WAVEMAN · COMPANY

TUSK · Mammoth Energy Services, Inc.

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TEAM-2.62% 13F +440META+1.00% 13F +2,694RCG+0.35% CLUSTERUTHR-0.54% 13F +425CRWV+5.68% 13F +694CRM-1.97% 13F +1,019CVNA+1.58% 13F +795TPL-1.11% 13F +444NET-1.96% 13F +711MSTR-1.39% 13F +527DELL+1.50% 13F +1,204CRWD-0.87% 13F +1,383ANET+1.22% 13F +1,324COIN-4.18% 13F +475TEAM-2.62% 13F +440META+1.00% 13F +2,694RCG+0.35% CLUSTERUTHR-0.54% 13F +425CRWV+5.68% 13F +694CRM-1.97% 13F +1,019CVNA+1.58% 13F +795TPL-1.11% 13F +444NET-1.96% 13F +711MSTR-1.39% 13F +527DELL+1.50% 13F +1,204CRWD-0.87% 13F +1,383ANET+1.22% 13F +1,324COIN-4.18% 13F +475

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TUSK

Name: MAMMOTH ENERGY SERVICES, INC. (TUSK) insider trading and ownership data
Creator: WaveMan
License: https://wave-man.com/terms

MAMMOTH ENERGY SERVICES, INC.

ENERGY · OIL & GAS FIELD SERVICES, NEC · CIK 0001679268

C-SUITE BUYING · 1☆ WATCH

INSIDER NET · 180D

$10.5M

open-market buys minus sells, Form 4 codes P and S

INSIDER BUYERS · 180D

CONGRESS BUYERS · 1Y

FUNDS ADDED · QTR

13F, latest reported quarter

REVENUE GROWTH

-2.9%

XBRL, annual

NET MARGIN

10.4%

SEVEN FACTS, RANKED AGAINST THE SECTOR · RANK IS NOT A FORECAST

INSIDERS

net +$10.5M over 180 days

+$10.5M over 90 days · +$10.5M of it by a 10%+ holder

more than 98% of Energy

CONGRESS

no member of Congress has reported trading it

FUNDS

62 funds added or opened last quarter

below 78% of Energy

REVENUE

-2.9% year over year

below 53% of Energy

MARGIN

10.4% net margin

more than 66% of Energy

BUYBACKS

$534.0K repurchased, FY to 2026-06-30

below 84% of Energy

SHORT

no short interest reported

THE SITUATION · EVERY LINE IS ONE RULE OVER ONE DATASET

62 funds added or opened positions in the latest 13F quarter, of 96 holders.

The year, with the filings on it

Total return indexed to 100 over the last 12 months · every marker is a federal filing, placed at its date — hover any marker for the detail

TOTAL 12M RETURN +32.2%

+32.2%12M

INSIDER BUY

INDEXED RETURN, DIVIDEND-ADJUSTED — NOT A PRICE CHART · LARGE TRADES DRAWN FIRST WHEN A NAME FILES HEAVILY

Live price

Daily candles from TradingView, on their licence — no filings are marked on this one

WHY THIS NAME IS ON THE DESK

Insiders are net buyers of their own stock.

The record shows a net $10.5M bought by insiders over 180 days, 62 funds added last quarter. Every figure is a federal filing, dated the day it became public.

Backtest this pattern Open the screener

Same sector, ranked by filing activity

Sector from the SEC's own SIC classification

METC AMR PBF GULTU PRT CRC REPX DMLP CVX PARR TALO DKL

Insider transactions

Form 4 purchases and sales (codes P and S) — grants, option exercises and preferred conversions excluded

Over the last 180 days, MAMMOTH ENERGY SERVICES, INC. insiders bought a net $10.5M of stock across 38 Form 4 purchases and sales, with 2 insider(s) buying. Source: SEC Form 4 filings, as of 2026-09-06.

INSIDER

FILED

VALUE

Wexford GP LLC

Chief Business Officer

BUY

2026-06-17

4,019,574.0

$10.5M

Amron Arthur H

Director

BUY

2026-06-12

2,000.0

$6.6K

Amron Arthur H

Director

BUY

2026-06-11

2,500.0

$8.1K

Amron Arthur H

Director

BUY

2026-05-28

3,000.0

$9.8K

Amron Arthur H

Director

BUY

2026-05-26

2,500.0

$8.1K

38 TRANSACTIONS ON RECORD

Showing the most recent few. Create a free account to see 33 more transactions on record, the cross-source screener and CSV export. We store only your email address, and there is no password to create.

Institutional holders

13F · holdings as of the latest quarter funds have reported

WEXFORD CAPITAL LP

12,071,823.0 sh

$39.2M

ADAGE CAPITAL PARTNERS GP, L.L.C.

4,575,000.0 sh

$14.9M

VANGUARD CAPITAL MANAGEMENT LLC

1,059,603.0 sh

$3.4M

Peapod Lane Capital LLC

807,804.0 sh

$2.6M

DIMENSIONAL FUND ADVISORS LP

691,667.0 sh

$2.2M

SCHEDULE 13D/G

No 5%+ ownership filings

Nobody has crossed 5% with a filing obligation. Absence is a fact here, not missing data.

FORM 144

No planned-sale notices

No insider has notified an intent to sell. This is the panel to watch after a run-up.

Fund concentration

N-PORT · funds ranked by how much of THEMSELVES they put in this stock — the conviction number 13F cannot show

Dunham Small Cap Value Fund

$206.0K POSITION · AS OF 2026-04-30

0.2%

Ultra-Small Company Market Fund

$147.0K POSITION · AS OF 2026-03-31

0.1%

Small Company Value Portfolio

$21.4K POSITION · AS OF 2026-03-31

0.1%

U.S. Small Cap Equity Fund

$310.1K POSITION · AS OF 2026-04-30

0.0%

EA Bridgeway Omni Small-Cap Value ETF

$591.2K POSITION · AS OF 2026-03-31

0.0%

SIMT Small Cap Fund

$123.0K POSITION · AS OF 2026-03-31

0.0%

SEC N-PORT, MONTHLY WITH A ~60-DAY PUBLIC LAG · FUNDS ≥ $10M · % = SHARE OF THE FUND'S OWN BOOK

Fundamentals

Annual figures from XBRL filings · pick a past date to see them exactly as the market knew them then — restatements and all

	2025-12	2024-12	2023-12	2022-12
REVENUE	$44.3M	$45.6M	$309.5M	$362.1M
OPERATING INCOME	$-57.4M	$-120.4M	$-16.7M	$-16.4M
NET INCOME	$4.6M	$-207.3M	$-3.2M	$-619.0K
EPS (DILUTED)	0.10	-4.31	-0.07	-0.01
OPERATING CASH FLOW	$-18.6M	$180.7M	$31.4M	$15.3M
CASH	$102.0M	$60.8M	$16.6M	$17.3M
LONG-TERM DEBT	—	$0	$42.8M	$0

SEC XBRL · FISCAL-YEAR PERIODS · AS KNOWN ON 2026-09-06 · NOBODY ELSE SHOWS FUNDAMENTALS AS OF A PAST DATE