced its quarterly earnings data on Wednesday, May, 13th. The company reported ($1.46) EPS for the quarter, missing analysts' consensus estimates of ($1.20) by $0.26. The company had revenue of $0.21 million for the quarter, compared to analyst estimates of $0.21 million. Rallybio had a negative net margin of 911.07% and a negative trailing twelve-month return on equity of 55.79%.

Shares of Rallybio reverse split on Friday, February 6th 2026.The 1-8 reverse split was announced on Tuesday, February 3rd 2026. The number of shares owned by shareholders was adjusted after the closing bell on Thursday, February 5th 2026. An investor that had 100 shares of stock prior to the reverse split would have 13 shares after the split.

Rallybio (RLYB) raised $87 million in an initial public offering on Wednesday, July 28th 2021. The company issued 6,200,000 shares at $13.00-$15.00 per share.

Shares of RLYB stock can be purchased through any online brokerage account. Popular online brokerages with access to the U.S. stock market include Charles Schwab, E*TRADE, Fidelity, and Vanguard Brokerage Services.

Based on aggregate information from My MarketBeat watchlists, some other companies that Rallybio investors own include Meta Platforms (META), NVIDIA (NVDA), Advanced Micro Devices (AMD), Tesla (TSLA), JPMorgan Chase & Co. (JPM), Netflix (NFLX) and Plug Power (PLUG).

Company Calendar

Last Earnings
5/13/2026
Today
8/01/2026
Next Earnings (Estimated)
8/06/2026
Fiscal Year End
12/31/2026

Industry, Sector and Symbol

Stock Exchange
NASDAQ
Industry
Biotechnology
Sub-Industry
Biotechnology
Current Symbol
NASDAQ:RLYB
CIK
1739410
Fax
N/A
Employees
40
Year Founded
N/A

Profitability

EPS (Trailing Twelve Months)
($4.34)
Trailing P/E Ratio
N/A
Forward P/E Ratio
N/A
P/E Growth
N/A
Net Income
-$8.98 million
Net Margins
-911.07%
Pretax Margin
-877.62%
Return on Equity
-55.79%
Return on Assets
-51.48%

Debt

Debt-to-Equity Ratio
N/A
Current Ratio
12.92
Quick Ratio
12.92

Sales & Book Value

Annual Sales
$860 thousand
Price / Sales
98.17
Cash Flow
N/A
Price / Cash Flow
N/A
Book Value
$10.98 per share
Price / Book
1.45

Miscellaneous

Outstanding Shares
5,300,000
Free Float
4,752,000
Market Cap
$84.43 million
Optionable
Not Optionable
Beta
-0.90
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This page (NASDAQ:RLYB) was last updated on 8/2/2026 by MarketBeat.com Staff.
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