AMPRIUS TECHNOLOGIES INC (AMPX) Institutional Ownership Changes & 13F Activity

AMPRIUS TECHNOLOGIES INC (AMPX). Institutional ownership data tracks hedge funds, asset managers, and other institutional investors based on recent SEC Form 13F filings. This page analyzes institutional buying and selling activity, new holdings, and sold-out positions among tracked filers. Notable filers include Renaissance Technologies LLC and Polen Capital Management.

Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q1 2026Renaissance Technologies LLCBuy246,700359,525$6,061,592
Q1 2026Polen Capital ManagementBuy133,855422,145$7,117,365
Q4 2025Renaissance Technologies LLCBuy100,425112,825$890,189
Q4 2025Polen Capital ManagementSell-51,137288,290$2,274,608
Q3 2025Renaissance Technologies LLCSell-1,334,20012,400$130,448
Q3 2025Polen Capital ManagementBuy339,427339,427$3,570,772
Q2 2025Renaissance Technologies LLCBuy1,332,2001,346,600$5,669,186
Q1 2025Renaissance Technologies LLCSell-750,70014,400$38,592
Q4 2024Renaissance Technologies LLCBuy752,000765,100$2,142,280
Q3 2024Renaissance Technologies LLCBuy13,10013,100$14,541

Frequently asked questions about AMPX activity

  • Which institutional owners are buying AMPX?

    Institutional owners buying AMPX include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in AMPX activity?

    "Buy" means an investor increased their reported position in AMPX compared to the prior reporting period. This reflects growing exposure to AMPRIUS TECHNOLOGIES INC (AMPX) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in AMPX increasing?

    Institutional interest in AMPX can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.

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