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Security record · archived quarter

AMPX

Amprius Technologies, Inc. · Industrials · Electrical Equipment & Parts

8.87 -6.0% mkt cap $1.26B quote delayed (FMP) · as of Oct 12 22:08 UTC — separate from filing data below

Q2 2026 Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024
4Tracked holders
-1Δ holders
702.69KShares held
$780,036Reported value
+1New positions
−2Exits
— How these are computed → Explain this at the Research Desk →

All ownership figures: tracked 13F managers only, common-stock positions, reporting period Q3 2024

Ownership over time
QuarterHoldersΔSharesReported valueNewExits
Q2 2026 100 +11 74.75M $1.04B +15 −6
Q1 2026 94 +14 62.16M $1.04B +16 −3
Q4 2025 81 -2 49.31M $389.08M +1 −2
Q3 2025 17 +2 29.27M $307.95M +2 —
Q2 2025 12 +1 20.97M $88.27M +1 —
Q1 2025 8 +1 3.89M $10.43M +1 —
Q4 2024 7 +2 2.99M $8.36M +2 —
Q3 2024 4 -1 702.69K $780,036 +1 −2
Q2 2024 5 — 946.88K $1.20M — —
Holder count
Who holds it · Q3 2024
#ManagerSharesΔ sharesValueTheir weightHeld
1 Geode Capital Management ✦ (passive) 548.14K +50.9% $608,482 0.0% ▲ Add 2 SEC ↗ ×2
2 Two Sigma Investments ✦ 104.79K -52.4% $116,314 0.0% ▼ Trim 2 SEC ↗
3 AQR Capital Management ✦ 36.66K -53.2% $40,699 0.0% ▼ Trim 2 SEC ↗ ×2
4 Renaissance Technologies ✦ 13.10K New $14,541 0.0% New 1 SEC ↗

“Their weight” = the position's share of that manager's reported 13F equity value — the conviction measure. ✦ = curated manager.

New buyers

Exited

Millennium Management $228,073 was 0.0%
Citadel Advisors $133,928 was 0.0%

Full-market context: across ALL 13F filers (SEC structured data, Q1 2026): 245 holders, 83.42M shares, $1.34B reported. This is a different, older period than the tracked-universe figures above and the two are never mixed.

Frequently co-owned

What else this security's tracked holders most often hold — shared-ownership counts, not fundamental relationships.

Insider transactions

Open-market purchases (P)

No open-market insider purchases in our coverage window.

Open-market sales (S)

Aug 24 Stepien Thomas M

Officer, Director · 8.00K sh · $80,240

Aug 21 Sun Kang

Director · 62.10K sh · $642,186

Aug 21 Stepien Thomas M

Officer, Director · 23.53K sh · $243,313

Aug 21 Stefan Constantin Ionel

Officer · 29.68K sh · $306,931

Awards, exercises and tax withholding are never counted as buys or sales here. Methodology

Beneficial ownership
Aug 10 SC 13G/A — JANE STREET GROUP, LLC

View original SEC filing ↗

Jul 27 SC 13G/A — BlackRock, Inc.

View original SEC filing ↗

Provenance: Ownership from parsed 13F common-stock positions (tracked universe, comparable sets for changes); insider rows from Forms 3/4/5; stakes from Schedules 13D/13G; every filing links to its original on SEC EDGAR. Reporting period: Q3 2024 · Methodology · Get this via the API