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2026 Who Brands. All information is provided for educational purposes. Brand names and logos are trademarks of their respective owners.

  1. Home
  2. Brands
  3. Energy & Utilities
  4. Diamond Shamrock
Diamond Shamrock logo
Energy & Utilities

Who Owns Diamond Shamrock?

Diamond Shamrock is a fuel station brand owned by Valero Energy Corporation, a publicly traded American petroleum refining company founded in 1980 and headquartered in San Antonio, Texas, trading on NYSE under ticker VLO. The Diamond Shamrock name traces to the 1967 merger of Diamond Alkali and Shamrock Oil. Valero acquired the company in 2001 and maintains the brand at stations concentrated in Texas, California, and the Southwest.

Parent Company

Valero Energy Corporation

Acquired

2001

Status

Publicly Traded

Headquarters

San Antonio, Texas, USA

Diamond Shamrock Timeline

1967

Diamond Shamrock

Founded by Diamond Alkali Company, Shamrock Oil and Gas Company

Founded
2001
Acquired by Valero Energy Corporation

Valero Energy Corporation acquired Diamond Shamrock

Acquired
mid rangemass marketUnited StatesunisexOfficial Website

Who Owns Diamond Shamrock?

  • Parent Company: Valero Energy Corporation
  • Ownership Type: Wholly owned
  • Acquisition Year: 2001
  • Company Type: Publicly Traded
  • Stock Ticker: NYSE: VLO
BrandParent CompanyOwnership Type
Diamond ShamrockValero Energy CorporationWholly owned

History of Diamond Shamrock

  • Founded: 1967
  • Founders: Diamond Alkali Company, Shamrock Oil and Gas Company
  • Acquired by Valero Energy Corporation: 2001

Diamond Shamrock Corporation formed on December 1, 1967, when Cleveland-based Diamond Alkali merged with Shamrock Oil and Gas of Amarillo, Texas. The Shamrock name had Texas heritage dating to the 1920s and the Shamrock refinery in Sunray, Texas.

The company grew into a significant Southwest refiner and marketer, operating in 19 states by the mid-1980s and ranking among America's twenty largest energy companies. It spun off its refining and marketing operations as Diamond Shamrock R&M in 1987, later reuniting and merging with Canada's Ultramar in 1996 to form Ultramar Diamond Shamrock.

Valero Energy acquired Ultramar Diamond Shamrock in 2001. Between 2005 and 2008, Valero converted most Diamond Shamrock stations to the Valero brand, though the Diamond Shamrock name persisted at scores of locations and saw a brand revival in the 2020s, with stations continuing to operate in Texas, California, and elsewhere as of 2026.

The former company's convenience store chain, Corner Store, was spun off into CST Brands in 2013 and later absorbed by Alimentation Couche-Tard's Circle K.

About Valero Energy Corporation

What does Valero Energy own?
Valero Energy owns 15 petroleum refineries across the United States, Canada, and the United Kingdom, 14 ethanol plants in the United States, and a 50 percent stake in the Diamond Green Diesel renewable diesel joint venture. The company also operates approximately 7,000 retail and wholesale fuel outlets under the Valero, Diamond Shamrock, and Beacon brands.

Is Valero Energy publicly traded?
Yes. Valero Energy trades on the New York Stock Exchange under the ticker symbol VLO. The company is a component of the S&P 500 and is widely held by institutional investors, index funds, and individual shareholders. No parent company or controlling shareholder exists.

Who founded Valero Energy?
Valero was formed in 1980 as a subsidiary of Coastal States Gas Corporation to hold refining and marketing assets. The company was spun off as an independent entity in 1984. It was not founded by an individual but was created as a corporate entity through asset transfers and an IPO.

Where is Valero Energy headquartered?
Valero Energy is headquartered in San Antonio, Texas, USA. The company has maintained its headquarters in San Antonio since its founding and operates its corporate, finance, and strategic planning functions from that location.

How many brands does Valero Energy own?
Valero owns four primary fuel and retail brands: Valero, Diamond Shamrock, Beacon, and Valero Renewables. The company's brand portfolio is focused on fuel marketing rather than consumer goods.

Who owns Valero Energy?
Valero Energy is a publicly traded corporation with no controlling shareholder. The company is owned by institutional investors, mutual funds, index funds, and individual shareholders who purchase shares on the New York Stock Exchange. As an S&P 500 component, a significant portion of Valero's shares are held by passive index funds.

What is Valero Energy's revenue?
For fiscal year 2025, Valero reported total revenue of approximately $128 billion and adjusted net income of $3.3 billion. In Q2 2026, the company reported revenue of $44.5 billion and net income of $3.7 billion, a record for any second quarter.

Has Valero made major acquisitions recently?
Valero's most recent major acquisitions were the Ultramar Diamond Shamrock deal in 2001 ($4 billion) and the Premcor acquisition in 2005 ($8.7 billion). In recent years, the company has focused on operational improvements and organic growth rather than large-scale M&A. The company is completing a $230 million FCC Unit optimization project at its St. Charles refinery in 2026.

  • Founded: 1980
  • Headquarters: San Antonio, Texas, USA
  • Company Type: Publicly Traded
  • Stock: NYSE: VLO
  • Revenue: approximately $128 billion (FY2025)
  • Employees: Approximately 10,000

Visit Valero Energy Corporation website

View full company profile for Valero Energy Corporation

Where Is Diamond Shamrock Made / Based?

  • Headquarters: San Antonio, Texas, USA
  • Manufacturing / Operations: United States

Diamond Shamrock Categories & Tags

Gas StationFuel RetailHeritage BrandTexasGasoline

Diamond Shamrock Sustainability & Ethics

Diamond Shamrock operates under Valero's corporate environmental framework as a fuel banner. Station-level fuel supply meets the same specifications as Valero-branded fuel.

Awards & Recognition

Diamond Shamrock's heritage significance includes being the namesake of Sunray's Shamrock refinery and the corporate parent of what became CST Brands and, ultimately, Circle K's US store operations, a notable lineage in convenience retail history.

Diamond Shamrock Recalls & Controversies

The brand carries no major modern controversy. Its historical footprint includes refinery-community environmental issues typical of mid-century petroleum operations, absorbed into the parent company's liability structure after acquisition.

Brands Owned by Valero Energy Corporation

BeaconEnergy Utilities

Beacon

Owned by Valero Energy Corporation

Value-priced gasoline brand owned by Valero Energy, used by independent retailers primarily in California and the western United States as a low-cost fuel option.

gas-stationfuel-retaildiscount-fuel
Valero RenewablesEnergy Utilities

Valero Renewables

Owned by Valero Energy Corporation

Renewable diesel and ethanol division of Valero Energy, anchored by the Diamond Green Diesel joint venture, the world's largest renewable diesel producer.

renewable-dieselethanolbiofuels
ValeroEnergy Utilities

Valero

Owned by Valero Energy Corporation

Fuel retail brand of Valero Energy operating approximately 4,500 branded gas stations across 35 US states plus international sites in the UK and Ireland.

gas-stationfuel-retailgasoline
View all brands owned by Valero Energy Corporation

Diamond Shamrock Ownership: Pros & Cons

Advantages

  • +Deep Texas heritage and recognition dating to 1967
  • +Supplied by the largest independent US refiner
  • +Maintains presence in markets where the Valero banner is less dominant
  • +Low brand-maintenance cost relative to building new marks

Considerations

  • -Secondary status means limited marketing investment
  • -Station count has declined through decades of conversions to Valero
  • -Brand identity varies by dealer operator

Frequently Asked Questions About Diamond Shamrock

Sources & Further Reading

  • [Valero Official Website](
  • [Valero Station Locator](
  • [Diamond Shamrock on Wikipedia](

Competitors to Diamond Shamrock

These competing brands operate in the same categories and provide similar products or services. Compare key attributes to understand market positioning and competitive landscape.

BrandParent CompanyCountryFoundedMarket PositionPrimary MarketGender Target
ValeroValeroSister Brand
Valero Energy
USA
1980
Mass marketUnited statesUnisex
ChevronChevron
Chevron
USA
1930
Mass marketUnited statesUnisex
BeaconBeaconSister Brand
Valero Energy
USA
1947
ValueUnited statesUnisex
7676
Phillips 66
USA
1932
Mass marketUnited statesAll Genders
ConocoConoco
Phillips 66
USA
1875
Mass marketUnited statesAll Genders
Costco GasolineCostco Gasoline
Costco
USA
1995
Mass marketUnited statesAll Genders

Learn More About Competitors

ValeroEnergy Utilities

Valero

Owned by Valero Energy Corporation

Fuel retail brand of Valero Energy operating approximately 4,500 branded gas stations across 35 US states plus international sites in the UK and Ireland.

gas-stationfuel-retailgasoline
ChevronEnergy Utilities

Chevron

Owned by Chevron Corporation

American fuel retail brand operating more than 7,000 gas stations across the United States, known for gasoline with Techron additive and ExtraMile convenience stores.

gas-stationfuel-retailtechron
BeaconEnergy Utilities

Beacon

Owned by Valero Energy Corporation

Value-priced gasoline brand owned by Valero Energy, used by independent retailers primarily in California and the western United States as a low-cost fuel option.

gas-stationfuel-retaildiscount-fuel
76Energy Utilities

76

Owned by Phillips 66

76 is a classic American fuel brand owned by Phillips 66, famous for its orange ball logo, fronting branded gas stations primarily in the western United States.

fuelgasolineclassic-brand
ConocoEnergy Utilities

Conoco

Owned by Phillips 66

Conoco is a historic American fuel brand owned by Phillips 66, fronting branded gas stations primarily in the western and midwestern United States.

fuelgasolinepetroleum
Costco GasolineAutomotive

Costco Gasoline

Owned by Costco Wholesale Corporation

Costco Gasoline is Costco Wholesale's member fuel business, operating 747 stations worldwide and generating roughly $27 billion in annual fuel sales.

gasolinefuel-retailgas-stations

Competitive Analysis

Market Positioning: Diamond Shamrock competes with 6 brands in the same categories, ranging from mass market to luxury positioning.

Geographic Distribution: Competitors are headquartered across multiple regions, indicating global competition in this market segment.

Brand Heritage: Competitor brands range from established heritage brands to newer market entrants, with founding years spanning several decades.

Independent Alternatives to Diamond Shamrock

Looking for brands with different ownership structures? These similar brands are not owned by Valero Energy Corporation, giving you alternative choices that support different corporate structures.

ChevronEnergy Utilities

Chevron

Owned by Chevron Corporation

American fuel retail brand operating more than 7,000 gas stations across the United States, known for gasoline with Techron additive and ExtraMile convenience stores.

gas-stationfuel-retailtechron
Publicly Traded

Chevron operates independently without a large parent corporation.

Phillips 66Energy Utilities

Phillips 66

Owned by Phillips 66

Phillips 66 is the flagship fuel marketing brand of the downstream energy company of the same name, fronting about 7,620 branded US outlets alongside Conoco and 76.

fuelgasolinepetroleum
Publicly Traded

Phillips 66 operates independently without a large parent corporation.

CMS EnergyEnergy Utilities

CMS Energy

Owned by CMS Energy

American energy company providing electricity and natural gas utility services to Michigan residents through Consumers Energy subsidiary.

energy-utilityelectricitynatural-gas
Publicly Traded

CMS Energy operates independently without a large parent corporation.

Adani Green EnergyEnergy Utilities

Adani Green Energy

Owned by Adani Group

Adani Green Energy Limited (AGEL) is India's largest renewable energy company by installed capacity, listed on the National Stock Exchange and BSE. It develops, builds, and operates solar and wind power plants across India.

renewable-energysolarwind
Privately Owned

Adani Green Energy is privately owned, unlike Diamond Shamrock which is under a publicly traded parent company.

Adani PowerEnergy Utilities

Adani Power

Owned by Adani Group

India's largest private thermal power producer, operating approximately 17,550 megawatts of installed capacity across eight states, listed on NSE and BSE.

power-generationenergythermal-power
Privately Owned

Adani Power is privately owned, unlike Diamond Shamrock which is under a publicly traded parent company.

CenexEnergy Utilities

Cenex

Owned by CHS Inc.

American fuel, lubricant, and convenience store brand owned by CHS Inc., the nation's largest farmer-owned cooperative, operating roughly 1,400 locations across 19 states.

fuelgas-stationsconvenience-stores
Privately Owned

Cenex is privately owned, unlike Diamond Shamrock which is under a publicly traded parent company.

Valero Energy Corporation Stock Information

Jobs at Valero Energy Corporation

Latest News About Diamond Shamrock

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Last reviewed: September 25, 2026 · Reviewed by Who Brands Editorial Team