Marathon Oil stock leaves the NYSE after ConocoPhillips deal
Published on 09/29/2026 at 12:37 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS
Marathon Oil stock left the NYSE after ConocoPhillips completed its acquisition of Marathon Oil Corporation, turning MRO from a standalone listed equity into a wholly owned subsidiary. The corporate action, rather than a new operating update, now defines the investment history of Marathon Oil.
ConocoPhillips changes MRO status
ConocoPhillips identifies the transaction as the completion of its acquisition of Marathon Oil Corporation. The buyer integrated Marathon Oil's upstream assets into its broader exploration and production portfolio, while the former MRO security moved out of the public-market structure.
Who Brands reports that the acquisition closed on November 22, 2024, with a transaction value of USD 22.5 billion. The date places the end of Marathon Oil's independent listing firmly in the historical record rather than in the current earnings cycle.
Historical figures show the operating base
Before the transaction, Marathon Oil reported Q3 2024 revenue of USD 1.8 billion and diluted EPS of USD 0.64, according to GetSignal. In Q2 2024, the same source listed revenue of USD 1.7 billion and diluted EPS of USD 0.63, so quarterly revenue increased by USD 0.1 billion and EPS by USD 0.01 before the acquisition.
The figures describe Marathon Oil's final standalone operating profile. Its business centered on exploration, development and production of crude oil, natural gas liquids and natural gas, with operations in the United States and international markets.
Identity matters for MRO records
IT Boltwise identifies Marathon Oil as ISIN US5658491064 with ticker MRO and distinguishes it from Marathon Petroleum, whose ticker is MPC and whose ISIN is US56585A1025. That distinction is material because the two companies operated in different parts of the energy value chain.
For investors reviewing historical portfolios, MRO therefore belongs to Marathon Oil's former NYSE listing and to the ConocoPhillips acquisition record. Marathon Petroleum data must be kept separate from Marathon Oil's reported results and corporate history.
Marathon Oil identity and status
- Company: Marathon Oil Corporation
- ISIN: US5658491064
- Ticker: MRO
- Primary exchange: NYSE, historical listing
- Sector / Industry: Energy / Oil and Gas Exploration and Production
