Sionna Therapeutics

SION

Biotechnology · Healthcare

Price

$49.41

+4.12 (+9.10%)

Market Cap

$2.23B

Exchange

NASDAQ

Winston Score

–

No score yet — Winston is napping.

We couldn’t gather enough financial data to score this stock reliably.

Share count falling — buybacks

−9.4% over 3y

The company has reduced its share count over this period, returning value to shareholders through buybacks.

Diluted shares outstanding: 44.1M (2022) → 40.0M (2025)

Sionna Therapeutics, Inc. is a biopharmaceutical company. The Company provides treatment paradigm for cystic fibrosis patients by developing medicines that normalize the function of the cystic fibrosis transmembrane conductance regulator.

Winston Score History

Growth Profile

For growth stock investors

When traditional metrics don't capture the full picture, these are the signals growth stock investors use instead.

Revenue Growth

Revenue data limited

EPS Growth

-60.5% YoY

YoY Growth Rate

Earnings declining

R&D Spend

$60M/ year

↑ Rising (+5% vs prior year)

R&D investment increasing — building for the future

Insider Activity

41.5%ownership

→ Flat

Insiders holding steady — not selling despite ability to

Cash Runway

~3 years

$290M cash & investments

Quarterly Free Cash Flow

↓ Burn rate worsening

$290M cash & investments at current burn rate

The Winston Score above measures business quality today. Growth stocks often score lower because they invest in the future rather than maximising current profits. These metrics show what matters most for evaluating that future.

Score breakdown

Every number that matters to educated investors.

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Quality

Gross Margin

N/A

—

Data not available

Operating Margin

N/A

—

Data not available

ROCE

-10.0%

Weak — -10.0% return on capital

Negative ROIC means the business is losing money on every dollar invested in it.

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Growth

Sales YoY

N/A

—

Data not available

EPS YoY

N/A

—

Data not available

EPS Consistency

0/8 quarters

Earnings rarely grow — volatile business

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Cash Flow

Cash Conversion

N/A

—

Data not available

FCF Margin

N/A

—

Data not available

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Stability

Debt / Equity

0.02

Conservative — low debt load (0.02)

Interest Cover

N/A

—

Data not available

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Valuation

P/E Ratio (TTM)

N/M

—

Negative earnings — P/E not meaningful

P/E vs Forward

N/A

not available

Data not available

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Dividends

Not applicable for this business.

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