MetaCap

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

LYEL-51.86%SION-82.81%
+121%+14%-94%
Oct 8, 20251 yearOct 8, 2026
LYEL-23.43%SION-80.40%
+220%+63%-95%
Feb 3, 20255 yearsOct 5, 2026

Percent change in share price from the first common trading day shown; excludes dividends.

Head-to-head

LYEL versus SION key metrics
MetricLYELSION
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 yield0.00%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 consensusbuyhold
Avg. price target upside+330.94%+328.57%
Average volume145.70K2.19M
Shares outstanding24.51M45.15M
Employees16159
SectorHealth CareHealth Care
IndustryBiotechnology: Pharmaceutical PreparationsBiotechnology: 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.

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