AMPX
insider transactionsAmprius Technologies, Inc. — buys & sells by directors, officers and 10% owners A shareholder owning more than 10% of the company. Must report trades, but usually a weaker signal than an officer or director. (SEC Form 4).
Net shares · 365d
-6.4M
0 buy · 6.4M sell
Net value · 365d
-$85.2M
$0 in · $85.2M out
Sentiment · 365d
Net selling
0% buying · 100% selling
Open-market trades · 365d
36
0 buy · 6.4M sell
Net buy / sell volume
Not enough data to chart yet.
Tap or hover the chart for daily net volume. Green = net buying, red = net selling.
Transactions · 365d
-
Sell·S
Director
$1.5M
85.0K sh · $17.17
Own -19%
-
Grant·A
Director
$0
10.4K sh
Own +3%
-
Grant·A
Director
$0
10.4K sh
Own +8%
-
Grant·A
Director
$0
10.4K sh
Own +5%
-
Grant·A
Director
$0
10.4K sh
Own +4%
-
Sell·S
Director
$765.2K
40.0K sh · $19.13
Own -8%
-
Sell·S
Stepien Thomas M KEY
Chief Executive Officer
$41.9K
2.0K sh · $20.97
Own -0%
-
Other·G
Stepien Thomas M KEY
Chief Executive Officer
$0
104.2K sh · 3 lots
Own -74%
-
Sell·S
Stepien Thomas M KEY
Chief Executive Officer
$75.2K
4.4K sh · $17.19
Own -1%
-
Sell·S
Chief Technology Officer
$55.2K
3.2K sh · $17.19
Own -0%
-
Sell·S
Director
$6.1K
356 sh · $17.19
Own -0%
-
Sell·S
Director
$320.3K
17.9K sh · $17.90
Own -4%
-
Sell·S
Stepien Thomas M KEY
Chief Executive Officer
$897.7K
60.7K sh · $14.79
Own -8%
-
Sell·S
Chief Technology Officer
$426.1K
28.8K sh · $14.79
Own -3%
-
Sell·S
Director
$1.0M
67.8K sh · $14.79
Own -5%
-
Grant·A
Director
$0
6.2K sh
Own +0%
-
Exercise·M
Director
$3.0M
1.5M sh · $2.02 avg · 2 lots
Own +523%
-
Sell·S
Director
$23.9M
1.5M sh · $15.91 avg · 2 lots
Own -53%
-
Exercise·M
Director
$3.0M
1.5M sh · $2.02 avg · 2 lots
Own +112%
-
Sell·S
Director
$4.1M
217.9K sh · $18.80 avg · 2 lots
Own -64%
-
Exercise·M
Director
$332.4K
259.7K sh · $1.28 avg · 3 lots
Own New
-
Sell·S
Director
$5.9M
322.2K sh · $18.20 avg · 4 lots
Own -72%
-
Exercise·M
Director
$332.4K
259.7K sh · $1.28 avg · 3 lots
Own +1119%
-
Exercise·M
Director
$705.4K
270.3K sh · $2.61
Own New
-
Sell·S
Director
$7.6M
413.1K sh · $18.45 avg · 2 lots
Own -90%
-
Exercise·M
Director
$705.4K
270.3K sh · $2.61
Own +144%
-
Grant·A
Chief Technology Officer
$0
110.0K sh
Own +15%
-
Grant·A
Stepien Thomas M KEY
Chief Executive Officer
$0
150.0K sh
Own +25%
-
Grant·A
Chief Financial Officer
$0
150.0K sh
Own +75%
-
Grant·A
Chief Financial Officer
$0
150.0K sh
Own +75%
-
Sell·S
Chief Technology Officer
$257.7K
25.4K sh · $10.16
Own -3%
-
Sell·S
Director
$622.3K
61.3K sh · $10.16
Own -4%
-
Exercise·M
Chief Technology Officer
$0
39.7K sh · 2 lots
Own New
-
Sell·S
Chief Technology Officer
$476.3K
39.7K sh · $12.00
Own -5%
-
Exercise·M
Chief Technology Officer
$2.0K
39.7K sh · $0.05 avg · 2 lots
Own +6%
-
Exercise·M
Chief Technology Officer
$0
567.7K sh · 7 lots
Own New
-
Sell·S
Chief Technology Officer
$6.8M
567.7K sh · $12.03 avg · 3 lots
Own -43%
-
Exercise·M
Chief Technology Officer
$81.2K
567.7K sh · $0.14 avg · 7 lots
Own +311%
-
Exercise·M
Director
$0
993.7K sh · 3 lots
Own +312%
-
Sell·S
Director
$11.0M
993.7K sh · $11.07 avg · 2 lots
Own -41%
-
Exercise·M
Director
$2.4M
993.7K sh · $2.40 avg · 3 lots
Own +219%
-
Exercise·M
Director
$0
506.3K sh · 3 lots
Own New
-
Exercise·M
Director
$913.3K
506.3K sh · $1.80 avg · 3 lots
Own +36%
-
Sell·S
Director
$5.1M
506.3K sh · $10.10
Own -27%
-
Grant·A
Stepien Thomas M KEY
Chief Executive Officer
$0
200.0K sh
Own +36%
-
Grant·A
Stepien Thomas M KEY
President
$0
200.0K sh
Own +49%
-
Exercise·M
Chief Technology Officer
$0
125.0K sh
Own +67%
-
Sell·S
Chief Technology Officer
$2.1M
198.3K sh · $10.51
Own -21%
-
Exercise·M
Chief Technology Officer
$6.2K
125.0K sh · $0.05
Own +15%
-
Sell·S
Sun Kang KEY
Chief Executive Officer
$692.0K
68.7K sh · $10.08
Own -5%
-
Sell·S
Chief Technology Officer
$252.2K
25.0K sh · $10.08
Own -3%
-
Exercise·M
Sun Kang KEY
Chief Executive Officer
$0
1.0M sh · 4 lots
Own New
-
Sell·S
Sun Kang KEY
Chief Executive Officer
$10.6M
1.0M sh · $10.60
Own -40%
-
Exercise·M
Sun Kang KEY
Chief Executive Officer
$278.1K
1.0M sh · $0.28 avg · 4 lots
Own +71%
-
Grant·A
Chief Financial Officer
$0
200.0K sh
Own New
-
Sell·S
Chief Technology Officer
$130.7K
19.2K sh · $6.82
Own -2%
-
Sell·S
Wallach Sandra KEY
Chief Financial Officer
$193.6K
28.4K sh · $6.82
Own -3%
-
Sell·S
Sun Kang KEY
Chief Executive Officer
$447.8K
65.7K sh · $6.82
Own -4%
| Date▾ | Insider | Type | Shares | Value |
|---|---|---|---|---|
| Jun 15, 2026 | DIXON DONALD R | Sell S | 85.0K | $1.5M |
| Jun 12, 2026 | SATTERTHWAITE LIVINGSTON | Grant A | 10.4K | $0 |
| Jun 12, 2026 | Chu Steven | Grant A | 10.4K | $0 |
| Jun 12, 2026 | BAYLESS KATHLEEN A | Grant A | 10.4K | $0 |
| Jun 12, 2026 | DIXON DONALD R | Grant A | 10.4K | $0 |
| Jun 9, 2026 | DIXON DONALD R | Sell S | 40.0K | $765.2K |
| Jun 4, 2026 | Stepien Thomas M KEY | Sell S | 2.0K | $41.9K |
| Jun 4, 2026 | Stepien Thomas M KEY | Other G | 104.2K3 lots | $0 |
| May 27, 2026 | Stepien Thomas M KEY | Sell S | 4.4K | $75.2K |
| May 27, 2026 | Stefan Constantin Ionel | Sell S | 3.2K | $55.2K |
| May 27, 2026 | Sun Kang | Sell S | 356 | $6.1K |
| May 26, 2026 | DIXON DONALD R | Sell S | 17.9K | $320.3K |
| May 21, 2026 | Stepien Thomas M KEY | Sell S | 60.7K | $897.7K |
| May 21, 2026 | Stefan Constantin Ionel | Sell S | 28.8K | $426.1K |
| May 21, 2026 | Sun Kang | Sell S | 67.8K | $1.0M |
| May 5, 2026 | Sun Kang | Grant A | 6.2K | $0 |
| Apr 1, 2026 | Sun Kang | Exercise M | 1.5M2 lots | $3.0M |
| Apr 1, 2026 | Sun Kang | Sell S | 1.5M2 lots | $23.9M |
| Apr 1, 2026 | Sun Kang | Exercise M | 1.5M2 lots | $3.0M |
| Mar 23, 2026 | Sun Kang | Sell S | 217.9K2 lots | $4.1M |
| Mar 12, 2026 | Chu Steven | Exercise M | 259.7K3 lots | $332.4K |
| Mar 12, 2026 | Chu Steven | Sell S | 322.2K4 lots | $5.9M |
| Mar 12, 2026 | Chu Steven | Exercise M | 259.7K3 lots | $332.4K |
| Mar 12, 2026 | HSIEH Wen Hsuan | Exercise M | 270.3K | $705.4K |
| Mar 12, 2026 | HSIEH Wen Hsuan | Sell S | 413.1K2 lots | $7.6M |
| Mar 12, 2026 | HSIEH Wen Hsuan | Exercise M | 270.3K | $705.4K |
| Mar 4, 2026 | Stefan Constantin Ionel | Grant A | 110.0K | $0 |
| Mar 4, 2026 | Stepien Thomas M KEY | Grant A | 150.0K | $0 |
| Mar 4, 2026 | RODRIGUEZ RICARDO C. KEY | Grant A | 150.0K | $0 |
| Mar 4, 2026 | RODRIGUEZ RICARDO C. KEY | Grant A | 150.0K | $0 |
| Feb 23, 2026 | Stefan Constantin Ionel | Sell S | 25.4K | $257.7K |
| Feb 23, 2026 | Sun Kang | Sell S | 61.3K | $622.3K |
| Jan 28, 2026 | Stefan Constantin Ionel | Exercise M | 39.7K2 lots | $0 |
| Jan 28, 2026 | Stefan Constantin Ionel | Sell S | 39.7K | $476.3K |
| Jan 28, 2026 | Stefan Constantin Ionel | Exercise M | 39.7K2 lots | $2.0K |
| Jan 23, 2026 | Stefan Constantin Ionel | Exercise M | 567.7K7 lots | $0 |
| Jan 23, 2026 | Stefan Constantin Ionel | Sell S | 567.7K3 lots | $6.8M |
| Jan 23, 2026 | Stefan Constantin Ionel | Exercise M | 567.7K7 lots | $81.2K |
| Jan 20, 2026 | Sun Kang | Exercise M | 993.7K3 lots | $0 |
| Jan 20, 2026 | Sun Kang | Sell S | 993.7K2 lots | $11.0M |
| Jan 20, 2026 | Sun Kang | Exercise M | 993.7K3 lots | $2.4M |
| Jan 12, 2026 | Sun Kang | Exercise M | 506.3K3 lots | $0 |
| Jan 12, 2026 | Sun Kang | Exercise M | 506.3K3 lots | $913.3K |
| Jan 12, 2026 | Sun Kang | Sell S | 506.3K | $5.1M |
| Dec 19, 2025 | Stepien Thomas M KEY | Grant A | 200.0K | $0 |
| Dec 19, 2025 | Stepien Thomas M KEY | Grant A | 200.0K | $0 |
| Dec 11, 2025 | Stefan Constantin Ionel | Exercise M | 125.0K | $0 |
| Dec 11, 2025 | Stefan Constantin Ionel | Sell S | 198.3K | $2.1M |
| Dec 11, 2025 | Stefan Constantin Ionel | Exercise M | 125.0K | $6.2K |
| Nov 21, 2025 | Sun Kang KEY | Sell S | 68.7K | $692.0K |
| Nov 21, 2025 | Stefan Constantin Ionel | Sell S | 25.0K | $252.2K |
| Nov 17, 2025 | Sun Kang KEY | Exercise M | 1.0M4 lots | $0 |
| Nov 17, 2025 | Sun Kang KEY | Sell S | 1.0M | $10.6M |
| Nov 17, 2025 | Sun Kang KEY | Exercise M | 1.0M4 lots | $278.1K |
| Oct 6, 2025 | RODRIGUEZ RICARDO C. KEY | Grant A | 200.0K | $0 |
| Aug 21, 2025 | Stefan Constantin Ionel | Sell S | 19.2K | $130.7K |
| Aug 21, 2025 | Wallach Sandra KEY | Sell S | 28.4K | $193.6K |
| Aug 21, 2025 | Sun Kang KEY | Sell S | 65.7K | $447.8K |
Buy Sell Non-market (grant · exercise · gift)
About AMPX insider trading
This page tracks insider transactions for Amprius Technologies, Inc. (AMPX) reported to the U.S. Securities and Exchange Commission on Form 4. Corporate insiders — directors, executive officers and beneficial owners of more than 10% of the stock — must disclose their trades within two business days. Open-market purchases (code P) and sales (code S) made at the insider's discretion are the most-watched opportunistic signals, while awards (A), option exercises (M) and tax-withholding (F) reflect compensation rather than conviction. Trades marked 10b5-1 were made under a pre-arranged plan and are considered routine. A cluster buy — several insiders buying within a short window — is historically a stronger bullish indicator than any single trade.