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Ownership — AMSC
Institutional Holdings
Insider Transactions
US Institutional Ownership
75.7%
Institution
Shares
Value
Ownership %
Change
Filing Date
BlackRock, Inc.
4.10M
$169.0M
8.45%
+112.7K
2026-06-30
Vanguard Capital Management LLC
2.03M
$84.0M
4.20%
-5.2K
2026-06-30
Barrow Hanley Mewhinney & Strauss LLC
1.70M
$70.0M
3.52%
+564.2K
2026-06-30
UBS Group AG
1.43M
$59.0M
2.95%
+829.3K
2026-06-30
Vanguard Portfolio Management LLC
1.42M
$58.0M
2.93%
-292.8K
2026-06-30
State Street Corp
1.36M
$56.0M
2.80%
+97.2K
2026-06-30
Goldman Sachs Group Inc
1.29M
$53.0M
2.67%
+584.5K
2026-06-30
Geode Capital Management, LLC
1.24M
$51.0M
2.57%
+74.0K
2026-06-30
First Trust Advisors LP
1.17M
$48.0M
2.41%
+390.2K
2026-06-30
Oberweis Asset Management Inc/
987.5K
$40.0M
2.04%
+137.6K
2026-06-30
Jane Street Group, LLC
964.2K
$40.0M
1.99%
+778.6K
2026-06-30
AWM Investment Company, Inc.
951.6K
$39.0M
1.96%
+150.0K
2026-06-30
Baillie Gifford & Co
933.3K
$38.0M
1.93%
-514.1K
2026-06-30
Emerald Advisers, LLC
844.0K
$35.0M
1.74%
+86.6K
2026-06-30
Legal & General Group Plc
756.9K
$31.0M
1.56%
+226.7K
2026-06-30
Dimensional Fund Advisors LP
646.0K
$26.0M
1.33%
-12.3K
2026-06-30
Morgan Stanley
635.8K
$26.0M
1.31%
+2.0K
2026-06-30
Nuveen, LLC
628.4K
$26.0M
1.30%
-392.5K
2026-06-30
Telemark Asset Management, LLC
600.0K
$24.0M
1.24%
--
2026-06-30
Royce & Associates LP
555.8K
$23.0M
1.15%
+13.0K
2026-06-30
Emerald Mutual Fund Advisers Trust
539.0K
$22.0M
1.11%
+100.1K
2026-06-30
Northern Trust Corp
433.8K
$18.0M
0.90%
+40.6K
2026-06-30
Citadel Advisors LLC
429.6K
$17.0M
0.89%
-42.0K
2026-06-30
Ranger Investment Management, L.P.
405.3K
$16.0M
0.84%
--
2026-06-30
Stephens Investment Management Group LLC
402.8K
$16.0M
0.83%
+94.2K
2026-06-30
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