Superior Oil Company
A historic American independent oil and natural-gas exploration and production company acquired by Mobil in 1984.
Last updated August 31, 2026
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Overview
Superior Oil Company was an American independent oil company established in 1921 by William Myron Keck in Coalinga, California. Keck had built his reputation as an oil prospector and drilling contractor, often accepting oil leases instead of cash for contract work. After accumulating sufficient acreage and interests, he created Superior as a drilling and exploration enterprise. The company initially operated as a drilling contractor but soon developed into an integrated exploration and production business focused on crude oil and natural gas rather than refining or retail marketing. Superior became known for applying new geological and drilling techniques. In 1930 it was the first company reported to have successfully used directional drilling in California. By 1931, its operations extended beyond California to Texas, Oklahoma, Nebraska, Louisiana, and Venezuela. In 1933, the company became an early user of reflection seismography for locating underground hydrocarbon structures, helping establish a more scientific approach to exploration. Superior also became a major participant in the early development of offshore production in the Gulf of Mexico. Working with Pure Oil, it constructed an offshore platform off the Louisiana coast in 1938. The project is widely recognized as the first offshore oil platform of its kind and helped demonstrate the commercial potential of offshore drilling. Superior subsequently set depth records in Gulf drilling and became one of the leading independent producers in the United States. The company’s growth was closely associated with the Keck family. William Myron Keck retained strong control after Superior became publicly traded and led the business until his death in 1964. His sons William M. Keck Jr. and Howard B. Keck continued the family’s influence. Howard B. Keck was chairman from 1963 until 1981 and retained substantial control over the board after stepping down from the chairmanship. Leadership changes during the early 1980s occurred amid disagreements among major shareholders and questions about the company’s strategic direction. Superior continued to concentrate on upstream activities. Unlike many large oil companies, it did not operate significant petroleum refining and marketing businesses. During the 1970s it also investigated oil shale and developed the Superior multimineral process, reflecting the industry’s interest in alternative hydrocarbon resources during a period of energy insecurity. The company remained a large independent producer, reporting substantial domestic oil and natural-gas reserves in the early 1980s. Corporate-control disputes eventually preceded the company’s sale. In 1983, Howard B. Keck announced that he wanted to sell his stake, while his sister Willametta Keck Day had led a shareholder effort that changed Superior’s bylaws to require management to consider takeover proposals. In March 1984, Mobil Corporation announced an agreement to acquire the Keck family’s approximately 22 percent stake and to offer the same price to the remaining shareholders. The transaction valued Superior at approximately $5.7 billion. The acquisition was completed in September 1984, when Superior, then headquartered in Houston, became a wholly owned Mobil subsidiary. Superior subsequently ceased to exist as an independent corporate entity, and its operations were absorbed into Mobil. Mobil later became part of ExxonMobil.
History
William Myron Keck founded Superior Oil Company in 1921 at Coalinga, California. Before establishing the company, Keck had worked as a roustabout in Pennsylvania and later became a California drilling contractor and oil speculator. He frequently accepted leases as compensation, allowing him to build a portfolio of producing interests. His successful projects included wells near Torrance, Huntington Beach, and Kettleman Hills. Superior was created after Keck had accumulated enough leases and operational experience to establish an independent firm. The company began as a drilling contractor and expanded into exploration and production. Its early history was marked by experimentation with methods that later became important throughout the petroleum industry. In 1930 Superior successfully used directional drilling in California. The technique allowed wells to be steered toward geological targets that could not be reached efficiently through a purely vertical bore. In 1933, Superior also became an early adopter of reflection seismography, using reflected sound waves to identify underground structures that might contain hydrocarbons. Superior moved significant corporate activity to Houston, Texas, as the Gulf Coast became increasingly important to the American oil industry. By 1931 it already had wells in Texas, Oklahoma, Nebraska, Louisiana, and Venezuela. The company became particularly prominent in offshore drilling. In cooperation with Pure Oil, it built an offshore platform off the Louisiana coast in 1938. The project is generally described as the first offshore oil platform in the Gulf of Mexico and an important milestone in the development of modern offshore production. Superior later drilled progressively deeper Gulf wells and became one of the most important independent producers in the United States. Its Venezuelan activity also gave the company an unusually broad international profile for an independent producer of its era. Keck maintained highly centralized control over Superior. Although the company went public, he retained control of its stock and managed the business in a personally directed style. After his death in 1964, his family continued to dominate the company. His son William M. Keck Jr. became chief executive, while his second son Howard B. Keck served as chairman from 1963 to 1981. Some shares were placed in trust for educational and religious institutions, including the University of Southern California, Pomona College, Occidental College, and the Episcopal Church of Our Saviour in San Gabriel, California. Superior’s core business remained upstream oil and gas. It did not build a major refining or marketing network, distinguishing it from vertically integrated oil companies. In the 1970s, the company explored oil shale and worked on the Superior multimineral process. This research formed part of the broader industry response to concerns about petroleum supply and the possibility of extracting hydrocarbons and minerals from shale deposits. The company experienced leadership and shareholder tensions in the early 1980s. Howard B. Keck retired as chairman in 1981 but continued to exert influence over the board. Chairman and chief executive Joseph E. Reid resigned in September 1981 and was succeeded by Fred C. Ackman, who also remained president. In 1983, Keck stepped down as a director while retaining a significant shareholding. His sister Willametta Keck Day had led a shareholder revolt that produced bylaw changes requiring management to consider takeover proposals. Keck later reversed his opposition to the changes and indicated that he wished to sell his stake. The Keck family approached Mobil Corporation about a sale. In March 1984, Mobil disclosed an agreement to acquire roughly 22 percent of Superior held by the family and to extend the same per-share offer to other shareholders. The transaction was valued at about $5.7 billion and was described at the time as one of the largest oil mergers. Completion in September 1984 made Superior a wholly owned Mobil subsidiary. Superior’s separate corporate identity and independent operations were subsequently absorbed into Mobil. Mobil later became part of ExxonMobil. The former Superior Oil Company Building in Los Angeles, completed in the 1950s, remains associated with the company’s history and with the architectural legacy of the Keck family.
- 1984
Acquisition by Mobil completed
[1]Mobil completes its acquisition of Superior, which becomes a wholly owned subsidiary and ceases to operate independently.
- 1970
Oil-shale research
[1]During the 1970s, Superior develops the Superior multimineral process for oil-shale resources.
- 1964
Death of founder William Myron Keck
[1]Keck dies after leading Superior for more than four decades; family control continues through his sons.
- 1955
Superior Oil Company Building completed
[1]The Keck family’s marble-clad Los Angeles office building, designed by Claud Beelman, is completed.
- 1938
Early Gulf of Mexico offshore platform
[1]Superior and Pure Oil construct an offshore platform off Louisiana, an early landmark in offshore oil production.
- 1933
Reflection seismography adopted
[1]The company becomes an early user of reflection seismography for hydrocarbon exploration.
- 1931
Multi-state and Venezuelan expansion
[1]Superior operates wells in Texas, Oklahoma, Nebraska, Louisiana, and Venezuela.
- 1930
Directional drilling breakthrough
[1]Superior becomes the first company reported to successfully use directional drilling in California.
- 1921
Superior Oil Company is founded
[1]William Myron Keck establishes Superior Oil Company in Coalinga, California, initially as a drilling contracting business.
Products and positioning
Independent upstream oil and natural-gas producer known for exploration technology, deep drilling, and early offshore development.
Upstream petroleum · 1921
Crude oil
Crude oil was one of Superior Oil’s principal outputs. The company explored for and produced petroleum in California and multiple other American states, including Texas, Oklahoma, Nebraska, and Louisiana. Its development of directional drilling, seismic exploration, and offshore production supported its role as a technically progressive independent producer. Superior did not maintain the large refining and retail-marketing operations associated with vertically integrated oil majors.
Upstream petroleum · 1921
Natural gas
Natural-gas exploration and production formed a major part of Superior’s upstream portfolio. By the early 1980s, the company held substantial domestic natural-gas reserves and operated across several major producing regions. Gas was produced alongside crude oil through Superior’s exploration and production activities rather than sold through a branded consumer network.
Offshore oil and gas · 1938
Offshore Gulf of Mexico production
Superior was an early independent participant in offshore Gulf of Mexico drilling. Its 1938 work with Pure Oil on an offshore Louisiana platform helped establish a model for producing petroleum from waters beyond the coastline. The company subsequently pursued deep offshore wells and set drilling-depth records in the Gulf, making offshore exploration one of its defining technical achievements.
Oil shale technology · 1970
Superior multimineral process
The Superior multimineral process was an oil-shale technology developed during the 1970s. It reflected the company’s effort to investigate nonconventional hydrocarbon resources and possible recovery of multiple valuable components from shale. The process did not become a continuing independent commercial product after Superior was acquired by Mobil.
Brand decisions
1984
Accept acquisition by Mobil CorporationM&ABackground
Shareholder divisions, the Keck family’s desire to sell its stake, and Superior’s position as a large independent producer created an opening for a takeover. The Keck family held approximately 22 percent of the company and approached Mobil about a transaction.
Action taken
Mobil agreed to acquire the family’s shares and offered the same price to the remaining shareholders. The acquisition was completed in September 1984, making Superior a wholly owned Mobil subsidiary.
Aftermath
Superior lost its independent corporate identity and was absorbed into Mobil. The transaction was valued at approximately $5.7 billion and ranked among the largest oil mergers of its period.
Transaction value. $5.7 billion (1984)
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