Stefan Constantin Ionel, Chief Technology Officer at Amprius Technologies ($AMPX), sold common shares on the open market nine times over the last year, totaling about $10.1 million. His most recent sale occurred on February 23, 2026. These transactions rank 1,115th among 11,678 insiders in our database, surpassing the average sale value of $8.6 million and 6.4 transactions per insider. He made no open market purchases in this period.
| Transaction Date | Company | Ticker | Insider Name | Title | Transaction Type | Security | Shares | Price | Shares Owned Following | Total Shares Outstanding | % of Owned | % of Outstanding |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| March 4, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | A | Common stock | 110000 | $0.00 | 833,330.0000 | 130,483,838 | 15.21% | 0.08% |
| Feb. 23, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | S | Common stock | 25366 | $10.16 | 723,330.0000 | 130,483,838 | 3.39% | 0.02% |
| Jan. 28, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Stock Option (right to buy) | 90 | $0.00 | 0.0000 | 130,483,838 | 100.00% | 0.00% |
| Jan. 28, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | S | Common stock | 39690 | $12.00 | 748,696.0000 | 130,483,838 | 5.03% | 0.03% |
| Jan. 28, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Common stock | 39600 | $0.05 | 788,386.0000 | 130,483,838 | 5.29% | 0.03% |
| Jan. 28, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Stock Option (right to buy) | 39600 | $0.00 | 0.0000 | 130,483,838 | 100.00% | 0.03% |
| Jan. 28, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Common stock | 90 | $0.62 | 748,786.0000 | 130,483,838 | 0.01% | 0.00% |
| Jan. 23, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Common stock | 1600 | $0.05 | 750,296.0000 | 130,483,838 | 0.21% | 0.00% |
| Jan. 21, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Common stock | 41563 | $0.62 | 790,259.0000 | 130,483,838 | 5.55% | 0.03% |
| Jan. 21, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Common stock | 15834 | $0.05 | 806,093.0000 | 130,483,838 | 2.00% | 0.01% |
| Jan. 21, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Common stock | 15883 | $0.05 | 821,976.0000 | 130,483,838 | 1.97% | 0.01% |
| Jan. 21, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | S | Common stock | 73280 | $12.00 | 748,696.0000 | 130,483,838 | 8.92% | 0.06% |
| Jan. 22, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Common stock | 253928 | $0.05 | 1,002,624.0000 | 130,483,838 | 33.92% | 0.19% |
| Jan. 22, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Common stock | 72795 | $0.45 | 1,075,419.0000 | 130,483,838 | 7.26% | 0.06% |
| Jan. 22, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Common stock | 166104 | $0.05 | 1,241,523.0000 | 130,483,838 | 15.45% | 0.13% |
| Jan. 22, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | S | Common stock | 492827 | $12.04 | 748,696.0000 | 130,483,838 | 39.70% | 0.38% |
| Jan. 23, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | S | Common stock | 1600 | $12.00 | 748,696.0000 | 130,483,838 | 0.21% | 0.00% |
| Jan. 21, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Stock Option (right to buy) | 41563 | $0.00 | 90.0000 | 130,483,838 | 99.78% | 0.03% |
| Jan. 21, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Stock Option (right to buy) | 15834 | $0.00 | 295,128.0000 | 130,483,838 | 5.09% | 0.01% |
| Jan. 21, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Stock Option (right to buy) | 15883 | $0.00 | 166,104.0000 | 130,483,838 | 8.73% | 0.01% |
| Jan. 22, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Stock Option (right to buy) | 253928 | $0.00 | 41,200.0000 | 130,483,838 | 86.04% | 0.19% |
| Jan. 22, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Stock Option (right to buy) | 72795 | $0.00 | 0.0000 | 130,483,838 | 100.00% | 0.06% |
| Jan. 22, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Stock Option (right to buy) | 166104 | $0.00 | 0.0000 | 130,483,838 | 100.00% | 0.13% |
| Jan. 23, 2026 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Stock Option (right to buy) | 1600 | $0.00 | 39,600.0000 | 130,483,838 | 3.88% | 0.00% |
| Dec. 11, 2025 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | S | Common stock | 198255 | $10.51 | 748,696.0000 | 130,483,838 | 20.94% | 0.15% |
| Dec. 11, 2025 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Common stock | 125000 | $0.05 | 946,951.0000 | 130,483,838 | 15.21% | 0.10% |
| Dec. 11, 2025 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Stock Option (right to buy) | 125000 | $0.00 | 310,962.0000 | 130,483,838 | 28.67% | 0.10% |
| Nov. 21, 2025 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | S | Common stock | 25024 | $10.08 | 821,951.0000 | 130,483,838 | 2.95% | 0.02% |
| Aug. 21, 2025 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | S | Common stock | 19159 | $6.82 | 846,975.0000 | 117,926,808 | 2.21% | 0.02% |
| May 21, 2025 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | S | Common stock | 20366 | $2.43 | 866,134.0000 | 117,926,808 | 2.30% | 0.02% |
| March 19, 2025 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | A | Common stock | 461540 | $0.00 | 886,500.0000 | 117,926,808 | 108.61% | 0.39% |
| March 14, 2025 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Stock Option (right to buy) | 3471 | $0.00 | 0.0000 | 117,926,808 | 100.00% | 0.00% |
| March 14, 2025 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | M | Common stock | 3471 | $0.98 | 424,960.0000 | 117,926,808 | 0.82% | 0.00% |
| Feb. 21, 2025 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | S | Common stock | 9066 | $3.13 | 421,489.0000 | 0 | 2.11% | 0.00% |
| Nov. 21, 2024 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | S | Common stock | 8575 | $1.96 | 430,555.0000 | 0 | 1.95% | 0.00% |
| Oct. 23, 2024 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | A | Stock Option (right to buy) | 139613 | $0.00 | 139,613.0000 | 0 | 9999.99% | 0.00% |
| Oct. 23, 2024 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | A | Stock Option (right to buy) | 41653 | $0.00 | 41,653.0000 | 0 | 9999.99% | 0.00% |
| Oct. 23, 2024 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | A | Stock Option (right to buy) | 3471 | $0.00 | 3,471.0000 | 0 | 9999.99% | 0.00% |
| Aug. 21, 2024 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | S | Common stock | 8800 | $1.04 | 386,168.0000 | 0 | 2.23% | 0.00% |
| May 21, 2024 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | S | Common stock | 5272 | $1.33 | 399,089.0000 | 0 | 1.30% | 0.00% |
| May 22, 2024 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | S | Common stock | 4121 | $1.36 | 394,968.0000 | 0 | 1.03% | 0.00% |
| March 19, 2024 | Amprius Technologies, Inc. | $AMPX | Stefan Constantin Ionel | Chief Technology Officer | A | Common stock | 374570 | $0.00 | 404,361.0000 | 0 | 1257.33% | 0.00% |