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AMPX · Amprius Technologies, Inc.

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$10.20 -0.43 (-4.05%) At close · Aug 20
Market Cap
$1.49B
Shares
146.08M

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Holders: 263
Total Value: $1,693,697,041
Total Shares: 122,200,418

Institutional Ownership Trend

16 quarters

Holder Concentration

Across 263 13F filers · Δ vs Mar 31, 2026
Top Holder
9.3%
Sep 2023 → Jun 2026 · range 9.1% – 28.3%
+0.2 pts
Top 5
32.6%
Sep 2023 → Jun 2026 · range 31.1% – 77.0%
+1.5 pts
Top 10
51.1%
Sep 2023 → Jun 2026 · range 47.1% – 88.6%
+4.0 pts
HHI
344
Sep 2023 → Jun 2026 · range 311 – 1,521
Broadly held+33

Quarterly Activity

vs Mar 31, 2026
New
64
Increased
114
Decreased
62
Sold Out
53
Unchanged
23
Holder count: +11
Institutional value: -0.9%
Shares held: +20.6%

Top Buyers

vs Mar 31, 2026
Institution Added Now Holds Open

Top Sellers

vs Mar 31, 2026
Institution Sold Now Holds Open

Top New Positions

vs Mar 31, 2026
Institution Acquired Value (USD) Open

Top Sold-Out Positions

vs Mar 31, 2026
Institution Previously Held Last Value (USD) Open
Showing 100 of 292
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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1899287 CUSIP 03214Q108 13F (30d) 245 filings 243 filers Visit website Investor relations