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Corning

GLW.DE
58
Hardware, Equipment & Parts · Technology
Price
€133.82
-4.82 (-3.48%)
Market Cap
€115.17B
Exchange
Frankfurt Stock Exchange
Winston Score
58
Winston is curious
A decent business — some strong pillars, some weaker.

Share count rising — dilution

+3.2% over 4y

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

Diluted shares outstanding: 844.0M (2021) → 871.0M (2025)

Corning makes specialty glass and materials that go inside everyday products. Its most famous product is Gorilla Glass, the tough screen cover used on smartphones made by Apple, Samsung, and other phone brands. The company also makes fiber-optic cables used to carry internet data, glass for TV screens, and materials used in cars and laboratories.

Corning earns money by selling these materials to large manufacturers around the world. It operates globally, with major customers in the United States, Asia, and Europe, and generates roughly $14 billion in annual revenue. Its main competitive advantage is deep technical expertise in specialty glass that is very hard for competitors to copy. The biggest growth driver right now is demand for fiber-optic cable, as telecom companies and data center operators spend heavily to expand high-speed internet networks — though a slowdown in smartphone sales or capital spending by telecom companies remains a key risk.

Winston Score History

Growth Profile

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

Revenue Growth

+19.6% YoY

YoY Growth Rate

Steady revenue growth

EPS Growth

+138.9% YoY

YoY Growth Rate

Strong earnings growth

R&D Spend

$1.1B/ year

Flat (+2% vs prior year)

7.1% of revenue

Below sector average (15%)

Steady R&D investment year-over-year

Insider Activity

8.2%ownership

Flat

Insiders holding steady — not selling despite ability to

Cash Position

Cash flow positive

$1.8B cash & investments

Quarterly Free Cash Flow

→ Burn rate stable

Company generates more cash than it spends — no dilution risk from fundraising

Growth + cash flow

Corning is a rare growth stock that's already generating positive cash flow while growing at 20%. The Winston Score doesn't fully credit this transition from "burner" to "earner."

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
36.6%
Modest — 36.6% gross margin
Operating Margin
15.1%
Healthy — 15.1% operating margin
ROCE
3.0%
Weak — 3.0% return on capital

ROIC between 0% and 5%. They earn a few cents back per dollar invested in the business.

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Growth

Sales YoY
+19.9%
Fast-growing sales (19.9% YoY)
EPS YoY
+305.8%
Earnings growing fast (305.8% YoY)

Earnings growing 25%+ a year. The compounder zone.

EPS Consistency
8/8 quarters
Every recent quarter grew earnings vs last year

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Cash Flow

Cash Conversion
161%
Turns 161% of profit into real cash
FCF Margin
9.2%
Modest free cash flow (9.2%)

FCF margin between 0% and 10%. Some cash from sales, but not a lot.

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Stability

Debt / Equity
0.77
Moderate — manageable debt (0.77)
Interest Cover
7.18x
Adequate interest coverage (7.2x)

Interest coverage between 3 and 8. Profits cover interest several times over.

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Valuation

P/E Ratio (TTM)
63.4x
Expensive — P/E 63.4

P/E over 35. The market is pricing in heavy, sustained growth.

P/E vs Forward
+11.1
GROWING
Earnings expected to grow meaningfully — cheaper on forward P/E (63.4 → 52.3)

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Dividends

Dividend Yield
0.44%
Small dividend — 0.44% yield

Modest yield. The bulk of any return needs to come from price appreciation.

Dividend Growth
-2.3%
Dividend cut (-2.3% YoY) — warning sign

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