AMPX Institutional Ownership
Top institutional (13F) holders of AMPX and activist (13D/G) positions, sourced from SEC EDGAR.
Institutional owners
42
Institutional value
$1.17B
Top holder
BlackRock, Inc.
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Top holders
| Holder | Filed | Value |
|---|---|---|
| BlackRock, Inc.holding company | Aug 7, 2026 | $157.1M |
| JANE STREET GROUP, LLCholding company | Aug 14, 2026 | $129.38M |
| SUSQUEHANNA INTERNATIONAL GROUP, LLPinvestment advisor | Aug 14, 2026 | $114.3M |
| Vanguard Capital Managementinvestment advisor | Aug 13, 2026 | $77.1M |
| UBS Group AGinvestment advisor | Aug 13, 2026 | $74.48M |
| CITADEL ADVISORS LLCinvestment advisor | Sep 1, 2026 | $73.04M |
| MORGAN STANLEYholding company | Aug 13, 2026 | $70.76M |
| Point72 Asset Management, L.P.investment advisor | Aug 14, 2026 | $60.7M |
| TWO SIGMA INVESTMENTS, LPinvestment advisor | Aug 14, 2026 | $59.86M |
| GEODE CAPITAL MANAGEMENT, LLCinvestment advisor | Aug 12, 2026 | $48.81M |
| STATE STREET CORPORATIONholding company | Sep 22, 2026 | $44.91M |
| GOLDMAN SACHS GROUP INCinvestment advisor | Aug 14, 2026 | $35.24M |
| T. Rowe Price Associates, Inc.investment advisor | Aug 14, 2026 | $22.68M |
| D. E. Shaw & Co., Inc.investment advisor | Aug 14, 2026 | $21.3M |
| Vanguard Portfolio Managementinvestment advisor | Aug 13, 2026 | $20.2M |
| MILLENNIUM MANAGEMENT LLCinvestment advisor | Aug 14, 2026 | $20.07M |
| WILLIAM BLAIR INVESTMENT MANAGEMENT, LLCinvestment advisor | May 8, 2026 | $19.73M |
| RENAISSANCE TECHNOLOGIES LLCinvestment advisor | Aug 13, 2026 | $19.53M |
| NORTHERN TRUST CORPinvestment advisor | Aug 13, 2026 | $17.04M |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INCinvestment advisor | Aug 14, 2026 | $16.31M |
| Invesco Ltd.holding company | Aug 14, 2026 | $7.92M |
| Massachusetts Financial Services Companyinvestment advisor | Aug 3, 2026 | $7.02M |
| POLEN CAPITAL MANAGEMENT LLCinvestment advisor | Aug 4, 2026 | $6.45M |
| Bank of New York Mellon Corpholding company | Aug 6, 2026 | $5.79M |
| WELLINGTON MANAGEMENT GROUP LLPinvestment advisor | Aug 14, 2026 | $4.75M |
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Source: SEC EDGAR Schedule 13D / 13G and 13F filings.