Security key
56155L108
MAMMOTH ENERGY SERVICES, INC. - Common Stock, $0.01 par value (TUSK)
CUSIP: 56155L108
Q4 2025 13F Holders as of 31 Dec 2025
- Security type / class
- Equity / Common Stock, $0.01 par value
- Total 13F shares
- 34,368,035
- Total 13F value
- $63,578,088
- Share change
- -1,694,690
- SEC-reported price per share
- $1.85
- Number of holders
- 71
- Value change
- -$3,324,682
- Number of buys
- 30
- Number of sells
- 40
- Shares outstanding
- 48,179,010
Holder snapshot
6 signals
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q4 2025
Institutions
71
Top holders
10
TUSK full security history
Ownership snapshot
Full 13F holder table
Newer quarter: Q2 2026
MAMMOTH ENERGY SERVICES, INC. SEC filings
MAMMOTH ENERGY SERVICES, INC. company facts
Broader feeds
Reporting periods
Holder history for CUSIP 56155L108
Recent filing periods:
Ownership snapshot
Top reported holders 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. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
VALUEWORKS LLC
Disclosed value leader
WEXFORD CAPITAL LP
Comparable rows
15/15
Latest evidence
30 Sep 2025
13D/G
13F
3/4/5
Lead comparable stake: 5%
13D/G row: VALUEWORKS LLC
Showing 1-6 of 15 holder rows.
Quick read
VALUEWORKS LLC leads the comparable SEC ownership view at 5%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens VALUEWORKS LLC's linked filing trail.
Comparable ownership
Top 5
VALUEWORKS LLC
5%
Arthur L. Smith
0.27%
WEXFORD CAPITAL LP
46%
ADAGE CAPITAL PARTNERS GP, L.L.C.
9.5%
BlackRock, Inc.
3%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| VALUEWORKS LLC |
13D/G
13F
Company
|
5%
|
$6,689,287
2,389,031 shares
|
$0 | 30 Jun 2025 |
| Arthur L. Smith |
3/4/5
Director
|
0.27%
|
$326,385
130,034 shares
|
— | 22 May 2025 |
| WEXFORD CAPITAL LP |
13F
Company
|
46%
|
$50,599,990
22,096,068 shares
|
— | 30 Sep 2025 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. |
13F
Company
|
9.5%
|
$10,476,750
4,575,000 shares
|
— | 30 Sep 2025 |
| BlackRock, Inc. |
13F
Company
|
3%
|
$3,326,140
1,452,463 shares
|
— | 30 Sep 2025 |
| VANGUARD GROUP INC |
13F
Company
|
2%
|
$2,165,492
945,630 shares
|
— | 30 Sep 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q4 2025
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
71
Shares
34,368,035
Rows available
71
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q4 2025 vs Q3 2025 Across Filers
Q3 2025 holders
76
Q4 2025 holders
71
Holder diff
-5
| Investor | Q3 2025 Shares | Q4 2025 Shares | Share Diff | Share Chg % | Q3 2025 value | Q4 2025 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend