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Amprius Technologies

AMPX
25
Electrical Equipment & Parts · Industrials
Winston Score
25
Winston is worried
Below-average fundamentals — multiple weak pillars.
Data as of Aug 23, 2026 · filings through Jun 30, 2026
How the score breaks down
Quality
Weak
Growth
Good
Cash Flow
Weak
Stability
Data not available
Valuation
Data not available

Winston Score History

The full picture

Amprius Technologies makes rechargeable lithium-ion batteries with silicon anodes instead of the traditional graphite ones. This design allows the batteries to store significantly more energy in a lighter package, which appeals to customers in aerospace, defense, and high-performance electric vehicles. The company is known for producing some of the highest energy-density batteries commercially available today.

Amprius earns revenue by selling battery cells and packs directly to customers, with most business currently tied to government and defense contracts alongside early commercial partnerships. The company operates primarily in the United States and is still relatively small, with its competitive edge resting on its proprietary silicon nanowire anode technology, which is difficult for competitors to replicate quickly. However, Amprius is not yet profitable, and its main challenge is scaling up manufacturing capacity fast enough to bring costs down and reach the commercial volumes needed to turn a profit.

Growth Profile

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

Revenue Growth

+125.9% YoY

YoY Growth Rate

Strong revenue growth

EPS Growth

+23.5% YoY

YoY Growth Rate

Steady EPS growth

Insider Activity

7.1%ownership

Flat

Insider ownership roughly steady over the past year

Cash Runway

~4 years

$75M cash & investments

Quarterly Free Cash Flow

↓ Burn rate worsening

$75M cash & investments at current burn rate

Strong grower

Amprius Technologies is growing revenue at 126% year-over-year. The Winston Score penalises unprofitable companies, but revenue at this pace tells a different story — this is a company still in "build mode."

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

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Quality

Profit per sale
Gross Margin
27.3%
Modest — 27.3% gross margin
Profit after running costs
Operating Margin
-12.6%
Losing money on operations — -12.6%
Return on the money invested
ROCE
-14.8%
Weak — -14.8% return on capital

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

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Growth

Sales growth
Sales YoY
+143.6%
Fast-growing sales (+143.6% YoY)
Profit growth
EPS YoY
N/A
Data not available
How steady the profit is
EPS Consistency
6/8 quarters
Earnings grew in most of the last 8 quarters

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Cash Flow

Profit that turns into cash
Cash Conversion
N/A
Data not available
Spare cash per sale
FCF Margin
-53.5%
Burning cash (-53.5%)

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

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Stability

What it owes vs what it owns
Debt / Equity
N/A
Data not available
Covers its interest
Interest Cover
N/A
Data not available

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Valuation

Price vs profit
P/E Ratio (TTM)
N/M
no trend
Negative earnings — P/E not meaningful
Cheaper or dearer next year
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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