# MAMMOTH ENERGY SVCS INC COM

MAMMOTH ENERGY SVCS INC COM is a security (CUSIP 56155L108) tracked across SEC portfolio filings. 89 institutional managers reported $86.7M on Form 13F as of 2026-06-30; 7 registered fund positions totaling $1.4M via N-PORT as of 2026-05-31.

## Summary

- Issuer: MAMMOTH ENERGY SVCS INC
- Class: COM
- CUSIP: 56155L108
- Asset category: EC
- 13F holders: 89
- 13F value: $86.7M
- 13F period: 2026-06-30
- N-PORT fund positions: 7
- N-PORT value: $1.4M
- N-PORT report: 2026-05-31

## Top institutional holders (Form 13F)

_Showing 15 of 89 managers by value._

| Manager | Location | Value | Shares |
| --- | --- | --- | --- |
| [WEXFORD CAPITAL LP](https://search.stillhousedata.com/firm/108726) | GREENWICH, CT | $54.1M | 22,068,212 |
| [ADAGE CAPITAL PARTNERS GP, L.L.C.](https://search.stillhousedata.com/firm/160679) | Boston, MA | $11.2M | 4,575,000 |
| BlackRock, Inc. | New York, NY | $3.6M | 1,454,839 |
| [Peapod Lane Capital LLC](https://search.stillhousedata.com/firm/159963) | Bedford Hills, NY | $2.6M | 807,804 |
| [VANGUARD GROUP INC](https://search.stillhousedata.com/firm/105958) | Valley Forge, PA | $1.9M | 1,022,411 |
| DIMENSIONAL FUND ADVISORS LP | AUSTIN, TX | $1.7M | 686,199 |
| [GEODE CAPITAL MANAGEMENT, LLC](https://search.stillhousedata.com/firm/115504) | BOSTON, MA | $1.5M | 610,926 |
| STATE STREET CORP | BOSTON, MA | $1.0M | 421,922 |
| Russell Investments Group, Ltd. | Seattle, WA | $1.0M | 317,369 |
| [CITADEL ADVISORS LLC](https://search.stillhousedata.com/firm/148826) | MIAMI, FL | $838K | 331,367 |
| [BRIDGEWAY CAPITAL MANAGEMENT, LLC](https://search.stillhousedata.com/firm/111441) | HOUSTON, TX | $814K | 332,313 |
| Empowered Funds, LLC | HAVERTOWN, PA | $591K | 241,313 |
| [RENAISSANCE TECHNOLOGIES LLC](https://search.stillhousedata.com/firm/106661) | NEW YORK, NY | $568K | 231,972 |
| GOLDMAN SACHS GROUP INC | NEW YORK, NY | $548K | 223,489 |
| NORTHERN TRUST CORP | CHICAGO, IL | $458K | 187,128 |

## Top fund holders (N-PORT)

| Fund | Registrant | Value | % of fund |
| --- | --- | --- | --- |
| [VANGUARD EXTENDED MARKET INDEX FUND](https://search.stillhousedata.com/fund/S000002841) | VANGUARD INDEX FUNDS | $666K | 0.08% |
| [VANGUARD RUSSELL 2000 INDEX FUND](https://search.stillhousedata.com/fund/S000030003) | VANGUARD SCOTTSDALE FUNDS | $414K | 0.24% |
| [U.S. MICRO CAP PORTFOLIO](https://search.stillhousedata.com/fund/S000000948) | DFA INVESTMENT DIMENSIONS GROUP INC | $206K | 0.28% |
| [Master Small Cap Index Series](https://search.stillhousedata.com/fund/S000002716) | Quantitative Master Series LLC | $111K | 0.23% |
| [VANGUARD BALANCED INDEX FUND](https://search.stillhousedata.com/fund/S000002560) | VANGUARD VALLEY FORGE FUNDS | $33K | 0.01% |
| [DWS Small Cap Index VIP](https://search.stillhousedata.com/fund/S000006223) | DEUTSCHE DWS INVESTMENTS VIT FUNDS | $9K | 0.22% |
| [Vericimetry U.S. Small Cap Value Fund](https://search.stillhousedata.com/fund/S000033942) | VERICIMETRY FUNDS | $3K | 0.20% |

## More

- [This page as markdown (for LLM agents)](https://search.stillhousedata.com/security/56155L108.md)
- [Search all SEC filings, advisers and people on Adviser Search](https://search.stillhousedata.com/)

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Source: public SEC filing data via Adviser Search (https://search.stillhousedata.com).
Agents: this data is also queryable via MCP tools and read-only SQL — see https://search.stillhousedata.com/llms.txt.