Companies / Mammoth Energy Services, Inc.
Mammoth Energy Services, Inc.
Nasdaq: TUSKCIK 1679268OKLAHOMA CITY, OK
Insider flow · last 90 daysNet buys $10.50M
Financials · FY2025
Ownership
48.1M shares outstanding · as of Aug 4, 2026
Ownership
| Insiders | 38.73% | 18,638,849 |
| Institutions | 23.50% | 11,311,148 |
| Public float | 37.77% | 18,177,588 |
% of common shares outstanding (exact, from the latest cover-page filing). Institutions are quarterly 13F snapshots; insiders reflect current officers & directors.
Insiders 7
View all →| Insider | % of shares | Shares |
|---|---|---|
Wexford Capital LPChief Business Officer · Director · 10% owner | 25.08% | 12,071,823 |
Charles E. DavidsonChief Business Officer · Director · 10% owner | 13.44% | 6,470,441 |
Amron Arthur HDirector | 0.20% | 96,585 |
Amron Holdings LLCDirector | — | — |
CD Holding Company, LLC10% owner | — | — |
Jacobs JosephChief Business Officer · Director · 10% owner | — | — |
Wexford GP LLCChief Business Officer · Director · 10% owner | — | — |
Institutional holders 79
View all →| Holder | Value | % of shares |
|---|---|---|
| $54.07M | 45.85% | |
| $11.21M | 9.51% | |
| $1.89M | 2.12% | |
| $1.50M | 1.27% | |
| $1.33M | 0.85% | |
| $1.29M | 1.45% | |
| $814.2K | 0.69% | |
| $568.3K | 0.48% | |
| $541.5K | 0.61% | |
| $457.9K | 0.51% |
Activity
Jun 30, 2026View all →
InsidersInstitutions
Who's accumulating and trimming this stock (13F).| Date | Actor | Action | Security | Value | Shares Δ | Position after | Impact |
|---|---|---|---|---|---|---|---|
| Q2 2026 as of | BlackRock, Inc. 13F manager | Trim | Common stock | $-3.46M | -1.1M -72.30% | 407,976 0.85% of shares | low |
| Q2 2026 as of | State Street Corporation 13F manager | Trim | Common stock | $-996.5K | -307K -75.06% | 101,864 0.21% of shares | low |
| Q1 2026 as of | Los Angeles Capital Management LLC 13F manager | New | Common stock | $400.0K | +163K | 163,259 0.34% of shares | low |
| Q1 2026 as of | Boston Partners 13F manager | New | Common stock | $378.3K | +154K | 154,388 0.32% of shares | low |
| Q1 2026 as of | Bridgeway Capital Management, LLC 13F manager | Trim | Common stock | $-190.3K | -78K -18.95% | 332,313 0.69% of shares | low |
| Q1 2026 as of | AQR Capital Management, LLC 13F manager | Add | Common stock | $135.9K | +55K +492.90% | 66,731 0.14% of shares | low |
| Q4 2023 as of | Barclays PLC 13F manager | Add | Common stock | $127.3K | +29K +97.87% | 57,727 0.12% of shares | low |
| Q1 2026 as of | Renaissance Technologies LLC 13F manager | Add | Common stock | $112.5K | +46K +24.67% | 231,972 0.48% of shares | low |
5%+ ownership events
Schedule 13D / 13G
| Filer | Stance | % of class |
|---|---|---|
| Charles E. Davidson | Passive13G | — |
| Wexford Capital LP | Passive13G/A | — |
Securities
via CUSIP / OpenFIGI
| Symbol | Type | CUSIP |
|---|---|---|
| TUSK | — | 56155L108 |