Rallybio Corporation (RLYB) Fair Value & Analysis
Healthcare · US · Market cap $92.6M
Rallybio Corporation
RLYB · US
Fair value as of: Jul 24, 2026
From 1 valuation models · updated 18 days ago
Share price +3.1% over the past month.
A solid business, but screening 39% overvalued on our models.
What matters now
- The price sits above even our optimistic bull case ($12.27). The favourable scenario is already priced in.
- The large gap to fair value rests on thin data (low evidence): fewer applicable models and a shorter history. Read it with extra caution.
- Solid but not exceptional quality (52/100) and above fair value, neither a clear bargain nor a standout compounder.
- A fairly wide model range ($6.48 to $12.27) leaves room in how you read the outcome.
Price vs Fair Value (5 years)
White line = price, green steps = our fair value per fiscal year, dashed = 300-day average. As of Jul 24, 2026.
How to read this chart
60‑month range $2.00 – $187.20 · fair‑value band $6.48 – $12.27 · the $16.16 price screens above the $9.82 fair value. Dashed = 300-day average. As of Jul 24, 2026.
Analysis
Rallybio Corporation (RLYB) currently trades at $16.16, while our model-based Fair Value estimate is $9.82, implying the stock looks roughly 39.2% overvalued today. The Quality Score stands at 52/100 (solid quality), in the Healthcare sector. Bear case: priced above our estimate, the market already discounts strong expectations. Bull case: above-average quality can justify a premium, the entry price still matters most (evidence: low).
Trailing-twelve-month revenue stands at $858K. It earns a return on equity of -15.0%. The balance sheet holds a net cash position of $31.2M. Fundamentals as of Jul 24, 2026
Our scenario range runs from $6.48 (bear case) to $12.27 (bull case); at $16.16, the current price sits above that range. Bear and bull are the same models run on conservative and optimistic assumptions (margins, growth, valuation multiples), so a plausible valuation range, not a price target. The share trades about 8% below its 52-week high, currently above its 200-day average. For context, the median of 10 Healthcare peers we cover trades at -43% fair-value upside, at -39%, RLYB screens cheaper than that median.
Fair Value models
Each model estimates fair value its own way; the Fair Value above is the evidence-weighted blend. Evidence (0–100) measures how completely this model’s inputs are available: well-fed models carry more weight in the blend. The spread across models is intentional, each one stresses a different value driver; dividend models, for instance, come out structurally low when payout is small.
All 1 models by family
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Key figures & financial health
Figures from reported company fundamentals · as of Jul 24, 2026. TTM = trailing twelve months.
Quality Score breakdown
Of which business quality 55 · Market factors (momentum, volatility) 84
Non-valuation factor families (profitability, growth, cashflow, financial strength, momentum …), each academically grounded. Valuation itself sits in the Fair Value and is deliberately excluded here to avoid double-counting.
About the company
Rallybio Corporation, a clinical-stage biotechnology company, engages in the development and commercialization of life-transforming therapies for patients suffering from severe and rare diseases.
Full company description
Rallybio Corporation, a clinical-stage biotechnology company, engages in the development and commercialization of life-transforming therapies for patients suffering from severe and rare diseases. Its lead product candidate is the RLYB116, an inhibitor of complement component 5 (C5) to treat several diseases of complement dysregulation which has completed phase 1 trial; and RLYB332, a preclinical antibody, for the treatment of severe anemia with ineffective erythropoiesis and iron overload. The company has a strategic alliance with AbCellera to discover, develop, and commercialize novel antibody-based therapeutics for rare diseases, as well as collaboration agreement with Johnson & Johnson to provide therapeutic solutions for pregnant individuals at risk of fetal and neonatal alloimmune thrombocytopenia. Rallybio Corporation was founded in 2018 and is headquartered in New Haven, Connecticut.
Company description, as reported by the company or data provider.
Revenue & earnings trend
FY2021 – FY2025 · reported fiscal years
Rallybio Corporation reported revenue of $858K in FY2025 versus $0 in FY2021. Reported net income was −$9.0M in FY2025.
RLYB screens 39% overvalued. Compare with Vertex Pharmaceuticals Incorporated →
Peer Group
Biotechnology · 601 stocks
How this stock ranks against its industry: the green marker is this stock, the band is the typical 25–75% peer range, and the tick is the median.
Valuation Multiples vs Biotechnology median · lower = cheaper
Values & ESG
Does this company touch areas you may want to avoid? The classification is inferred from sector and industry.
ESG scores are not available for this stock yet. Values and ESG data are contextual and can differ between providers.
Similar stocks
10 more Biotechnology stocks, each showing price versus our Fair Value estimate (as of Jul 24, 2026).
| Stock | Price | Fair Value | vs Fair Value |
|---|---|---|---|
| Vertex Pharmaceuticals Incorporated VRTX | $486.03 | $278.78 | -43% |
| Regeneron Pharmaceuticals, Inc REGN | $664.45 | $594.40 | -11% |
| Samsung Biologics Co 207940 | 1,368,000 KRW | 1,091,384 KRW | -20% |
| Celltrion, Inc 068270 | 175,800 KRW | 76,325 KRW | -57% |
| WuXi Biologics (Cayman) Inc 2269 | HK$39.54 | HK$30.42 | -23% |
| Innovent Biologics, Inc 1801 | HK$86.70 | HK$19.66 | -77% |
| Sino Biopharmaceutical Limited 1177 | HK$5.26 | HK$3.36 | -36% |
| ALTEOGEN Inc 196170 | 276,500 KRW | 44,444 KRW | -84% |
| RemeGen Co 688331 | ¥134.02 | ¥26.99 | -80% |
| Biocon Limited BIOCON | ₹440.70 | ₹57.36 | -87% |
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How we calculate Fair Value
Each company is valued through a stack of independent intrinsic-value models (DCF variants, residual-income, multiples and more), blended into one family-balanced consensus and weighted by how much trustworthy data backs it. A separate quality layer scores the fundamentals. Every input is real reported data, nothing guessed.
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