AMPX Insider Trading

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Insider Trading History
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About

Insider Ownership Percentage: 12.90%

Insider Buying (Last 12 Months): $0.00

Insider Selling (Last 12 Months): $12,837,479.43

Amprius Technologies Insider Trading History Chart

Amprius Technologies Share Price & Price History

^$12.24

▲ +0.72 (6.25%)

As of 12/4/2025 04:59 PM ET

Days: 30 | 90 | 365

Amprius Technologies Insider Trading History

Transaction Date	Insider Name	Title	Buy/Sell	Number of Shares	Average Share Price	Total Transaction	Shares Held After Transaction
11/21/2025	Constantin Ionel Stefan	CTO	Sell	25,024	$10.08	$252,241.92	821,951
11/21/2025	Kang Sun	CEO	Sell	68,655	$10.08	$692,042.40	1,403,651
11/17/2025	Kang Sun	CEO	Sell	1,000,000	$10.60	$10,600,000.00	1,472,306
8/21/2025	Constantin Ionel Stefan	CTO	Sell	19,159	$6.82	$130,664.38	846,975
8/21/2025	Kang Sun	CEO	Sell	65,654	$6.82	$447,760.28	1,472,306
8/21/2025	Sandra Wallach	CFO	Sell	28,390	$6.82	$193,619.80	1,005,275
5/21/2025	Constantin Ionel Stefan	CTO	Sell	20,366	$2.43	$49,489.38	866,134
5/21/2025	Kang Sun	CEO	Sell	69,786	$2.43	$169,579.98	1,812,235
5/21/2025	Sandra Wallach	CFO	Sell	27,595	$2.43	$67,055.85	1,033,665
2/21/2025	Constantin Ionel Stefan	CTO	Sell	9,066	$3.13	$28,376.58	421,489
2/21/2025	Jonathan Bornstein	Insider	Sell	13,527	$3.13	$42,339.51	419,197
2/21/2025	Kang Sun	CEO	Sell	34,353	$3.13	$107,524.89	1,282,621
2/21/2025	Sandra Wallach	CFO	Sell	18,142	$3.13	$56,784.46	678,000
11/21/2024	Constantin Ionel Stefan	CTO	Sell	8,575	$1.96	$16,807.00	430,555
11/21/2024	Jonathan Bornstein	Insider	Sell	18,170	$1.96	$35,613.20	454,131
11/21/2024	Sandra Wallach	CFO	Sell	17,158	$1.96	$33,629.68	696,142
9/5/2024	Justin E Mirro	Director	Sell	250,000	$0.81	$202,500.00	1,195,000
9/3/2024	Amprius, Inc.	Major Shareholder	Sell	6,300	$1.00	$6,300.00	65,209,252
9/3/2024	Justin E Mirro	Director	Sell	135,000	$1.00	$135,000.00	1,510,000
8/21/2024	Constantin Ionel Stefan	CTO	Sell	8,800	$1.04	$9,152.00	386,168
8/21/2024	Jonathan Bornstein	Insider	Sell	18,644	$1.04	$19,389.76	1,528,251
8/21/2024	Kang Sun	CEO	Sell	33,333	$1.04	$34,666.32	1,350,753
8/21/2024	Sandra Wallach	CFO	Sell	17,606	$1.04	$18,310.24	713,300
6/14/2024	Justin E Mirro	Director	Sell	260,000	$1.13	$293,800.00	1,467,142
6/12/2024	Justin E Mirro	Director	Sell	280,000	$1.30	$364,000.00	1,715,000
5/21/2024	Constantin Ionel Stefan	CTO	Sell	5,272	$1.33	$7,011.76	399,089
5/21/2024	Kang Sun	Insider	Sell	19,973	$1.33	$26,564.09	1,399,697
5/21/2024	Sandra Wallach	CFO	Sell	10,549	$1.33	$14,030.17	739,151
3/5/2024	Jonathan Bornstein	Insider	Sell	109,800	$2.92	$320,616.00
2/6/2024	Jonathan Bornstein	insider	Sell	150,000	$4.43	$664,500.00
1/2/2024	Jonathan Bornstein	insider	Sell	150,000	$4.44	$666,000.00
12/15/2023	Amprius, Inc.	Major Shareholder	Sell	100,000	$3.54	$354,000.00	65,215,552
12/14/2023	Justin E Mirro	Director	Sell	255,000	$3.56	$907,800.00	1,785,000
12/13/2023	Amprius, Inc.	Major Shareholder	Sell	100,000	$3.62	$362,000.00	65,415,552
12/12/2023	Justin E Mirro	Director	Sell	60,000	$3.81	$228,600.00	1,900,000
12/7/2023	Jonathan Bornstein	insider	Sell	54,477	$3.88	$211,370.76
12/7/2023	Justin E Mirro	Director	Sell	30,000	$3.88	$116,400.00	1,920,000
12/5/2023	Jonathan Bornstein	insider	Sell	47,756	$4.28	$204,395.68
12/5/2023	Justin E Mirro	Director	Sell	30,000	$4.32	$129,600.00	1,940,000
11/30/2023	Justin E Mirro	Director	Sell	45,000	$4.19	$188,550.00	1,950,000
11/28/2023	Justin E Mirro	Director	Sell	45,000	$3.71	$166,950.00	1,985,000
11/20/2023	Jonathan Bornstein	insider	Sell	27,631	$3.84	$106,103.04
11/9/2023	Jonathan Bornstein	insider	Sell	49,508	$2.82	$139,612.56
11/7/2023	Jonathan Bornstein	insider	Sell	24,809	$3.24	$80,381.16
10/11/2023	Jonathan Bornstein	insider	Sell	56,702	$4.16	$235,880.32
9/19/2023	Jonathan Bornstein	insider	Sell	143,516	$4.37	$627,164.92
9/14/2023	Constantin Ionel Stefan	CTO	Sell	46,370	$3.66	$169,714.20	63,421
6/14/2023	Justin E Mirro	Director	Sell	50,000	$9.50	$475,000.00	2,558,142

SEC Filings (Institutional Ownership Changes) for Amprius Technologies (NYSE:AMPX)

5.04% of Amprius Technologies stock is owned by institutions. Institutional ownership can be a sign of analyst confidence in the fundamentals of the stock.

Institutional Buying and Selling by Quarter

Amprius Technologies Institutional Trading History

Reporting Date	Hedge Fund	Shares Held	Market Value	% of Portfolio	Quarterly Change in Shares	Ownership in Company
11/19/2025	Caitong International Asset Management Co. Ltd	15,220	$0.16M	0.1%	+761.8%	0.012%
11/17/2025	Dark Forest Capital Management LP	20,133	$0.21M	0.0%	N/A	0.015%
11/17/2025	PharVision Advisers LLC	26,558	$0.28M	0.2%	N/A	0.020%
11/17/2025	XTX Topco Ltd	173,005	$1.82M	0.1%	+1,560.3%	0.133%
11/17/2025	Voleon Capital Management LP	33,507	$0.35M	0.0%	N/A	0.026%
11/17/2025	Voloridge Investment Management LLC	1,876,140	$19.74M	0.1%	N/A	1.438%
11/17/2025	Verition Fund Management LLC	323,444	$3.40M	0.0%	+82.1%	0.248%
11/17/2025	Quarry LP	3,990	$42K	0.0%	N/A	0.003%
11/17/2025	Prelude Capital Management LLC	14,018	$0.15M	0.0%	N/A	0.011%
11/17/2025	Numerai GP LLC	74,511	$0.78M	0.1%	N/A	0.057%
11/17/2025	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	510,454	$5.37M	0.0%	+900.1%	0.391%
11/17/2025	Focus Partners Wealth	26,484	$0.28M	0.0%	+9.3%	0.020%
11/17/2025	Brevan Howard Capital Management LP	69,792	$0.73M	0.0%	N/A	0.053%
11/17/2025	Capitolis Liquid Global Markets LLC	680,600	$7.16M	0.1%	N/A	0.522%
11/17/2025	Bank of America Corp DE	290,441	$3.06M	0.0%	+129.1%	0.223%
11/17/2025	Algert Global LLC	383,019	$4.03M	0.1%	N/A	0.294%
11/17/2025	Alliancebernstein L.P.	123,860	$1.30M	0.0%	-24.5%	0.095%
11/17/2025	Ameriprise Financial Inc.	33,014	$0.35M	0.0%	N/A	0.025%
11/14/2025	Schonfeld Strategic Advisors LLC	65,386	$0.69M	0.0%	N/A	0.050%
11/14/2025	Creative Planning	22,826	$0.24M	0.0%	+60.1%	0.017%
11/14/2025	Raymond James Financial Inc.	239,968	$2.52M	0.0%	+2,116.8%	0.192%
11/14/2025	California State Teachers Retirement System	83,626	$0.88M	0.0%	+1,337.9%	0.067%
11/14/2025	Osterweis Capital Management Inc.	187,445	$1.97M	0.1%	N/A	0.150%
11/14/2025	Zurcher Kantonalbank Zurich Cantonalbank	24,680	$0.26M	0.0%	N/A	0.020%
11/14/2025	UBS AM A Distinct Business Unit of UBS Asset Management Americas LLC	116,484	$1.23M	0.0%	N/A	0.093%
11/14/2025	Two Sigma Investments LP	1,753,577	$18.45M	0.0%	+24.2%	1.402%
11/14/2025	Squarepoint Ops LLC	57,605	$0.61M	0.0%	-11.9%	0.046%
11/14/2025	FORA Capital LLC	13,391	$0.14M	0.0%	N/A	0.011%
11/13/2025	Jump Financial LLC	242,700	$2.55M	0.0%	N/A	0.194%
11/13/2025	Entropy Technologies LP	90,101	$0.95M	0.1%	N/A	0.072%
11/13/2025	Quadrature Capital Ltd	180,197	$1.90M	0.0%	N/A	0.144%
11/13/2025	HITE Hedge Asset Management LLC	57,802	$0.61M	0.0%	-64.2%	0.046%
11/13/2025	Arrowstreet Capital Limited Partnership	471,791	$4.96M	0.0%	N/A	0.377%
11/13/2025	Invesco Ltd.	2,379,384	$25.03M	0.0%	+113.3%	1.902%
11/13/2025	Sei Investments Co.	78,720	$0.83M	0.0%	+669.6%	0.063%
11/13/2025	Capital Fund Management S.A.	131,411	$1.38M	0.0%	N/A	0.105%
11/13/2025	BNP Paribas Financial Markets	1,943,905	$20.45M	0.0%	+1,117.9%	1.554%
11/13/2025	Legal & General Group Plc	87,377	$0.92M	0.0%	+741.5%	0.070%
11/13/2025	Russell Investments Group Ltd.	305,073	$3.21M	0.0%	+5,146.3%	0.244%
11/13/2025	Dynamic Technology Lab Private Ltd	51,550	$0.54M	0.1%	+70.5%	0.041%
11/13/2025	Parallel Advisors LLC	5,121	$54K	0.0%	N/A	0.004%
11/13/2025	Blair William & Co. IL	24,788	$0.26M	0.0%	N/A	0.020%
11/13/2025	First Trust Advisors LP	30,678	$0.32M	0.0%	N/A	0.025%
11/12/2025	Picton Mahoney Asset Management	70,981	$0.75M	0.0%	N/A	0.057%
11/12/2025	Legato Capital Management LLC	251,268	$2.64M	0.3%	-9.2%	0.201%
11/12/2025	Victory Capital Management Inc.	11,817	$0.12M	0.0%	+14.7%	0.009%
11/12/2025	Quantbot Technologies LP	131,922	$1.39M	0.0%	N/A	0.105%
11/12/2025	Abacus Wealth Partners LLC	20,000	$0.21M	0.0%	N/A	0.016%
11/12/2025	Intech Investment Management LLC	38,203	$0.40M	0.0%	-14.7%	0.031%
11/12/2025	Fox Run Management L.L.C.	32,523	$0.34M	0.1%	N/A	0.026%
11/10/2025	Counterpoint Mutual Funds LLC	47,639	$0.50M	0.0%	N/A	0.038%
11/10/2025	AXQ Capital LP	17,376	$0.18M	0.1%	N/A	0.014%
11/10/2025	Ameritas Investment Partners Inc.	7,787	$82K	0.0%	-18.2%	0.006%
11/10/2025	Jupiter Asset Management Ltd.	199,385	$2.10M	0.0%	N/A	0.159%
11/7/2025	GSA Capital Partners LLP	101,053	$1.06M	0.1%	+38.4%	0.081%
11/7/2025	Vanguard Group Inc.	6,512,620	$68.51M	0.0%	+37.0%	5.207%
11/6/2025	Rhumbline Advisers	129,991	$1.37M	0.0%	+5.5%	0.104%
11/6/2025	Essex Investment Management Co. LLC	697,387	$7.34M	1.1%	-32.0%	0.558%
11/6/2025	Bryce Point Capital LLC	11,146	$0.12M	0.1%	N/A	0.009%
11/6/2025	ProShare Advisors LLC	15,937	$0.17M	0.0%	-16.6%	0.013%
11/6/2025	Oppenheimer & Co. Inc.	299,339	$3.15M	0.0%	-33.4%	0.239%
11/5/2025	Alps Advisors Inc.	148,780	$1.57M	0.0%	N/A	0.119%
11/5/2025	Envestnet Asset Management Inc.	22,095	$0.23M	0.0%	N/A	0.018%
11/4/2025	Jones Financial Companies Lllp	4,532	$50K	0.0%	+353.2%	0.004%
11/4/2025	Lisanti Capital Growth LLC	265,725	$2.80M	0.7%	N/A	0.212%
11/3/2025	Arizona State Retirement System	26,753	$0.28M	0.0%	N/A	0.021%
11/3/2025	Foundations Investment Advisors LLC	121,134	$1.27M	0.0%	+31.1%	0.097%
11/3/2025	New York State Common Retirement Fund	29,637	$0.31M	0.0%	+146.2%	0.024%
11/3/2025	Mirae Asset Global Investments Co. Ltd.	58,433	$0.62M	0.0%	N/A	0.047%
11/3/2025	Federated Hermes Inc.	91,803	$0.97M	0.0%	N/A	0.073%
10/30/2025	Huntleigh Advisors Inc.	156,066	$1.64M	0.3%	+7.0%	0.125%
10/29/2025	DMC Group LLC	12,944	$0.14M	0.1%	N/A	0.010%
10/28/2025	Stephens Investment Management Group LLC	1,082,907	$11.39M	0.1%	N/A	0.866%
10/28/2025	Thames Capital Management LLC	526,832	$5.54M	0.8%	N/A	0.421%
10/27/2025	Stephens Inc. AR	20,331	$0.21M	0.0%	N/A	0.016%
10/23/2025	Kingswood Wealth Advisors LLC	77,705	$0.82M	0.0%	-9.0%	0.062%
10/23/2025	SLT Holdings LLC	120,300	$1.27M	0.8%	+31.1%	0.096%
10/23/2025	KLP Kapitalforvaltning AS	35,900	$0.38M	0.0%	N/A	0.029%
10/22/2025	Geneos Wealth Management Inc.	7,045	$74K	0.0%	N/A	0.006%
10/20/2025	Allspring Global Investments Holdings LLC	49,104	$0.52M	0.0%	N/A	0.039%
10/20/2025	Calamos Advisors LLC	171,052	$1.80M	0.0%	N/A	0.137%
10/15/2025	Inspire Investing LLC	43,830	$0.46M	0.0%	N/A	0.035%
10/9/2025	Voya Investment Management LLC	16,876	$0.18M	0.0%	-34.8%	0.013%
10/9/2025	Harbour Capital Advisors LLC	40,315	$0.42M	0.1%	N/A	0.032%
8/19/2025	B. Riley Wealth Advisors Inc.	50,500	$0.21M	0.0%	N/A	0.040%
8/15/2025	BNP Paribas Financial Markets	159,614	$0.67M	0.0%	+2,677.3%	0.135%
8/15/2025	Bridgeway Capital Management LLC	135,000	$0.57M	0.0%	-30.8%	0.114%
8/15/2025	Bank of America Corp DE	126,779	$0.53M	0.0%	+50.7%	0.108%
8/14/2025	Raymond James Financial Inc.	10,825	$46K	0.0%	-29.4%	0.009%
8/14/2025	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.	51,041	$0.22M	0.0%	+419.1%	0.043%
8/14/2025	The Manufacturers Life Insurance Company	34,301	$0.14M	0.0%	N/A	0.029%
8/13/2025	Marshall Wace LLP	1,105,413	$4.65M	0.0%	+16.1%	0.937%
8/13/2025	Baird Financial Group Inc.	1,000,711	$4.21M	0.0%	+99.9%	0.849%
8/13/2025	Invesco Ltd.	1,115,538	$4.70M	0.0%	-4.4%	0.946%
8/13/2025	OMERS ADMINISTRATION Corp	49,600	$0.21M	0.0%	N/A	0.042%
8/12/2025	XTX Topco Ltd	10,420	$44K	0.0%	N/A	0.009%
8/12/2025	Ameritas Investment Partners Inc.	9,516	$40K	0.0%	+2,043.2%	0.008%
8/12/2025	Prudential Financial Inc.	10,775	$45K	0.0%	N/A	0.009%
8/12/2025	Rhumbline Advisers	123,260	$0.52M	0.0%	+685.6%	0.105%
8/12/2025	Legal & General Group Plc	10,383	$44K	0.0%	+1,385.4%	0.009%

Data available starting January 2016

Amprius Technologies, Inc. produces and sells ultra-high energy density lithium-ion batteries for mobility applications. The company offers silicon nanowire anode batteries. Its batteries are primarily used for existing and emerging aviation applications, including unmanned aerial systems, such as drones and high-altitude pseudo satellites. The company was incorporated in 2008 and is headquartered in Fremont, California.

Today's Range

Now: $12.24

$11.27

$12.49

50 Day Range

MA: $11.99

$10.08

$14.67

52 Week Range

Now: $12.24

$1.63

$16.03

Volume

6,704,899 shs

Average Volume

6,959,221 shs

Market Capitalization

$1.60 billion

P/E Ratio

N/A

Dividend Yield

N/A

Beta

2.94

Who are the company insiders with the largest holdings of Amprius Technologies?: Amprius Technologies' top insider investors include:
Amprius, Inc (Major Shareholder)
Justin E Mirro (Director)
Kang Sun (CEO)
Jonathan Bornstein (Insider)
Kang Sun (Insider)
Sandra Wallach (CFO)
Constantin Ionel Stefan (CTO)
Learn More about top insider investors at Amprius Technologies.
Who are the major institutional investors of Amprius Technologies?: Amprius Technologies' top institutional shareholders include:
Vanguard Group Inc. — 5.21%
Invesco Ltd. — 1.90%
BNP Paribas Financial Markets — 1.55%
Voloridge Investment Management LLC — 1.44%
Two Sigma Investments LP — 1.40%
Stephens Investment Management Group LLC — 0.87%
Learn More about top institutional investors of Amprius Technologies stock.
Which institutional investors are selling Amprius Technologies stock?: During the last quarter, AMPX stock was sold by these institutional investors:
Essex Investment Management Co. LLC
Oppenheimer & Co. Inc.
HITE Hedge Asset Management LLC
Alliancebernstein L.P.
Legato Capital Management LLC
Voya Investment Management LLC
Squarepoint Ops LLC
Kingswood Wealth Advisors LLC
Within the previous year, company insiders that have sold Amprius Technologies company stock include:
Amprius, Inc (Major Shareholder)
Justin E Mirro (Director)
Kang Sun (CEO)
Jonathan Bornstein (Insider)
Learn More investors selling Amprius Technologies stock.
Which institutional investors are buying Amprius Technologies stock?: During the previous quarter, AMPX stock was bought by institutional investors including:
Voloridge Investment Management LLC
BNP Paribas Financial Markets
Vanguard Group Inc.
Invesco Ltd.
Stephens Investment Management Group LLC
Capitolis Liquid Global Markets LLC
Thames Capital Management LLC
Arrowstreet Capital Limited Partnership