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TUSK · Mammoth Energy Services, Inc. · Holdings

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$2.69 -0.01 (-0.37%) At close · Oct 20
Market Cap
$127.06M
Shares
48.13M
Volume · Oct 20 71.91K Avg daily vol (3M) 143.22K

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Institutional holdings are being reconciled with SEC filings. Holder totals and changes may be incomplete until reconciliation finishes.
The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.
Holders: 88
Total Value: $84,574,086
Total Shares: 26,022,812

Institutional Ownership Trend

27 quarters

Holder Concentration

Across 93 13F filers
Top Holder
46.1%
Sep 2023 → Jun 2026 · range 46.1% – 64.3%
of institutional value
Top 5
73.3%
Sep 2023 → Jun 2026 · range 73.3% – 86.9%
of institutional value
Top 10
82.0%
Sep 2023 → Jun 2026 · range 82.0% – 94.9%
of institutional value
HHI
2,487
Sep 2023 → Jun 2026 · range 2,487 – 4,352
Moderately concentrated

Who Holds TUSK

Last 8 quarters through Sep 30, 2026 (filing window open)

Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.

Jun 30, 2026, the newest closed quarter: 93 filers, like-for-like change -25.6%; actively managed books -23.1%; index-like books -43.8%.

Holder type Share Filers Change
Registered adviser 85.6% 48 -29.1%
Exempt adviser 1.7% 2 new
Bank 1.5% 11 -50.7%
Broker-dealer 0.0% 1 new
Non-US 0.4% 2 +451.8%
Holding company 2.5% 6 -66.9%
Adviser 0.0% 0 —
Benefit plan 0.0% 0 —
Insurer 0.0% 0 —
Unknown 8.2% 23 +177.9%

The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.

How the mix is measured

Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.

Excluded 1 holder with no observed 2026-06-30 13F.

Conviction and Crowding

93 13F filers, quarter ended Jun 30, 2026

Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.

Conviction holders
2
2.15% of filers hold it in their top 10
Mar 31, 2026: 1
Holders above 5%
1
median weight 0.000%
Mar 31, 2026: 1
Crowding
43.6%
of shares outstanding, 95th percentile
Mar 31, 2026: 60.1%
Private-fund advisers
41.9%
of shares outstanding
Institutional ownership
54.1%
63.3% of the estimated free float
Top 10 holders
81.9%
of 13F shares, Herfindahl 0.251
Active holders
-23.1%
like-for-like share change of active filers
5% stakes on record
3
0 13D, 3 13G (0 institutional, 2 passive, 1 exempt)
How long holders have held it value-weighted 18.4 quarters
Under 1 year 17.7% 1 to 3 years 8.11% 3 years or more 74.2% Since coverage start 0.000%

Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).

Estimated Holder Cost Basis

Quarter ended Jun 30, 2026, on that quarter's share basis

Estimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.

Estimated avg cost
$2.89
estimated per share
Mar 31, 2026: $2.89
Quarter-end price
$3.25
implied by 13F values
Estimated gain or loss
+12.6%
price against the estimated cost
Estimated at a loss
3.62%
of costed 13F value

Estimated cost covers 40.1% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.

Shared Holders

Companies TUSK's active holders also own, quarter ended Jun 30, 2026
# Company Shared holders
1 APH Amphenol Corp /De/ 3
2 AMZN Amazon Com Inc 4
3 MSFT Microsoft Corp 4
4 GOOGL Alphabet Inc. 4
5 LLY ELI LILLY & Co 3
6 AVGO Broadcom Inc. 3
7 META Meta Platforms, Inc. 3
8 NVDA Nvidia Corp 3

Shareholder Targets

13F filers that own its peers but not TUSK, quarter ended Jun 30, 2026

Found through its holder-overlap peers: APH, AMZN, MSFT, GOOGL, LLY, AVGO, META, NVDA. 7,025 filers in all.

# Filer In peers
1 VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser, Diversified active $365,757,983,153 8 held
2 NORGES BANK Non-US, Index-like $256,274,073,204 8 held
3 PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser, Diversified active $254,996,025,326 8 held
4 Invesco Ltd. Adviser, Diversified active $248,754,173,367 8 held
5 Capital Research Global Investors Adviser, Diversified active $244,495,276,723 8 held
6 Capital World Investors Adviser, Diversified active $190,370,383,678 8 held
7 Capital International Investors Adviser, Diversified active $136,526,020,997 8 held
8 Legal & General Group Plc Unknown, Index-like $115,774,427,616 8 held
9 LILLY ENDOWMENT INC Unknown, Unknown $108,400,867,760 1 held
10 Nuveen, LLC Unknown, Index-like $105,784,444,477 8 held

Fund Ownership of TUSK by Fund Type

Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026

Index funds and index ETFs hold 3.96% of shares outstanding.

Fund type Of shares outstanding Shares
Index funds 1.29% 622,773
Index ETFs 2.67% 1,284,633
Active ETFs 0.90% 435,521
Active funds 1.59% 764,172
Unclassified 0.01% 3,873
All registered funds 6.46% 3,110,972
How fund types are measured

Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.

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Holder Value (USD) % of 13F Shares Open
Key facts CIK 1679268 CUSIP 56155L108 13F (30d) 4 filings 4 filers Visit website Investor relations