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Amprius Technologies, Inc. (New York Stock Exchange:AMPX)
US · Delayed Price · Currency is USD
Industrials · Electrical Equipment & Parts
8.35+0.17 (+2.08%)
Insider Score
––Not scored
AMPX Insider Score
Insiders filed in the last 90 days, but none of those trades qualified for scoring — round-trip buys and filings whose price is far off the market are excluded.
AMPX Stock Insider Trading Activity
AMPX stock’s insider trading shows 14 sales on the open market for an estimated $6.32M by company insiders over the last 6 months.
Not enough price history.
Insider Trading Activity (Form 4 Filings)
An insider trade occurs when an individual that has non-public information about a company buys or sells shares of that company’s stock. Examples of insiders include a company’s executive officers (CEO, CFO, COO), its board of directors, and its major shareholders. Insiders are required to submit their trading activity to the SEC through Form 4 filings.
Scored window · last 90 days0 qualifying buys0 insiders$0 bought— these are the numbers in the rankings table; the full history below shows every filing (buys, sells and older activity).
| Insider | Action | Shares | Avg Cost | Total | Δ Holdings | Held After | Date | Grade | Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| Stepien Thomas M CEO | Gift | 5,000 | — | — | 0.8% | 589,096 | Aug 25, 2026 | — | Form 4 |
| Stepien Thomas M CEO | Gift | 5,000 | — | — | 0.8% | 584,096 | Aug 25, 2026 | — | Form 4 |
| Stepien Thomas M CEO | Gift | 5,000 | — | — | 0.9% | 579,096 | Aug 25, 2026 | — | Form 4 |
| Stepien Thomas M CEO | Gift | 346 | — | — | 0.1% | 578,750 | Aug 25, 2026 | — | Form 4 |
| Stepien Thomas M CEO | Award | 346 | — | — | 0.9% | 37,260 | Aug 25, 2026 | — | Form 4 |
| Stepien Thomas M CEO | Sell | 8,000 | $10.03 | $80.24K | 1.3% | 594,096 | Aug 24, 2026 | — | Form 4 |
| Sun Kang Director | Sell | 62,101 | $10.34 | $642.19K | 4.8% | 1,218,397 | Aug 21, 2026 | — | Form 4 |
| Stepien Thomas M CEO | Sell | 23,529 | $10.34 | $243.31K | 3.8% | 602,096 | Aug 21, 2026 | — | Form 4 |
| Stefan Constantin Ionel Other | Sell | 29,681 | $10.34 | $306.93K | 3.7% | 771,629 | Aug 21, 2026 | — | Form 4 |
| DIXON DONALD R Director | Sell | 85,000 | $17.17 | $1.46M | 19.1% | 359,380 | Jun 15, 2026 | — | Form 4 |
| BAYLESS KATHLEEN A Director | Award | 10,423 | — | — | 5.1% | 216,120 | Jun 12, 2026 | — | Form 4 |
| SATTERTHWAITE LIVINGSTON Director | Award | 10,423 | — | — | 3.1% | 346,506 | Jun 12, 2026 | — | Form 4 |
| DIXON DONALD R Director | Award | 10,423 | — | — | 3.9% | 280,079 | Jun 12, 2026 | — | Form 4 |
| Chu Steven Director | Award | 10,423 | — | — | 8.2% | 137,762 | Jun 12, 2026 | — | Form 4 |
| DIXON DONALD R Director | Sell | 40,000 | $19.13 | $765.20K | 8.3% | 444,380 | Jun 9, 2026 | — | Form 4 |
| Stepien Thomas M CEO | Gift | 30,384 | — | — | 4.4% | 664,539 | Jun 4, 2026 | — | Form 4 |
| Stepien Thomas M CEO | Gift | 36,914 | — | — | 5.6% | 627,625 | Jun 4, 2026 | — | Form 4 |
| Stepien Thomas M CEO | Gift | 36,914 | — | — | New | 36,914 | Jun 4, 2026 | — | Form 4 |
| Stepien Thomas M CEO | Sell | 2,000 | $20.97 | $41.94K | 0.3% | 625,625 | Jun 4, 2026 | — | Form 4 |
| Stefan Constantin Ionel Other | Sell | 3,208 | $17.19 | $55.16K | 0.4% | 801,310 | May 27, 2026 | — | Form 4 |
| Sun Kang Director | Sell | 356 | $17.19 | $6.12K | 0.0% | 1,280,498 | May 27, 2026 | — | Form 4 |
| Stepien Thomas M CEO | Sell | 4,375 | $17.19 | $75.22K | 0.6% | 694,923 | May 27, 2026 | — | Form 4 |
| DIXON DONALD R Director | Sell | 17,895 | $17.90 | $320.25K | 3.6% | 484,380 | May 26, 2026 | — | Form 4 |
| Sun Kang Director | Sell | 67,796 | $14.79 | $1.00M | 5.0% | 1,280,854 | May 21, 2026 | — | Form 4 |
| Stefan Constantin Ionel Other | Sell | 28,812 | $14.79 | $426.08K | 3.5% | 804,518 | May 21, 2026 | — | Form 4 |
| Stepien Thomas M CEO | Sell | 60,702 | $14.79 | $897.69K | 8.0% | 699,298 | May 21, 2026 | — | Form 4 |
| Sun Kang Director | Award | 6,250 | — | — | 0.5% | 1,348,650 | May 5, 2026 | — | Form 4 |
What these mean— the action is the SEC’s own Form 4 transaction code. Only a buy or a sell is an open-market trade; the rest are transfers, awards and exercises, which is why they carry no price.
- Sell (S) — Open-market or private sale
- Award (A) — Grant or award from the company, not a purchase
- Gift (G) — Bona fide gift
Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.