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1 insider bought €13k of shares over the last 90 days, the latest by Plaumann Mark Lawrence, filed 17 Sept 2026.
Mammoth Energy Services, Inc.: what insiders have been doing
Mammoth Energy Services, Inc. belongs to the Energy sector. Filings by its managers are published through SEC (Form 4). In the past year (22 October 2025 to 22 October 2026), 13 filings came from 4 insiders.
Every open-market trade in the period is a purchase: 7 purchases worth €9.2M, from 3 insiders, and not a single sale. A purchase on the market is a deliberate choice to commit personal money, which is why it draws more attention than a grant. At €9.1M, the purchase published on 22 June 2026 by Wexford Capital LP is the largest of the period. Those buying include 3 senior executives.
In all, 1 purchase was made within 30 days of a purchase by another insider of the company. A cluster is several different insiders buying the same stock within a short window, a pattern studied more closely than a single purchase. The last purchase on record was published on 17 September 2026, which is 36 days ago. The median gap between a trade and its publication by SEC (Form 4) is 5 days. US insiders must file a Form 4 within two business days of a trade.
With 13 filings in twelve months, the company is quieter than the median of 24 filings across the 3,171 companies we follow on the same exchange. Looking back to 2016, when coverage begins, insiders filed 29 purchases and 40 sales. For the fiscal year to 31 December 2025, the annual 10-K puts revenue at 44.3 m USD and net income at 4.6 m USD.
These figures are compiled from regulatory filings published by SEC (Form 4). They describe what insiders did and are not a recommendation.
Insider Decl.
133
Thresholds
n/a
Buy Volume
€10M
29 ops. · all time
Sell Volume
€151M
40 ops. · all time
Who traded when
BuySaleCorey J. Booker9 sales
Arthur H. Amron6 buys
Arthur L. Smith3 sales
Mark Lawrence Plaumann1 buy
Wexford Capital LP1 buy
Since the insiders bought
- -15.4%Entry US$3.18 · Close 20 Oct 2026 US$2.69
- -12.1%Entry US$3.06 · Close 20 Oct 2026 US$2.69
- -13.2%Entry US$3.10 · Close 20 Oct 2026 US$2.69
Entry is the close on the day after publication, the first price a reader could act on. Prices in the listing currency. Past moves are not a forecast.
This score ranks the purchase within its own market. A position size is suggested only on the venues of the backtested strategy universe; elsewhere, signals stay on watch. Not investment advice.
Fundamental score
Ranked 21,256 of 26,248 companies
29.9
score / 100
Value28
Quality32
FCF yld-68%
Earn yld3.5%
EV/EBITDA·
ROE-8.2%
Gross mgn3.9%
Net mgn10%
Debt/EBITDA·
Pillars2/3
Transparent value + quality ranking, distinct from the insider signal.
Financial data
as of FY 2025FY ended December 2025 · cache
US$2.70
Analyst consensus
Income statement
RevenueUS$44.3M
Gross profitUS$1.7M4% margin
EBITDA-US$17.8M-40% margin
Net incomeUS$4.6M1.0% margin
Valuation
P/Book0.5x
Beta1.14
Balance sheet & cash
Market capUS$129.9M
Total debtUS$3.4M
Free Cash Flow-US$89.1M
Debt / Equity2%
Profitability & ownership
ROE-8.2%
ROA-3.6%
% insiders15.8%
% institutions54.0%
Last declaration on 17 September 2026
Declarations133 total
5,000 shares@ US$3.000.011% mcap100.0% of flowCommon StockSEC:0001628280-26-062552:0
Canonical exit: 15 Dec 2026 (T+90)
19,121 sharesCommon StockSEC:0001398344-26-011116:0
10,329 sharesCommon StockSEC:0001398344-26-011116:1
2,403,831 sharesCommon StockSEC:0001398344-26-011108:0
4,066,610 sharesCommon StockSEC:0001398344-26-011108:1
1,072,896 sharesCommon StockSEC:0001398344-26-011113:0
6,354,667 sharesCommon StockSEC:0001398344-26-011113:1
4,019,574 shares@ US$2.604398.2% of flowCommon StockSEC:0001398344-26-011113:2
Canonical exit: 15 Sept 2026 (T+90)
2,000 shares@ US$3.288.9% of flowCommon StockSEC:0001628280-26-043211:1
Canonical exit: 10 Sept 2026 (T+90)
2,500 shares@ US$3.219910.9% of flowCommon StockSEC:0001628280-26-043211:0
Canonical exit: 9 Sept 2026 (T+90)
3,000 shares@ US$3.250.0054% mcap16.4% of flowCommon StockSEC:0001628280-26-038861:1
Canonical exit: 26 Aug 2026 (T+90)
2,500 shares@ US$3.23990.0045% mcap13.6% of flowCommon StockSEC:0001628280-26-038861:0
Canonical exit: 24 Aug 2026 (T+90)
10,000 shares@ US$1.8931.6% of flowCommon StockSEC:0001628280-25-057101:0
Canonical exit: 11 Mar 2026 (T+90)
20,000 shares@ US$2.5117.1% of flowCommon StockSEC:0001628280-25-027998:0
50,000 shares@ US$2.5118.1% of flowCommon StockSEC:0001628280-25-027125:1
15,000 shares@ US$2.4912.8% of flowCommon StockSEC:0001628280-25-027125:0
1,000 shares@ US$2.97135.5% of flowCommon StockSEC:0001679268-24-000092:0
Canonical exit: 12 Mar 2025 (T+90)
15,000 shares@ US$3.4729.7% of flowCommon StockSEC:0001679268-24-000090:1
10,000 shares@ US$3.4344.8% of flowCommon StockSEC:0001679268-24-000090:0
6,709 shares@ US$3.2512.4% of flowCommon StockSEC:0001679268-24-000088:1
5,000 shares@ US$3.2120.7% of flowCommon StockSEC:0001679268-24-000088:0
3,607 shares@ US$3.5012.3% of flowCommon StockSEC:0001679268-24-000086:1
7,100 shares@ US$3.67633.6% of flowCommon StockSEC:0001679268-24-000086:0
24 shares@ US$3.760.0% of flowCommon StockSEC:0001679268-24-000084:1
3,494 shares@ US$3.617.0% of flowCommon StockSEC:0001679268-24-000084:2
25 of 133 declarations
About Mammoth Energy Services, Inc.
Mammoth Energy Services, Inc. is a U.S.-based energy services company listed on the NASDAQ under the ticker TUSK in the United States. The company has historically positioned itself as an integrated provider to the power grid and to parts of the oilfield services value chain. Its headquarters are in Oklahoma City, Oklahoma, which fits its operational footprint in energy infrastructure and field services.
From a business perspective, Mammoth has operated across several complementary lines: electric transmission and distribution infrastructure services, equipment rentals, sand services, remote accommodations, and, historically, drilling and completion-related services. Recent disclosures show a meaningful portfolio reshaping. In 2025, the company completed the sale of its infrastructure services subsidiaries involved in transmission and distribution work and also sold its hydraulic fracturing equipment and related assets. Those divestitures materially reduced exposure to more capital-intensive and cyclical businesses and reflect a broader strategic reset. More recently, management has emphasized capital allocation and has highlighted investments in aviation as a growth-oriented platform.
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Competitively, Mammoth is best viewed as a niche small-cap services provider rather than a large-scale industry leader. It does not have the breadth or scale of major global oilfield service groups, but it can compete where specialized equipment, flexibility, and project execution matter. The company’s more streamlined balance sheet is also an important part of the investment case. In its first-quarter 2026 update released on May 11, 2026, Mammoth said it ended the quarter debt-free with approximately $125 million of cash, cash equivalents, and marketable securities, which gives it financial flexibility to invest in the business or return capital to shareholders.
Geographically, Mammoth’s business is primarily U.S.-focused, serving utilities and energy customers across domestic markets. Its remote accommodation activities also suggest exposure to industrial and energy regions where workforce housing and logistical support are needed.
Recent highlights include the 2025 asset sales, the company’s continued portfolio rationalization, and its May 2026 earnings release. For French-speaking investors, Mammoth is therefore a U.S. NASDAQ-listed restructuring story: a smaller, specialized energy services company trying to redeploy capital after shrinking its legacy service base. The key questions now are execution, cash deployment, and whether new investments can create durable shareholder value.
