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Mammoth Energy Services
TUSK

Name Holding Trade Value Shares
Change 		Change in
Stake
Wexford Capital
1
Wexford Capital
Florida
$311M +$302M +20,443,903 New
Perkins Investment Management
2
Perkins Investment Management
Illinois
$39.3M +$38.2M +2,585,354 New
American Century Companies
3
American Century Companies
Missouri
$9.8M +$9.49M +641,765 New
Principal Financial Group
4
Principal Financial Group
Iowa
$9.12M +$8.87M +599,787 New
Pine River Capital Management
5
Pine River Capital Management
Minnesota
$7.83M +$7.62M +515,000 New
UBS O'Connor
6
UBS O'Connor
Illinois
$5.78M +$5.62M +380,285 New
Vanguard Group
7
Vanguard Group
Pennsylvania
$4.92M +$4.79M +323,961 New
Driehaus Capital Management
8
Driehaus Capital Management
Illinois
$4.45M +$4.33M +292,731 New
Franklin Resources
9
Franklin Resources
California
$4.1M +$3.99M +270,000 New
BlackRock Fund Advisors
10
BlackRock Fund Advisors
California
$3.56M +$3.47M +234,343 New
Laurion Capital Management
11
Laurion Capital Management
New York
$3.04M +$2.96M +200,000 New
Millennium Management
12
Millennium Management
New York
$2.49M +$2.42M +163,874 New
Spark Investment Management
13
Spark Investment Management
New York
$2.14M +$2.09M +141,100 New
Russell Investments Group
14
Russell Investments Group
United Kingdom
$1.53M +$1.51M +102,246 New
Omega Advisors
15
Omega Advisors
New York
$1.52M +$1.48M +100,000 New
Geode Capital Management
16
Geode Capital Management
Massachusetts
$1.49M +$1.45M +98,311 New
NC
17
Nokomis Capital
Texas
$1.41M +$1.37M +92,696 New
Northern Trust
18
Northern Trust
Illinois
$1.4M +$1.37M +92,425 New
Numeric Investors
19
Numeric Investors
Massachusetts
$1.36M +$1.32M +89,210 New
Oceanic Investment Management
20
Oceanic Investment Management
Isle Of Man
$1.21M +$1.18M +79,658 New
State Street
21
State Street
Massachusetts
$1.12M +$1.09M +73,921 New
Cardinal Capital Management LLC (Connecticut)
22
Cardinal Capital Management LLC (Connecticut)
Connecticut
$1.05M +$1.02M +69,110 New
BlackRock Institutional Trust
23
BlackRock Institutional Trust
California
$1.05M +$1.02M +68,811 New
Peregrine Capital Management
24
Peregrine Capital Management
Minnesota
$829K +$807K +54,527 New
Boston Partners
25
Boston Partners
Massachusetts
$724K +$704K +47,600 New
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