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Business Summary
Filings
Ownership
Valuation
Ownership — TUSK
Institutional Holdings
Insider Transactions
US Institutional Ownership
53.9%
Institution
Shares
Value
Ownership %
Change
Filing Date
WEXFORD CAPITAL LP
12.07M
$39.0M
25.08%
-10.00M
2026-06-30
ADAGE CAPITAL PARTNERS GP, L.L.C.
4.58M
$14.0M
9.51%
--
2026-06-30
VANGUARD CAPITAL MANAGEMENT LLC
1.06M
$3.0M
2.20%
+240.5K
2026-06-30
Peapod Lane Capital LLC
807.8K
$2.0M
1.68%
+208.0K
2026-06-30
DIMENSIONAL FUND ADVISORS LP
691.7K
$2.0M
1.44%
+5.5K
2026-06-30
CITADEL ADVISORS LLC
593.3K
$1.0M
1.23%
+251.3K
2026-06-30
JANE STREET GROUP, LLC
506.7K
$1.0M
1.05%
+471.9K
2026-06-30
BlackRock, Inc.
408.0K
$1.0M
0.85%
-1.05M
2026-06-30
MARSHALL WACE, LLP
395.6K
$1.0M
0.82%
+364.8K
2026-06-30
Johns Hopkins University
387.4K
$1.0M
0.80%
--
2026-06-30
BRIDGEWAY CAPITAL MANAGEMENT, LLC
332.3K
$1.0M
0.69%
--
2026-06-30
Russell Investments Group, Ltd.
329.8K
$1.0M
0.69%
+261.8K
2026-06-30
GEODE CAPITAL MANAGEMENT, LLC
306.0K
--
0.64%
-304.9K
2026-06-30
RENAISSANCE TECHNOLOGIES LLC
292.3K
--
0.61%
+60.3K
2026-06-30
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP
290.1K
--
0.60%
--
2026-06-30
Empowered Funds, LLC
241.3K
--
0.50%
--
2026-06-30
AQR CAPITAL MANAGEMENT LLC
177.8K
--
0.37%
+111.1K
2026-06-30
VANGUARD FIDUCIARY TRUST CO
161.8K
--
0.34%
-8.3K
2026-06-30
Round Rock Advisors LLC
152.8K
--
0.32%
--
2026-06-30
MORGAN STANLEY
133.6K
--
0.28%
-19.2K
2026-06-30
Centiva Capital, LP
130.9K
--
0.27%
+19.8K
2026-06-30
GSA CAPITAL PARTNERS LLP
129.5K
--
0.27%
+115.6K
2026-06-30
MILLENNIUM MANAGEMENT LLC
124.2K
--
0.26%
+102.3K
2026-06-30
Marquette Asset Management, LLC
109.8K
--
0.23%
--
2026-06-30
STIFEL FINANCIAL CORP
105.6K
--
0.22%
--
2026-06-30
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