Amprius Technologies, Inc.
AMPXNYSETechnology · Miscellaneous Electrical Machinery, Equipment & Supplies · DE · SEC filings ↗ · Compare ⊕
View price & chart on Yahoo Finance ↗Financials
SEC XBRL · annual| FY25 | FY24 | FY23 | FY22 | FY21 | |
|---|---|---|---|---|---|
| Revenue | $71.9M | $23.6M | $8.8M | $4.4M | $2.8M |
| Operating income | −$46.6M | −$46.3M | −$38.7M | −$18.0M | −$10.6M |
| Net income | −$44.0M | −$44.7M | −$36.8M | −$17.3M | −$9.9M |
| Total assets | $156.9M | $121.1M | $107.7M | $83.2M | $18.5M |
| Total liabilities | $53.1M | $51.7M | $47.9M | $10.1M | $4.7M |
| Equity | $103.8M | $69.5M | $59.8M | $73.0M | $13.9M |
| EPS (diluted) | $-0.35 | $-0.45 | $-0.43 | $-0.24 | $-0.15 |
| Shares out. | 117.9M | 91.6M | 84.6M | 84.6M | 65.8M |
Reported figures from the company's SEC filings (XBRL). Blank where a line item isn't cleanly tagged — never estimated.
Key ratios
from filings · FY2025- Operating margin
- −64.9%
- Net margin
- −61.2%
- Return on equity
- −42.4%
- Return on assets
- −28.1%
- Return on capital (ROCE)
- −33.6%
- Liabilities / assets
- 33.8%
- Debt / equity
- 0.51×
- Book value / share
- $0.88
- Revenue growth (YoY)
- 205.1%
- Net income growth (YoY)
- —
Computed from the company's own SEC figures — no market price, so these are facts, not a valuation. Book value per share is reported equity ÷ shares; it is not the stock price.
Financial health
forensic scores · FY2025- Altman Z″ (distress)
- 0.06distress
- Accruals / assets
- −8.2%clean
- Piotroski F-Score
- 6/9mixed
Altman Z″is a textbook bankruptcy-distress score from book values only (>2.6 safe · 1.1–2.6 grey · <1.1 distress). Accruals = (net income − operating cash flow) ÷ assets; persistently high accruals are an earnings-quality red flag. Beneish M-Scoreis an eight-ratio screen comparing this year with last (M > −1.78 = elevated manipulation-risk screen, not proof). Piotroski F-Scorecounts how many of nine fundamental-health checks pass (shown as passed / applicable; we use operating margin and total liabilities as documented proxies where the exact input isn't XBRL-tagged). Computed from SEC filings — descriptive factors, not advice or a forecast.
Quality score
EDS ScoreOur own multi-factor score from free SEC data — profitability, growth, financial strength, earnings quality, and event/ownership catalysts. No market price and no licensed model: each axis is the share of source-backed checks it passes. Descriptive factors, not advice or a forecast. What these scores mean →
Signs
● 2 severe● 3 warning● 3 good- Altman Z″ in the distress zone
- Filed a late-filing notice (Form NT) — missed an SEC deadline
- Operating losses (negative operating margin)
- Reported a net loss
- Negative operating cash flow
- Revenue is growing year-over-year
- Conservative leverage (liabilities < 50% of assets)
- Clean earnings (low accruals)
Derived from the company's own SEC figures (fundamentals, forensic scores, filing discipline) — descriptive factors, not advice or a forecast.
Risk flags
late SEC filings- NT 10-Qmissed a reporting deadline ↗May 17, 2022
A Form NT means the company notified the SEC it would file a periodic report late — often an accounting, audit or liquidity warning sign. Also search SEC enforcement actions for this company.
5%+ owners
SEC Schedule 13D / 13G · last 3 yrs- Jane Street Group, LlcPassive (13G)Apr 28, 2026
- Vanguard Group IncPassive (13G)Mar 26, 2026
- Blackrock, Inc.Passive (13G)Oct 17, 2025
- Saif Partners Iv L.P.Passive (13G)Aug 14, 2025
- Salzman Alan EPassive (13G)Aug 6, 2025
Holders who disclosed a 5%+ stake. 13D signals intent to influence or control; 13G is a passive holding. Latest filing per holder — open it for the exact stake.
Insider transactions
SEC Form 4 · most recent| Insider | Date | Type | Shares | Price |
|---|---|---|---|---|
| Sun KangDirector | May 27, 2026 | Sell | 356 | $17.19 |
| Stepien Thomas MOfficer — Chief Executive Officer | May 27, 2026 | Sell | 4,375 | $17.19 |
| Stefan Constantin IonelOfficer — Chief Technology Officer | May 27, 2026 | Sell | 3,208 | $17.19 |
| Dixon Donald RDirector | May 26, 2026 | Sell | 17,895 | $17.90 |
| Sun KangDirector | May 21, 2026 | Sell | 67,796 | $14.79 |
| Stefan Constantin IonelOfficer — Chief Technology Officer | May 21, 2026 | Sell | 28,812 | $14.79 |
| Stepien Thomas MOfficer — Chief Executive Officer | May 21, 2026 | Sell | 60,702 | $14.79 |
| Sun KangDirector | May 5, 2026 | Grant | 6,250 | $0.00 |
| Sun KangDirector | Apr 1, 2026 | Option exercise | 1.3M | $1.78 |
| Sun KangDirector | Mar 23, 2026 | Sell | 152,823 | $18.69 |
| Hsieh Wen HsuanDirector | Mar 12, 2026 | Option exercise | 270,251 | $2.61 |
| Chu StevenDirector | Mar 10, 2026 | Option exercise | 104,132 | $0.62 |
Headline trade per Form 4 (officers, directors, 10%+ owners). Buy/sell read from the filing's structured data — blank where a field isn't cleanly tagged.
Short interest
FINRA · bi-monthly| Settlement | Shares short | Days to cover | Δ vs prior |
|---|---|---|---|
| May 15, 2026 | 22.7M | 2.2 | -2.3% |
| Apr 30, 2026 | 23.2M | 2.7 | +7.8% |
| Apr 15, 2026 | 21.6M | 3.0 | +20.3% |
| Mar 31, 2026 | 17.9M | 2.3 | +0.3% |
| Mar 13, 2026 | 17.8M | 1.3 | -6.8% |
Shares sold short as reported to FINRA. Days-to-cover = short shares ÷ average daily volume — higher means more potential squeeze pressure.
Material events
SEC Form 8-K · most recent- Entered a material agreement · Unregistered equity saleMay 7, 2026
- Results of operationsMay 6, 2026
- Changed auditorApr 21, 2026
- Results of operationsMar 4, 2026
- Terminated a material agreementFeb 3, 2026
- Other material eventJan 12, 2026
- Director / officer changeDec 22, 2025
- Results of operationsNov 6, 2025
Events the company reported on Form 8-K, labelled by the SEC item code it filed under — its own classification, not our interpretation.
Recent SEC filings
All filings ↗Event-driven situations (1)
Spot an error in this record? Report it. Every correction is verified against the source filing before we change anything.