Constantin Ionel Stefan

AMPX

Constantin Ionel Stefan serves as officer: Chief Technology Officer at Amprius Technologies, Inc. (AMPX). This page tracks their complete SEC Form 4 insider trading history including stock purchases and sales.

Total Buys

0 trades

$0.00

Total Sells

18 trades

$18.52M

Net Position

Net Seller

$18.52M

Companies Traded

AMPX

Active Period

Dec 2022 – Aug 2026

18 total trades

Most Recent

Sell AMPX

Aug 25, 2026 · $306.9K

Constantin Ionel Stefan's Insider Trading at Amprius Technologies, Inc. (AMPX)

Buys

0 · $0.00

Sells

18 · $18.52M

Total Shares Bought

Total Shares Sold

1,679,108

AMPX Price Chart

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Date	Type	Shares	Avg Price	Value	Shares After
Aug 25, 2026	Sell	29,681	$10.34	$306.9K	771,629
May 28, 2026	Sell	3,208	$17.19	$55.2K	801,310
May 26, 2026	Sell	28,812	$14.79	$426.1K	804,518
Feb 24, 2026	Sell	25,366	$10.16	$257.6K	723,330
Jan 30, 2026	Sell	39,690	$12.00	$476.4K	748,696
Jan 28, 2026	Sell	39,690	$12.00	$476.4K	0
Jan 23, 2026	Sell	566,107	$12.03	$6.81M	748,696
Jan 21, 2026	Sell	567,707	$12.03	$6.83M	0
Dec 11, 2025	Sell	198,255	$10.51	$2.08M	0
Nov 21, 2025	Sell	25,024	$10.08	$252.3K	0
Aug 21, 2025	Sell	19,159	$6.82	$130.6K	0
May 21, 2025	Sell	20,366	$2.43	$49.5K	0
Feb 21, 2025	Sell	9,066	$3.13	$28.4K	0
Nov 21, 2024	Sell	8,575	$1.96	$16.8K	0
Aug 21, 2024	Sell	8,800	$1.04	$9.2K	0
May 21, 2024	Sell	9,393	$1.34	$12.6K	0
Sep 14, 2023	Sell	80,000	$3.75	$300.2K	0
Dec 14, 2022	Sell	209	$7.20	$1.5K	0