Stocks
AMPX Amprius Technologies, Inc.

AMPX

Amprius Technologies, Inc.

Company with tickers: AMPX, AMPX-WT

CIK

1899287

CUSIP

03214Q108

Shares Outstanding

137,019,004

Price Holdings Short Volume Short Interest Fails to Deliver SEC Filings Earnings Calls Insider Trading Congress Trades

Date	Insider	Role	Type	Shares	Price	Value	After
2026-04-01	Sun Kang	Director	Convert	1,312,505	$1.78	$2,336,259	0
2026-04-01	Sun Kang	Director	Convert	1,312,505	$1.78	$2,336,259	2,654,905
2026-04-01	Sun Kang	Director	Other	56,406	—	—	56,406
2026-04-01	Sun Kang	Director	Sell	1,250,963	$15.73	$19,681,151	1,591,437
2026-03-23	Sun Kang	Director	Other	1,342,400	—	—	1,342,400
2026-03-23	Sun Kang	Director	Sell	152,823	$18.69	$2,855,696	121,452
2026-03-12	HSIEH Wen Hsuan	Director	Sell	282,500	$18.55	$5,239,245	175,090
2026-03-12	HSIEH Wen Hsuan	Director	Convert	270,251	$2.61	$705,355	0
2026-03-12	HSIEH Wen Hsuan	Director	Convert	270,251	$2.61	$705,355	457,590
2026-03-12	Chu Steven	Director	Convert	86,143	$2.61	$224,833	213,482
2026-03-12	Chu Steven	Director	Convert	86,143	$2.61	$224,833	184,108
2026-03-12	Chu Steven	Director	Sell	100,000	$18.65	$1,864,670	182,904
2026-03-10	Chu Steven	Director	Convert	104,132	$0.62	$64,562	293,971
2026-03-10	Chu Steven	Director	Sell	166,632	$17.92	$2,985,429	127,339
2026-03-10	Chu Steven	Director	Convert	104,132	$0.62	$64,562	69,422
2026-03-04	RODRIGUEZ RICARDO C.	Chief Financial Officer	Award	150,000	—	—	350,000
2026-03-04	Stepien Thomas M	Director, Chief Executive Officer	Award	150,000	—	—	760,000
2026-03-04	Stefan Constantin Ionel	Chief Technology Officer	Award	110,000	—	—	833,330
2026-02-23	Sun Kang	Director	Sell	61,251	$10.16	$622,035	1,342,400
2026-02-23	Sun Kang	Director	Other	274,275	—	—	274,275
2026-02-23	Stefan Constantin Ionel	Chief Technology Officer	Sell	25,366	$10.16	$257,604	723,330
2026-01-28	Stefan Constantin Ionel	Chief Technology Officer	Convert	90	—	—	0
2026-01-28	Stefan Constantin Ionel	Chief Technology Officer	Sell	39,690	$12.00	$476,351	748,696
2026-01-28	Stefan Constantin Ionel	Chief Technology Officer	Convert	90	$0.62	$56	748,786
2026-01-23	Stefan Constantin Ionel	Chief Technology Officer	Convert	1,600	$0.05	$80	750,296
2026-01-23	Stefan Constantin Ionel	Chief Technology Officer	Sell	1,600	$12.00	$19,200	748,696
2026-01-23	Stefan Constantin Ionel	Chief Technology Officer	Convert	1,600	—	—	39,600
2026-01-22	Stefan Constantin Ionel	Chief Technology Officer	Sell	492,827	$12.04	$5,931,912	748,696
2026-01-22	Stefan Constantin Ionel	Chief Technology Officer	Convert	253,928	—	—	41,200
2026-01-22	Stefan Constantin Ionel	Chief Technology Officer	Convert	253,928	$0.05	$12,696	1,002,624
2026-01-21	Stefan Constantin Ionel	Chief Technology Officer	Convert	41,563	$0.62	$25,769	790,259
2026-01-21	Stefan Constantin Ionel	Chief Technology Officer	Convert	41,563	—	—	90
2026-01-21	Stefan Constantin Ionel	Chief Technology Officer	Sell	73,280	$12.00	$879,411	748,696
2026-01-20	Sun Kang	Director	Convert	43,185	—	—	1,312,505
2026-01-20	Sun Kang	Director	Convert	43,185	$1.78	$76,869	1,446,836
2026-01-20	Sun Kang	Director	Sell	43,185	$11.03	$476,274	1,403,651
2026-01-16	Sun Kang	Director	Convert	850,338	—	—	0
2026-01-16	Sun Kang	Director	Other	274,275	—	—	274,275
2026-01-16	Sun Kang	Director	Convert	850,338	$2.50	$2,125,845	2,253,989
2026-01-16	Sun Kang	Director	Sell	950,548	$11.07	$10,518,669	1,403,651
2026-01-12	Sun Kang	Director	Convert	180,802	$0.62	$112,097	1,584,453
2026-01-12	Sun Kang	Director	Sell	506,267	$10.10	$5,111,474	1,403,651
2026-01-12	Sun Kang	Director	Convert	180,802	—	—	0
2026-01-12	Sun Kang	Director	Other	274,275	—	—	274,275
2025-12-19	Stepien Thomas M	Director, Chief Executive Officer	Award	200,000	—	—	610,000
2025-12-11	Stefan Constantin Ionel	Chief Technology Officer	Convert	125,000	—	—	310,962
2025-12-11	Stefan Constantin Ionel	Chief Technology Officer	Sell	198,255	$10.51	$2,083,382	748,696
2025-12-11	Stefan Constantin Ionel	Chief Technology Officer	Convert	125,000	$0.05	$6,250	946,951
2025-11-21	Stefan Constantin Ionel	Chief Technology Officer	Sell	25,024	$10.08	$252,274	821,951
2025-11-21	Sun Kang	Director	Other	274,275	—	—	274,275
2025-11-21	Sun Kang	Director	Sell	68,655	$10.08	$692,132	1,403,651
2025-11-17	Sun Kang	Director	Convert	202,934	—	—	0
2025-11-17	Sun Kang	Director	Other	274,275	—	—	274,275
2025-11-17	Sun Kang	Director	Convert	202,934	$0.98	$198,875	1,675,240
2025-11-17	Sun Kang	Director	Sell	1,000,000	$10.60	$10,595,300	1,472,306
2025-10-06	RODRIGUEZ RICARDO C.	Chief Financial Officer	Award	200,000	—	—	200,000
2025-10-06	RODRIGUEZ RICARDO C.	Chief Financial Officer	Other	0	—	—	0
2025-08-21	Stefan Constantin Ionel	Chief Technology Officer	Sell	19,159	$6.82	$130,592	846,975
2025-08-21	Wallach Sandra	Chief Financial Officer	Sell	28,390	$6.82	$193,512	1,005,275
2025-08-21	Sun Kang	Director	Sell	65,654	$6.82	$447,511	1,472,306
2025-08-21	Sun Kang	Director	Other	274,275	—	—	274,275
2025-06-13	BAYLESS KATHLEEN A	Director	Award	44,444	—	—	205,697
2025-06-13	HSIEH Wen Hsuan	Director	Award	44,444	—	—	187,339
2025-06-13	HSIEH Wen Hsuan	Director	Other	3,949,245	—	—	3,949,245
2025-06-13	DIXON DONALD R	Director	Award	44,444	—	—	394,656
2025-06-13	DIXON DONALD R	Director	Other	163,142	—	—	163,142
2025-06-13	SATTERTHWAITE LIVINGSTON	Director	Award	44,444	—	—	336,083
2025-06-13	Chu Steven	Director	Award	44,444	—	—	189,839
2025-05-21	Stefan Constantin Ionel	Chief Technology Officer	Sell	20,366	$2.43	$49,530	866,134
2025-05-21	Wallach Sandra	Chief Financial Officer	Sell	27,595	$2.43	$67,111	1,033,665
2025-05-21	Sun Kang	Director	Sell	69,786	$2.43	$169,720	1,812,235
2025-05-01	Stepien Thomas M	Director, Chief Executive Officer	Award	400,000	—	—	400,000
2025-05-01	Stepien Thomas M	Director, Chief Executive Officer	Other	0	—	—	0
2025-03-19	Sun Kang	Director	Award	599,400	—	—	1,882,021
2025-03-19	Wallach Sandra	Chief Financial Officer	Award	383,260	—	—	1,061,260
2025-03-19	Stefan Constantin Ionel	Chief Technology Officer	Award	461,540	—	—	886,500
2025-03-14	Stefan Constantin Ionel	Chief Technology Officer	Convert	3,471	—	—	0
2025-03-14	Stefan Constantin Ionel	Chief Technology Officer	Convert	3,471	$0.98	$3,402	424,960
2025-03-10	Bornstein Jonathan	President of Amprius Lab	Convert	3,471	—	—	0
2025-03-10	Bornstein Jonathan	President of Amprius Lab	Convert	3,471	$0.98	$3,402	422,668
2025-02-21	Sun Kang	Director	Sell	34,353	$3.13	$107,635	1,282,621
2025-02-21	Wallach Sandra	Chief Financial Officer	Sell	18,142	$3.13	$56,843	678,000
2025-02-21	Stefan Constantin Ionel	Chief Technology Officer	Sell	9,066	$3.13	$28,406	421,489
2025-02-21	Bornstein Jonathan	President of Amprius Lab	Other	1,062,357	—	—	1,062,357
2025-02-21	Bornstein Jonathan	President of Amprius Lab	Sell	13,527	$3.13	$42,383	419,197
2024-11-21	Sun Kang	Director	Sell	33,779	$1.96	$66,362	1,316,974
2024-11-21	Bornstein Jonathan	President of Amprius Lab	Sell	15,000	$1.96	$29,436	1,040,950
2024-11-21	Wallach Sandra	Chief Financial Officer	Sell	17,158	$1.96	$33,709	696,142
2024-11-21	Stefan Constantin Ionel	Chief Technology Officer	Sell	8,575	$1.96	$16,846	430,555
2024-11-20	Bornstein Jonathan	President of Amprius Lab	Sell	133,536	$1.92	$256,883	1,039,187
2024-10-23	Amprius, Inc.	10% Owner	Other	5,500,000	—	—	59,695,997
2024-10-23	Bornstein Jonathan	President of Amprius Lab	Award	3,471	—	—	3,471
2024-10-23	Bornstein Jonathan	President of Amprius Lab	Other	1,661,787	—	—	1,661,787
2024-10-23	Stefan Constantin Ionel	Chief Technology Officer	Other	439,130	—	—	439,130
2024-10-23	Stefan Constantin Ionel	Chief Technology Officer	Award	3,471	—	—	3,471
2024-10-23	Sun Kang	Director	Award	208,265	—	—	208,265
2024-10-23	Chu Steven	Director	Award	173,554	—	—	173,554
2024-09-05	MIRRO JUSTIN E	Director	Sell	110,000	$0.81	$88,550	2,073,042
2024-09-04	MIRRO JUSTIN E	Director	Sell	150,000	$0.94	$140,970	2,183,042
2024-09-04	Amprius, Inc.	10% Owner	Sell	13,255	$0.95	$12,592	65,195,997