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William McMullen
Chairman at
MACH NATURAL RESOURCES LP
Net worth: 946 M $ as of 2026-06-29
Profile
William W.
McMullen is the founder of Bayou City Energy Management LLC, serving as Managing Partner since 2015.
Current jobs include Chairman at Mach Natural Resources LP since 2023, Director at Alta Mesa Resources, Inc. since 2018, and Manager at Bayou City Energy Partners LP since 2014.
Former jobs include Director at Alta Mesa Holdings LP, Director at Alta Mesa Holdings GP LLC, Associate at Denham Capital Management LP, Analyst at UBS Investment Bank (US), Board Member at Young Professionals In Energy, and Vice President at White Deer Management LLC.
Education includes an undergraduate degree from Harvard University, conferred in 2008.
Known holdings in public companies
| Company | Date | Number of shares | Valuation | Valuation date |
|---|---|---|---|---|
| 2026-03-22 | 74,859,917 ( 44.51% ) | 946 M $ | 2026-06-29 |
William McMullen active positions
| Companies | Position | Start |
|---|---|---|
| ALTA MESA RESOURCES, INC. | Director/Board Member | 2018-02-08 |
| MACH NATURAL RESOURCES LP | Chairman | 2023-10-26 |
Bayou City Energy Management LLC
 Bayou City Energy Management LLC Investment ManagersFinance Bayou City Energy invests in lower middle-market companies located in the United States. The firm focuses on upstream oil and gas sectors. It provides financing for buyout and growth stage capital requirements. It also makes follow on investments. It also takes controlling and minority interest in companies. | Founder | 2014-12-31 |
Bayou City Energy Partners LP | Corporate Officer/Principal | 2014-03-31 |
Former positions of William McMullen
| Companies | Position | End |
|---|---|---|
Alta Mesa Holdings GP LLC
 Alta Mesa Holdings GP LLC Oil & Gas ProductionEnergy Minerals Engages in the onshore oil and natural gas acquisition, exploitation and exploration services | Director/Board Member | 2018-02-08 |
White Deer Management LLC
 White Deer Management LLC Investment ManagersFinance White Deer Management invests in companies located in the United States. The firm targets companies operating in the fields of energy and industrial service sectors. It provides financing for buyout and growth stage capital requirements and also acquires majority interest. | Corporate Officer/Principal | 2014-12-30 |
Alta Mesa Holdings LP
 Alta Mesa Holdings LP Oil & Gas ProductionEnergy Minerals Engages in the onshore oil and natural gas acquisition, exploitation and exploration services | Director/Board Member | - |
Young Professionals In Energy | Corporate Officer/Principal | - |
UBS Investment Bank (US)
 UBS Investment Bank (US) Investment Banks/BrokersFinance Provides investment banking services | Corporate Officer/Principal | - |
Training of William McMullen
Experiences
Positions held
Active
Inactive
Listed companies
Private companies
Connections
92
1st degree connections
11
1st degree companies
Male
Female
Members of the board
Executives
Linked companies
| Private companies | 11 |
|---|---|
Harvard University
 Harvard University Other Consumer ServicesConsumer Services Functions as a College/University | Consumer Services |
Denham Capital Management LP
 Denham Capital Management LP Investment ManagersFinance Denham Capital invests in companies located across the globe. The firm focuses on a broad range of sectors and industries. It participates in buyout transactions. | Finance |
UBS Investment Bank (US)
UBS Investment Bank (US) Investment Banks/BrokersFinance Provides investment banking services | Finance |
Alta Mesa Holdings LP
Alta Mesa Holdings LP Oil & Gas ProductionEnergy Minerals Engages in the onshore oil and natural gas acquisition, exploitation and exploration services | Energy Minerals |
Young Professionals In Energy | |
White Deer Management LLC
White Deer Management LLC Investment ManagersFinance White Deer Management invests in companies located in the United States. The firm targets companies operating in the fields of energy and industrial service sectors. It provides financing for buyout and growth stage capital requirements and also acquires majority interest. | Finance |
Alta Mesa Holdings GP LLC
Alta Mesa Holdings GP LLC Oil & Gas ProductionEnergy Minerals Engages in the onshore oil and natural gas acquisition, exploitation and exploration services | Energy Minerals |
Bayou City Energy Partners LP | |
Bayou City Energy Management LLC
Bayou City Energy Management LLC Investment ManagersFinance Bayou City Energy invests in lower middle-market companies located in the United States. The firm focuses on upstream oil and gas sectors. It provides financing for buyout and growth stage capital requirements. It also makes follow on investments. It also takes controlling and minority interest in companies. | Finance |
Alta Mesa Resources, Inc.
 Alta Mesa Resources, Inc. Integrated OilEnergy Minerals Explores oil and natural gas | Energy Minerals |
Mach Natural Resources LP
 Mach Natural Resources LP Integrated OilEnergy Minerals Engages in production of oil and natural gas | Energy Minerals |
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