Question: Are Phillips 66 and Cimarex Energy both American companies?

Context articles: Jimmy McNatt
Cedar Bayou plant
Cimarex Energy
Chevron Phillips Chemical
ConocoPhillips
Frank Phillips (oil industrialist)
Phillips 66ers
Gerald Tucker
Phillips 66
Wood River Refinery

James Carlos "Jimmy" McNatt (December 19, 1918 – December 23, 2000) was an All-American basketball player for the Oklahoma Sooners and the AAU’s Phillips 66ers.
 At Oklahoma, McNatt led his team to the first-ever NCAA Final Four in 1939, and at Phillips 66, McNatt guided the 66ers (also called the "Oilers") to four consecutive AAU national championships (1943, 1944, 1945, and 1946).
 He was a two-time All-American at Oklahoma (1939, 1940) and a four-time AAU All-American for Phillips 66 (1943, 1944, 1945, 1946).
 The speedy player came to be known by his nickname “Scat” McNatt, a moniker originally traced back to the term “Boy Scats” which sportswriters had used to describe McNatt’s fast-breaking, sophomore-led 1937-38 Oklahoma Sooners basketball team.
 McNatt grew up in Norman, Oklahoma, attended Norman High School, and then opted to stay in his hometown to play basketball for the University of Oklahoma.
Cedar Bayou plant is a petrochemical manufacturing facility located in Baytown, Texas.
 It is the largest U.S. manufacturing facility of Chevron Phillips Chemical Company.
 The plant operates seven process units on approximately 1,400 acres producing Ethylene, Propylene, Normal Alpha Olefins (NAO), High Density Polyethylene (HDPE), Low Density Polyethylene (LDPE), Linear Low Density Polyethylene (LLDPE), and Polyalphaolefins.
 Cedar Bayou plant opened in 1963 as Gulf Oil and was sold to Chevron Corp. in 1985.
 In 2000, Chevron Corp. and Phillips 66 merged their chemical businesses to form Chevron Phillips Chemical Company.
Cimarex Energy Co. is an American petroleum and natural gas exploration and production company headquartered in Denver, Colorado, with operations primarily in Texas, Oklahoma, and New Mexico.
Chevron Phillips Chemical is a petrochemical company jointly owned by Chevron Corporation and Phillips 66.
 The company was formed July 1, 2000 by merging the chemicals operations of both Chevron Corporation and Phillips Petroleum Company.
 As equally-owned company, it is governed by a board of directors composed of two members from each of the parent companies.
 The company was actually named in a coin toss to determine which parent company name would be first and which would be last.
ConocoPhillips Co. is an American multinational energy corporation with its headquarters located in the Energy Corridor district of Houston, Texas in the United States.
 It is the world's largest independent pure-play exploration and production company and is a Fortune 500 company.
 ConocoPhillips was created through the merger of American oil companies Conoco Inc. and Phillips Petroleum Co. on August 30, 2002.
 In 2012, ConocoPhillips spun off its downstream assets as a new, and separate company, Phillips 66.
Frank Phillips (November 28, 1873 – August 23, 1950) founded Phillips Petroleum in Bartlesville, Oklahoma (marketed as Phillips 66) in 1917, along with his brother, Lee Eldas "L.E." Phillips, Sr.
 In 2002, Phillips Petroleum merged with Conoco Oil Company and became ConocoPhillips.
The Phillips 66ers (also known as the Oilers) was an amateur basketball team located in Bartlesville, Oklahoma, and sponsored and run by the Phillips Petroleum Company.
 The 66ers were a national phenomenon that grew from a small-town team to an organization of accomplished amateur athletes receiving national and worldwide attention.
 Under the sponsorship of the company's owner, Frank Phillips, the team, which began playing in 1919, participated in the Amateur Athletic Union, the nation’s premier basketball league before the National Basketball Association.
 Between 1920 and 1950, some of the strongest basketball teams in the United States were sponsored by corporations—Phillips 66, 20th Century Fox, Safeway Inc., Caterpillar Inc., and others.
Gerald Tucker (March 14, 1922 – May 29, 1979) was the head coach on the 1956 USA Men's Basketball Gold Medal Olympic Team.
 He was the coach of Bartlesville Phillips 66ers for four seasons from 1954-58 having the most wins in the National Industrial Basketball League in each of those 4 seasons.
 In 1955 Bartlesville Phillips 66ers won the AAU National Basketball Championship against the Luckett-Nix Clippers of Boulder, Colorado, winning 66-64 and in 1956 they were the runners-up to the Buchan Bakers of Seattle, losing 59-57.
The Phillips 66 Company () is an American multinational energy company headquartered in Westchase, Houston, Texas.
 It debuted as an independent energy company when ConocoPhillips executed a spin-off of its downstream and midstream assets.
 Taking its name from the 1927 "Phillips 66" trademark of ConocoPhillips predecessor Phillips Petroleum Company, Phillips 66 began trading on the New York Stock Exchange on May 1, 2012, under the ticker PSX.
 The company is engaged in producing natural gas liquids (NGL) and petrochemicals.
 The company has approximately 14,000 employees worldwide and is active in more than 65 countries.
 Phillips 66 is ranked No. 30 on the Fortune 500 list and No. 74 on the Fortune Global 500 list as of 2016 .
The Wood River Refinery is an oil refinery located in Roxana, Illinois, approximately 15 mi north of St. Louis, Missouri, on the east side of the Mississippi River.
 The refinery is currently owned by Phillips 66 and Cenovus Energy, and operated by the joint-venture company WRB Refining, LLC (WRB).
 WRB was formed on 1 July 2007, with Encana taking a 49% interest in Wood River and also Phillips 66's Borger refinery.
 Encana subsequently spun off oil sands producer Cenovus and ConocoPhillips spun off Phillips 66.
 In return for a 49% stake in the refinery, ConocoPhillips gained a joint interest in two Alberta oil sands (bitumen) heavy oil projects: Christina Lake (Alberta) and Foster Creek.
 ConocoPhillips’ interest was sold to Cenovus in May 2017, leaving Cenovus the sole owner and operator of the assets.
 Cenovus uses SAGD (steam-assisted gravity drainage) technology at those sites.