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Business Summary
Filings
Ownership
Valuation
Ownership — AMPX
Institutional Holdings
Insider Transactions
US Institutional Ownership
77.6%
Institution
Shares
Value
Ownership %
Change
Filing Date
BlackRock, Inc.
11.34M
$157.0M
7.76%
+2.11M
2026-06-30
JANE STREET GROUP, LLC
9.33M
$129.0M
6.39%
+2.76M
2026-06-30
VANGUARD CAPITAL MANAGEMENT LLC
5.56M
$77.0M
3.81%
+654.1K
2026-06-30
UBS Group AG
5.37M
$74.0M
3.68%
+2.46M
2026-06-30
CITADEL ADVISORS LLC
5.27M
$73.0M
3.61%
+1.05M
2026-06-30
MORGAN STANLEY
5.11M
$70.0M
3.49%
+1.94M
2026-06-30
Point72 Asset Management, L.P.
4.38M
$60.0M
3.00%
+2.91M
2026-06-30
TWO SIGMA INVESTMENTS, LP
4.32M
$59.0M
2.96%
--
2026-06-30
GEODE CAPITAL MANAGEMENT, LLC
3.52M
$48.0M
2.41%
+706.1K
2026-06-30
STATE STREET CORP
3.24M
$44.0M
2.22%
+527.7K
2026-06-30
GOLDMAN SACHS GROUP INC
2.54M
$35.0M
1.74%
+316.1K
2026-06-30
JUPITER ASSET MANAGEMENT LTD
2.13M
$29.0M
1.46%
+1.17M
2026-06-30
LMR Partners LLP
1.75M
$24.0M
1.20%
--
2026-06-30
PRICE T ROWE ASSOCIATES INC /MD/
1.64M
$22.0M
1.12%
-261.5K
2026-06-30
D. E. Shaw & Co., Inc.
1.54M
$21.0M
1.05%
+411.4K
2026-06-30
VANGUARD PORTFOLIO MANAGEMENT LLC
1.46M
$20.0M
1.00%
+384.2K
2026-06-30
MILLENNIUM MANAGEMENT LLC
1.45M
$20.0M
0.99%
+287.8K
2026-06-30
Hood River Capital Management LLC
1.41M
$19.0M
0.97%
+463.4K
2026-06-30
RENAISSANCE TECHNOLOGIES LLC
1.41M
$19.0M
0.96%
+1.05M
2026-06-30
Driehaus Capital Management LLC
1.35M
$18.0M
0.92%
-2.45M
2026-06-30
Baird Financial Group, Inc.
1.32M
$18.0M
0.91%
-260.2K
2026-06-30
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND
1.25M
$17.0M
0.85%
--
2026-06-30
NORTHERN TRUST CORP
1.23M
$17.0M
0.84%
+207.0K
2026-06-30
DEUTSCHE BANK AG\
1.20M
$16.0M
0.82%
+321.2K
2026-06-30
Sixth Street Partners Management Company, L.P.
1.18M
$16.0M
0.81%
--
2026-06-30
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