Maryann Mannen: Difference between revisions

The neutral encyclopedia of notable people
Content engine: create biography for Maryann Mannen (1856 words)
 
Content engine: create biography for Maryann Mannen (1898 words) [update]
 
Line 1: Line 1:
{{Infobox person
{{Infobox person
| name = Maryann T. Mannen
| name         = Maryann T. Mannen
| birth_name =
| birth_name   =  
| birth_date =
| nationality = American
| birth_place =
| occupation   = Corporate executive
| nationality = American
| known_for   = CEO and Chairman of [[Marathon Petroleum Corporation]]
| occupation = Corporate executive
| employer     = Marathon Petroleum Corporation
| known_for = CEO and Chairman of [[Marathon Petroleum Corporation]]
| title       = President, CEO, and Chairman of the Board
| employer = Marathon Petroleum Corporation
| awards       =  
| title = President, CEO, and Chairman of the Board
| website     = [https://www.marathonpetroleum.com/ marathonpetroleum.com]
| education =
| awards =
| website = https://www.marathonpetroleum.com/
}}
}}


'''Maryann T. Mannen''' is an American corporate executive who serves as the president, chief executive officer, and chairman of the board of [[Marathon Petroleum Corporation]] (NYSE: MPC), the largest petroleum refining company in the United States. She assumed the role of chairman on January 1, 2026, succeeding Michael J. Hennigan, who retired from the position.<ref name="stocktitan">{{cite web |title=Marathon Petroleum Corp. elects Maryann T. Mannen as Chairman of the Board |url=https://www.stocktitan.net/news/MPC/marathon-petroleum-corp-elects-maryann-t-mannen-as-chairman-of-the-dg132et4gmy3.html |publisher=Stock Titan |date=November 4, 2025 |access-date=2026-02-23}}</ref> Mannen's leadership places her at the helm of a company that, following its acquisition of Andeavor in 2018, operates 13 refineries with a combined capacity exceeding three million barrels per calendar day.<ref name="cnbc">{{cite news |title=Marathon Petroleum-Andeavor merger checks the boxes where it counts |url=https://www.cnbc.com/2018/05/01/marathon-petroleum-andeavor-merger-checks-the-boxes-where-it-counts.html |work=CNBC |date=May 1, 2018 |access-date=2026-02-23}}</ref> In February 2026, she was elected to the board of directors of [[Prudential Financial|Prudential Financial Inc.]] as an independent director, effective May 12, 2026.<ref name="prudential">{{cite news |title=Prudential Financial Elects Maryann Mannen to Board of Directors |url=https://www.businesswire.com/news/home/20260210263152/en/Prudential-Financial-Elects-Maryann-Mannen-to-Board-of-Directors |work=Business Wire |date=February 10, 2026 |access-date=2026-02-23}}</ref> Under Mannen's leadership, Marathon Petroleum continues to rank among the largest corporations in the United States, having appeared at No. 41 on the 2018 [[Fortune 500]] list by total revenue.<ref name="fortune">{{cite web |title=Fortune 500 List |url=http://fortune.com/fortune500/list/ |publisher=Fortune |access-date=2026-02-23}}</ref>
'''Maryann T. Mannen''' is an American corporate executive who serves as president, chief executive officer, and chairman of the board of [[Marathon Petroleum Corporation]] (NYSE: MPC), the largest petroleum refinery operator in the United States.<ref name="stocktitan">{{cite web |title=Marathon Petroleum Corp. elects Maryann T. Mannen as chairman of the board |url=https://www.stocktitan.net/news/MPC/marathon-petroleum-corp-elects-maryann-t-mannen-as-chairman-of-the-dg132et4gmy3.html |publisher=Stock Titan |date=November 4, 2025 |access-date=2026-02-23}}</ref> She assumed the role of chairman effective January 1, 2026, succeeding Michael J. Hennigan, who retired from the position.<ref name="wfin">{{cite news |date=November 4, 2025 |title=Marathon Petroleum Elects Maryann Mannen Chairman Of The Board |url=https://wfin.com/local-news/marathon-petroleum-elects-maryann-mannen-as-chairman-of-the-board/ |work=WFIN |access-date=2026-02-23}}</ref> Mannen leads a company headquartered in Findlay, Ohio, that operates 13 refineries with over 3 million barrels per calendar day of refining capacity, along with an extensive marketing system of branded fuel stations across the United States.<ref name="mpc-home">{{cite web |title=Marathon Petroleum Corporation |url=https://www.marathonpetroleum.com/ |publisher=Marathon Petroleum Corporation |access-date=2026-02-23}}</ref> In February 2026, she was elected to the board of directors of [[Prudential Financial|Prudential Financial Inc.]] as an independent director, effective May 12, 2026.<ref name="prudential">{{cite news |date=February 10, 2026 |title=Prudential Financial Elects Maryann Mannen to Board of Directors |url=https://news.prudential.com/us-en/latest-news/prudential-news/2026/q1/Prudential-Financial-Elects-Maryann-Mannen-to-Board-of-Directors |work=Prudential Financial |access-date=2026-02-23}}</ref> Her ascent to the top leadership of one of the nation's largest energy companies has placed her among the most prominent executives in the American petroleum industry.


== Career ==
== Career ==
Line 20: Line 17:
=== Marathon Petroleum Corporation ===
=== Marathon Petroleum Corporation ===


Maryann Mannen rose through the executive ranks of Marathon Petroleum Corporation, one of the largest integrated downstream energy companies in the United States. Marathon Petroleum was established as a wholly owned subsidiary of [[Marathon Oil]] before becoming an independent publicly traded company through a corporate spin-off in 2011.<ref name="spinoff">{{cite web |title=Marathon Oil Corporation Completes Spin-off of Marathon Petroleum Corporation |url=http://ir.marathonoil.com/releasedetail.cfm?ReleaseID=651917 |publisher=Marathon Oil Corporation |access-date=2026-02-23}}</ref> The company is headquartered in [[Findlay, Ohio]], where its predecessor entities have maintained operations since 1895.<ref name="history">{{cite web |title=History |url=http://www.marathonpetroleum.com/About_MPC/Corporate_Profile/History/ |publisher=Marathon Petroleum Corporation |access-date=2026-02-23}}</ref>
Maryann Mannen's career has been closely associated with Marathon Petroleum Corporation, one of the largest integrated downstream energy companies in the United States. Marathon Petroleum traces its origins to a collection of small oil companies in Ohio that merged in 1887 to form The Ohio Oil Company, established in Lima, Ohio.<ref name="mpc-history">{{cite web |title=Marathon Petroleum Corporation – History |url=http://www.marathonpetroleum.com/About_MPC/Corporate_Profile/History/ |publisher=Marathon Petroleum Corporation |access-date=2026-02-23}}</ref> The company grew significantly over the following decades, and in 2011 it was spun off from Marathon Oil Corporation as an independent, publicly traded entity.<ref name="spinoff">{{cite web |title=Marathon Oil Corporation Announces Completion of Marathon Petroleum Corporation Spin-off |url=http://ir.marathonoil.com/releasedetail.cfm?ReleaseID=651917 |publisher=Marathon Oil Corporation |access-date=2026-02-23}}</ref>


Marathon Petroleum's operations encompass petroleum refining, marketing, retail, and midstream transportation. The company's marketing system includes branded locations across the United States, operating under both the Marathon and ARCO brands.<ref name="mpcwebsite">{{cite web |title=Marathon Petroleum Corporation |url=https://www.marathonpetroleum.com/ |publisher=Marathon Petroleum Corporation |access-date=2026-02-23}}</ref> MPC also owns the general partner and majority limited partner interest in [[MPLX LP]], a midstream company that owns and operates gathering, processing, and fractionation assets, as well as crude oil and light product transportation and logistics infrastructure.<ref name="mplx">{{cite web |title=MPLX LP |url=https://www.nyse.com/quote/XNYS:MPLX |publisher=New York Stock Exchange |access-date=2026-02-23}}</ref>
Marathon Petroleum's transformation into the nation's largest petroleum refinery operator was cemented by its acquisition of Andeavor on October 1, 2018.<ref name="cnbc-andeavor">{{cite news |title=Marathon Petroleum-Andeavor merger checks the boxes where it counts |url=https://www.cnbc.com/2018/05/01/marathon-petroleum-andeavor-merger-checks-the-boxes-where-it-counts.html |work=CNBC |date=May 1, 2018 |access-date=2026-02-23}}</ref> The combined company operates 13 refineries across the United States with a total refining capacity exceeding 3 million barrels per calendar day.<ref name="refining">{{cite web |title=Marathon Petroleum Corporation – Refining |url=http://www.marathonpetroleum.com/Operations/Refining_and_Marketing/Refining/ |publisher=Marathon Petroleum Corporation |access-date=2026-02-23}}</ref> The company ranked No. 41 on the 2018 Fortune 500 list of the largest United States corporations by total revenue,<ref name="fortune500">{{cite web |title=Fortune 500 |url=http://fortune.com/fortune500/list/ |publisher=Fortune |access-date=2026-02-23}}</ref> and it was ranked as the 138th-largest public company in the world in the 2020 Forbes Global 2000.


The company underwent a major transformation in 2018 with its acquisition of [[Andeavor]] (formerly Tesoro Corporation), which was completed on October 1, 2018. The merger made Marathon Petroleum the largest petroleum refinery operator in the United States, with 13 refineries and over three million barrels per calendar day of total refining capacity.<ref name="cnbc" /> This strategic consolidation positioned the company as a dominant force in the American refining sector. At the time of the merger, analysts noted that the deal addressed key strategic considerations for the company's downstream operations.<ref name="cnbc" />
Marathon Petroleum's operations span refining, marketing, and transportation. Its marketing system includes branded fuel stations across the country operating under the Marathon and ARCO brands, among others.<ref name="stations">{{cite web |title=Marathon Petroleum – Gasoline Stations |url=http://www.marathonpetroleum.com/brand/Stations_and_Stores/Gasoline_with_STP_Additives/ |publisher=Marathon Petroleum Corporation |access-date=2026-02-23}}</ref> The company also owns the general partner and majority limited partner interest in MPLX LP (NYSE: MPLX), a midstream master limited partnership that owns and operates gathering, processing, and fractionation assets, as well as crude oil and light product transportation and logistics infrastructure.<ref name="mplx">{{cite web |title=MPLX LP – NYSE |url=https://www.nyse.com/quote/XNYS:MPLX |publisher=New York Stock Exchange |access-date=2026-02-23}}</ref><ref name="mpc-nyse">{{cite web |title=Marathon Petroleum Corporation – NYSE |url=https://www.nyse.com/quote/XNYS:MPC |publisher=New York Stock Exchange |access-date=2026-02-23}}</ref>


Marathon Petroleum's scale and financial performance have placed it consistently among the largest publicly traded companies globally. The company ranked No. 41 on the 2018 Fortune 500 list of the largest United States corporations by total revenue.<ref name="fortune" /> In the 2020 [[Forbes Global 2000]], Marathon Petroleum was ranked as the 138th-largest public company in the world.<ref name="mpcwebsite" /> The company trades on the [[New York Stock Exchange]] under the ticker symbol MPC and is a component of the [[S&P 500]] index.<ref name="nyse">{{cite web |title=Marathon Petroleum Corporation (MPC) |url=https://www.nyse.com/quote/XNYS:MPC |publisher=New York Stock Exchange |access-date=2026-02-23}}</ref>
=== Rise to CEO ===


=== President and Chief Executive Officer ===
Mannen rose through the executive ranks of Marathon Petroleum over a career spanning multiple leadership positions within the organization. She served as president and chief executive officer of the company, overseeing the full breadth of its refining, marketing, midstream, and retail operations. In this capacity, she was responsible for guiding one of the largest publicly traded energy companies in the United States, with operations that touch virtually every aspect of the downstream petroleum value chain.


Mannen served as president and chief executive officer of Marathon Petroleum Corporation, leading the company's extensive refining, marketing, and midstream operations. In her capacity as CEO, she oversaw a company with a vast operational footprint that includes refining facilities, branded fuel stations, and significant midstream infrastructure through the MPLX LP partnership.<ref name="mpcwebsite" />
=== Election as Chairman of the Board ===


The company's refining operations, which Mannen oversees as CEO, span multiple facilities across the United States. Marathon Petroleum's refineries process crude oil into a variety of petroleum products, and the company's marketing operations distribute fuel through thousands of branded retail locations.<ref name="refining">{{cite web |title=Refining and Marketing |url=http://www.marathonpetroleum.com/Operations/Refining_and_Marketing/Refining/ |publisher=Marathon Petroleum Corporation |access-date=2026-02-23}}</ref> The company also markets gasoline formulated with STP additives through its branded station network.<ref name="stp">{{cite web |title=Gasoline with STP Additives |url=http://www.marathonpetroleum.com/brand/Stations_and_Stores/Gasoline_with_STP_Additives/ |publisher=Marathon Petroleum Corporation |access-date=2026-02-23}}</ref>
On November 4, 2025, Marathon Petroleum Corporation announced that its board of directors had elected Maryann T. Mannen as chairman of the board, effective January 1, 2026.<ref name="stocktitan" /> The announcement came as part of a planned leadership transition, with Michael J. Hennigan retiring from the chairman role.<ref name="wfin" /> Under the new governance structure, John Surma was to continue serving as independent lead director, maintaining the board's independent oversight function alongside Mannen's chairmanship.<ref name="stocktitan" />


=== Chairman of the Board ===
The consolidation of the CEO and chairman roles under Mannen represented a significant expression of confidence by the board in her leadership. As chairman and CEO, Mannen assumed full responsibility for both the strategic direction and governance oversight of a company that operates the largest refining system in the United States.


On November 4, 2025, Marathon Petroleum Corporation announced that its board of directors had elected Maryann T. Mannen as chairman of the board, effective January 1, 2026. The election came as Michael J. Hennigan, who had been serving as executive chairman, retired from the position.<ref name="stocktitan" /> The transition was structured to ensure continuity of leadership, with John Surma continuing in his role as independent lead director of the board.<ref name="stocktitan" /> With this appointment, Mannen assumed the combined roles of president, CEO, and chairman, consolidating the company's top leadership positions.<ref name="wfin">{{cite news |title=Marathon Petroleum Elects Maryann Mannen Chairman Of The Board |url=https://wfin.com/local-news/marathon-petroleum-elects-maryann-mannen-as-chairman-of-the-board/ |work=WFIN |date=November 4, 2025 |access-date=2026-02-23}}</ref>
=== Board Service at Prudential Financial ===


The announcement was reported by local media in Findlay, Ohio, Marathon Petroleum's headquarters city, as well as by national financial media outlets.<ref name="wfin" /> Mannen's elevation to chairman represented a significant milestone in her career at the company, positioning her as the sole leader of one of the largest energy companies in the United States.
On February 10, 2026, Prudential Financial Inc. (NYSE: PRU) announced that Maryann Mannen had been elected to its board of directors as an independent director, with the appointment effective May 12, 2026.<ref name="prudential" /><ref name="bw-prudential">{{cite news |date=February 10, 2026 |title=Prudential Financial Elects Maryann Mannen to Board of Directors |url=https://www.businesswire.com/news/home/20260210263152/en/Prudential-Financial-Elects-Maryann-Mannen-to-Board-of-Directors |work=Business Wire |access-date=2026-02-23}}</ref> Prudential Financial is a global financial services company headquartered in Newark, New Jersey, offering insurance, retirement, and investment management products and services.


=== Prudential Financial Board Appointment ===
Mannen's election to the Prudential board reflected her standing as a senior corporate leader with extensive experience in managing a large, complex, publicly traded corporation.<ref name="tipranks">{{cite news |date=February 10, 2026 |title=Prudential Financial Adds Marathon CEO Maryann Mannen to Board |url=https://www.tipranks.com/news/company-announcements/prudential-financial-adds-marathon-ceo-maryann-mannen-to-board |work=TipRanks |access-date=2026-02-23}}</ref> The appointment expanded her corporate governance responsibilities beyond the energy sector into financial services, one of the largest industries in the American economy.<ref name="sahm">{{cite news |date=February 10, 2026 |title=Prudential Financial Elects Maryann Mannen to Board of Directors |url=https://www.sahmcapital.com/news/content/prudential-financial-elects-maryann-mannen-to-board-of-directors-2026-02-10 |work=Sahm Capital |access-date=2026-02-23}}</ref>


On February 10, 2026, [[Prudential Financial|Prudential Financial Inc.]] (NYSE: PRU) announced that Maryann Mannen had been elected to the company's board of directors as an independent director. The appointment is effective May 12, 2026, at which point she will also join the board's Audit Committee and Investment Committee.<ref name="prudential" />
== Marathon Petroleum Corporation: Company Background ==


Prudential Financial, one of the largest financial services companies in the world headquartered in [[Newark, New Jersey]], noted Mannen's extensive leadership experience in its announcement of the election.<ref name="prudential-pr">{{cite web |title=Prudential Financial Elects Maryann Mannen to Board of Directors |url=https://news.prudential.com/us-en/latest-news/prudential-news/2026/q1/Prudential-Financial-Elects-Maryann-Mannen-to-Board-of-Directors |publisher=Prudential Financial |date=February 10, 2026 |access-date=2026-02-23}}</ref> Financial analysts and news services widely reported the appointment, with coverage noting her concurrent role as president, CEO, and chairman of Marathon Petroleum Corporation.<ref name="tipranks">{{cite web |title=Prudential Financial Adds Marathon CEO Maryann Mannen to Board |url=https://www.tipranks.com/news/company-announcements/prudential-financial-adds-marathon-ceo-maryann-mannen-to-board |publisher=TipRanks |date=February 10, 2026 |access-date=2026-02-23}}</ref><ref name="marketscreener">{{cite web |title=Prudential Financial elects Maryann Mannen to board of directors |url=https://www.marketscreener.com/news/prudential-financial-elects-maryann-mannen-to-board-of-directors-ce7e5adcda8bf023 |publisher=MarketScreener |date=February 10, 2026 |access-date=2026-02-23}}</ref>
Marathon Petroleum Corporation, the company that Mannen leads, has a corporate history spanning well over a century. The company's origins date to 1887, when several small Ohio-based oil companies consolidated to form The Ohio Oil Company in Lima, Ohio.<ref name="mpc-history" /> The Ohio Oil Company quickly became the largest oil producer in the state. By 1889, it had been acquired by the [[Standard Oil]] Trust, and six years later its headquarters was relocated to Findlay, Ohio, where Marathon Petroleum remains headquartered today.<ref name="mpc-history" />


The Prudential board appointment expanded Mannen's corporate governance responsibilities beyond Marathon Petroleum, placing her in an oversight role at a major financial institution with global operations in insurance, investment management, and other financial services.<ref name="sahm">{{cite web |title=Prudential Financial Elects Maryann Mannen to Board of Directors |url=https://www.sahmcapital.com/news/content/prudential-financial-elects-maryann-mannen-to-board-of-directors-2026-02-10 |publisher=Sahm Capital |date=February 10, 2026 |access-date=2026-02-23}}</ref>
In 1906, the company constructed its first oil pipeline, connecting facilities in Martinsville, Illinois, and Preble, Indiana.<ref name="mpc-history" /> Following the [[United States Supreme Court]]'s 1911 order to break up Standard Oil under the [[Sherman Antitrust Act]], The Ohio Oil Company once again became an independent entity. The company expanded its operations by purchasing oil fields outside of Ohio and entered the oil refining business. In 1924, it discovered oil in Texas and acquired Lincoln Oil Refining Company, which included a refinery and 17 brand service stations in Indiana.<ref name="mpc-history" /> Several years later, the company acquired Transcontinental Oil, which brought with it refineries, storage facilities, filling stations, and the Marathon product name that would eventually become the corporate identity.


== Marathon Petroleum Corporation Background ==
The company operated as a subsidiary of Marathon Oil Corporation until June 2011, when it was spun off as an independent, publicly traded company on the [[New York Stock Exchange]].<ref name="spinoff" /> Following the spinoff, Marathon Petroleum pursued an aggressive growth strategy. In 2013 and subsequent years, the company expanded its refining and retail footprint through a series of strategic acquisitions and operational improvements.<ref name="sec-10k">{{cite web |title=Marathon Petroleum Corporation Annual Report (Form 10-K) |url=https://www.sec.gov/Archives/edgar/data/1510295/000151029516000078/mpc-20151231x10k.htm |publisher=U.S. Securities and Exchange Commission |access-date=2026-02-23}}</ref>


Marathon Petroleum Corporation traces its corporate lineage to a number of small oil companies in Ohio that consolidated in 1887 to form The Ohio Oil Company, established in [[Lima, Ohio]]. The Ohio Oil Company became the largest oil producer in the state.<ref name="history" /> By 1889, the company was acquired by the [[Standard Oil Trust]], and six years later its headquarters was relocated to Findlay, Ohio, where Marathon Petroleum remains headquartered.<ref name="history" />
The transformative moment in Marathon Petroleum's modern history came with its acquisition of Andeavor in October 2018, a deal that made the combined entity the largest petroleum refinery operator in the United States.<ref name="cnbc-andeavor" /> The merger roughly doubled Marathon Petroleum's refining capacity, bringing the total to over 3 million barrels per calendar day across 13 refineries.<ref name="refining" /> The acquisition also expanded the company's geographic footprint, adding significant West Coast refining and marketing operations that had previously been operated under the Andeavor and Tesoro brands.


In 1906, the company constructed its first oil pipeline, connecting facilities in [[Martinsville, Illinois]], and [[Preble, Indiana]].<ref name="history" /> Following the [[United States Supreme Court]]'s 1911 order that [[Standard Oil]] be dissolved under the [[Sherman Antitrust Act]], Ohio Oil again became an independent company. It subsequently expanded its operations by acquiring oil fields outside of Ohio and began petroleum refining activities.<ref name="history" />
As of 2025, Marathon Petroleum's integrated operations encompass refining and marketing through its direct operations, midstream logistics through its majority-owned subsidiary MPLX LP, and a nationwide network of branded retail fuel stations.<ref name="mpc-home" /> The company's common stock trades on the New York Stock Exchange under the ticker symbol MPC,<ref name="mpc-nyse" /> and it is a component of the [[S&P 500]] index.


A pivotal year in the company's history was 1924, when Ohio Oil discovered oil in [[Texas]] and acquired the Lincoln Oil Refining Company. The Lincoln acquisition included a refinery and 17 branded service stations in [[Indiana]].<ref name="history" /> Several years later, Ohio Oil acquired Transcontinental Oil, a deal that included refineries, storage facilities, filling stations, and—critically—the Marathon product name that would eventually become the company's identity.<ref name="history" />
== Recognition ==


The modern Marathon Petroleum Corporation was created on June 30, 2011, when Marathon Oil Corporation completed the spin-off of its downstream refining, marketing, and transportation operations into an independent publicly traded company.<ref name="spinoff" /> This spin-off allowed Marathon Petroleum to operate independently and pursue its own strategic direction in the downstream petroleum sector.
Mannen's election as both chairman and CEO of Marathon Petroleum Corporation placed her at the helm of one of the largest companies in the United States by revenue, as Marathon Petroleum has consistently ranked among the top 50 companies on the Fortune 500 list.<ref name="fortune500" /> Her appointment to the Prudential Financial board of directors in February 2026 further underscored her recognition as a leader in American corporate governance circles.<ref name="prudential" /><ref name="bw-prudential" />


The 2018 acquisition of Andeavor marked the most transformative event in the company's modern history. The merger, completed on October 1, 2018, brought together two of the largest independent refining companies in the United States. The combined entity's 13 refineries and capacity exceeding three million barrels per calendar day established Marathon Petroleum as the preeminent refining company in the nation.<ref name="cnbc" /> The company's extensive refining network processes crude oil into transportation fuels, petrochemicals, and other petroleum-derived products distributed through its branded station network.<ref name="refining" />
The announcement of Mannen's chairmanship received coverage in financial and regional news outlets, including those based in the Findlay, Ohio, area where Marathon Petroleum is headquartered.<ref name="wfin" /> Her Prudential board appointment was reported by multiple financial news services, including Business Wire, TipRanks, MarketScreener, and TradingView, reflecting the significance of the appointment in the financial services and investment communities.<ref name="tipranks" /><ref name="marketscreener">{{cite news |date=February 10, 2026 |title=Prudential Financial elects Maryann Mannen to board of directors |url=https://www.marketscreener.com/news/prudential-financial-elects-maryann-mannen-to-board-of-directors-ce7e5adcda8bf023 |work=MarketScreener |access-date=2026-02-23}}</ref><ref name="tradingview">{{cite news |date=February 10, 2026 |title=Prudential Financial Elects Maryann Mannen To Board Of Directors |url=https://www.tradingview.com/news/reuters.com,2026:newsml_TUA64MBMV:0-prudential-financial-elects-maryann-mannen-to-board-of-directors/ |work=TradingView |access-date=2026-02-23}}</ref>


Marathon Petroleum's midstream operations are conducted primarily through MPLX LP, in which MPC holds the general partner interest and a majority limited partner interest. MPLX owns and operates a network of gathering, processing, and fractionation assets, along with crude oil and light product transportation and logistics infrastructure that supports both Marathon Petroleum's refining operations and third-party customers.<ref name="mplx" />
As chairman and CEO of a Fortune 500 company, Mannen is among a small number of women leading major American energy companies, a sector in which female representation at the highest executive levels has historically been limited.


The company files annual reports with the [[U.S. Securities and Exchange Commission]], providing detailed financial and operational disclosures to investors and regulators.<ref name="sec">{{cite web |title=Marathon Petroleum Corporation Annual Report (Form 10-K) |url=https://www.sec.gov/Archives/edgar/data/1510295/000151029516000078/mpc-20151231x10k.htm |publisher=U.S. Securities and Exchange Commission |access-date=2026-02-23}}</ref>
== Legacy ==


== Recognition ==
Maryann Mannen's leadership of Marathon Petroleum Corporation comes at a consequential period for the American petroleum industry, as the energy sector faces evolving market dynamics, regulatory environments, and the broader global conversation about energy transition. As head of the nation's largest refinery operator, her decisions carry implications for fuel supply, employment, and energy policy across the United States.


Maryann Mannen's appointment as CEO and subsequently as chairman of Marathon Petroleum Corporation placed her among the most prominent women leading [[Fortune 500]] companies in the United States. Marathon Petroleum's ranking at No. 41 on the 2018 Fortune 500 list and its position as the 138th-largest public company in the world in the 2020 Forbes Global 2000 underscore the scale of the enterprise under her leadership.<ref name="fortune" />
Marathon Petroleum, under its succession of leaders including Mannen, has grown from a regional refining operation into a national petroleum powerhouse. The company's acquisition of Andeavor in 2018 was one of the largest deals in the history of the American downstream petroleum sector, and the integration of that acquisition shaped the company that Mannen now leads.<ref name="cnbc-andeavor" /> With over 3 million barrels per calendar day of refining capacity and a nationwide network of branded fuel stations, Marathon Petroleum's operational scale is unmatched among American refiners.<ref name="refining" />


Her election to the Prudential Financial board of directors in February 2026 further recognized her standing in American corporate governance. Prudential's announcement specifically identified her for service on the board's Audit Committee and Investment Committee, positions that reflect confidence in her financial and operational expertise.<ref name="prudential" /><ref name="prudential-pr" />
Mannen's dual role as chairman and CEO, combined with her appointment to the board of Prudential Financial, positions her as a figure of influence in both the energy and financial services industries. The breadth of her corporate responsibilities reflects the interconnected nature of American big business, where leaders of major industrial companies frequently serve on the boards of companies in other sectors, contributing governance expertise and strategic perspective across industries.<ref name="sahm" />
 
The transition of Marathon Petroleum's chairmanship to Mannen received coverage from financial news services, industry publications, and local media in the Findlay, Ohio, region, reflecting the significance of the leadership change at one of the nation's largest energy companies.<ref name="wfin" /><ref name="stocktitan" /> Multiple financial analysis platforms reported on her Prudential board election, noting her dual corporate leadership roles as indicative of her prominence in the American business community.<ref name="tipranks" /><ref name="marketscreener" /><ref name="sahm" />


== References ==
== References ==
Line 80: Line 75:
[[Category:American chief executives of energy companies]]
[[Category:American chief executives of energy companies]]
[[Category:Marathon Petroleum people]]
[[Category:Marathon Petroleum people]]
[[Category:Living people]]
[[Category:People from Findlay, Ohio]]
[[Category:People from Findlay, Ohio]]
[[Category:Living people]]
[[Category:Fortune 500 chief executive officers]]
[[Category:American women in business]]
[[Category:Corporate directors]]
<html><script type="application/ld+json">
<html><script type="application/ld+json">
{
{

Latest revision as of 04:36, 24 February 2026




Maryann T. Mannen
NationalityAmerican
OccupationCorporate executive
TitlePresident, CEO, and Chairman of the Board
EmployerMarathon Petroleum Corporation
Known forCEO and Chairman of Marathon Petroleum Corporation
Website[marathonpetroleum.com Official site]

Maryann T. Mannen is an American corporate executive who serves as president, chief executive officer, and chairman of the board of Marathon Petroleum Corporation (NYSE: MPC), the largest petroleum refinery operator in the United States.[1] She assumed the role of chairman effective January 1, 2026, succeeding Michael J. Hennigan, who retired from the position.[2] Mannen leads a company headquartered in Findlay, Ohio, that operates 13 refineries with over 3 million barrels per calendar day of refining capacity, along with an extensive marketing system of branded fuel stations across the United States.[3] In February 2026, she was elected to the board of directors of Prudential Financial Inc. as an independent director, effective May 12, 2026.[4] Her ascent to the top leadership of one of the nation's largest energy companies has placed her among the most prominent executives in the American petroleum industry.

Career

Marathon Petroleum Corporation

Maryann Mannen's career has been closely associated with Marathon Petroleum Corporation, one of the largest integrated downstream energy companies in the United States. Marathon Petroleum traces its origins to a collection of small oil companies in Ohio that merged in 1887 to form The Ohio Oil Company, established in Lima, Ohio.[5] The company grew significantly over the following decades, and in 2011 it was spun off from Marathon Oil Corporation as an independent, publicly traded entity.[6]

Marathon Petroleum's transformation into the nation's largest petroleum refinery operator was cemented by its acquisition of Andeavor on October 1, 2018.[7] The combined company operates 13 refineries across the United States with a total refining capacity exceeding 3 million barrels per calendar day.[8] The company ranked No. 41 on the 2018 Fortune 500 list of the largest United States corporations by total revenue,[9] and it was ranked as the 138th-largest public company in the world in the 2020 Forbes Global 2000.

Marathon Petroleum's operations span refining, marketing, and transportation. Its marketing system includes branded fuel stations across the country operating under the Marathon and ARCO brands, among others.[10] The company also owns the general partner and majority limited partner interest in MPLX LP (NYSE: MPLX), a midstream master limited partnership that owns and operates gathering, processing, and fractionation assets, as well as crude oil and light product transportation and logistics infrastructure.[11][12]

Rise to CEO

Mannen rose through the executive ranks of Marathon Petroleum over a career spanning multiple leadership positions within the organization. She served as president and chief executive officer of the company, overseeing the full breadth of its refining, marketing, midstream, and retail operations. In this capacity, she was responsible for guiding one of the largest publicly traded energy companies in the United States, with operations that touch virtually every aspect of the downstream petroleum value chain.

Election as Chairman of the Board

On November 4, 2025, Marathon Petroleum Corporation announced that its board of directors had elected Maryann T. Mannen as chairman of the board, effective January 1, 2026.[1] The announcement came as part of a planned leadership transition, with Michael J. Hennigan retiring from the chairman role.[2] Under the new governance structure, John Surma was to continue serving as independent lead director, maintaining the board's independent oversight function alongside Mannen's chairmanship.[1]

The consolidation of the CEO and chairman roles under Mannen represented a significant expression of confidence by the board in her leadership. As chairman and CEO, Mannen assumed full responsibility for both the strategic direction and governance oversight of a company that operates the largest refining system in the United States.

Board Service at Prudential Financial

On February 10, 2026, Prudential Financial Inc. (NYSE: PRU) announced that Maryann Mannen had been elected to its board of directors as an independent director, with the appointment effective May 12, 2026.[4][13] Prudential Financial is a global financial services company headquartered in Newark, New Jersey, offering insurance, retirement, and investment management products and services.

Mannen's election to the Prudential board reflected her standing as a senior corporate leader with extensive experience in managing a large, complex, publicly traded corporation.[14] The appointment expanded her corporate governance responsibilities beyond the energy sector into financial services, one of the largest industries in the American economy.[15]

Marathon Petroleum Corporation: Company Background

Marathon Petroleum Corporation, the company that Mannen leads, has a corporate history spanning well over a century. The company's origins date to 1887, when several small Ohio-based oil companies consolidated to form The Ohio Oil Company in Lima, Ohio.[5] The Ohio Oil Company quickly became the largest oil producer in the state. By 1889, it had been acquired by the Standard Oil Trust, and six years later its headquarters was relocated to Findlay, Ohio, where Marathon Petroleum remains headquartered today.[5]

In 1906, the company constructed its first oil pipeline, connecting facilities in Martinsville, Illinois, and Preble, Indiana.[5] Following the United States Supreme Court's 1911 order to break up Standard Oil under the Sherman Antitrust Act, The Ohio Oil Company once again became an independent entity. The company expanded its operations by purchasing oil fields outside of Ohio and entered the oil refining business. In 1924, it discovered oil in Texas and acquired Lincoln Oil Refining Company, which included a refinery and 17 brand service stations in Indiana.[5] Several years later, the company acquired Transcontinental Oil, which brought with it refineries, storage facilities, filling stations, and the Marathon product name that would eventually become the corporate identity.

The company operated as a subsidiary of Marathon Oil Corporation until June 2011, when it was spun off as an independent, publicly traded company on the New York Stock Exchange.[6] Following the spinoff, Marathon Petroleum pursued an aggressive growth strategy. In 2013 and subsequent years, the company expanded its refining and retail footprint through a series of strategic acquisitions and operational improvements.[16]

The transformative moment in Marathon Petroleum's modern history came with its acquisition of Andeavor in October 2018, a deal that made the combined entity the largest petroleum refinery operator in the United States.[7] The merger roughly doubled Marathon Petroleum's refining capacity, bringing the total to over 3 million barrels per calendar day across 13 refineries.[8] The acquisition also expanded the company's geographic footprint, adding significant West Coast refining and marketing operations that had previously been operated under the Andeavor and Tesoro brands.

As of 2025, Marathon Petroleum's integrated operations encompass refining and marketing through its direct operations, midstream logistics through its majority-owned subsidiary MPLX LP, and a nationwide network of branded retail fuel stations.[3] The company's common stock trades on the New York Stock Exchange under the ticker symbol MPC,[12] and it is a component of the S&P 500 index.

Recognition

Mannen's election as both chairman and CEO of Marathon Petroleum Corporation placed her at the helm of one of the largest companies in the United States by revenue, as Marathon Petroleum has consistently ranked among the top 50 companies on the Fortune 500 list.[9] Her appointment to the Prudential Financial board of directors in February 2026 further underscored her recognition as a leader in American corporate governance circles.[4][13]

The announcement of Mannen's chairmanship received coverage in financial and regional news outlets, including those based in the Findlay, Ohio, area where Marathon Petroleum is headquartered.[2] Her Prudential board appointment was reported by multiple financial news services, including Business Wire, TipRanks, MarketScreener, and TradingView, reflecting the significance of the appointment in the financial services and investment communities.[14][17][18]

As chairman and CEO of a Fortune 500 company, Mannen is among a small number of women leading major American energy companies, a sector in which female representation at the highest executive levels has historically been limited.

Legacy

Maryann Mannen's leadership of Marathon Petroleum Corporation comes at a consequential period for the American petroleum industry, as the energy sector faces evolving market dynamics, regulatory environments, and the broader global conversation about energy transition. As head of the nation's largest refinery operator, her decisions carry implications for fuel supply, employment, and energy policy across the United States.

Marathon Petroleum, under its succession of leaders including Mannen, has grown from a regional refining operation into a national petroleum powerhouse. The company's acquisition of Andeavor in 2018 was one of the largest deals in the history of the American downstream petroleum sector, and the integration of that acquisition shaped the company that Mannen now leads.[7] With over 3 million barrels per calendar day of refining capacity and a nationwide network of branded fuel stations, Marathon Petroleum's operational scale is unmatched among American refiners.[8]

Mannen's dual role as chairman and CEO, combined with her appointment to the board of Prudential Financial, positions her as a figure of influence in both the energy and financial services industries. The breadth of her corporate responsibilities reflects the interconnected nature of American big business, where leaders of major industrial companies frequently serve on the boards of companies in other sectors, contributing governance expertise and strategic perspective across industries.[15]

References

  1. ↑ 1.0 1.1 1.2 "Marathon Petroleum Corp. elects Maryann T. Mannen as chairman of the board".Stock Titan.November 4, 2025.https://www.stocktitan.net/news/MPC/marathon-petroleum-corp-elects-maryann-t-mannen-as-chairman-of-the-dg132et4gmy3.html.Retrieved 2026-02-23.
  2. ↑ 2.0 2.1 2.2 "Marathon Petroleum Elects Maryann Mannen Chairman Of The Board".WFIN.November 4, 2025.https://wfin.com/local-news/marathon-petroleum-elects-maryann-mannen-as-chairman-of-the-board/.Retrieved 2026-02-23.
  3. ↑ 3.0 3.1 "Marathon Petroleum Corporation".Marathon Petroleum Corporation.https://www.marathonpetroleum.com/.Retrieved 2026-02-23.
  4. ↑ 4.0 4.1 4.2 "Prudential Financial Elects Maryann Mannen to Board of Directors".Prudential Financial.February 10, 2026.https://news.prudential.com/us-en/latest-news/prudential-news/2026/q1/Prudential-Financial-Elects-Maryann-Mannen-to-Board-of-Directors.Retrieved 2026-02-23.
  5. ↑ 5.0 5.1 5.2 5.3 5.4 "Marathon Petroleum Corporation – History".Marathon Petroleum Corporation.http://www.marathonpetroleum.com/About_MPC/Corporate_Profile/History/.Retrieved 2026-02-23.
  6. ↑ 6.0 6.1 "Marathon Oil Corporation Announces Completion of Marathon Petroleum Corporation Spin-off".Marathon Oil Corporation.http://ir.marathonoil.com/releasedetail.cfm?ReleaseID=651917.Retrieved 2026-02-23.
  7. ↑ 7.0 7.1 7.2 "Marathon Petroleum-Andeavor merger checks the boxes where it counts".CNBC.May 1, 2018.https://www.cnbc.com/2018/05/01/marathon-petroleum-andeavor-merger-checks-the-boxes-where-it-counts.html.Retrieved 2026-02-23.
  8. ↑ 8.0 8.1 8.2 "Marathon Petroleum Corporation – Refining".Marathon Petroleum Corporation.http://www.marathonpetroleum.com/Operations/Refining_and_Marketing/Refining/.Retrieved 2026-02-23.
  9. ↑ 9.0 9.1 "Fortune 500".Fortune.http://fortune.com/fortune500/list/.Retrieved 2026-02-23.
  10. ↑ "Marathon Petroleum – Gasoline Stations".Marathon Petroleum Corporation.http://www.marathonpetroleum.com/brand/Stations_and_Stores/Gasoline_with_STP_Additives/.Retrieved 2026-02-23.
  11. ↑ "MPLX LP – NYSE".New York Stock Exchange.https://www.nyse.com/quote/XNYS:MPLX.Retrieved 2026-02-23.
  12. ↑ 12.0 12.1 "Marathon Petroleum Corporation – NYSE".New York Stock Exchange.https://www.nyse.com/quote/XNYS:MPC.Retrieved 2026-02-23.
  13. ↑ 13.0 13.1 "Prudential Financial Elects Maryann Mannen to Board of Directors".Business Wire.February 10, 2026.https://www.businesswire.com/news/home/20260210263152/en/Prudential-Financial-Elects-Maryann-Mannen-to-Board-of-Directors.Retrieved 2026-02-23.
  14. ↑ 14.0 14.1 "Prudential Financial Adds Marathon CEO Maryann Mannen to Board".TipRanks.February 10, 2026.https://www.tipranks.com/news/company-announcements/prudential-financial-adds-marathon-ceo-maryann-mannen-to-board.Retrieved 2026-02-23.
  15. ↑ 15.0 15.1 "Prudential Financial Elects Maryann Mannen to Board of Directors".Sahm Capital.February 10, 2026.https://www.sahmcapital.com/news/content/prudential-financial-elects-maryann-mannen-to-board-of-directors-2026-02-10.Retrieved 2026-02-23.
  16. ↑ "Marathon Petroleum Corporation Annual Report (Form 10-K)".U.S. Securities and Exchange Commission.https://www.sec.gov/Archives/edgar/data/1510295/000151029516000078/mpc-20151231x10k.htm.Retrieved 2026-02-23.
  17. ↑ "Prudential Financial elects Maryann Mannen to board of directors".MarketScreener.February 10, 2026.https://www.marketscreener.com/news/prudential-financial-elects-maryann-mannen-to-board-of-directors-ce7e5adcda8bf023.Retrieved 2026-02-23.
  18. ↑ "Prudential Financial Elects Maryann Mannen To Board Of Directors".TradingView.February 10, 2026.https://www.tradingview.com/news/reuters.com,2026:newsml_TUA64MBMV:0-prudential-financial-elects-maryann-mannen-to-board-of-directors/.Retrieved 2026-02-23.

Retrieved from "https://biography.wiki/index.php?title=Maryann_Mannen&oldid=293"