How many institutions held TUSK - MAMMOTH ENERGY SERVICES, INC. - Common Stock, $0.01 par value in Q4 2017?

63 institutional investors reported TUSK - MAMMOTH ENERGY SERVICES, INC. - Common Stock, $0.01 par value for Q4 2017. Use the holders table for investor-level position and value details.

MAMMOTH ENERGY SERVICES, INC. - Common Stock, $0.01 par value (TUSK)

Q: What does CUSIP 56155L108 represent in this 13F holders report?

CUSIP 56155L108 is the security identifier for TUSK - MAMMOTH ENERGY SERVICES, INC. - Common Stock, $0.01 par value used to aggregate holder disclosures.

CUSIP: 56155L108

Q4 2017 13F Holders as of 31 Dec 2017

Type / Class: Equity / Common Stock, $0.01 par value
Shares outstanding: 48,165,948
Total 13F shares: 31,756,632
Share change: -1,149,745
Total reported value: $623,406,658
Price per share: $19.63
Number of holders: 63
Value change: -$22,069,313
Number of buys: 31
Number of sells: 23

Quarterly Holders Quick Answers

What is CUSIP 56155L108?
CUSIP 56155L108 identifies TUSK - MAMMOTH ENERGY SERVICES, INC. - Common Stock, $0.01 par value in SEC institutional holdings data.

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SEC investors directory for manager drilldown.

Explore More Reporting Periods

Jump to adjacent filing periods for faster comparison and easier crawl discovery.

Newer quarter: Q1 2018
Previous quarter: Q3 2017

Recent filing periods for CUSIP 56155L108:

Q1 2026 Q4 2025 Q3 2025 Q2 2025 Q1 2025 Q4 2024 Q3 2024 Q2 2024

Top shareholders of TUSK - MAMMOTH ENERGY SERVICES, INC. - Common Stock, $0.01 par value (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.

Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Holder	Source	Role / Reporting	Ownership %	Shares	Holdings Value	12M Net Δ	As of	Details
WEXFORD CAPITAL LP	13F	Company	52%	25,013,764	$421,732,000	—	30 Sep 2017	13F
JANUS HENDERSON GROUP PLC	13F	Company	6.6%	3,177,245	$53,568,000	—	30 Sep 2017	13F
AMERICAN CENTURY COMPANIES INC	13F	Company	1.6%	747,023	$12,595,000	—	30 Sep 2017	13F
PRINCIPAL FINANCIAL GROUP INC	13F	Company	1.2%	557,277	$9,395,000	—	30 Sep 2017	13F
BlackRock Finance, Inc.	13F	Company	0.97%	464,834	$7,837,000	—	30 Sep 2017	13F
VANGUARD GROUP INC	13F	Company	0.89%	428,194	$7,220,000	—	30 Sep 2017	13F
Cortina Asset Management, LLC	13F	Company	0.56%	268,303	$4,524,000	—	30 Sep 2017	13F
THB ASSET MANAGEMENT	13F	Company	0.46%	223,795	$3,773,000	—	30 Sep 2017	13F
ROYCE & ASSOCIATES LP	13F	Company	0.35%	170,400	$2,873,000	—	30 Sep 2017	13F
Russell Investments Group, Ltd.	13F	Company	0.34%	165,702	$2,794,000	—	30 Sep 2017	13F
Boston Partners	13F	Company	0.31%	148,269	$2,500,000	—	30 Sep 2017	13F
FRANKLIN RESOURCES INC	13F	Company	0.3%	146,600	$2,472,000	—	30 Sep 2017	13F
Ninepoint Partners LP	13F	Company	0.26%	124,245	$2,095,000	—	30 Sep 2017	13F
GEODE CAPITAL MANAGEMENT, LLC	13F	Company	0.25%	122,296	$2,061,000	—	30 Sep 2017	13F
STATE STREET CORP	13F	Company	0.24%	115,146	$1,940,000	—	30 Sep 2017	13F
NORTHERN TRUST CORP	13F	Company	0.2%	97,375	$1,641,000	—	30 Sep 2017	13F
CASTLEARK MANAGEMENT LLC	13F	Company	0.16%	78,378	$1,321,000	—	30 Sep 2017	13F
VICTORY CAPITAL MANAGEMENT INC	13F	Company	0.15%	71,412	$1,204,000	—	30 Sep 2017	13F
PANAGORA ASSET MANAGEMENT INC	13F	Company	0.13%	64,494	$1,087,000	—	30 Sep 2017	13F
QS Investors, LLC	13F	Company	0.09%	43,005	$725,000	—	30 Sep 2017	13F
WELLS FARGO & COMPANY/MN	13F	Company	0.09%	41,203	$695,000	—	30 Sep 2017	13F
SEI INVESTMENTS CO	13F	Company	0.08%	36,875	$622,000	—	30 Sep 2017	13F
TIAA CREF INVESTMENT MANAGEMENT LLC	13F	Company	0.07%	35,004	$590,000	—	30 Sep 2017	13F
Bank of New York Mellon Corp	13F	Company	0.07%	33,597	$567,000	—	30 Sep 2017	13F
CHARLES SCHWAB INVESTMENT MANAGEMENT INC	13F	Company	0.07%	31,400	$530,000	—	30 Sep 2017	13F
Mesirow Financial Investment Management, Inc.	13F	Company	0.06%	28,964	$488,000	—	30 Sep 2017	13F
GOLDMAN SACHS GROUP INC	13F	Company	0.06%	28,101	$474,000	—	30 Sep 2017	13F
KING LUTHER CAPITAL MANAGEMENT CORP	13F	Company	0.05%	24,520	$413,000	—	30 Sep 2017	13F
NORTHPOINTE CAPITAL LLC	13F	Company	0.05%	23,173	$391,000	—	30 Sep 2017	13F
BANK OF AMERICA CORP /DE/	13F	Company	0.05%	23,079	$389,000	—	30 Sep 2017	13F
SIR Capital Management, L.P.	13F	Company	0.05%	21,699	$366,000	—	30 Sep 2017	13F
RENAISSANCE TECHNOLOGIES LLC	13F	Company	0.04%	20,600	$347,000	—	30 Sep 2017	13F
Evercore Wealth Management, LLC	13F	Company	0.04%	20,000	$338,000	—	30 Sep 2017	13F
JPMORGAN CHASE & CO	13F	Company	0.04%	17,500	$296,000	—	30 Sep 2017	13F
Energy Opportunities Capital Management, LLC	13F	Company	0.04%	17,390	$293,000	—	30 Sep 2017	13F
MORGAN STANLEY	13F	Company	0.03%	15,524	$261,000	—	30 Sep 2017	13F
TEACHERS ADVISORS, LLC	13F	Company	0.03%	15,060	$254,000	—	30 Sep 2017	13F
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM	13F	Company	0.03%	13,200	$223,000	—	30 Sep 2017	13F
Swiss National Bank	13F	Company	0.03%	12,500	$211,000	—	30 Sep 2017	13F
CARDINAL CAPITAL MANAGEMENT LLC /CT	13F	Company	0.03%	12,450	$210,000	—	30 Sep 2017	13F
Tower Research Capital LLC (TRC)	13F	Company	0.02%	11,609	$196,000	—	30 Sep 2017	13F
Nationwide Fund Advisors	13F	Company	0.02%	10,076	$170,000	—	30 Sep 2017	13F
BlueCrest Capital Management Ltd	13F	Company	0.02%	10,000	$169,000	—	30 Sep 2017	13F
DEUTSCHE BANK AG\	13F	Company	0.02%	7,481	$125,000	—	30 Sep 2017	13F
NEW YORK STATE COMMON RETIREMENT FUND	13F	Company	0.01%	6,400	$108,000	—	30 Sep 2017	13F
AMERICAN INTERNATIONAL GROUP, INC.	13F	Company	0.01%	5,396	$91,000	—	30 Sep 2017	13F
MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC	13F	Company	0.01%	2,500	$42,000	—	30 Sep 2017	13F
MANUFACTURERS LIFE INSURANCE COMPANY, THE	13F	Company	0%	1,377	$23,000	—	30 Sep 2017	13F
ROYAL BANK OF CANADA	13F	Company	0%	1,239	$20,000	—	30 Sep 2017	13F
Legal & General Group Plc	13F	Company	0%	1,192	$20,000	—	30 Sep 2017	13F

Institutional Holders of MAMMOTH ENERGY SERVICES, INC. - Common Stock, $0.01 par value (TUSK) as of Q4 2017

As of 31 Dec 2017, MAMMOTH ENERGY SERVICES, INC. - Common Stock, $0.01 par value (TUSK) was held by 63 institutional shareholders that filed Form 13F with the SEC. Together, they reported ownership of 31,756,632 shares. The largest 10 holders included Wexford Capital LP, JANUS HENDERSON GROUP PLC, PRINCIPAL FINANCIAL GROUP INC, BlackRock Inc., Vanguard Group Inc, Cortina Asset Management, LLC, THOMSON HORSTMANN & BRYANT INC, ROYCE & ASSOCIATES LP, Russell Investments Group, Ltd., and Boston Partners. This page lists 63 institutional shareholders reporting positions in this security for the Q4 2017 filing period.

Investor	Option	Weight %	Change %	Value $	* Price	Shares	Share Change	Activity	Report Period

Compare Q4 2017 vs Q3 2017 Across Filers

Q3 2017 holders

Q4 2017 holders

Holder diff

Investor	Q3 2017 Shares	Q4 2017 Shares	Share Diff	Share Chg %	Q3 2017 Value $	Q4 2017 Value $	Value Diff $	Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend

Quarterly Value Trend

Quarterly Shares Trend

* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.