NASDAQ · SIONHealthcarePharmaceuticals

Sionna Therapeutics, Inc. Common Stock (SION)

$3.73+2.19%
Close Nov 4, 2026 · split-adjusted
Nov 4, 2026$3.73▼ 89.53% in range
Nov 4, 2025Low $3.60 · High $51.04Nov 4, 2026
What changed · written from our data
As of Nov 4, 2026

Sionna Therapeutics closed at $3.73 on Nov 4, up 2.19%, 92.7% below its 52-week closing high. Volume of 687.4K shares was 0.71× its 20-day average (below normal).

Split-adjusted performance: -21.5% over one month, -91.4% over six months, -89.7% over one year.

Short interest was 3.7M shares at the Oct 15 settlement, down 3.2% from the prior report (19.3% of float, 3.7 days to cover).

Market cap$168.6M45.2M shares
Revenue · quarter$0.00—
Diluted EPS$-0.66—
P/E · TTM—
Net margin—
Dividend yieldNone
52-week range3.60 – 51.04−92.7% from high
Volume687.4K0.71× 20-day avg
Volatility · 60d100.1%Annualised
Short % of float19.3%3.7 days to cover
Net cash$211.0MCash $211.0M
Next earnings—Not scheduled
Split-adjusted performance
1W −7.7%1M −21.5%3M −92.5%6M −91.4%YTD −90.9%1Y −89.7%3Y —5Y —

Earnings reactions

History →

No reported quarters with price history yet.

Rank within Pharmaceuticals

Percentile among 420 companies (100 = best)

6-month momentum2
Revenue growth—
Net margin—
Value (low P/E)—
Size46

Industry medians: 6-month return −25.5%, revenue growth +6.2%, net margin −33.8%, P/E 16.1×.

Short interest

Details →
Shares short3.7M−3.2% vs prior
Days to cover3.7Settled Oct 15
% of float19.3%
Short vol. 10d43.8%of daily volume

Closest peers by size in Pharmaceuticals

CompanyPriceToday6MRev. growthNet marginP/EMkt cap
SIONSionna Therapeutics$3.73+2.19%−91.4%———$168.6M
PEPGPepGen$2.45−0.41%+32.8%———$169.7MCompare
INOInovio Pharmaceuticals$1.62−2.41%+30.6%———$167.5MCompare
ZNTLZentalis Pharmaceuticals$1.76−1.12%−57.9%———$166.6MCompare
ORMPOramed Pharmaceuticals$4.13+3.25%+5.4%——1.0$171.8MCompare
ANTXAN2 Therapeutics$4.25+1.67%−8.6%———$160.4MCompare
WHWKWhitehawk Therapeutics$3.17+2.26%−23.6%———$180.7MCompare
BBOTBridgeBio Oncology Therapeutics$2.30−0.86%−72.4%———$184.4MCompare
ALXOALX Oncology Holdings$1.36+5.43%−34.9%———$188.1MCompare

Quick answers

What does Sionna Therapeutics do?
Sionna Therapeutics Inc is a clinical-stage biopharmaceutical company on a mission to revolutionize the current treatment paradigm for cystic fibrosis (CF) patients by developing novel medicines that normalize the function of the cystic fibrosis transmembrane conductance regulator (CFTR) protein to deliver clinically meaningful benefits to CF patients. CF is a progressive and life-threatening genetic disease caused by inherited mutations in the CFTR gene, which heads to insufficient CFTR function.
What is SION's market cap?
$168.64M, based on the Nov 4 close of $3.73.
Does Sionna Therapeutics pay a dividend?
No regular cash dividend has been paid in the last year.
How much of SION is sold short?
3.7M shares, 19.3% of float, as of Oct 15, 2026.
What sector is SION in?
Healthcare, in the Pharmaceuticals industry.

About Sionna Therapeutics

Sionna Therapeutics Inc is a clinical-stage biopharmaceutical company on a mission to revolutionize the current treatment paradigm for cystic fibrosis (CF) patients by developing novel medicines that normalize the function of the cystic fibrosis transmembrane conductance regulator (CFTR) protein to deliver clinically meaningful benefits to CF patients. CF is a progressive and life-threatening genetic disease caused by inherited mutations in the CFTR gene, which heads to insufficient CFTR function. The Company is managed as one operating segment focused on the research and development of cystic fibrosis therapies.

HQ: Waltham, MA59 employeesListed Feb 7, 2025sionnatx.com

Sources: Massive / Polygon daily aggregates (split-adjusted) · SEC filings via Massive · FINRA settlements via Massive · Financial Modeling Prep. Figures are dated where shown; research is informational, not investment advice. Methodology