Mammoth Energy Services TUSK Insider Ownership

NASDAQ TUSK
$3.17 +0.00 (+0.00%)
As of: Sep 10, 2026 · 2:09 PM EDT

Insider Holdings by Owner

23.90Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026
Insider Ownership
44.85%
■0% pp QoQ
Shares Held by Insiders
21.69Mn
filed for Sep 2026
■0.00% QoQ
Shares Outstanding
48.36Mn
48,358,000 shares
Direct Holdings
0
Indirect: 21.69Mn
Net Shares Traded (QoQ)
0
no net change in Sep 2026
Insiders Holding Shares
9
with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding
Latest —
Average ownership —
Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold
Latest quarter —
Net over range —
Buying quarters —

Insider Ownership Summary

Quarter ending 30 Sep, 2026

TUSK's three largest insider shareholders as of September 09, 2026 are Capital Lp Wexford (Director, 21.69Mn shares), Arty Straehla (Chief Executive Officer, 1.01Mn shares), Arty Straehla (Chief Executive Officer, 1.01Mn shares).

Form 4 Holdings

Insiders Holding TUSK

Insiders 9
Shares held 23.90Mn
Of outstanding 49.43%
# Insider Position Direct Indirect Total Share of Insiders Last Filed
1 Capital Lp Wexford Director, TenPercentOwner 0 21,690,075 21,690,075 90.7% 14 Mar, 2024
2 Arty Straehla Chief Executive Officer 1,012,107 0 1,012,107 4.2% 19 Dec, 2023
3 Mark E. Layton Cfo And Secretary 418,985 0 418,985 1.8% 07 Mar, 2023
4 James D Palm Director 240,144 0 240,144 1.0% 14 Jun, 2024
5 Phillip Lancaster Director 159,445 0 159,445 0.7% 01 Jul, 2026
6 Arthur L Smith Director 130,034 0 130,034 0.5% 27 May, 2025
7 Corey J. Booker Director 125,488 0 125,488 0.5% 26 Nov, 2024
8 Arthur H Amron Director 86,256 10,329 96,585 0.4% 22 Jun, 2026
9 Paul M. Jacobi Chief Business Officer 31,067 0 31,067 0.1% 22 Jun, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

262 Insider Transactions

Source SEC Form 4
Latest quarter Sep 2026
Download Data
Date Insider Position Transaction Shares Price Value Shares Held After Ownership
26 Jun, 2026 Phillip Lancaster Director Acquired J 68,152 $0.00 $0 159,445 Direct
17 Jun, 2026 Arthur H Amron Director Acquired J 19,121 $0.00 $0 86,256 Direct
17 Jun, 2026 Charles E Davidson TenPercentOwner Acquired J 2,403,831 $0.00 $0 2,403,831 Direct
17 Jun, 2026 Paul M. Jacobi Chief Business Officer Acquired J 3,211 $0.00 $0 31,067 Direct
17 Jun, 2026 Charles E Davidson TenPercentOwner Acquired J 4,066,610 $0.00 $0 4,066,610 Indirect
17 Jun, 2026 Arthur H Amron Director Acquired J 10,329 $0.00 $0 10,329 Indirect
11 Jun, 2026 Arthur H Amron Director Acquired P 2,500 $3.22 $8.05K 65,135 Direct
12 Jun, 2026 Arthur H Amron Director Acquired P 2,000 $3.28 $6.56K 67,135 Direct
26 May, 2026 Arthur H Amron Director Acquired P 2,500 $3.24 $8.10K 59,635 Direct
28 May, 2026 Arthur H Amron Director Acquired P 3,000 $3.25 $9.75K 62,635 Direct
11 Dec, 2025 Arthur H Amron Director Acquired P 10,000 $1.89 $18.90K 57,135 Direct
22 May, 2025 Arthur L Smith Director Disposed S 20,000 $2.51 $50.20K 130,034 Direct
22 May, 2025 Arthur L Smith Director Disposed S 20,000 $2.51 $50.20K 130,034 Direct
22 May, 2025 Arthur L Smith Director Disposed S 20,000 $2.51 $50.20K 130,034 Direct
22 May, 2025 Arthur L Smith Director Disposed S 20,000 $2.51 $50.20K 130,034 Direct
19 May, 2025 Arthur L Smith Director Disposed S 15,000 $2.49 $37.35K 200,034 Direct
19 May, 2025 Arthur L Smith Director Disposed S 15,000 $2.49 $37.35K 200,034 Direct
19 May, 2025 Arthur L Smith Director Disposed S 15,000 $2.49 $37.35K 200,034 Direct
19 May, 2025 Arthur L Smith Director Disposed S 15,000 $2.49 $37.35K 200,034 Direct
20 May, 2025 Arthur L Smith Director Disposed S 50,000 $2.51 $125.50K 150,034 Direct