Korro Bio

KRRO

Biotechnology · Healthcare

Price

$12.25

-0.03 (-0.24%)

Market Cap

$121.9M

Exchange

NASDAQ

Winston Score

Winston is worried

Weak fundamentals across most pillars.

Based on the IPO prospectus (annual filing). This score will refine automatically once the company reports its first quarters.

Share count rising — dilution

+111.3% over 4y

The company has issued more shares over this period, which dilutes each existing shareholder’s stake.

Diluted shares outstanding: 4.4M (2021) → 9.4M (2025)

Korro Bio, Inc., a biopharmaceutical company, discovers, develops, and commercializes genetic medicines based on editing RNA for the treatment of rare and highly prevalent diseases. Korro Bio, Inc. is based in Cambridge, Massachusetts.

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

-100.0% YoY

YoY Growth Rate

Revenue declining

EPS Growth

+32.1% YoY

YoY Growth Rate

EPS growth accelerating

R&D Spend

$66M/ year

→ Flat (+3% vs prior year)

>1,000% of revenue

57.0x the sector average (18%)

Steady R&D investment year-over-year

Insider Activity

43.6%ownership

→ Flat

Insiders holding steady — not selling despite ability to

Cash Runway

~11 months

$62M cash & investments

Quarterly Free Cash Flow

→ Burn rate stable

Short runway — potential dilution ahead through share issuance

Cash watch

Korro Bio has less than a year of cash at its current burn rate. Growth investors should watch for potential share dilution from future fundraising — that directly reduces your ownership.

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.

Each metric is explained in plain language so you know exactly what you're looking at. Start your free trial now.

Quality

Gross Margin

33.0%

Modest — 33.0% gross margin

Operating Margin

-1366.4%

Losing money on operations — -1366.4%

ROCE

-169.8%

Weak — -169.8% return on capital

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

Full breakdown available with your free trial

See every metric, trend, and what it means for this stock.

Try free

Growth

Sales YoY

+181.5%

Fast-growing sales (181.5% YoY)

EPS YoY

N/A

—

Data not available

EPS Consistency

N/A

Data not available

Full breakdown available with your free trial

See every metric, trend, and what it means for this stock.

Try free

Cash Flow

Cash Conversion

N/A

—

Data not available

FCF Margin

-1237.2%

Burning cash (-1237.2%)

Free cash flow is negative. They are burning cash, not generating it.

Full breakdown available with your free trial

See every metric, trend, and what it means for this stock.

Try free

Stability

Debt / Equity

0.00

Conservative — low debt load (0.00)

Interest Cover

N/A

—

Data not available

Full breakdown available with your free trial

See every metric, trend, and what it means for this stock.

Try free

Valuation

P/E Ratio (TTM)

N/M

—

Negative earnings — P/E not meaningful

P/E vs Forward

N/A

not available

Data not available

Full breakdown available with your free trial

See every metric, trend, and what it means for this stock.

Try free

Dividends

Not applicable for this business.

🔒 See full fundamentals and if they are improving or declining — click here for your free trial now.

Start free trial