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TUSK · Mammoth Energy Services, Inc.
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TUSK Mammoth Energy Services (TUSK) Insider Trading, Ownership & Congress Trades

Energy · Oil & gas field services, nec · CIK 0001679268
Quote by TradingView
Cluster · 3 insidersC-suite buying · 1
House members buying, 1 year
0
STOCK Act, US House only, disclosed up to 45 days after the trade
Funds added, last quarter
61
13F, latest reported quarter

What the filings say about TUSK

Insiders, 180 days
+$10.5M net bought
3 buyers

Mammoth Energy Services insider trades (Form 4)

Form 4 buys and sells (codes P and S). Grants, option exercises and conversions excluded.

Over the last 180 days, MAMMOTH ENERGY SERVICES, INC. insiders bought a net $10.5M of stock across 39 Form 4 purchases and sales, with 3 insiders buying. Source: SEC Form 4 filings, as of 2026-10-28.

Insider
Filed
Shares
Value
Since filing
Plaumann Mark Lawrence
Director
BUY
2026-09-17 SECtraded 2026-09-16
5,000
$15.0K
-11.2%
Context
  • First Form 4 purchase or sale (code P or S) here by this insider on our record.
  • The trade is 100.0% of the 5,000 shares held after it.
  • No other insider bought within 30 days.
  • 61 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Director Plaumann Mark Lawrence bought about $15.0K of TUSK on Sep 16, 2026; 61 funds added in the latest 13F quarter.
Wexford GP LLC
Chief Business Officer
BUY
2026-06-22 SECtraded 2026-06-17
4,019,574
$10.5M
-7.7%
Context
  • 3 earlier Form 4 trades (code P or S) here by this insider (3 buys), the last on Jun 10, 2022.
  • +78.0% median (+78.8% mean) 90-day return after 3 previous buys.
  • The trade is 37.8% of the 10,620,789 shares held after it.
  • 1 other insider bought within 30 days.
  • 61 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Chief Business Officer Wexford GP LLC bought about $10.5M of TUSK on Jun 17, 2026, the largest insider purchase at the company on our record; 1 other insider bought within 30 days and 61 funds added in the latest 13F quarter.
Amron Arthur H
Director
BUY
2026-06-15 SECtraded 2026-06-12
2,000
$6.6K
-8.9%
Context
  • 8 earlier Form 4 trades (code P or S) here by this insider (8 buys), the last on Jun 11, 2026.
  • -1.1% median (-1.6% mean) 90-day return after 8 previous buys.
  • The trade is 3.0% of the 67,135 shares held after it.
  • 1 other insider bought within 30 days.
  • 61 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Director Amron Arthur H bought about $6.6K of TUSK on Jun 12, 2026; 1 other insider bought within 30 days and 61 funds added in the latest 13F quarter.
Amron Arthur H
Director
BUY
2026-06-15 SECtraded 2026-06-11
2,500
$8.1K
-8.9%
Context
  • 7 earlier Form 4 trades (code P or S) here by this insider (7 buys), the last on May 28, 2026.
  • -1.6% median (-1.8% mean) 90-day return after 7 previous buys.
  • The trade is 3.8% of the 65,135 shares held after it.
  • 1 other insider bought within 30 days.
  • 61 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Director Amron Arthur H bought about $8.1K of TUSK on Jun 11, 2026; 1 other insider bought within 30 days and 61 funds added in the latest 13F quarter.
Amron Arthur H
Director
BUY
2026-05-28 SEC
3,000
$9.8K
-15.7%
Context
  • 6 earlier Form 4 trades (code P or S) here by this insider (6 buys), the last on May 26, 2026.
  • +0.3% median (-1.7% mean) 90-day return after 6 previous buys.
  • The trade is 4.8% of the 62,635 shares held after it.
  • 1 other insider bought within 30 days.
  • 61 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Director Amron Arthur H bought about $9.8K of TUSK on May 28, 2026; 1 other insider bought within 30 days and 61 funds added in the latest 13F quarter.
39 transactions on record
Since filing: total return from the first close after the filing to the latest close, dividend-adjusted. Not a forecast.
Context lines are counts over the filings above and returns from our own price history, never a price level. Not investment advice.
See all insider buying · insider selling
Showing the latest few. to see 34 more transactions and use the screener and CSV export. We store only your email; there is no password.
Seven facts, ranked against the sector · Rank is not a forecast
Insiders
net +$10.5M over 180 days
+$15.0K over 90 days · +$10.5M of it by a 10%+ holder
more than 97% of Energy
Congress
no House purchase disclosed in the last 12 months
Funds
61 funds bought in last quarter
below 77% of Energy
Revenue
-2.9% year over year
below 54% of Energy
Margin
10.4% net margin
more than 65% of Energy
Buybacks
$534.0K repurchased, FY to 2026-06-30
below 84% of Energy
Short interest
0.3% of the float short (float per yahoo 2026-10-27) · 1.2 days to cover · settled 2026-10-15
below 94% of Energy
What changed in the last 30 days
Nothing new filed in the last 30 days

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The year, with the filings on it
Total return over 12 months. Each marker is a filing; hover or tap one for the detail.
+30.2%12M
-20%+12%+45%+77%2025-102025-122026-022026-042026-062026-082026-10 2026-06-17 · Wexford GP LLC bought $10.5M2025-12-11 · Amron Arthur H bought $18.9K2026-09-16 · Plaumann Mark Lawrence bought $15.0K2026-05-28 · Amron Arthur H bought $9.8K2026-05-26 · Amron Arthur H bought $8.1K2026-06-11 · Amron Arthur H bought $8.1K2026-06-12 · Amron Arthur H bought $6.6K
Insider buy
Indexed to 100, dividend-adjusted, not a price chart. When a name files heavily, the largest trades are drawn first.

Who owns TUSK: institutional holders (13F)

13F holdings, latest reported quarter
WEXFORD CAPITAL LP
12,071,823 sh
$39.2M
ADAGE CAPITAL PARTNERS GP, L.L.C.
4,575,000 sh
$14.9M
VANGUARD CAPITAL MANAGEMENT LLC
1,059,603 sh
$3.4M
Peapod Lane Capital LLC
807,804 sh
$2.6M
DIMENSIONAL FUND ADVISORS LP
691,667 sh
$2.2M

Congress trades in TUSK

No Congress trades reported
No House member has disclosed a trade in this stock. See what Congress is buying.

Activist and 5% holders (13D/13G)

No 5%+ ownership filings
Nobody has filed for crossing 5%. That is a fact, not missing data.

TUSK planned insider sales (Form 144)

No planned-sale notices
No insider has filed to sell. Watch this after a run-up.

TUSK mutual fund holders (N-PORT)

Funds ranked by the share of their own portfolio in this stock (N-PORT).
Dunham Small Cap Value Fund
$241.9K position · as of 2026-07-31
0.3%
Ultra-Small Company Market Fund
$195.0K position · as of 2026-06-30
0.1%
SIIT SMALL CAP FUND
$103.5K position · as of 2026-05-31
0.1%
SIIT SMALL CAP II FUND
$97.5K position · as of 2026-05-31
0.0%
U.S. Small Cap Equity Fund
$369.7K position · as of 2026-07-31
0.0%
U.S. Small Cap Equity Fund
$82.6K position · as of 2026-06-30
0.0%
SEC N-PORT, monthly, about 60 days late · funds ≥ $10M · % is the share of the fund's own portfolio
Live price
Daily candles from TradingView, under their licence. No filings marked.
Why this name is on the desk
3 insiders reported buying shares.
The record shows a net $10.5M bought by insiders over 180 days, 61 funds added last quarter. Each figure is a federal filing, dated the day it went public.
Backtest this pattern Open the screener
Same sector, ranked by filing activity
Sector by SEC SIC code
METCAMRPBFGULTUPRTCRCREPXCVXDMLPTALOPARRDKL

TUSK financials

Revenue growth
-2.9%
XBRL, annual
Net margin
10.4%
Ratios from the company's XBRL filings, latest filings
Revenue, TTM
n/a
the filed year and its quarters do not reconcile, so the trailing figure is withheld
Net margin, TTM
n/a
the filed year and its quarters do not reconcile, so the trailing figure is withheld
Free cash flow, TTM
-$117.7M
operating cash flow minus capex, 2025-07-01 to 2026-06-30
Debt to equity
0.00x
long-term 2024-12-31 (18 months older than the period end) plus current 2024-12-31 (18 months older than the period end); equity 2026-06-30
Cash flow to debt
n/a
no debt to cover
Return on equity
+0.3%
TTM net income over average of 2025-06-30 and 2026-06-30
Return on assets
+0.2%
TTM net income over average of 2025-06-30 and 2026-06-30
Return on invested capital
n/a
the filed year and its quarters do not reconcile, so the trailing figure is withheld
Return on capital employed
n/a
the filed year and its quarters do not reconcile, so the trailing figure is withheld
P/E, trailing
94.17x
close 2026-10-27 over four quarters of diluted EPS, 2025-07-01 to 2026-06-30
Enterprise value
$85.1M
market value at close 2026-10-27 on 2026-08-04 shares, plus long-term 2024-12-31 (18 months older than the period end) plus current 2024-12-31 (18 months older than the period end), minus cash 2026-06-30
FCF yield
-86.5%
TTM free cash flow over market value at close 2026-10-27
PEG, trailing
n/a
prior-year trailing EPS was a loss, growth undefined
Price as of 2026-10-27. Hover or tap a tile for its yearly and quarterly history.
Method
TTM is four consecutive fiscal quarters; Q4 is the year minus nine months when not filed. Returns use the average of opening and closing balances. EBIT is approximated by operating income. PEG uses trailing EPS growth.
Fundamentals
Annual figures from XBRL filings. Pick a past date to see them as known then.
2025-122024-122023-122022-12
Revenue$44.3M$187.9M$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 debtn/a$0$42.8M$0
SEC XBRL, fiscal years, as known on 2026-10-28

TUSK Stock Sonar score 6/7 axes

Find similar shapesCompare

TUSK ranks highest on financial health (99th percentile) and insider conviction (91st), and lowest on growth (24th), among Energy peers.

ProfitHealthGrowthInsidersInstitutionsRisk
Profitability
39
Inputs
  • Return on equity+0.3% · 39 pct, sector of 109
  • Return on assets+0.2% · 40 pct, sector of 129
  • Return on invested capitalthe filed year and its quarters do not reconcile, so the trailing figure is withheld
  • Return on capital employedthe filed year and its quarters do not reconcile, so the trailing figure is withheld
Financial health
100
Inputs
  • Debt to equity0.00x · 100 pct, sector of 111
  • Cash flow to debtno debt to cover
Growth
24
Inputs
  • Revenue growth, YoY-2.9% · 46 pct, sector of 141
  • Backlog growth, YoY-89.9% · 2 pct, universe of 855
Insider conviction
91
Inputs
  • Net Form 4 buying (codes P and S), 180d$10.5M · 97 pct, sector of 95
  • Insider buyers, 180d3 · 86 pct, sector of 95
Institutional and government
45
Inputs
  • Funds adding, latest quarter61 · 23 pct, sector of 145
  • Congress net buyers, 365dno Congress trades in 365 days
  • Federal contracts, 180dno federal contracts in 180 days
  • Lobbying spend, 4 quarters$440K · 67 pct, sector of 37
Risk and compliance
90
Inputs
  • Short interest, % of float+0.3% · 93 pct, sector of 168
  • Recalls per $1B revenue, 3yrevenue under $50M or not filed, so a count cannot be scaled to size
  • EPA cases per $1B revenue, 5yrevenue under $50M or not filed, so a count cannot be scaled to size
  • New text in Risk Factors, latest 10-K+4.9% · 87 pct, sector of 120
1 not measured: US patents
  • US patents needs 1 of 2 inputs, 0 present: patent data not loaded yet

6 of 7 axes scored. Each is a percentile against sector peers (all companies when the sector is thin); higher is better. An unscored axis is unmeasured, not low. How it is scored

TUSK filings, in plain words

Are Mammoth Energy Services insiders buying or selling TUSK?

In the 180 days to 2026-10-28, Mammoth Energy Services insiders were net buyers, a net $10.5M across purchases and sales reported on Form 4, by 3 buyers.

Read the full summary

In the 180 days to 2026-10-28, Mammoth Energy Services insiders were net buyers of TUSK, a net $10.5M across purchases and sales reported on Form 4 by 3 buyers. Most of that figure, $10.5M, came from a holder of 10% or more rather than an officer or director. 3 insiders reported purchases in that window. Each figure is counted from SEC and House filings as of 2026-10-28, dated the day the filing was made public.

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