Marathon Oil stock joined ConocoPhillips in a USD 22.5 billion deal

Published on 09/30/2026 at 12:02 | Editorial responsibility: Rafael Müller, Editor-in-Chief AD HOC NEWS

Marathon Oil stock joined ConocoPhillips after a USD 22.5 billion acquisition completed in November 2024. Historical Q3 2024 revenue beat estimates.

Ölfeld mit Pumpjacks und Bohrturm bei Sonnenuntergang, symbolisch für Marathon Oil — Marathon Oil (US5658491064): fotorealistisches Ölfeld bei Sonnenuntergang zeigt Pumpjacks, Bohrturm und Pipelines in weiter Wüstenlandschaft, Illustration mit AI erstellt.

Marathon Oil stock (ISIN US5658491064) joined ConocoPhillips in a USD 22.5 billion acquisition completed in November 2024, ending Marathon Oil Corporation's independent public-company chapter. ConocoPhillips continues to identify the transaction in its investor materials.

USD 22.5 billion changed ownership

Britannica reports that ConocoPhillips announced the USD 22.5 billion deal in May 2024 and completed the acquisition in November 2024. The transaction transferred Marathon Oil's exploration and production assets into a larger upstream portfolio.

The history matters because the Marathon name covers two separate corporate paths. A 2011 split created Marathon Oil as the upstream exploration and production company, while Marathon Petroleum became the downstream refining and marketing company, according to Britannica.

The MRO identity remains distinct

IT Boltwise identifies Marathon Oil with ticker MRO, ISIN US5658491064 and the NYSE listing. The same report distinguishes those identifiers from Marathon Petroleum's ticker MPC and ISIN US56585A1025.

That distinction is material for stock databases and portfolio histories. A Marathon label alone does not identify the issuer, because the 2011 separation created two energy companies with different operating models and securities.

Historical earnings set a baseline

Before the acquisition, Marathon Oil's Q3 2024 results provided a clear operating reference: revenue reached USD 1.8 billion versus USD 1.6 billion expected, while EPS was USD 0.64 versus USD 0.63 expected, according to GetSignal.

Marathon Oil stock is now a legacy reference

For investors reviewing historical transactions, Marathon Oil stock should be tied to the MRO identifier and the 2024 ConocoPhillips acquisition rather than to Marathon Petroleum's still separate refining business. The USD 22.5 billion deal and the November 2024 completion date define the key transition point.