AMPX at a glance
Amprius Technologies, Inc. (AMPX, SEC CIK 1899287) filed its latest 10-K annual report on March 6, 2026, a 10-Q quarterly report on August 6, 2026, an 8-K current report on September 28, 2026 and Form 4 insider filings as recently as August 25, 2026. SignalX summarizes each filing with AI and tracks the company's insider trades and institutional holders.
- For the fiscal year ended December 31, 2025 (FY2025), Amprius Technologies, Inc. (AMPX) reported revenue of $71.9 million (up 205.1% from FY2024) and a net loss of $44.0 million. Diluted EPS was -$0.35.
- As of June 30, 2026, 31 institutional investment managers tracked by SignalX reported holding Amprius Technologies, Inc. (AMPX) shares worth $605.3 million in 13F-HR filings.
- The most recent insider open-market sale reported on Form 4 was by Stepien Thomas M on August 24, 2026 of 8,000 shares at $10.03 per share.
- In the last 90 days, AMPX insiders reported 0 open-market purchases ($0) and 4 open-market sales ($1.3M) on Form 4, a net sale of $1.3M.
Source: SEC EDGAR (XBRL financial data, 13F-HR and Form 4 filings).
- Revenue · FY2025
- $71.9M
- +205.1% vs prior year
- Insiders · 90 days
- 0 buys · 4 sells
- Net −$1.3M
- 13F holders
- 31 funds
- $605.3M · +0 vs prior quarter
- Latest 8-K
- Sep 28, 2026
- Item 1.01
AI 10-K Annual Report Analysis
Latest 10-K, fiscal year ended Dec 31, 2025
Business Overview
- Core business: develops and markets high-performance lithium-ion silicon anode batteries focused on aviation, ground, and marine electric mobility
- New product: full commercial launch of SiCore silicon anode batteries in January 2024 with annual production capacity >2.0 GWh via global contract manufacturing
- Strategic shift: terminated large 774,000 sq ft Colorado lease in early 2026 to emphasize outsourced contract manufacturing for rapid scalable production and minimal capital investment
- Quantitative highlight: access to >2.0 GWh annual SiCore battery production capacity; expanded Fremont pilot line to 10 MWh capacity; $14.8 million US government contract awarded in 2025
- Noteworthy fact: unveiled >500 Wh/kg prototype SiMaxx battery in March 2023, half the weight and volume of current state-of-the-art cells; still in development as of Dec 2025
Risk Factors
- Regulatory risk: NDAA compliance required for battery components under Defense Innovation Unit program; sourcing compliant suppliers challenging, risking delays and program standing
- Geopolitical risk: Reliance on suppliers in China exposes operations to U.S.-China trade conflicts and tariffs, increasing costs and supply chain disruption risks
- Operational risk: Dependence on third-party manufacturing, including Berzelius, without established commercial terms risks supply shortages, price hikes, and quality control issues
- Market disruption risk: Emerging alternative battery technologies and competitors with greater resources threaten market share expansion and profitability
- Financial risk: Early-stage company with history of losses, needing significant capital for manufacturing scale-up and uncertain cost targets to achieve profitability
Management Discussion & Analysis
- Revenue $73.0M, up 202% YoY from $24.2M driven by $48.1M increase in SiCore battery sales and $0.5M in government grants
- Gross margin 11% vs (76)% loss YoY, driven by higher sales volume; operating loss stable at $(46.6)M vs $(46.3)M
- Best segment: SiCore battery sales $48.1M increase; Worst: customization design services revenue down $1.2M
- Cash $90.5M at year-end 2025; $97.5M net proceeds from stock sales under Sales Agreement; no debt; $19.1M impairment charge on Colorado facility lease termination
- Management expects to expand contract manufacturing, increase pilot line capacity to 10 MWh in 2026, and sees risks from global supply chain and regulatory changes impacting defense contracts
AI summary of the AMPX 10-K filed . Generated from the filing text; verify against the original.View on SEC EDGARHow to read a 10-K
AI 10-Q Quarterly Report Analysis
Latest 10-Q, quarter ended Jun 30, 2026
Management Discussion & Analysis
- Q2 revenue $34.0M, up 126% YoY from $15.1M, driven by SiCore battery sales
- Gross margin 27% vs 9% YoY; gross profit $9.3M vs $1.3M
- SiCore batteries best-performing product, with battery sales up $19.5M
- Cash and equivalents $74.5M at June 30, 2026; no debt
- Outlook: SiCore demand supports capacity expansion, with supply-chain, tariff, and geopolitical headwinds
Risk Factors
- Executive stock-sale risk: Dr. Sun terminated a plan covering up to 7,217,869 shares on June 29, 2026
- Insider selling risk: Dr. Chu adopted a plan covering up to 388,057 shares, expiring March 13, 2027
- Securities-compliance risk: Rule 10b5-1 plan activity disclosed under Regulation S-K Item 408(a)
AI summary of the AMPX 10-Q filed . Generated from the filing text; verify against the original.View on SEC EDGAR10-K vs 10-Q vs 8-K
AI 8-K Current Report Analysis
The most recent material events, by 8-K item
Item 1.01: Entry into a Material Definitive Agreement
- Up to $75 million fixed-price U.S. government award for domestic silicon-anode battery production
- Approximately $22 million currently obligated; remaining funding subject to future appropriations
Item 1.01: Entry into a Material Definitive Agreement
- Fremont facility lease extended 84 months, from July 1, 2027 through June 30, 2034
- Approximately $10.5 million in future lease payments, creating a significant long-term operating obligation
Item 2.02: Results of Operations and Financial Condition
- Filing references an Earnings Release covering fiscal year 2026 results
- Investors should review the attached Earnings Release for financial results and management commentary
Item EX-99.1: Item EX-99.1
- Q2 revenue $34.0M, up 126% YoY, with gross margin improving to 27% from 9%, validating accelerating commercial adoption
- Adjusted net loss $3.2M, down 50% YoY, while GAAP loss included a $1.9M non-cash warrant modification charge
AI summaries of AMPX 8-K current reports filed with the SEC. What 8-K item codes mean
SignalX for AMPX
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Recent Insider Transactions (Form 4)
Latest reported trades by officers, directors and 10% owners
| Insider | Type | Date | Shares | Price |
|---|---|---|---|---|
| Stepien Thomas M | G | Aug 25, 2026 | 5,000 | - |
| Stepien Thomas M | G | Aug 25, 2026 | 5,000 | - |
| Stepien Thomas M | G | Aug 25, 2026 | 5,000 | - |
| Stepien Thomas M | G | Aug 25, 2026 | 346 | - |
| Stepien Thomas M | A | Aug 25, 2026 | 346 | - |
| Stepien Thomas M | Sell | Aug 24, 2026 | 8,000 | $10.03 |
| Sun Kang | Sell | Aug 21, 2026 | 62,101 | $10.34 |
| Stefan Constantin Ionel | Sell | Aug 21, 2026 | 29,681 | $10.34 |
Financial SummaryXBRL
| Metric | FY2023 | FY2024 | FY2025 |
|---|---|---|---|
| Profitability | |||
| Revenue | - | $23.6M | $71.9M |
| Gross Profit | - | - | $8.3M |
| Operating Income | - | -$46.3M | -$46.6M |
| Net Income | -$36.8M | -$44.7M | -$44.0M |
| Gross Margin | - | - | 11.5% |
| Op. Margin | - | -196.3% | -64.9% |
| Net Margin | - | -189.5% | -61.2% |
| Balance Sheet | |||
| Total Assets | - | $121.1M | $156.9M |
| Equity | $59.8M | $69.5M | $103.8M |
| ROE | -61.5% | -64.3% | -42.4% |
| Per Share | |||
| EPS | $-0.43 | $-0.45 | $-0.35 |
| Cash Flow | |||
| Operating CF | - | -$33.4M | -$31.1M |
| CapEx | - | $3.2M | $4.4M |
Source: XBRL data in Amprius Technologies, Inc. (AMPX)'s 10-K filings on SEC EDGAR, in USD. Compare across companies →
13F Fund Holdings: Quarterly Trend
Latest: Q2 2026Aggregate AMPX share value held by 13F filers tracked by SignalX, by quarter.
Quarterly totals table
| Quarter | Funds | Total value |
|---|---|---|
| Q2 2026 | 31 | $605.3M |
| Q1 2026 | 31 | $613.7M |
| Q4 2025 | 25 | $250.6M |
| Q3 2025 | 24 | $332.9M |
| Q2 2025 | 22 | $101.1M |
| Q1 2025 | 20 | $25.5M |
| Q4 2024 | 14 | $26.8M |
| Q3 2024 | 9 | $2.5M |
- BlackRock+2.11M (+23%)
- Morgan Stanley+1.94M (+61%)
- Renaissance Technologies LLC+1.05M (+292%)
- Two Sigma Investments+812.6K (+23%)
- Vanguard Capital Management LLC+654.1K (+13%)
- JPMorgan Chase & Co−1.09M (-90%)
- D.E. Shaw & Co−403.6K (-38%)
- T. Rowe Price Group−261.5K (-14%)
- Raymond James Financial−89.6K (-73%)
- Principal Financial Group−14.9K (-59%)
Source: 13F-HR filings on SEC EDGAR (aggregated from 176 fund-quarter rows). Reflects only 13F filers tracked by SignalX, not the full institutional ownership universe. How 13F filings work
AMPX filing archive
AI analysis pages for each 10-K, 10-Q and 8-K
10-K annual reports
10-Q quarterly reports
Latest 2026 SEC Filings: 10-K, 10-Q, 8-K & Form 4
| Form | Filing date | Period | Analysis | SEC |
|---|---|---|---|---|
| 8-K | Sep 28, 2026 | - | Analysis | - |
| 4 | Aug 25, 2026 | - | - | - |
| 4 | Aug 25, 2026 | - | - | - |
| 4 | Aug 25, 2026 | - | - | - |
| 8-K | Aug 13, 2026 | - | Analysis | - |
| 10-Q | Aug 6, 2026 | Jun 30, 2026 | Analysis | |
| 8-K | Aug 4, 2026 | - | Analysis | - |
| 8-K | Jun 17, 2026 | - | Analysis | - |
| 4 | Jun 16, 2026 | - | - | - |
| 4 | Jun 16, 2026 | - | - | - |
| 4 | Jun 16, 2026 | - | - | - |
| 4 | Jun 16, 2026 | - | - | - |
| 4 | Jun 11, 2026 | - | - | - |
| 4 | Jun 5, 2026 | - | - | |
| 4 | May 28, 2026 | - | - | |
| 4 | May 28, 2026 | - | - | |
| 4 | May 28, 2026 | - | - | |
| 4 | May 28, 2026 | - | - | |
| 4 | May 26, 2026 | - | - | |
| 4 | May 26, 2026 | - | - | |
| 4 | May 26, 2026 | - | - | |
| 8-K | May 19, 2026 | - | Analysis | |
| 4 | May 7, 2026 | - | - | |
| 8-K | May 7, 2026 | - | Analysis | |
| 10-Q | May 7, 2026 | Mar 31, 2026 | Analysis |
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AMPX SEC filings: frequently asked questions
Are AMPX insiders buying or selling?
In the last 90 days, Amprius Technologies, Inc. (AMPX) officers, directors and 10% owners reported no open-market purchases and 4 open-market sales worth $1.3 million by 3 insiders on Form 4. Many insider sales are pre-planned or for taxes, so purchases usually carry more information.
Which institutions hold AMPX stock?
As of June 30, 2026, the largest Amprius Technologies, Inc. (AMPX) holders among the 13F filers tracked by SignalX were BlackRock ($157.1 million), Vanguard Capital Management LLC ($77.1 million), Morgan Stanley ($70.8 million), Two Sigma Investments ($59.9 million), State Street Corp ($44.9 million). 13F-HR reports are filed up to 45 days after each quarter ends.
What was AMPX's revenue in fiscal year 2025?
For the fiscal year ended December 31, 2025 (FY2025), Amprius Technologies, Inc. (AMPX) reported revenue of $71.9 million (up 205.1% from FY2024) and a net loss of $44.0 million. Diluted EPS was -$0.35. The figures come from the XBRL data in the 10-K.
What are the main risks in AMPX's latest 10-K?
In the 10-K filed March 6, 2026, Amprius Technologies, Inc. (AMPX) flagged: Regulatory risk: NDAA compliance required for battery components under Defense Innovation Unit program; sourcing compliant suppliers challenging, risking delays and program standing. Geopolitical risk: Reliance on suppliers in China exposes operations to U.S.-China trade conflicts and tariffs, increasing costs and supply chain disruption risks. (AI summary of the Risk Factors section.)
What did AMPX report in its latest 8-K?
Amprius Technologies, Inc. (AMPX) filed an 8-K on September 28, 2026 reporting Item 1.01 (Entry into a Material Definitive Agreement). Up to $75 million fixed-price U.S. government award for domestic silicon-anode battery production.
What are the latest AMPX SEC filings?
Amprius Technologies, Inc. (AMPX) filed its latest 10-K annual report on March 6, 2026, a 10-Q quarterly report on August 6, 2026, an 8-K current report on September 28, 2026 and a Form 4 insider filing on August 25, 2026.
What is AMPX's SEC CIK number?
Amprius Technologies, Inc. (AMPX)'s SEC Central Index Key (CIK) is 1899287. EDGAR lists every AMPX filing under that number.
Ask anything about AMPX
The research agent reads AMPX's filings, financials, insider trades and 13F holders, then answers with sources.