Rallybio (RLYB) Stock Price, News & Analysis

Company Overview

Rallybio Corporation, a clinical-stage biotechnology company, engages in development and commercialization of life-transforming therapies for patients suffering from severe and rare diseases. Its lead product candidate is RLYB212, a monoclonal anti-HPA-1a antibody that has completed Phase I clinical trial for the prevention of fetal and neonatal alloimmune thrombocytopenia (FNAIT); and RLYB211 for the prevention of FNAIT. The company is also developing RLYB114, a pegylated complement factor 5 (C5)-targeted Affibody molecule in preclinical development for the treatment of complement-mediated ophthalmic diseases; RLYB116, an inhibitor of complement component 5 (C5) to treat several diseases of complement dysregulation which has completed phase 1 trial; and RLYB331, a preclinical antibody, for the treatment of severe anemia with ineffective erythropoiesis and iron overload. It entered into a strategic alliance with AbCellera to discover, develop, and commercialize novel antibody-based therapeutics for rare diseases. Rallybio has collaboration with Exscientia for the development of small molecule therapeutics for rare diseases; and collaboration agreement with Johnson & Johnson to provide pregnant individuals therapeutic solutions at risk of fetal and neonatal alloimmune thrombocytopenia. The company was founded in 2018 and is headquartered in New Haven, Connecticut.

Key Stats

• Today's Range: $0.40 to $0.51
• 50-Day Range: $0.31 to $0.55
• 52-Week Range: $0.22 to $1.25
• Volume: 595,264 shs
• Average Volume: 604,964 shs
• Market Capitalization: $21.05 million
• P/E Ratio: N/A
• Dividend Yield: N/A
• Price Target: $10.00
• Consensus Rating: Hold

Rallybio Stock Analysis - MarketRank™

Rallybio scored higher than 48% of companies evaluated by MarketBeat, and ranked 605th out of 935 stocks in the medical sector. Scores are calculated by averaging available category scores, with extra weight given to analysis and valuation.

Analyst's Opinion

• Score: 3.0 / 5
• Analyst Rating: Hold

Consensus Rating

Rallybio has received a consensus rating of Hold. The company's average rating score is 2.00, and is based on no buy ratings, 4 hold ratings, and no sell ratings.

Amount of Analyst Coverage

Rallybio has received no research coverage in the past 90 days.

Earnings and Valuation

• Score: 1.3 / 5
• Proj. Earnings Growth: Growing

Earnings Growth

Earnings for Rallybio are expected to grow in the coming year, from ($1.34) to ($1.09) per share.

Price to Earnings Ratio vs. the Market

The P/E ratio of Rallybio is -0.54, 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 -0.54, 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 0.46. P/B Ratios below 1 indicate that a company could be undervalued with respect to its assets and liabilities.

Short Interest

• Score: 2.0 / 5
• Short Interest Level: Bearish

Percentage of Shares Shorted

9.67% 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 0.7, which is generally considered an acceptable ratio of short interest to trading volume.

Change versus previous month

Short interest in Rallybio has recently increased by 471.59%, indicating that investor sentiment is decreasing significantly.

Dividend

• Score: 0.0 / 5
• Dividend Strength: N/A

Dividend Yield

Rallybio does not currently pay a dividend.

Dividend Growth

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

Sustainability and ESG

• Score: N/A
• Environmental Score: N/A

Percentage of Shares Shorted

9.67% 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 0.7, which is generally considered an acceptable ratio of short interest to trading volume.

Change versus previous month

Short interest in Rallybio has recently increased by 471.59%, indicating that investor sentiment is decreasing significantly.

News and Social Media

• Score: 2.7 / 5
• News Sentiment: 0.84

News Sentiment

Rallybio has a news sentiment score of 0.84. 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 news sentiment score is similar to the average news sentiment of Medical companies.

News Coverage This Week

MarketBeat has tracked 5 news articles for Rallybio this week, compared to 1 article on an average week.

Search Interest

3 people have searched for RLYB on MarketBeat in the last 30 days.

Company Ownership

• Score: 1.7 / 5
• Insider Trading: N/A

Insider Buying vs. Insider Selling

In the past three months, Rallybio insiders have not sold or bought any company stock.

Percentage Held by Insiders

Only 8.70% of the stock of Rallybio is held by insiders.

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.

RLYB Stock Analysis - Frequently Asked Questions

How have RLYB shares performed this year?

Rallybio's stock was trading at $0.96 at the beginning of 2025. Since then, RLYB stock has decreased by 47.5% and is now trading at $0.5037.

How were Rallybio's earnings last quarter?

Rallybio Corporation (NASDAQ:RLYB) released its quarterly earnings data on Thursday, August, 7th. The company reported ($0.22) EPS for the quarter, topping analysts' consensus estimates of ($0.25) by $0.03. The firm had revenue of $0.21 million for the quarter. Rallybio had a negative trailing twelve-month return on equity of 71.66% and a negative net margin of 5,473.33%.

When did Rallybio IPO?

Rallybio (RLYB) raised $80 million in an initial public offering on Thursday, July 29th 2021. The company issued 5,750,000 shares at a price of $13.00-$15.00 per share.

Who are Rallybio's major shareholders?

Top institutional investors of Rallybio include Aberdeen Group plc (3.83%) and Canaan Partners XI LLC (2.26%).
View institutional ownership trends.

How do I buy shares of Rallybio?

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.

What other stocks do shareholders of Rallybio own?

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: 8/07/2025
• Today: 8/12/2025
• Fiscal Year End: 12/31/2025

Industry, Sector and Symbol

• Stock Exchange: NASDAQ
• Sector: Medical
• Industry: MED - BIOMED/GENE
• Sub-Industry: Pharmaceutical Products
• Current Symbol: NASDAQ:RLYB
• CIK: 1739410
• Web: www.rallybio.com
• Phone: 203-59-3820
• Fax: N/A
• Employees: 40
• Year Founded: N/A

Price Target and Rating

• Average Price Target for Rallybio: $10.00
• High Price Target: $15.00
• Low Price Target: $5.00
• Potential Upside/Downside: +1,885.3%
• Consensus Rating: Hold
• Rating Score (0-4): 2.00
• Research Coverage: 4 Analysts

Profitability

• EPS (Trailing Twelve Months): ($0.94)
• Trailing P/E Ratio: N/A
• Forward P/E Ratio: N/A
• P/E Growth: N/A
• Net Income: -$57.78 million
• Net Margins: -5,473.33%
• Pretax Margin: -5,218.27%
• Return on Equity: -71.66%
• Return on Assets: -65.06%

Debt

• Debt-to-Equity Ratio: N/A
• Current Ratio: 9.98
• Quick Ratio: 14.68

Sales & Book Value

• Annual Sales: $640 thousand
• Price / Sales: 32.89
• Cash Flow: N/A
• Price / Cash Flow: N/A
• Book Value: $1.10 per share
• Price / Book: 0.46

Miscellaneous

• Outstanding Shares: 41,790,000
• Free Float: 38,151,000
• Market Cap: $21.05 million
• Optionable: Not Optionable
• Beta: -1.12