Skip to main content
AMPX logo

AMPX · Amprius Technologies, Inc.

Track AMPX — free
$9.89 +0.26 (+2.70%) At close · Sep 4
Market Cap
$1.44B
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: 264
Total Value: $1,695,652,188
Total Shares: 122,341,482
Showing 1–100 of 293 holdings by value · page 1 of 3

Institutional Ownership Trend

16 quarters

Holder Concentration

Across 264 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
51.0%
Sep 2023 → Jun 2026 · range 47.1% – 88.6%
+4.0 pts
HHI
343
Sep 2023 → Jun 2026 · range 311 – 1,521
Broadly held+32

Quarterly Activity

vs Mar 31, 2026
New
64
Increased
114
Decreased
63
Sold Out
52
Unchanged
23
Holder count: +12
Institutional value: -0.7%
Shares held: +20.7%

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 293
Export CSV
Holder Value (USD) % of 13F Shares Open
Key facts CIK 1899287 CUSIP 03214Q108 13F (30d) 198 filings 196 filers Visit website Investor relations