Constantin Ionel Stefan
Chief Technology Officer · 7 filings · Latest: Aug 21, 2026
Amprius Technologies, Inc.
| Ticker | Owner | Relationship | Date | Transaction | Cost | #Shares | Value ($) | #Shares Total | SEC Filing |
|---|---|---|---|---|---|---|---|---|---|
AMPX | Constantin Ionel Stefan | Chief Technology Officer | Aug 21, 2026 | Sale | $10.34 | 29,681 | $306.9K | 771,629 | |
AMPX | Constantin Ionel Stefan | — | Aug 21, 2026 | Proposed Sale | $10.34 | 29,681 | $306.9K | — | |
AMPX | Constantin Ionel Stefan | Chief Technology Officer | May 27, 2026 | Sale | $17.19 | 3,208 | $55.2K | 801,310 | |
AMPX | Constantin Ionel Stefan | — | May 27, 2026 | Proposed Sale | $17.19 | 3,208 | $55.2K | — | |
AMPX | Constantin Ionel Stefan | Chief Technology Officer | May 21, 2026 | Sale | $14.79 | 28,812 | $426.1K | 804,518 | |
AMPX | Stefan Constantin Ionel | — | May 21, 2026 | Proposed Sale | $14.79 | 28,812 | $426.1K | — | |
AMPX | Constantin Ionel Stefan | Chief Technology Officer | Feb 23, 2026 | Sale | $10.16 | 25,366 | $257.6K | 723,330 | |
AMPX | Stefan Constantin Ionel | — | Feb 23, 2026 | Proposed Sale | $10.16 | 25,366 | $257.7K | — | |
AMPX | Constantin Ionel Stefan | Chief Technology Officer | Jan 28, 2026 | Sale | $12.00 | 39,690 | $476.4K | 748,696 | |
AMPX | Constantin Ionel Stefan | Chief Technology Officer | Jan 28, 2026 | Option Exercise | $0.0513 | 39,690 | $2.0K | 788,386 | |
AMPX | Constantin Ionel Stefan | Chief Technology Officer | Jan 23, 2026 | Sale | $12.00 | 1,600 | $19.2K | 748,696 | |
AMPX | Constantin Ionel Stefan | Chief Technology Officer | Jan 23, 2026 | Option Exercise | $0.05 | 1,600 | $80 | 750,296 | |
AMPX | Constantin Ionel Stefan | Chief Technology Officer | Jan 22, 2026 | Sale | $12.04 | 492,827 | $5.9M | 748,696 | |
AMPX | Constantin Ionel Stefan | Chief Technology Officer | Jan 22, 2026 | Option Exercise | $0.1091 | 492,827 | $53.8K | 1,241,523 | |
AMPX | Constantin Ionel Stefan | Chief Technology Officer | Jan 21, 2026 | Sale | $12.00 | 73,280 | $879.4K | 748,696 | |
AMPX | Constantin Ionel Stefan | Chief Technology Officer | Jan 21, 2026 | Option Exercise | $0.3733 | 73,280 | $27.4K | 821,976 | |
AMPX | Stefan Constantin Ionel | — | Jan 21, 2026 | Proposed Sale | $11.17 | 717,307 | $8.0M | — | |
AMPX | Stefan Constantin Ionel | — | Dec 11, 2025 | Proposed Sale | $11.04 | 198,255 | $2.2M | — | |
AMPX | Stefan Constantin Ionel | — | Nov 21, 2025 | Proposed Sale | $10.08 | 25,024 | $252.3K | — | |
AMPX | Stefan Constantin Ionel | — | Aug 21, 2025 | Proposed Sale | $6.82 | 19,159 | $130.6K | — |
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