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AMPX Amprius Technologies Inc.

Industrials, filed as AMPRIUS TECHNOLOGIES INC (COMMON STOCK), Equity As of 2026 Q2 among managers we track Quote on Google Finance, opens in a new tab

Bought by 2 managers in 2026 Q2

  • 2 Owners
  • Max 1.0%
  • $18M
  • 1 new 1 add

In 2026 Q2 Spencer Waxman opened a position in Amprius Technologies, and Polen Capital Management added.

Who owns this now

Largest portfolio weights among holders, up to 1.0% (Spencer Waxman, Shannon River Fund Management). Not free-float ownership.

  1. Spencer Waxman New 1.0%
  2. Polen Capital Management Add 0.06%

Who owns AMPX

Sorted by value, long equity only, as of 2026 Q2.

History
Spencer Waxman, Shannon River Fund Management 1.0% New 1.0% 838,887 $12M History
Polen Capital Management 0.06%, was 0.05% Add +10.3% 465,598 $6.5M History

2 current, options excluded

Weight bar: held both quarters added sold at this quarter’s reported price

Insider trades

Open-market buys and sales by AMPX's executives, directors and 10% owners in the last 12 months, from their Form 4s

All AMPX insider trades
  • None no insider bought on the open market
  • $16.2M sold by 4 insiders outside a trading plan
  • $64M sold by 2 insiders under 10b5-1 plans
  1. Thomas M Stepien CEO
    Sale
    $80K 8,000 shares at $10.03 1.3% of stake
    Traded Aug 24 Filed Aug 25
    ↗
  2. Donald R Dixon Director
    Sale
    $1.5M 85,000 shares at $17.17 19% of stake
    Traded Jun 15 Filed Jun 16
    ↗
  3. Donald R Dixon Director
    Sale
    $765K 40,000 shares at $19.13 8.3% of stake
    Traded Jun 9 Filed Jun 11
    ↗
  4. Thomas M Stepien CEO
    Sale
    $42K 2,000 shares at $20.97 0.3% of stake
    Traded Jun 4 Filed Jun 5
    ↗
  5. Donald R Dixon Director
    Sale
    $320K 17,895 shares at $17.90 3.6% of stake
    Traded May 26 Filed May 28
    ↗
  6. Kang Sun Director
    Planned sale
    $23.9M 1,500,000 shares at $15.91 53% of stake
    Traded Apr 1 Filed Apr 2
    ↗
  7. Kang Sun Director
    Planned sale
    $4.1M 217,869 shares at $18.80 79% of stake
    Traded Mar 23 Filed Mar 24
    ↗
  8. Wen Hsuan Hsieh Director
    Sale
    $7.6M 413,146 shares at $18.44 90% of stake
    Traded Mar 12 Filed Mar 13
    ↗
  9. Steven Chu Director
    Sale
    $5.9M 322,197 shares at $18.20 72% of stake
    Traded Mar 10–12 Filed Mar 12
    ↗
  10. Constantin Ionel Stefan Chief Technology Officer
    Planned sale
    $476K 39,690 shares at $12.00 5% of stake
    Traded Jan 28 Filed Jan 30
    ↗
  11. Constantin Ionel Stefan Chief Technology Officer
    Planned sale
    $6.8M 567,707 shares at $12.03 43% of stake
    Traded Jan 21–23 Filed Jan 23
    ↗
  12. Kang Sun Director
    Planned sale
    $11M 993,733 shares at $11.06 42% of stake
    Traded Jan 16–20 Filed Jan 20
    ↗
  13. Kang Sun Director
    Planned sale
    $5.1M 506,267 shares at $10.10 27% of stake
    Traded Jan 12 Filed Jan 14
    ↗
  14. Constantin Ionel Stefan Chief Technology Officer
    Planned sale
    $2.1M 198,255 shares at $10.51 21% of stake
    Traded Dec 11, 2025 Filed Dec 15, 2025
    ↗
  15. Kang Sun CEO
    Planned sale
    $10.6M 1,000,000 shares at $10.60 40% of stake
    Traded Nov 17, 2025 Filed Nov 19, 2025
    ↗

Also filed in the last 12 months, not counted as buying or selling: 26 option exercises, 13 sales to cover taxes, 10 stock grants, and 7 gifts.

SEC filings

Recent issuer filings from EDGAR, 16 shown.

Filed Form Detail Links
8-K 1.01,9.01 Filing Doc
8-K 1.01,2.03,9.01 Filing Doc
SCHEDULE 13G/A — Filing Doc
10-Q Filing Doc
8-K 2.02,9.01 Filing Doc
SCHEDULE 13G/A — Filing Doc
8-K 5.07 Filing Doc
8-K/A 3.02 Filing Doc
10-Q Filing Doc
8-K 1.01,3.02,9.01 Filing Doc
8-K 2.02,9.01 Filing Doc
DEF 14A Filing Doc
DEFA14A Filing Doc
SCHEDULE 13G — Filing Doc
8-K 4.01 Filing Doc
SCHEDULE 13G/A — Filing Doc

Source: SEC EDGAR submissions, updated 15 days ago. All on EDGAR

Financials

US-GAAP annual figures by fiscal year, as tagged in Form 10-K. Each value links to its SEC filing.

Income statement

Metric FY2023 FY2024 FY2025
Revenue — $23.57M $71.91M
Gross profit -$14.68M -$18.33M $8.26M
Gross margin * — -77.8% 11.5%
Net income -$36.78M -$44.67M -$44.02M
Net margin * — -189.5% -61.2%

Balance sheet

Metric FY2023 FY2024 FY2025
Total current assets $50.52M $68.76M $126.44M
Total non-current assets * $57.21M $52.36M $30.45M
Total assets $107.74M $121.12M $156.89M
Total current liabilities $13.46M $17.21M $17.87M
Total non-current liabilities * $34.48M $34.44M $35.21M
Total equity $59.8M $69.47M $103.82M

Cash flow

Metric FY2023 FY2024 FY2025
Cash from operations -$25.55M -$33.35M -$31.13M
Cash from investing -$17.55M -$3.21M -$4.4M
Cash from financing $19.17M $47.15M $71.04M
Net change in cash * -$23.94M $10.59M $35.51M

Source: SEC companyfacts (US-GAAP 10-K). A * marks a computed figure, not a single XBRL tag. Fiscal years are as the issuer labels them. Follow The Filings does not adjust or audit these figures.

Ownership over time

13Fs that reported it each quarter. Click a bar for that quarter’s holders.

Further reading

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