Amprius Technologies (AMPX-WT) Stock: Why It's Down Today
Updated Oct 20, 2026, 1:16 PM ET · intraday price
- Trading at $1.77 as of 1:16 PM ET, -0.57% vs the prior close of $1.78.
- Volume 3.33K shares, 1.0x its 50-day average.
- No new SEC filings since the prior session.
- No new insider buys or sales reported since the prior session.
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AMPX-WT dips 0.6% to $1.77. Trading at $1.77 (intraday, 1:16 PM ET), -0.57% vs the prior close of $1.78. Day range $1.74–$1.82, opened at $0.00.
AMPX-WT daily analysis — what happened
A plain-English, data-only note for every US trading day (today's note updates every 2 hours while the market is open). Newest first; older days stay archived below.
Oct 20, 2026 — AMPX-WT dips 0.6% to $1.77
- Trading at $1.77 (intraday, 1:16 PM ET), -0.57% vs the prior close of $1.78. Day range $1.74–$1.82, opened at $0.00.
- Volume was 3.33K shares, 1.0x its 50-day average of 3.25K.
- 52-week range $1.74–$1.90; the current price sits at 18% of that range, 7.1% below the 52-week high.
Oct 19, 2026 — AMPX-WT slides 5.8% to $1.78
- Closed at $1.78, -5.82% vs the prior close of $1.89. Day range $1.78–$1.90, opened at $0.00.
- Volume was 3.25K shares, 0.4x its 50-day average of 7.82K — lighter than usual.
- 52-week range $1.78–$1.96; today's close sits at 0% of that range, 9.0% below the 52-week high.
AMPX-WT bull case vs bear case (from the data)
- Annual revenue grew 205.1% in the latest fiscal year (SEC XBRL).
- Latest fiscal-year net income: loss of $44.02M.
- Insider selling outweighs buying: 25 sales vs 0 open-market buys among the 25 most recent reported insider trades (Form 4, last 12 months).
- Share count up 16.8% in a year (dilution).
- Thin trading (under $2M a day on average) can mean wide bid/ask spreads.
AMPX-WT latest news & SEC filings
Every SEC filing by or about AMPX-WT in the last 120 days, explained in plain English. Updated daily, with a same-day refresh for new filings.
Oct 9, 2026 · Form S-3ASR — S-3ASR filing
S-3ASR filing
An offering document: new shares or debt may be sold, which can increase the share count (dilution) or debt load. Size and terms are in the prospectus.
Sep 28, 2026 · Form 8-K — Major event / current report
Current report — a filing companies must make within 4 business days of a major event
- Item 1.01 — Signed a material agreement.
Aug 25, 2026 · Form 4 — Insider trade
Insider trade report (Form 4) — a director, officer or 10%+ owner changed their holdings
- Sun Kang sold 62,101 shares at $10.34 (≈$642.12K) on Aug 21, 2026
- Sun Kang sold 62,101 shares at $10.34 (≈$642.12K) on Aug 21, 2026
- Sun Kang sold 62,101 shares at $10.34 (≈$642.12K) on Aug 21, 2026
- Sun Kang sold 62,101 shares at $10.34 (≈$642.12K) on Aug 21, 2026
Open-market purchases (P) and sales (S) are shown in colour; awards, exercises and tax withholding are routine pay-related moves. Many sales are pre-planned under 10b5-1 plans.
Aug 25, 2026 · Form 144 — Planned insider sale
Notice of proposed sale (Form 144) — an insider or affiliate plans to sell restricted or control shares
A notice of intent, not a completed sale. Any actual sale by a director or officer shows up later on Form 4.
Aug 25, 2026 · Form 4 — Insider trade
Insider trade report (Form 4) — a director, officer or 10%+ owner changed their holdings
- Stefan Constantin Ionel sold 29,681 shares at $10.34 (≈$306.90K) on Aug 21, 2026
- Stefan Constantin Ionel sold 29,681 shares at $10.34 (≈$306.90K) on Aug 21, 2026
- Stefan Constantin Ionel sold 29,681 shares at $10.34 (≈$306.90K) on Aug 21, 2026
- Stefan Constantin Ionel sold 29,681 shares at $10.34 (≈$306.90K) on Aug 21, 2026
Open-market purchases (P) and sales (S) are shown in colour; awards, exercises and tax withholding are routine pay-related moves. Many sales are pre-planned under 10b5-1 plans.
Aug 25, 2026 · Form 144 — Planned insider sale
Notice of proposed sale (Form 144) — an insider or affiliate plans to sell restricted or control shares
A notice of intent, not a completed sale. Any actual sale by a director or officer shows up later on Form 4.
Aug 25, 2026 · Form 4 — Insider trade
Insider trade report (Form 4) — a director, officer or 10%+ owner changed their holdings
- Stepien Thomas M sold 8,000 shares at $10.03 (≈$80.24K) on Aug 24, 2026
- Stepien Thomas M sold 8,000 shares at $10.03 (≈$80.24K) on Aug 24, 2026
- Stepien Thomas M sold 8,000 shares at $10.03 (≈$80.24K) on Aug 24, 2026
- Stepien Thomas M sold 8,000 shares at $10.03 (≈$80.24K) on Aug 24, 2026
- Stepien Thomas M sold 23,529 shares at $10.34 (≈$243.29K) on Aug 21, 2026
- Stepien Thomas M sold 23,529 shares at $10.34 (≈$243.29K) on Aug 21, 2026
- …plus 2 more transaction lines in the filing.
Open-market purchases (P) and sales (S) are shown in colour; awards, exercises and tax withholding are routine pay-related moves. Many sales are pre-planned under 10b5-1 plans.
Aug 25, 2026 · Form 144 — Planned insider sale
Notice of proposed sale (Form 144) — an insider or affiliate plans to sell restricted or control shares
A notice of intent, not a completed sale. Any actual sale by a director or officer shows up later on Form 4.
Aug 13, 2026 · Form 8-K — Major event / current report
Current report — a filing companies must make within 4 business days of a major event
- Item 1.01 — Signed a material agreement.
- Item 2.03 — Took on a new material debt or financial obligation.
Aug 10, 2026 · Form SCHEDULE 13G/A — Update to a passive 5%+ stake (13G)
Update to a passive 5%+ stake (13G)
Filed by an outside investor (not the company). It reports a holding of more than 5% of a share class; percentage and holder name are in the filing.
Aug 6, 2026 · Form 10-Q — Quarterly report
Quarterly report (unaudited financial statements for the quarter)
Quarter ended Jun 30, 2026:
- Revenue: $34.03M (prior year $15.07M) (+125.9% vs Jun 30, 2025)
- Net income: -$3.15M (prior year -$6.37M) (loss narrowed vs Jun 30, 2025)
- Diluted EPS: -$0.04 (prior year -$0.05) (loss narrowed vs Jun 30, 2025)
Aug 4, 2026 · Form 8-K — Major event / current report
Current report — a filing companies must make within 4 business days of a major event
- Item 2.02 — Reported results of operations (earnings release).
This is a results-day filing: the earnings press release is attached as an exhibit.
Jul 27, 2026 · Form SCHEDULE 13G/A — Update to a passive 5%+ stake (13G)
Update to a passive 5%+ stake (13G)
Filed by an outside investor (not the company). It reports a holding of more than 5% of a share class; percentage and holder name are in the filing.
Things to know before you trade AMPX-WT
- Last results release: Aug 4, 2026 (8-K Item 2.02). Previous ones: May 6, 2026, Mar 4, 2026, Nov 6, 2025. Based on that rhythm, the next report is likely around Nov 3, 2026 — an estimate, not a confirmed date.
- How much it moves: over the last 20 sessions the average daily move was 0.57% (largest 0.6%). That is a relatively calm stock.
- Liquidity: about 3.29K shares (≈$5.82K) trade per day on average. Thin volume can mean wider bid/ask spreads.
- 52-week position: $1.77 vs a range of $1.74–$1.90 (18% of the range).
- Dividends: no cash dividends in the last 2 years.
- Splits: none in the last 2 years.
- Insider trades (Form 4, last 12 months, recent 25 shown): 0 open-market buys, 25 sales; latest: Thomas M Stepien sold 8,000 shares on Aug 24, 2026.
- Latest filings: 8-K Sep 28, 2026; 8-K Aug 13, 2026; 10-Q Aug 6, 2026.
- Share count: 146.08M shares outstanding (Jul 31, 2026), +16.8% vs a year earlier — notable dilution.
- Listing: NYSE · industry: Miscellaneous Electrical Machinery, Equipment & Supplies.
AMPX-WT market data (last 20 sessions)
| Date | Open | High | Low | Close | Volume |
|---|---|---|---|---|---|
| Oct 20, 2026 | 0.00 | 1.82 | 1.74 | 1.77 | 3.33K |
| Oct 19, 2026 | 0.00 | 1.90 | 1.78 | 1.78 | 3.25K |
About Amprius Technologies
Amprius Technologies (AMPX-WT) is listed on the NYSE and classified by the SEC under “Miscellaneous Electrical Machinery, Equipment & Supplies”. Its business address is in FREMONT, CA. State of incorporation: DE. Fiscal year ends December 31. SEC CIK 1899287.
AMPX-WT board of directors & executives
From SEC Form 3/4/5 insider filings made in the last 12 months (date = latest filing).
Directors
| Name | Role | Latest filing |
|---|---|---|
| Kathleen A Bayless | Director | Jun 16, 2026 |
| Steven Chu | Director | Jun 16, 2026 |
| Donald R Dixon | Director | Jun 16, 2026 |
| Wen Hsuan Hsieh | Director | Mar 13, 2026 |
| Livingston Satterthwaite | Director | Jun 16, 2026 |
| Thomas M Stepien | Chief Executive Officer | Aug 25, 2026 |
| Kang Sun | Director | Aug 25, 2026 |
Executive officers
| Name | Title | Latest filing |
|---|---|---|
| Ricardo C. Rodriguez | Chief Financial Officer | Mar 13, 2026 |
| Constantin Ionel Stefan | Chief Technology Officer | Aug 25, 2026 |
| Thomas M Stepien | Chief Executive Officer | Aug 25, 2026 |
Recent insider buys & sales
| Date | Insider | Type | Shares | Price |
|---|---|---|---|---|
| Aug 24, 2026 | Thomas M Stepien | Sale | 8,000 | $10.03 |
| Aug 24, 2026 | Thomas M Stepien | Sale | 8,000 | $10.03 |
| Aug 24, 2026 | Thomas M Stepien | Sale | 8,000 | $10.03 |
| Aug 24, 2026 | Thomas M Stepien | Sale | 8,000 | $10.03 |
| Aug 21, 2026 | Thomas M Stepien | Sale | 23,529 | $10.34 |
| Aug 21, 2026 | Thomas M Stepien | Sale | 23,529 | $10.34 |
| Aug 21, 2026 | Thomas M Stepien | Sale | 23,529 | $10.34 |
| Aug 21, 2026 | Thomas M Stepien | Sale | 23,529 | $10.34 |
| Aug 21, 2026 | Constantin Ionel Stefan | Sale | 29,681 | $10.34 |
| Aug 21, 2026 | Constantin Ionel Stefan | Sale | 29,681 | $10.34 |
| Aug 21, 2026 | Constantin Ionel Stefan | Sale | 29,681 | $10.34 |
| Aug 21, 2026 | Constantin Ionel Stefan | Sale | 29,681 | $10.34 |
| Aug 21, 2026 | Kang Sun | Sale | 62,101 | $10.34 |
| Aug 21, 2026 | Kang Sun | Sale | 62,101 | $10.34 |
| Aug 21, 2026 | Kang Sun | Sale | 62,101 | $10.34 |
AMPX-WT financials (annual, from XBRL filings)
| Fiscal year end | Revenue | Net income | Diluted EPS | Operating cash flow |
|---|---|---|---|---|
| Dec 31, 2025 | $71.91M | $-44.02M | -0.35 | $-31.13M |
| Dec 31, 2024 | $23.57M | $-44.67M | -0.45 | $-33.35M |
| Dec 31, 2023 | $8.79M | $-36.78M | -0.43 | $-25.55M |
| Dec 31, 2022 | — | $-17.33M | -0.24 | $-13.88M |
| Dec 31, 2021 | — | $-9.90M | -0.15 | $-8.02M |
Latest balance sheet: total assets $149.18M, total liabilities $23.55M, cash $74.52M (as of Jun 30, 2026).
AMPX-WT earnings / results-day log
| Date | Filing | Close that day |
|---|---|---|
| Aug 4, 2026 | 8-K Item 2.02 (results) | — |
| May 6, 2026 | 8-K Item 2.02 (results) | — |
| Mar 4, 2026 | 8-K Item 2.02 (results) | — |
| Nov 6, 2025 | 8-K Item 2.02 (results) | — |
| Aug 7, 2025 | 8-K Item 2.02 (results) | — |
| May 8, 2025 | 8-K Item 2.02 (results) | — |
| Mar 20, 2025 | 8-K Item 2.02 (results) | — |
| Mar 4, 2025 | 8-K Item 2.02 (results) | — |
| Nov 7, 2024 | 8-K Item 2.02 (results) | — |
| Oct 29, 2024 | 8-K Item 2.02 (results) | — |
| Aug 8, 2024 | 8-K Item 2.02 (results) | — |
| May 9, 2024 | 8-K Item 2.02 (results) | — |
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Information only, not investment advice. BuyMeWhiskey is not a registered investment adviser or broker-dealer; nothing here is a recommendation to buy, sell or hold any security, and there are no price targets. Data comes from SEC EDGAR filings and public end-of-day market data and may be delayed or contain errors. Verify with the company's filings before making decisions. Prices: intraday data as of Oct 20, 2026, 1:16 PM ET. Filings: SEC EDGAR. Refreshed every 2 hours during US market hours.