Lyell Immunopharma (LYEL) vs Sionna Therapeutics (SION)
Head-to-head comparison of performance, valuation, growth, profitability and dividends. Prices delayed 15 minutes; data as of Oct 9, 2026.
Summary
Lyell Immunopharma (LYEL) has outperformed Sionna Therapeutics (SION) over the past year, losing 51.9% versus a loss of 82.8%. Sionna Therapeutics is the larger company by market cap ($221.2 million vs $215.4 million), about 1.0 times the size.
Summary generated from market data by MetaCap's automated system. Methodology
Relative performance
Percent change in share price from the first common trading day shown; excludes dividends.
Head-to-head
| Metric | LYEL | SION |
|---|---|---|
| Share price | $8.79 | $4.90 |
| Market cap | $215.40M | $221.24M |
| 1-day change | +2.69% | +1.66% |
| YTD return | -71.44% | -88.09% |
| 1-year return | -51.86% | -82.81% |
| 5-year return | -96.69% | — |
| EPS (TTM) | $-12.86 | $-2.20 |
| Dividend yield | 0.00% | 0.00% |
| Annual dividend | $0.00 | $0.00 |
| 52-week high | $45.00 | $54.97 |
| 52-week low | $8.21 | $4.01 |
| Distance from 52-week high | -80.47% | -91.09% |
| Analyst consensus | buy | hold |
| Avg. price target upside | +330.94% | +328.57% |
| Average volume | 145.70K | 2.19M |
| Shares outstanding | 24.51M | 45.15M |
| Employees | 161 | 59 |
| Sector | Health Care | Health Care |
| Industry | Biotechnology: Pharmaceutical Preparations | Biotechnology: Pharmaceutical Preparations |
Highlighted cells mark the higher value for growth, returns, margins and yield, and the lower value for P/E ratios. Highlighting is a mechanical comparison, not a recommendation.
Key differences
- LYEL has outperformed SION by 30.9 percentage points over the past year.
About Lyell Immunopharma
LYEL stock →Lyell Immunopharma, Inc., a clinical-stage cell therapy company, develops chimeric antigen receptor (CAR) T-cell product candidates for patients with hematologic malignancies and solid tumors. The company's lead product candidate include rondecabtagene autoleucel, an autologous dual-targeting CD19/CD20 CAR T-cell therapy in development, which is in pivotal PiNACLE trial in the 3L+ setting and in a Phase 1/2 clinical trial in the 2L setting, as well as a second pivotal trial, PiNACLE-H2H, which is a Phase 3 head-to-head CAR T cell therapy randomized controlled trial of ronde-cel for LBCL in the 2L setting for the treatment of large B-cell lymphoma; and LYL273, a GCC-targeted CAR T-cell product candidate enhanced with CD19 CAR expression and controlled cytokine release designed to improve CAR T-cell expansion, immune cell infiltration, and cancer cell killing in the hostile solid tumor microenvironment, which is in Phase 1 clinical trial for the treatment of refractory metastatic colorectal cancer.
Health Care · Biotechnology: Pharmaceutical Preparations · 161 employees
About Sionna Therapeutics
SION stock →Sionna Therapeutics, Inc., a clinical-stage biopharmaceutical company, researches and develops medicines for the treatment of cystic fibrosis (CF). It develops galicaftor (SION-2222), a transmembrane domain 1 (TMD1)-directed cystic fibrosis transmembrane conductance regulator (CFTR) that has completed Phase 2 trial; navocaftor (SION-3067), a potentiator that has completed Phase 2 trial; SION-109, an intracellular loop 4 directed CFTR corrector that has completed Phase 1 trial; SION-2851, a TMD1-directed CFTR corrector that has completed Phase 1 trial; SION-451, which is nucleotide-binding domain 1 stabilizer in Phase 1 trial; and SION-719, which is nucleotide-binding domain 1 stabilizer in Phase 2a proof-of-concept trial.
Health Care · Biotechnology: Pharmaceutical Preparations · 59 employees
LYEL vs SION FAQ
Which is bigger, Lyell Immunopharma or Sionna Therapeutics?
Sionna Therapeutics (SION) is larger, with a market capitalization of $221.24M compared with $215.40M for Lyell Immunopharma (LYEL).
Which stock has performed better over the past year, LYEL or SION?
LYEL returned -51.86% over the past 12 months, compared with -82.81% for SION (price return, excluding dividends). Past performance does not predict future results.
Are Lyell Immunopharma and Sionna Therapeutics in the same industry?
Yes. Both are classified in the Biotechnology: Pharmaceutical Preparations industry within the Health Care sector.