Markwayne Mullin is an American businessman, former mixed martial arts fighter, and politician who has an estimated net worth of $60 million. His wealth places him among the wealthiest members of the United States Senate.
Mullin has served as a U.S. senator from Oklahoma since 2023 and is a member of the Republican Party. Before joining the Senate, he represented Oklahoma’s 2nd congressional district in the United States House of Representatives from 2013 to 2023.
Known for his outspoken political style and strong support for Donald Trump, Mullin became one of the more recognizable conservative figures in Congress during the late 2010s and early 2020s.
In March 2026, Trump announced that Mullin would be nominated to serve as Secretary of Homeland Security, replacing Kristi Noem. If confirmed, he would lead the United States Department of Homeland Security, one of the largest federal agencies responsible for border security, immigration enforcement, disaster response, and counterterrorism.
| Markwayne Mullin Net Worth | $60 Million |
| Date of Birth | July 26, 1977 |
| Place of Birth | Tulsa, Oklahoma |
Wealth and Business Investments
Unlike many wealthy politicians whose fortunes come from a single large company or business sale, Markwayne Mullin’s wealth has grown through a broad mix of businesses, investments, and real estate holdings.
According to his 2024 financial disclosure, the combined estimated value of his assets ranges from about $24.4 million to $83.5 million before liabilities, reflecting the way congressional disclosures list wealth in value bands rather than exact figures.
A large portion of Mullin’s wealth is tied to Mullin Plumbing, a home-services business he and his wife own. According to his Senate biography, the company is one of the largest home-services providers in the region, offering plumbing, heating, air conditioning, and electrical services across eastern Oklahoma.
Other major assets listed in his financial disclosures include investments valued between $1 million and $5 million, such as:
- Mullin Ranch LLC, a 1,600-acre cattle ranch and event venue in Oklahoma
- Commercial real estate properties including N Shields and S Elm Pl
- An investment property in Washington, D.C.
- The Growth Fund of America (AGTHX)
- iShares Core MSCI EAFE ETF (IEFA)
- iShares Core MSCI Emerging Markets ETF (IEMG)
- Vanguard Mid-Cap ETF (VO)
- T. Rowe Price Blue Chip Growth Fund (TRBCX)
- Goldman Sachs International Small Cap Insights Fund (GICIX)
Mullin also has significant life-insurance-related assets, including policies with Northwestern Mutual and holdings tied to a family insurance trust.
Early Life
Markwayne Mullin was born on July 26, 1977, in Tulsa, Oklahoma, and raised in the small eastern Oklahoma town of Westville.
Westville lies within the territory of the Cherokee Nation, and Mullin is a citizen of the Cherokee Nation, making him one of the relatively few Native Americans to serve in the U.S. Senate.
His distinctive first name, Markwayne, was created by his father by combining two family names.
Mullin grew up working in his family’s plumbing business. He attended Oklahoma State University and later Rogers State University, but he did not complete a college degree. Instead, he returned home to help run the family company after his father became ill.
Business Career
Before entering politics, Mullin established himself as a successful entrepreneur.
After taking over Mullin Plumbing, he expanded the business beyond plumbing services into:
- Heating and air-conditioning installation
- Electrical services
- General home-service operations
Under his leadership, the company grew into one of the largest service providers in eastern Oklahoma, employing dozens of workers and serving a wide regional customer base.
Mullin often highlighted his experience as a small-business owner during his political campaigns, presenting himself as someone who understands the challenges facing entrepreneurs and working families.
In addition to business, he briefly competed as a professional mixed martial arts fighter in the early 2000s.
Career in the U.S. House of Representatives
Mullin entered national politics in 2012, running for Congress in Oklahoma’s 2nd congressional district after Democratic Representative Dan Boren decided not to seek reelection.
Running as a conservative Republican, Mullin won the race and was sworn into the United States House of Representatives in January 2013.
During his decade in the House, Mullin built a reputation as a strong supporter of:
- Limited government
- Lower taxes
- Stricter immigration policies
He was reelected five times, serving from 2013 to 2023. Throughout that period, he became known for his outspoken and combative political style, frequently appearing on television and social media to defend Republican positions.
Election to the U.S. Senate
In 2022, Mullin ran for the Senate seat previously held by longtime Oklahoma Republican Jim Inhofe, who retired.
Mullin won the Republican primary and later defeated Democratic candidate Kendra Horn in the general election.
He officially took office in January 2023 as Oklahoma’s junior senator.
In the Senate, Mullin has continued to align closely with Donald Trump and the broader conservative wing of the Republican Party. He has also drawn national attention for several heated exchanges with political opponents and labor leaders, including a widely publicized confrontation during a Senate hearing in 2023.
Nomination for Secretary of Homeland Security
In March 2026, Donald Trump announced that he would nominate Markwayne Mullin to serve as Secretary of Homeland Security after removing Kristi Noem from the position.
Trump described Mullin as “highly respected” and praised his loyalty and alignment with the administration’s national security and immigration agenda.
If confirmed, Mullin would lead the United States Department of Homeland Security, the agency established after the September 11 attacks. The department oversees major agencies including:
- Federal Emergency Management Agency (FEMA)
- United States Secret Service
- U.S. border and immigration enforcement operations
Because Mullin’s Senate term is scheduled to expire in 2026, Oklahoma law would allow the state’s governor to appoint a temporary replacement if he leaves the Senate before the end of his term.
Personal Life
Markwayne Mullin is married to Christie Mullin, and the couple has six children.
The family lives in Oklahoma and remains closely connected to the plumbing business that helped build Mullin’s wealth.
Outside politics, Mullin maintains a strong interest in athletics and fitness, reflecting his earlier experience competing in mixed martial arts. His background as a business owner, Native American tribal citizen, and former athlete has helped shape a public image that combines entrepreneurship with populist political messaging.
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