AMPX — Amprius Technologies, Inc.
Price · 2024-08-26 → 2026-08-21
499 daily closes shownAnonymous view is capped at two years of history. A free account extends it to five, and Pro opens the whole archive back to 2022-09-15.
Performance
Technicals
Others in Technology
Measured signals that fired on AMPX
| date | signal | measured base rate |
|---|---|---|
| 2026-08-18 | Fair value gap, bearish structure | -0.45% over 21 days · t = -3.29 · n = 108,591 statistically distinguishable from its control group |
| 2026-08-04 | Fair value gap, bullish structure | -0.67% over 21 days · t = -6.43 · n = 111,973 statistically distinguishable from its control group |
| 2026-06-24 | Fair value gap, bearish structure | -0.45% over 21 days · t = -3.29 · n = 108,591 statistically distinguishable from its control group |
| 2026-05-26 | Cluster sale: three or more insiders insider | -0.37% over 21 days · t = -3.38 · n = 21,542 statistically distinguishable from its control group |
| 2026-05-26 | Fair value gap, bullish structure | -0.67% over 21 days · t = -6.43 · n = 111,973 statistically distinguishable from its control group |
| 2026-05-07 | Fair value gap, bearish structure | -0.45% over 21 days · t = -3.29 · n = 108,591 statistically distinguishable from its control group |
Excess return against a matched control group, on a point-in-time universe that includes delisted companies. Most families do not survive that. How the measurement works →
Insider transactions (Form 4)
| date | insider | what | shares | price | value |
|---|---|---|---|---|---|
| 2026-06-15 | DIXON DONALD R Director | Open-market sale | 85.0K | 17.17 | 1.5M |
| 2026-06-12 | DIXON DONALD R Director | Grant or award | 10.4K | 0.00 | 0 |
| 2026-06-12 | SATTERTHWAITE LIVINGSTON Director | Grant or award | 10.4K | 0.00 | 0 |
| 2026-06-12 | Chu Steven Director | Grant or award | 10.4K | 0.00 | 0 |
| 2026-06-12 | BAYLESS KATHLEEN A Director | Grant or award | 10.4K | 0.00 | 0 |
| 2026-06-09 | DIXON DONALD R Director | Open-market sale | 40.0K | 19.13 | 765.2K |
| 2026-06-04 | Stepien Thomas M Chief Executive Officer | Open-market sale | 2.0K | 20.97 | 41.9K |
| 2026-06-04 | Stepien Thomas M Chief Executive Officer | Gift | 36.9K | 0.00 | 0 |
| 2026-06-04 | Stepien Thomas M Chief Executive Officer | Gift | 36.9K | 0.00 | 0 |
| 2026-06-04 | Stepien Thomas M Chief Executive Officer | Gift | 30.4K | 0.00 | 0 |
Open-market purchases (code P) are the informative ones. Grants, option exercises and tax withholding are compensation mechanics, not decisions. How to read a Form 4 →
Largest institutional holders
| manager | value | shares |
|---|---|---|
| BlackRock, Inc. | 155.5M | 9.2M |
| VANGUARD CAPITAL MANAGEMENT LLC | 82.8M | 4.9M |
| JANE STREET GROUP, LLC | 70.1M | 4.2M |
| Driehaus Capital Management LLC | 64.0M | 3.8M |
| TWO SIGMA INVESTMENTS, LP | 59.1M | 3.5M |
| MORGAN STANLEY | 53.3M | 3.2M |
| GEODE CAPITAL MANAGEMENT, LLC | 47.5M | 2.8M |
| STATE STREET CORP | 45.7M | 2.7M |
| UBS Group AG | 39.0M | 2.3M |
| GOLDMAN SACHS GROUP INC | 37.5M | 2.2M |
13F positions as of 2026-03-31, filed up to 45 days after quarter end. Long-only US equity — shorts and derivatives never appear. What 13F does and does not show →
Short selling
This is off-exchange short volume, not short interest: it is flow, not position, and 40–50% is normal because market makers short to fill your buy. Why that number misleads →
Recent headlines
- Amprius Technologies, Inc. (AMPX) filed form 8-K · 2026-08-13 · SEC EDGAR
- Amprius Technologies (AMPX) Is Up 23.4% After Raising 2026 Guidance Amid Improving Manufacturing Economics - simplywall.st · 2026-08-09 · simplywall.st
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