All trades / TUSK

TUSK

MAMMOTH ENERGY SERVICES, INC.

70Open-market trades
+32.1%Avg 90d after buys
+6.22%Avg 90d after sales
+74.4%Avg 180d after buys

Price and insider prints

TUSK adjusted close▲ buy▼ sale
1.732.523.314.094.882026-09-16 buy Plaumann Mark Lawrence2026-06-17 buy DAVIDSON CHARLES E · JACOBS JOSEPH · WEXFORD CAPITAL LP · Wexford GP LLC2026-06-12 buy Amron Arthur H2026-06-11 buy Amron Arthur H2026-05-28 buy Amron Arthur H2026-05-26 buy Amron Arthur H2025-12-11 buy Amron Arthur H2025-05-22 sell SMITH ARTHUR L2025-05-20 sell SMITH ARTHUR L2025-05-19 sell SMITH ARTHUR L2024-12-12 buy Amron Arthur H2024-11-25 sell Booker Corey J.2024-11-22 sell Booker Corey J.2024-11-21 sell Booker Corey J.2024-11-20 sell Booker Corey J.2024-11-14 sell Booker Corey J.2024-11-13 sell Booker Corey J.2024-11-11 sell Booker Corey J.2024-11-08 sell Booker Corey J.2024-11-07 sell Booker Corey J.2024-05-30 buy Amron Arthur H2024-05-28 buy Amron Arthur H2024-03-12 buy Amron Arthur H2023-12-19 sell Straehla Arty2023-12-18 sell Straehla Arty2023-12-15 sell Straehla Arty2023-12-14 sell Straehla Arty2023-12-13 sell Straehla Arty2023-09-202026-09-18

Trades

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DateForm 4TickerInsiderTitleSideSharesValue90d180d
9/16/2026Form 4TUSKPlaumann Mark LawrenceMark Plaumann, age 70, has served as one of our directors since June 2025. Mr. Plaumann is currently a Managing Member of Greyhawke Capital Advisors LLC, or Greyhawke, which he co-founded in 1998. Prior to founding Greyhawke, Mr. Plaumann was a Senior Vice President of Wexford Capital LP. Mr. Plaumann was formerly a Managing Director of Alvarez & Marsal, Inc. and the President of American Healthcare Management, Inc. He also was Senior Manager at Ernst & Young LLP. Mr. Plaumann served as a director and audit committee chairman for ICx Technologies, Inc. from 2006 until 2010, served as a director and a member of the audit and compensation committees of Republic Airways Holdings, Inc. from 2002 until 2017 and…DirectorBUY5,000$15.0K+3.66%hist+7.30%hist
6/17/2026Form 4TUSKDAVIDSON CHARLES E · JACOBS JOSEPH · WEXFORD CAPITAL LP · Wexford GP LLCChief Business OfficerBUY4,019,574$10.45M0.00%+4.01%hist
6/12/2026Form 4TUSKAmron Arthur HMr. Amron has served on the board of directors of Nephros, Inc., a public commercial stage medical device company, since September 2007. From 1991 to 1994, Mr. Amron was an Associate at Schulte Roth & Zabel LLP, specializing in corporate and bankruptcy law and, from 1984 to 1991, Mr. Amron was an Associate at Debevoise & Plimpton LLP specializing in corporate litigation and bankruptcy law. Mr. Amron holds a J.D. from Harvard University and a B.A. in Political Theory from Colgate University and is an inactive member of the New York Bar. We believe Mr. Amron’s legal training and extensive transactional experience, including in mergers and acquisitions, private equity investments and financing transactions, as…DirectorBUY2,000$6.6K−5.47%−0.89%hist
6/11/2026Form 4TUSKAmron Arthur HMr. Amron has served on the board of directors of Nephros, Inc., a public commercial stage medical device company, since September 2007. From 1991 to 1994, Mr. Amron was an Associate at Schulte Roth & Zabel LLP, specializing in corporate and bankruptcy law and, from 1984 to 1991, Mr. Amron was an Associate at Debevoise & Plimpton LLP specializing in corporate litigation and bankruptcy law. Mr. Amron holds a J.D. from Harvard University and a B.A. in Political Theory from Colgate University and is an inactive member of the New York Bar. We believe Mr. Amron’s legal training and extensive transactional experience, including in mergers and acquisitions, private equity investments and financing transactions, as…DirectorBUY2,500$8.1K−0.63%−0.89%hist
5/28/2026Form 4TUSKAmron Arthur HMr. Amron has served on the board of directors of Nephros, Inc., a public commercial stage medical device company, since September 2007. From 1991 to 1994, Mr. Amron was an Associate at Schulte Roth & Zabel LLP, specializing in corporate and bankruptcy law and, from 1984 to 1991, Mr. Amron was an Associate at Debevoise & Plimpton LLP specializing in corporate litigation and bankruptcy law. Mr. Amron holds a J.D. from Harvard University and a B.A. in Political Theory from Colgate University and is an inactive member of the New York Bar. We believe Mr. Amron’s legal training and extensive transactional experience, including in mergers and acquisitions, private equity investments and financing transactions, as…DirectorBUY3,000$9.8K−2.18%−0.89%hist
5/26/2026Form 4TUSKAmron Arthur HMr. Amron has served on the board of directors of Nephros, Inc., a public commercial stage medical device company, since September 2007. From 1991 to 1994, Mr. Amron was an Associate at Schulte Roth & Zabel LLP, specializing in corporate and bankruptcy law and, from 1984 to 1991, Mr. Amron was an Associate at Debevoise & Plimpton LLP specializing in corporate litigation and bankruptcy law. Mr. Amron holds a J.D. from Harvard University and a B.A. in Political Theory from Colgate University and is an inactive member of the New York Bar. We believe Mr. Amron’s legal training and extensive transactional experience, including in mergers and acquisitions, private equity investments and financing transactions, as…DirectorBUY2,500$8.1K−3.72%−0.89%hist
12/11/2025Form 4TUSKAmron Arthur HMr. Amron has served on the board of directors of Nephros, Inc., a public commercial stage medical device company, since September 2007. From 1991 to 1994, Mr. Amron was an Associate at Schulte Roth & Zabel LLP, specializing in corporate and bankruptcy law and, from 1984 to 1991, Mr. Amron was an Associate at Debevoise & Plimpton LLP specializing in corporate litigation and bankruptcy law. Mr. Amron holds a J.D. from Harvard University and a B.A. in Political Theory from Colgate University and is an inactive member of the New York Bar. We believe Mr. Amron’s legal training and extensive transactional experience, including in mergers and acquisitions, private equity investments and financing transactions, as…DirectorBUY10,000$18.9K+18.3%+79.6%
5/22/2025Form 4TUSKSMITH ARTHUR LDirectorSELL20,000$50.2K+10.7%+27.5%
5/20/2025Form 4TUSKSMITH ARTHUR LDirectorSELL50,000$125.5K+4.90%+24.5%
5/19/2025Form 4TUSKSMITH ARTHUR LDirectorSELL15,000$37.4K+6.80%+26.0%
12/12/2024Form 4TUSKAmron Arthur HMr. Amron has served on the board of directors of Nephros, Inc., a public commercial stage medical device company, since September 2007. From 1991 to 1994, Mr. Amron was an Associate at Schulte Roth & Zabel LLP, specializing in corporate and bankruptcy law and, from 1984 to 1991, Mr. Amron was an Associate at Debevoise & Plimpton LLP specializing in corporate litigation and bankruptcy law. Mr. Amron holds a J.D. from Harvard University and a B.A. in Political Theory from Colgate University and is an inactive member of the New York Bar. We believe Mr. Amron’s legal training and extensive transactional experience, including in mergers and acquisitions, private equity investments and financing transactions, as…DirectorBUY1,000$3.0K−28.3%0.00%
11/25/2024Form 4TUSKBooker Corey J.Corey Booker, age 50, has served as a director of the Company since August 2020. Dr. Booker is the founder, and since November 2012 has served as the Chief Executive Officer, of Bedside LLC (formerly OnPulse, LLC), a healthcare management services company designed to improve patient health through advocacy, care coordination, communication and increased patient health literacy. In addition to his career at Bedside LLC, Dr. Booker practiced medicine as a maternal fetal specialist at Duke University Hospital from October 2012 to June 2017. Dr. Booker has served on the board of directors of HarborPath Inc., or HarborPath, a non-profit patient assistance program providing specialty pharmacy gap coverage to…DirectorSELL15,000$52.0K+27.5%+26.6%
11/22/2024Form 4TUSKBooker Corey J.Corey Booker, age 50, has served as a director of the Company since August 2020. Dr. Booker is the founder, and since November 2012 has served as the Chief Executive Officer, of Bedside LLC (formerly OnPulse, LLC), a healthcare management services company designed to improve patient health through advocacy, care coordination, communication and increased patient health literacy. In addition to his career at Bedside LLC, Dr. Booker practiced medicine as a maternal fetal specialist at Duke University Hospital from October 2012 to June 2017. Dr. Booker has served on the board of directors of HarborPath Inc., or HarborPath, a non-profit patient assistance program providing specialty pharmacy gap coverage to…DirectorSELL10,000$34.3K+19.2%+30.1%
11/21/2024Form 4TUSKBooker Corey J.Corey Booker, age 50, has served as a director of the Company since August 2020. Dr. Booker is the founder, and since November 2012 has served as the Chief Executive Officer, of Bedside LLC (formerly OnPulse, LLC), a healthcare management services company designed to improve patient health through advocacy, care coordination, communication and increased patient health literacy. In addition to his career at Bedside LLC, Dr. Booker practiced medicine as a maternal fetal specialist at Duke University Hospital from October 2012 to June 2017. Dr. Booker has served on the board of directors of HarborPath Inc., or HarborPath, a non-profit patient assistance program providing specialty pharmacy gap coverage to…DirectorSELL6,709$21.8K+14.6%+24.1%
11/20/2024Form 4TUSKBooker Corey J.Corey Booker, age 50, has served as a director of the Company since August 2020. Dr. Booker is the founder, and since November 2012 has served as the Chief Executive Officer, of Bedside LLC (formerly OnPulse, LLC), a healthcare management services company designed to improve patient health through advocacy, care coordination, communication and increased patient health literacy. In addition to his career at Bedside LLC, Dr. Booker practiced medicine as a maternal fetal specialist at Duke University Hospital from October 2012 to June 2017. Dr. Booker has served on the board of directors of HarborPath Inc., or HarborPath, a non-profit patient assistance program providing specialty pharmacy gap coverage to…DirectorSELL5,000$16.1K+11.5%+22.6%
11/14/2024Form 4TUSKBooker Corey J.Corey Booker, age 50, has served as a director of the Company since August 2020. Dr. Booker is the founder, and since November 2012 has served as the Chief Executive Officer, of Bedside LLC (formerly OnPulse, LLC), a healthcare management services company designed to improve patient health through advocacy, care coordination, communication and increased patient health literacy. In addition to his career at Bedside LLC, Dr. Booker practiced medicine as a maternal fetal specialist at Duke University Hospital from October 2012 to June 2017. Dr. Booker has served on the board of directors of HarborPath Inc., or HarborPath, a non-profit patient assistance program providing specialty pharmacy gap coverage to…DirectorSELL3,607$12.6K+18.0%+25.5%
11/13/2024Form 4TUSKBooker Corey J.Corey Booker, age 50, has served as a director of the Company since August 2020. Dr. Booker is the founder, and since November 2012 has served as the Chief Executive Officer, of Bedside LLC (formerly OnPulse, LLC), a healthcare management services company designed to improve patient health through advocacy, care coordination, communication and increased patient health literacy. In addition to his career at Bedside LLC, Dr. Booker practiced medicine as a maternal fetal specialist at Duke University Hospital from October 2012 to June 2017. Dr. Booker has served on the board of directors of HarborPath Inc., or HarborPath, a non-profit patient assistance program providing specialty pharmacy gap coverage to…DirectorSELL7,100$26.1K+15.7%+27.9%
11/11/2024Form 4TUSKBooker Corey J.Corey Booker, age 50, has served as a director of the Company since August 2020. Dr. Booker is the founder, and since November 2012 has served as the Chief Executive Officer, of Bedside LLC (formerly OnPulse, LLC), a healthcare management services company designed to improve patient health through advocacy, care coordination, communication and increased patient health literacy. In addition to his career at Bedside LLC, Dr. Booker practiced medicine as a maternal fetal specialist at Duke University Hospital from October 2012 to June 2017. Dr. Booker has served on the board of directors of HarborPath Inc., or HarborPath, a non-profit patient assistance program providing specialty pharmacy gap coverage to…DirectorSELL3,494$12.6K+16.8%+29.1%
11/8/2024Form 4TUSKBooker Corey J.Corey Booker, age 50, has served as a director of the Company since August 2020. Dr. Booker is the founder, and since November 2012 has served as the Chief Executive Officer, of Bedside LLC (formerly OnPulse, LLC), a healthcare management services company designed to improve patient health through advocacy, care coordination, communication and increased patient health literacy. In addition to his career at Bedside LLC, Dr. Booker practiced medicine as a maternal fetal specialist at Duke University Hospital from October 2012 to June 2017. Dr. Booker has served on the board of directors of HarborPath Inc., or HarborPath, a non-profit patient assistance program providing specialty pharmacy gap coverage to…DirectorSELL24$90.24+14.9%+30.7%
11/7/2024Form 4TUSKBooker Corey J.Corey Booker, age 50, has served as a director of the Company since August 2020. Dr. Booker is the founder, and since November 2012 has served as the Chief Executive Officer, of Bedside LLC (formerly OnPulse, LLC), a healthcare management services company designed to improve patient health through advocacy, care coordination, communication and increased patient health literacy. In addition to his career at Bedside LLC, Dr. Booker practiced medicine as a maternal fetal specialist at Duke University Hospital from October 2012 to June 2017. Dr. Booker has served on the board of directors of HarborPath Inc., or HarborPath, a non-profit patient assistance program providing specialty pharmacy gap coverage to…DirectorSELL165$643.50+17.4%+29.8%
5/30/2024Form 4TUSKAmron Arthur HMr. Amron has served on the board of directors of Nephros, Inc., a public commercial stage medical device company, since September 2007. From 1991 to 1994, Mr. Amron was an Associate at Schulte Roth & Zabel LLP, specializing in corporate and bankruptcy law and, from 1984 to 1991, Mr. Amron was an Associate at Debevoise & Plimpton LLP specializing in corporate litigation and bankruptcy law. Mr. Amron holds a J.D. from Harvard University and a B.A. in Political Theory from Colgate University and is an inactive member of the New York Bar. We believe Mr. Amron’s legal training and extensive transactional experience, including in mergers and acquisitions, private equity investments and financing transactions, as…DirectorBUY3,000$10.9K+2.16%−1.08%
5/28/2024Form 4TUSKAmron Arthur HMr. Amron has served on the board of directors of Nephros, Inc., a public commercial stage medical device company, since September 2007. From 1991 to 1994, Mr. Amron was an Associate at Schulte Roth & Zabel LLP, specializing in corporate and bankruptcy law and, from 1984 to 1991, Mr. Amron was an Associate at Debevoise & Plimpton LLP specializing in corporate litigation and bankruptcy law. Mr. Amron holds a J.D. from Harvard University and a B.A. in Political Theory from Colgate University and is an inactive member of the New York Bar. We believe Mr. Amron’s legal training and extensive transactional experience, including in mergers and acquisitions, private equity investments and financing transactions, as…DirectorBUY2,000$7.1K+3.00%−6.81%
3/12/2024Form 4TUSKAmron Arthur HMr. Amron has served on the board of directors of Nephros, Inc., a public commercial stage medical device company, since September 2007. From 1991 to 1994, Mr. Amron was an Associate at Schulte Roth & Zabel LLP, specializing in corporate and bankruptcy law and, from 1984 to 1991, Mr. Amron was an Associate at Debevoise & Plimpton LLP specializing in corporate litigation and bankruptcy law. Mr. Amron holds a J.D. from Harvard University and a B.A. in Political Theory from Colgate University and is an inactive member of the New York Bar. We believe Mr. Amron’s legal training and extensive transactional experience, including in mergers and acquisitions, private equity investments and financing transactions, as…DirectorBUY3,000$11.2K−1.64%−1.10%
12/19/2023Form 4TUSKStraehla ArtyChief Executive OfficerSELL40,000$174.0K+19.2%+26.7%
12/18/2023Form 4TUSKStraehla ArtyChief Executive OfficerSELL30,000$131.4K+17.5%+25.2%
12/15/2023Form 4TUSKStraehla ArtyChief Executive OfficerSELL40,000$174.4K+17.8%+16.9%
12/14/2023Form 4TUSKStraehla ArtyChief Executive OfficerSELL55,000$244.2K+18.9%+19.2%
12/13/2023Form 4TUSKStraehla ArtyChief Executive OfficerSELL25,000$109.7K+20.7%+22.0%
11/11/2022Form 4TUSKSMITH ARTHUR LDirectorSELL20,000$141.4K+14.4%+49.4%
6/17/2022Form 4TUSKDAVIDSON CHARLES E · JACOBS JOSEPH · WEXFORD CAPITAL LP · Wexford GP LLC10% owner and DirectorBUY10,382$22.5K+99.5%+190.4%
6/16/2022Form 4TUSKDAVIDSON CHARLES E · JACOBS JOSEPH · WEXFORD CAPITAL LP · Wexford GP LLC10% owner and DirectorBUY35,000$74.5K+110.9%+178.7%
6/15/2022Form 4TUSKDAVIDSON CHARLES E · JACOBS JOSEPH · WEXFORD CAPITAL LP · Wexford GP LLC10% owner and DirectorBUY5,100$11.4K+102.7%+158.5%
6/14/2022Form 4TUSKDAVIDSON CHARLES E · JACOBS JOSEPH · WEXFORD CAPITAL LP · Wexford GP LLC10% owner and DirectorBUY20,600$47.0K+105.3%+156.2%
6/13/2022Form 4TUSKDAVIDSON CHARLES E · JACOBS JOSEPH · WEXFORD CAPITAL LP · Wexford GP LLC10% owner and DirectorBUY25,102$59.0K+100.9%+150.6%
6/10/2022Form 4TUSKDAVIDSON CHARLES E · JACOBS JOSEPH · WEXFORD CAPITAL LP · Wexford GP LLC10% owner and DirectorBUY54,779$134.8K+78.0%+126.0%
6/9/2022Form 4TUSKDAVIDSON CHARLES E · JACOBS JOSEPH · WEXFORD CAPITAL LP · Wexford GP LLC10% owner and DirectorBUY27,489$68.2K+85.0%+123.6%
6/8/2022Form 4TUSKDAVIDSON CHARLES E · JACOBS JOSEPH · WEXFORD CAPITAL LP · Wexford GP LLC10% owner and DirectorBUY15,500$38.8K+73.5%+119.1%
3/10/2022Form 4TUSKLayton Mark E.CFO and SecretarySELL40,417$82.5K−27.9%−121.9%
12/13/2021Form 4TUSKSMITH ARTHUR LDirectorBUY25,000$50.0K+8.02%+23.5%
3/11/2021Form 4TUSKLayton Mark E.CFO and SecretarySELL55,789$291.2K+26.5%+30.3%
3/10/2021Form 4TUSKStraehla ArtyChief Executive OfficerSELL102,435$541.9K+30.6%+33.5%
3/9/2021Form 4TUSKStraehla ArtyChief Executive OfficerSELL46,555$254.7K+27.5%+32.7%
11/10/2020Form 4TUSKStraehla ArtyChief Executive OfficerSELL5,000$8.9K−165.0%−102.8%
9/4/2020Form 4TUSKSMITH ARTHUR LDirectorBUY20,000$25.8K+65.9%+337.0%
11/21/2019Form 4TUSKRoss MatthewDirectorSELL2,913$4.2K+0.69%+12.4%
11/20/2019Form 4TUSKDAVIDSON CHARLES E · JACOBS JOSEPH · MEH SUB LLC · WEXFORD CAPITAL LP · Wexford Catalyst Trading LTD · Wexford GP LLC · Wexford Spectrum Trading LTD10% owner and DirectorBUY16,692$22.2K−8.67%−20.0%
11/13/2019Form 4TUSKDAVIDSON CHARLES E · JACOBS JOSEPH · MEH SUB LLC · WEXFORD CAPITAL LP · Wexford Catalyst Trading LTD · Wexford GP LLC · Wexford Spectrum Trading LTD10% owner and DirectorBUY35,904$48.8K−0.72%−6.52%
12/3/2018Form 4TUSKSMITH ARTHUR LDirectorSELL6,000$149.1K+8.77%+57.1%
11/12/2018Form 4TUSKStraehla ArtyChief Executive OfficerSELL2,230$58.4K+15.8%+43.9%
11/9/2018Form 4TUSKLayton Mark E.CFO and SecretarySELL142$3.7K+19.6%+45.1%
11/8/2018Form 4TUSKLayton Mark E.CFO and SecretarySELL994$27.1K+16.5%+45.7%
11/8/2018Form 4TUSKStraehla ArtyChief Executive OfficerSELL11,460$312.7K+16.5%+45.7%
11/8/2018Form 4TUSKStraehla ArtyChief Executive OfficerSELL25,151$665.2K+16.5%+45.7%
7/30/2018Form 4TUSKDAVIDSON CHARLES E · JACOBS JOSEPH · MEH SUB LLC · WEXFORD CAPITAL LP · Wexford GP LLC10% owner and DirectorSELL266,026$10.11M+31.6%+35.7%
7/30/2018Form 4TUSKGULFPORT ENERGY CORP10% owner and DirectorSELL118,974$4.52M+31.6%+35.7%
6/29/2018Form 4TUSKDAVIDSON CHARLES E · JACOBS JOSEPH · MEH SUB LLC · WEXFORD CAPITAL LP · Wexford GP LLC10% owner and DirectorSELL2,764,400$105.07M+15.3%+46.1%
6/29/2018Form 4TUSKGULFPORT ENERGY CORP10% owner and DirectorSELL1,235,600$46.97M+15.3%+46.1%
3/1/2018Form 4TUSKLayton Mark E.CFO and SecretarySELL4,373$114.3K−42.0%−12.6%
11/15/2017Form 4TUSKStraehla ArtyChief Executive OfficerSELL7,553$134.5K−12.6%−90.3%
11/14/2017Form 4TUSKLayton Mark E.CFO and SecretarySELL925$17.6K−8.57%−81.7%
11/14/2017Form 4TUSKStraehla ArtyChief Executive OfficerSELL18,289$342.2K−8.57%−81.7%
8/25/2017Form 4TUSKPalm James DDirectorBUY2,000$25.2K+47.2%+56.4%
8/24/2017Form 4TUSKPalm James DDirectorBUY4,000$51.3K+47.0%+56.7%
6/9/2017Form 4TUSKSMITH ARTHUR LDirectorBUY6,000$101.5K−18.7%+0.41%
2/28/2017Form 4TUSKStraehla ArtyChief Executive OfficerBUY460$10.0K−14.6%−40.5%
10/19/2016Form 4TUSKDAVIDSON CHARLES E · JACOBS JOSEPH · Mammoth Energy Holdings LLC · WEXFORD CAPITAL LP · Wexford GP LLC10% owner and DirectorSELL171,797$2.42M−22.5%−34.6%
10/19/2016Form 4TUSKStraehla ArtyChief Executive OfficerBUY666$10.0K+22.5%+34.6%
10/19/2016Form 4TUSKStraehla ArtyChief Executive OfficerBUY666$10.0K+22.5%+34.6%
10/19/2016Form 4TUSKLayton Mark E.CFO and SecretaryBUY3,000$45.0K+22.5%+34.6%
10/19/2016Form 4TUSKGULFPORT ENERGY CORP10% owner and DirectorSELL76,250$1.07M−22.5%−34.6%

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