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AMPX Insider Trading

Insider Ownership Percentage: 12.80%
Insider Buying (Last 12 Months): $0.00
Insider Selling (Last 12 Months): $38,341,810.17

Amprius Technologies Insider Trading History Chart

This chart shows the insider buying and selling history at Amprius Technologies by year and by quarter.

Skip ChartChart Data in Insider Trading History Table

Amprius Technologies Share Price & Price History

Current Price: $12.26
Price Change: ▼ Price Decrease of -2.424 (-16.51%)
As of 02/4/2026 01:30 PM ET

This chart shows the closing price history over time for AMPX up to the past year.

Skip Chart and Table DataPrice Data in Insider Trading History Table
Days: 30 | 90 | 365

Amprius Technologies Insider Trading History

Transaction DateInsider NameTitleBuy/SellNumber of SharesAverage Share PriceTotal TransactionShares Held After TransactionDetails
1/28/2026Constantin Ionel StefanCTOSell39,690$12.00$476,280.00748,696View SEC Filing Icon  
1/23/2026Constantin Ionel StefanCTOSell1,600$12.00$19,200.00748,696View SEC Filing Icon  
1/22/2026Constantin Ionel StefanCTOSell492,827$12.04$5,933,637.08748,696View SEC Filing Icon  
1/21/2026Constantin Ionel StefanCTOSell73,280$12.00$879,360.00748,696View SEC Filing Icon  
1/20/2026Kang SunDirectorSell43,185$11.03$476,330.551,403,651View SEC Filing Icon  
1/16/2026Kang SunDirectorSell950,548$11.07$10,522,566.361,403,651View SEC Filing Icon  
1/12/2026Kang SunDirectorSell506,267$10.10$5,113,296.701,403,651View SEC Filing Icon  
12/11/2025Constantin Ionel StefanCTOSell198,255$10.51$2,083,660.05748,696View SEC Filing Icon  
11/21/2025Constantin Ionel StefanCTOSell25,024$10.08$252,241.92821,951View SEC Filing Icon  
11/21/2025Kang SunCEOSell68,655$10.08$692,042.401,403,651View SEC Filing Icon  
11/17/2025Kang SunCEOSell1,000,000$10.60$10,600,000.001,472,306View SEC Filing Icon  
8/21/2025Constantin Ionel StefanCTOSell19,159$6.82$130,664.38846,975View SEC Filing Icon  
8/21/2025Kang SunCEOSell65,654$6.82$447,760.281,472,306View SEC Filing Icon  
8/21/2025Sandra WallachCFOSell28,390$6.82$193,619.801,005,275View SEC Filing Icon  
5/21/2025Constantin Ionel StefanCTOSell20,366$2.43$49,489.38866,134View SEC Filing Icon  
5/21/2025Kang SunCEOSell69,786$2.43$169,579.981,812,235View SEC Filing Icon  
5/21/2025Sandra WallachCFOSell27,595$2.43$67,055.851,033,665View SEC Filing Icon  
2/21/2025Constantin Ionel StefanCTOSell9,066$3.13$28,376.58421,489View SEC Filing Icon  
2/21/2025Jonathan BornsteinInsiderSell13,527$3.13$42,339.51419,197View SEC Filing Icon  
2/21/2025Kang SunCEOSell34,353$3.13$107,524.891,282,621View SEC Filing Icon  
2/21/2025Sandra WallachCFOSell18,142$3.13$56,784.46678,000View SEC Filing Icon  
11/21/2024Constantin Ionel StefanCTOSell8,575$1.96$16,807.00430,555View SEC Filing Icon  
11/21/2024Jonathan BornsteinInsiderSell18,170$1.96$35,613.20454,131View SEC Filing Icon  
11/21/2024Sandra WallachCFOSell17,158$1.96$33,629.68696,142View SEC Filing Icon  
9/5/2024Justin E MirroDirectorSell250,000$0.81$202,500.001,195,000View SEC Filing Icon  
9/3/2024Amprius, Inc.Major ShareholderSell6,300$1.00$6,300.0065,209,252View SEC Filing Icon  
9/3/2024Justin E MirroDirectorSell135,000$1.00$135,000.001,510,000View SEC Filing Icon  
8/21/2024Constantin Ionel StefanCTOSell8,800$1.04$9,152.00386,168View SEC Filing Icon  
8/21/2024Jonathan BornsteinInsiderSell18,644$1.04$19,389.761,528,251View SEC Filing Icon  
8/21/2024Kang SunCEOSell33,333$1.04$34,666.321,350,753View SEC Filing Icon  
8/21/2024Sandra WallachCFOSell17,606$1.04$18,310.24713,300View SEC Filing Icon  
6/14/2024Justin E MirroDirectorSell260,000$1.13$293,800.001,467,142View SEC Filing Icon  
6/12/2024Justin E MirroDirectorSell280,000$1.30$364,000.001,715,000View SEC Filing Icon  
5/21/2024Constantin Ionel StefanCTOSell5,272$1.33$7,011.76399,089View SEC Filing Icon  
5/21/2024Kang SunInsiderSell19,973$1.33$26,564.091,399,697View SEC Filing Icon  
5/21/2024Sandra WallachCFOSell10,549$1.33$14,030.17739,151View SEC Filing Icon  
3/5/2024Jonathan BornsteinInsiderSell109,800$2.92$320,616.00View SEC Filing Icon  
2/6/2024Jonathan BornsteininsiderSell150,000$4.43$664,500.00View SEC Filing Icon  
1/2/2024Jonathan BornsteininsiderSell150,000$4.44$666,000.00View SEC Filing Icon  
12/15/2023Amprius, Inc.Major ShareholderSell100,000$3.54$354,000.0065,215,552View SEC Filing Icon  
12/14/2023Justin E MirroDirectorSell255,000$3.56$907,800.001,785,000View SEC Filing Icon  
12/13/2023Amprius, Inc.Major ShareholderSell100,000$3.62$362,000.0065,415,552View SEC Filing Icon  
12/12/2023Justin E MirroDirectorSell60,000$3.81$228,600.001,900,000View SEC Filing Icon  
12/7/2023Jonathan BornsteininsiderSell54,477$3.88$211,370.76View SEC Filing Icon  
12/7/2023Justin E MirroDirectorSell30,000$3.88$116,400.001,920,000View SEC Filing Icon  
12/5/2023Jonathan BornsteininsiderSell47,756$4.28$204,395.68View SEC Filing Icon  
12/5/2023Justin E MirroDirectorSell30,000$4.32$129,600.001,940,000View SEC Filing Icon  
11/30/2023Justin E MirroDirectorSell45,000$4.19$188,550.001,950,000View SEC Filing Icon  
11/28/2023Justin E MirroDirectorSell45,000$3.71$166,950.001,985,000View SEC Filing Icon  
11/20/2023Jonathan BornsteininsiderSell27,631$3.84$106,103.04View SEC Filing Icon  
11/9/2023Jonathan BornsteininsiderSell49,508$2.82$139,612.56View SEC Filing Icon  
11/7/2023Jonathan BornsteininsiderSell24,809$3.24$80,381.16View SEC Filing Icon  
10/11/2023Jonathan BornsteininsiderSell56,702$4.16$235,880.32View SEC Filing Icon  
9/19/2023Jonathan BornsteininsiderSell143,516$4.37$627,164.92View SEC Filing Icon  
9/14/2023Constantin Ionel StefanCTOSell46,370$3.66$169,714.2063,421View SEC Filing Icon  
6/14/2023Justin E MirroDirectorSell50,000$9.50$475,000.002,558,142View SEC Filing Icon  
See Full Table

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

This chart shows the instiutional buying and selling at AMPX by year and by quarter.

Skip Institutional Buying and Selling Chart and Table DataRead Chart Data in Institutional Trading History Table

Amprius Technologies Institutional Trading History

Reporting DateHedge FundShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
2/3/2026EWA LLC19,958$0.16M0.0%+3.8%0.015%Search for SEC Filing on Google Icon
2/2/2026Hussman Strategic Advisors Inc.210,000$1.66M0.4%N/A0.161%Search for SEC Filing on Google Icon
2/2/2026Artemis Investment Management LLP464,029$3.66M0.0%-3.0%0.356%Search for SEC Filing on Google Icon
2/2/2026Oppenheimer & Co. Inc.442,090$3.49M0.0%+47.7%0.339%Search for SEC Filing on Google Icon
1/30/2026Wealthfront Advisers LLC14,352$0.11M0.0%N/A0.011%Search for SEC Filing on Google Icon
1/29/2026Huntleigh Advisors Inc.160,599$1.27M0.2%+2.9%0.123%Search for SEC Filing on Google Icon
1/29/2026UBS Group AG2,098,946$16.56M0.0%+35.5%1.609%Search for SEC Filing on Google Icon
1/29/2026Vanguard Group Inc.7,128,657$56.25M0.0%+9.5%5.463%Search for SEC Filing on Google Icon
1/29/2026Calamos Advisors LLC119,033$0.94M0.0%-30.4%0.091%Search for SEC Filing on Google Icon
1/29/2026NBC Securities Inc.15,570$0.12M0.0%+84.5%0.012%Search for SEC Filing on Google Icon
1/28/2026Arizona State Retirement System31,062$0.25M0.0%+16.1%0.024%Search for SEC Filing on Google Icon
1/28/2026Geneos Wealth Management Inc.10,650$84K0.0%+51.2%0.008%Search for SEC Filing on Google Icon
1/28/2026Kingswood Wealth Advisors LLC47,705$0.38M0.0%-38.6%0.037%Search for SEC Filing on Google Icon
1/28/2026Universal Beteiligungs und Servicegesellschaft mbH11,269$89K0.0%N/A0.009%Search for SEC Filing on Google Icon
1/27/2026Zurcher Kantonalbank Zurich Cantonalbank 42,487$0.34M0.0%+72.2%0.033%Search for SEC Filing on Google Icon
1/27/2026Earned Wealth Advisors LLC13,974$0.11M0.0%N/A0.011%Search for SEC Filing on Google Icon
1/27/2026Bayforest Capital Ltd36,882$0.29M0.2%N/A0.028%Search for SEC Filing on Google Icon
1/26/2026Mirae Asset Global Investments Co. Ltd.56,092$0.44M0.0%-4.0%0.043%Search for SEC Filing on Google Icon
1/15/2026Allspring Global Investments Holdings LLC53,913$0.47M0.0%+9.8%0.041%Search for SEC Filing on Google Icon
1/9/2026SG Americas Securities LLC255,252$2.01M0.0%N/A0.196%Search for SEC Filing on Google Icon
1/9/2026Cambridge Financial Group LLC10,000$78K0.0%N/A0.008%Search for SEC Filing on Google Icon
1/1/2026Tudor Investment Corp ET AL715,736$7.53M0.0%N/A0.549%Search for SEC Filing on Google Icon
12/9/2025Tudor Investment Corp ET AL715,736$7.53M0.0%N/A0.549%Search for SEC Filing on Google Icon
11/19/2025Caitong International Asset Management Co. Ltd15,220$0.16M0.1%+761.8%0.012%Search for SEC Filing on Google Icon
11/17/2025Dark Forest Capital Management LP20,133$0.21M0.0%N/A0.015%Search for SEC Filing on Google Icon
11/17/2025PharVision Advisers LLC26,558$0.28M0.2%N/A0.020%Search for SEC Filing on Google Icon
11/17/2025XTX Topco Ltd173,005$1.82M0.1%+1,560.3%0.133%Search for SEC Filing on Google Icon
11/17/2025Voleon Capital Management LP33,507$0.35M0.0%N/A0.026%Search for SEC Filing on Google Icon
11/17/2025Voloridge Investment Management LLC1,876,140$19.74M0.1%N/A1.438%Search for SEC Filing on Google Icon
11/17/2025Verition Fund Management LLC323,444$3.40M0.0%+82.1%0.248%Search for SEC Filing on Google Icon
11/17/2025Quarry LP3,990$42K0.0%N/A0.003%Search for SEC Filing on Google Icon
11/17/2025Prelude Capital Management LLC14,018$0.15M0.0%N/A0.011%Search for SEC Filing on Google Icon
11/17/2025Numerai GP LLC74,511$0.78M0.1%N/A0.057%Search for SEC Filing on Google Icon
11/17/2025MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.510,454$5.37M0.0%+900.1%0.391%Search for SEC Filing on Google Icon
11/17/2025Focus Partners Wealth26,484$0.28M0.0%+9.3%0.020%Search for SEC Filing on Google Icon
11/17/2025Brevan Howard Capital Management LP69,792$0.73M0.0%N/A0.053%Search for SEC Filing on Google Icon
11/17/2025Capitolis Liquid Global Markets LLC680,600$7.16M0.1%N/A0.522%Search for SEC Filing on Google Icon
11/17/2025Bank of America Corp DE290,441$3.06M0.0%+129.1%0.223%Search for SEC Filing on Google Icon
11/17/2025Algert Global LLC383,019$4.03M0.1%N/A0.294%Search for SEC Filing on Google Icon
11/17/2025Alliancebernstein L.P.123,860$1.30M0.0%-24.5%0.095%Search for SEC Filing on Google Icon
11/17/2025Ameriprise Financial Inc.33,014$0.35M0.0%N/A0.025%Search for SEC Filing on Google Icon
11/14/2025Schonfeld Strategic Advisors LLC65,386$0.69M0.0%N/A0.050%Search for SEC Filing on Google Icon
11/14/2025Creative Planning22,826$0.24M0.0%+60.1%0.017%Search for SEC Filing on Google Icon
11/14/2025Raymond James Financial Inc.239,968$2.52M0.0%+2,116.8%0.192%Search for SEC Filing on Google Icon
11/14/2025California State Teachers Retirement System83,626$0.88M0.0%+1,337.9%0.067%Search for SEC Filing on Google Icon
11/14/2025Osterweis Capital Management Inc.187,445$1.97M0.1%N/A0.150%Search for SEC Filing on Google Icon
11/14/2025Zurcher Kantonalbank Zurich Cantonalbank 24,680$0.26M0.0%N/A0.020%Search for SEC Filing on Google Icon
11/14/2025UBS AM A Distinct Business Unit of UBS Asset Management Americas LLC116,484$1.23M0.0%N/A0.093%Search for SEC Filing on Google Icon
11/14/2025Two Sigma Investments LP1,753,577$18.45M0.0%+24.2%1.402%Search for SEC Filing on Google Icon
11/14/2025Squarepoint Ops LLC57,605$0.61M0.0%-11.9%0.046%Search for SEC Filing on Google Icon
11/14/2025FORA Capital LLC13,391$0.14M0.0%N/A0.011%Search for SEC Filing on Google Icon
11/13/2025Jump Financial LLC242,700$2.55M0.0%N/A0.194%Search for SEC Filing on Google Icon
11/13/2025Entropy Technologies LP90,101$0.95M0.1%N/A0.072%Search for SEC Filing on Google Icon
11/13/2025Quadrature Capital Ltd180,197$1.90M0.0%N/A0.144%Search for SEC Filing on Google Icon
11/13/2025HITE Hedge Asset Management LLC57,802$0.61M0.0%-64.2%0.046%Search for SEC Filing on Google Icon
11/13/2025Arrowstreet Capital Limited Partnership471,791$4.96M0.0%N/A0.377%Search for SEC Filing on Google Icon
11/13/2025Invesco Ltd.2,379,384$25.03M0.0%+113.3%1.902%Search for SEC Filing on Google Icon
11/13/2025Sei Investments Co.78,720$0.83M0.0%+669.6%0.063%Search for SEC Filing on Google Icon
11/13/2025Capital Fund Management S.A.131,411$1.38M0.0%N/A0.105%Search for SEC Filing on Google Icon
11/13/2025BNP Paribas Financial Markets1,943,905$20.45M0.0%+1,117.9%1.554%Search for SEC Filing on Google Icon
11/13/2025Legal & General Group Plc87,377$0.92M0.0%+741.5%0.070%Search for SEC Filing on Google Icon
11/13/2025Russell Investments Group Ltd.305,073$3.21M0.0%+5,146.3%0.244%Search for SEC Filing on Google Icon
11/13/2025Dynamic Technology Lab Private Ltd51,550$0.54M0.1%+70.5%0.041%Search for SEC Filing on Google Icon
11/13/2025Parallel Advisors LLC5,121$54K0.0%N/A0.004%Search for SEC Filing on Google Icon
11/13/2025Blair William & Co. IL24,788$0.26M0.0%N/A0.020%Search for SEC Filing on Google Icon
11/13/2025First Trust Advisors LP30,678$0.32M0.0%N/A0.025%Search for SEC Filing on Google Icon
11/12/2025Picton Mahoney Asset Management70,981$0.75M0.0%N/A0.057%Search for SEC Filing on Google Icon
11/12/2025Legato Capital Management LLC251,268$2.64M0.3%-9.2%0.201%Search for SEC Filing on Google Icon
11/12/2025Victory Capital Management Inc.11,817$0.12M0.0%+14.7%0.009%Search for SEC Filing on Google Icon
11/12/2025Quantbot Technologies LP131,922$1.39M0.0%N/A0.105%Search for SEC Filing on Google Icon
11/12/2025Abacus Wealth Partners LLC20,000$0.21M0.0%N/A0.016%Search for SEC Filing on Google Icon
11/12/2025Intech Investment Management LLC38,203$0.40M0.0%-14.7%0.031%Search for SEC Filing on Google Icon
11/12/2025Fox Run Management L.L.C.32,523$0.34M0.1%N/A0.026%Search for SEC Filing on Google Icon
11/10/2025Counterpoint Mutual Funds LLC47,639$0.50M0.0%N/A0.038%Search for SEC Filing on Google Icon
11/10/2025AXQ Capital LP17,376$0.18M0.1%N/A0.014%Search for SEC Filing on Google Icon
11/10/2025Ameritas Investment Partners Inc.7,787$82K0.0%-18.2%0.006%Search for SEC Filing on Google Icon
11/10/2025Jupiter Asset Management Ltd.199,385$2.10M0.0%N/A0.159%Search for SEC Filing on Google Icon
11/7/2025GSA Capital Partners LLP101,053$1.06M0.1%+38.4%0.081%Search for SEC Filing on Google Icon
11/7/2025Vanguard Group Inc.6,512,620$68.51M0.0%+37.0%5.207%Search for SEC Filing on Google Icon
11/6/2025Rhumbline Advisers129,991$1.37M0.0%+5.5%0.104%Search for SEC Filing on Google Icon
11/6/2025Essex Investment Management Co. LLC697,387$7.34M1.1%-32.0%0.558%Search for SEC Filing on Google Icon
11/6/2025Bryce Point Capital LLC11,146$0.12M0.1%N/A0.009%Search for SEC Filing on Google Icon
11/6/2025ProShare Advisors LLC15,937$0.17M0.0%-16.6%0.013%Search for SEC Filing on Google Icon
11/6/2025Oppenheimer & Co. Inc.299,339$3.15M0.0%-33.4%0.239%Search for SEC Filing on Google Icon
11/5/2025Alps Advisors Inc.148,780$1.57M0.0%N/A0.119%Search for SEC Filing on Google Icon
11/5/2025Envestnet Asset Management Inc.22,095$0.23M0.0%N/A0.018%Search for SEC Filing on Google Icon
11/4/2025Jones Financial Companies Lllp4,532$50K0.0%+353.2%0.004%Search for SEC Filing on Google Icon
11/4/2025Lisanti Capital Growth LLC265,725$2.80M0.7%N/A0.212%Search for SEC Filing on Google Icon
11/3/2025Arizona State Retirement System26,753$0.28M0.0%N/A0.021%Search for SEC Filing on Google Icon
11/3/2025Foundations Investment Advisors LLC121,134$1.27M0.0%+31.1%0.097%Search for SEC Filing on Google Icon
11/3/2025New York State Common Retirement Fund29,637$0.31M0.0%+146.2%0.024%Search for SEC Filing on Google Icon
11/3/2025Mirae Asset Global Investments Co. Ltd.58,433$0.62M0.0%N/A0.047%Search for SEC Filing on Google Icon
11/3/2025Federated Hermes Inc.91,803$0.97M0.0%N/A0.073%Search for SEC Filing on Google Icon
10/30/2025Huntleigh Advisors Inc.156,066$1.64M0.3%+7.0%0.125%Search for SEC Filing on Google Icon
10/29/2025DMC Group LLC12,944$0.14M0.1%N/A0.010%Search for SEC Filing on Google Icon
10/28/2025Stephens Investment Management Group LLC1,082,907$11.39M0.1%N/A0.866%Search for SEC Filing on Google Icon
10/28/2025Thames Capital Management LLC526,832$5.54M0.8%N/A0.421%Search for SEC Filing on Google Icon
10/27/2025Stephens Inc. AR20,331$0.21M0.0%N/A0.016%Search for SEC Filing on Google Icon
10/23/2025Kingswood Wealth Advisors LLC77,705$0.82M0.0%-9.0%0.062%Search for SEC Filing on Google Icon
10/23/2025SLT Holdings LLC120,300$1.27M0.8%+31.1%0.096%Search for SEC Filing on Google Icon
Data available starting January 2016

See Full Table
Amprius Technologies logo
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.
Read More on Amprius Technologies

Today's Range

Now: $12.26
Low: $12.36
High: $14.71

50 Day Range

MA: $10.40
Low: $7.84
High: $14.68

52 Week Range

Now: $12.26
Low: $1.70
High: $16.03

Volume

7,955,029 shs

Average Volume

8,734,300 shs

Market Capitalization

$1.60 billion

P/E Ratio

N/A

Dividend Yield

N/A

Beta

2.99

Who are the company insiders with the largest holdings of Amprius Technologies?

Amprius Technologies' top insider investors include:
  1. Amprius, Inc (Major Shareholder)
  2. Kang Sun (CEO)
  3. Justin E Mirro (Director)
  4. Jonathan Bornstein (Insider)
  5. Kang Sun (Director)
  6. Kang Sun (Insider)
  7. Sandra Wallach (CFO)
  8. 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:
  1. Vanguard Group Inc. — 5.46%
  2. UBS Group AG — 1.61%
  3. Artemis Investment Management LLP — 0.36%
  4. Oppenheimer & Co. Inc. — 0.34%
  5. SG Americas Securities LLC — 0.20%
  6. Hussman Strategic Advisors Inc. — 0.16%
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:
  1. Calamos Advisors LLC
  2. Kingswood Wealth Advisors LLC
  3. Artemis Investment Management LLP
  4. Mirae Asset Global Investments Co. Ltd.
Within the previous year, company insiders that have sold Amprius Technologies company stock include:
  1. Amprius, Inc (Major Shareholder)
  2. Kang Sun (CEO)
  3. Justin E Mirro (Director)
  4. Jonathan Bornstein (Insider)
  5. Kang Sun (Director)
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:
  1. Vanguard Group Inc.
  2. UBS Group AG
  3. SG Americas Securities LLC
  4. Hussman Strategic Advisors Inc.
  5. Oppenheimer & Co. Inc.
  6. Bayforest Capital Ltd
  7. Zurcher Kantonalbank Zurich Cantonalbank
  8. Wealthfront Advisers LLC