InsiderTrades

Stefan Constantin Ionel

SEC CIK 1940928 · EDGAR

Buying vs selling by month open-market trades, last 37 months, AMPX
BoughtSold

Companies

TickerCompanyTitleHoldingBoughtSoldTradesFirstLast
AMPXAmprius Technologies, Inc.CTO 771.6K — $11.24M 252022-12-142026-08-21

Most active insiders at AMPX, 12 months

#InsiderTitleBoughtSold
1 Sun KangDir —$57.63M
2 Stefan Constantin IonelCTO —$10.69M
3 HSIEH Wen HsuanDir —$7.62M
4 Chu StevenDir —$5.86M
5 DIXON DONALD RDir —$2.54M
6 Stepien Thomas MPres, Dir —$1.34M
7 RODRIGUEZ RICARDO C.CFO ——
8 SATTERTHWAITE LIVINGSTONDir ——
9 BAYLESS KATHLEEN ADir ——

Transactions 25

Type
Reset
X Filed Traded Ticker Company Insider Title Type Price Qty Owned ΔOwn Value
2026-08-25 17:22 2026-08-21 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO S - Sale $10.34 -29.7K 771.6K -4% -$306.9K
2026-05-28 18:12 2026-05-27 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO S - Sale $17.19 -3,208 801.3K -0.4% -$55.2K
2026-05-26 19:10 2026-05-21 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO S - Sale $14.79 -28.8K 804.5K -3% -$426.1K
2026-03-06 2026-03-04 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO A - Grant $0.00 +110.0K 833.3K +15% $0
2026-02-24 2026-02-23 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO S - Sale $10.16 -25.4K 723.3K -3% -$257.7K
DM 2026-01-30 2026-01-28 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO M - OptEx $0.0513 +39.7K 748.8K +6% +$2,036
D 2026-01-30 2026-01-28 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO S - Sale+OE $12.00 -39.7K 748.7K -5% -$476.3K
DM 2026-01-23 2026-01-21+ AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO S - Sale+OE $12.03 -567.7K 748.7K -43% -$6.83M
DM 2026-01-23 2026-01-21+ AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO M - OptEx $0.143 +567.7K 822.0K +223% +$81.2K
D 2025-12-15 2025-12-11 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO M - OptEx $0.05 +125.0K 947.0K +15% +$6,250
D 2025-12-15 2025-12-11 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO S - Sale+OE $10.51 -198.3K 748.7K -21% -$2.08M
2025-11-25 2025-11-21 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO S - Sale $10.08 -25.0K 822.0K -3% -$252.2K
2025-08-25 2025-08-21 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO S - Sale $6.82 -19.2K 847.0K -2% -$130.7K
2025-05-23 2025-05-21 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO S - Sale $2.43 -20.4K 866.1K -2% -$49.5K
2025-03-21 2025-03-19 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO A - Grant $0.00 +461.5K 886.5K +109% $0
D 2025-03-18 2025-03-14 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO M - OptEx $0.98 +3,471 425.0K +0.8% +$3,402
2025-02-24 2025-02-21 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO S - Sale $3.13 -9,066 421.5K -2% -$28.4K
2024-11-22 2024-11-21 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO S - Sale $1.96 -8,575 430.6K -2% -$16.8K
2024-08-22 2024-08-21 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO S - Sale $1.04 -8,800 386.2K -2% -$9,152
M 2024-05-24 2024-05-21+ AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO S - Sale $1.34 -9,393 399.1K -2% -$12.6K
2024-03-19 2024-03-19 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO A - Grant $0.00 +374.6K 404.4K +1,257% $0
M 2023-09-18 2023-09-14+ AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO S - Sale $3.76 -80.0K 29.8K -73% -$300.5K
D 2023-09-12 2023-09-09 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO M - OptEx $0.05 +80.0K 109.8K +269% +$4,000
2023-05-03 2022-12-14 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO F - Tax $7.20 -209 29.8K -0.7% -$1,505
D 2022-12-15 2022-12-14 AMPX Amprius Technologies, Inc. Stefan Constantin Ionel CTO M - OptEx $0.05 +30.0K 30.0K New +$1,500

Purchase Sale Sale after option exercise All abbreviations