Security key
56155L108
MAMMOTH ENERGY SERVICES, INC. - Common Stock, $0.01 par value (TUSK)
CUSIP: 56155L108
Q1 2026 13F Holders as of 31 Mar 2026
- Security type / class
- Equity / Common Stock, $0.01 par value
- Total 13F shares
- 35,063,743
- Total 13F value
- $85,955,735
- Share change
- +600,714
- Put/Call ratio
- 89%
- SEC-reported price per share
- $2.45
- Number of holders
- 88
- Value change
- +$1,759,416
- Number of buys
- 51
- Number of sells
- 34
- Shares outstanding
- 48,165,948
Holder snapshot
7 signals
Show 1 more signal
Security identity
1 source field
Report period
Q1 2026
Institutions
88
Top holders
10
TUSK full security history
Ownership snapshot
Full 13F holder table
Previous quarter: Q4 2025
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
31 Dec 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.
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.
3.1%
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 |
3/4/5
13F
Director, 10%+ Owner · Company
|
46%
from 13F
|
$95,922,417
22,030,872 shares
|
— | 12 Mar 2024 |
| ADAGE CAPITAL PARTNERS GP, L.L.C. |
13F
Company
|
9.5%
|
$8,463,750
4,575,000 shares
|
— | 31 Dec 2025 |
| BlackRock, Inc. |
13F
Company
|
3.1%
|
$2,725,131
1,473,044 shares
|
— | 31 Dec 2025 |
| VANGUARD GROUP INC |
13F
Company
|
2.1%
|
$1,891,461
1,022,411 shares
|
— | 31 Dec 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 Q1 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
88
Shares
35,063,743
Rows available
88
| 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 Q1 2026 vs Q4 2025 Across Filers
Q4 2025 holders
71
Q1 2026 holders
88
Holder diff
17
| Investor | Q4 2025 Shares | Q1 2026 Shares | Share Diff | Share Chg % | Q4 2025 value | Q1 2026 value | Value change | Value Chg % |
|---|
Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).
Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend