Question: Who sponsored the 2011 Big 12 Men's Basketball Tournament and is headquartered in Westchase, Houston, Texas?

Context articles: Big 12 Men's Basketball Tournament
Phillips 66
2015–16 Big 12 Conference men's basketball season
2009–10 Texas Longhorns men's basketball team
2016–17 Big 12 Conference men's basketball season
2010–11 Texas Longhorns men's basketball team
2011 Big 12 Conference Baseball Tournament
2011 Big 12 Men's Basketball Tournament
2010–11 Missouri Tigers men's basketball team
2010–11 Kansas Jayhawks men's basketball team

The Big 12 Men's Basketball Tournament (known since its inception in 1997 under sponsorship agreements as the Phillips 66 Big 12 Men's Basketball Tournament) is the championship men's basketball tournament in the Big 12 Conference.
 It is a single-elimination tournament of four rounds, with the top four seeds getting byes in the first round.
 Starting in 2012, the top six seeds will get byes in the first round.
 Seeding is based on regular season records.
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 2015–16 Big 12 men's basketball season was the 20th season of basketball for the Big 12 Conference.
 Team practices began in October 2015, followed by the start of the regular season on November 13.
 Conference play began on January 2, 2016, and concluded on March 5.
 Kansas won their 12th straight Big 12 regular season championship by finishing 33–5 overall and 15–3 in conference play, two games ahead of second-place West Virginia.
 The 2016 Big 12 Men's Basketball Tournament took place from March 9–12, 2016 at the Sprint Center in Kansas City.
 Kansas won the tournament for the 10th time in school history.
The 2009–10 Texas Longhorns men's basketball team represented the University of Texas in the 2009-10 NCAA Division I men's basketball season.
 Their head coach was Rick Barnes, who was in his 12th year.
 The team played its home games at the Frank Erwin Center in Austin, Texas and are members of the Big 12 Conference.
 The Longhorns finished the season 24–10, 9–7 in Big 12 play and lost in the first round of the 2010 Big 12 Men's Basketball Tournament.
 They received and at–large bid to the 2010 NCAA Men's Division I Basketball Tournament, earning an 8 seed in the East Region.
 They were defeated in the first round by 9 seed Wake Forest in overtime.
The 2016–17 Big 12 men's basketball season is the ongoing 21st season of basketball for the Big 12 Conference.
 Team practices began in October 2016, and were followed by the start of the regular season on November 11.
 Conference play began on December 30, 2016 and will conclude with the 2017 Big 12 Men's Basketball Tournament, beginning March 8, 2017 at the Sprint Center in Kansas City.
 During the conference's non-conference schedule, Big 12 teams posted a win percentage of .822, the best non-conference win percentage of any conference in the nation.
The 2010–11 Texas Longhorns men's basketball team represented the University of Texas in the 2010–11 NCAA Division I men's basketball season.
 Their head coach was Rick Barnes, who was in his 13th year.
 The team played its home games at the Frank Erwin Center in Austin, Texas and are members of the Big 12 Conference.
 They finished the season 28–8, 13–3 in Big 12 play and lost in the championship game of the 2011 Big 12 Men's Basketball Tournament to Kansas.
 They received an at-large bid in the 2011 NCAA Men's Division I Basketball Tournament where they defeated Oakland in the second round before falling in the third round to Arizona.
The 2011 Big 12 Conference Baseball Tournament was held at RedHawks Ballpark in Oklahoma City, OK from May 25th to May 29th, 2011.
 After five years using the round robin tournament setup, the 2011 Big XII Tournament switched back to the format used from 1999 to 2005, which consisted of two separate four-team double-elimination tournaments.
 The winners of each of those tournaments faced each other in a one-game match for the championship.
 Missouri and Texas A&M faced each other in the championship game on Sunday, May 29, 2011.
 Texas A&M beat Missouri 10-9 in 10 innings to win the 2011 Big XII Tournament.
 As the conference tournament champion Texas A&M earned an automatic bid to the 2011 NCAA Division I Baseball Tournament.
 This was the second consecutive year that Texas A&M won the conference tournament in extra innings on a walk-off home run.
The 2011 Phillips 66 Big 12 Men's Basketball Championship was the 2011 edition of the Big 12 Conference's championship tournament held at the Sprint Center in Kansas City, Missouri from March 9 until March 12, 2011.
 It was won by top-seeded Kansas.
The 2010–11 Missouri Tigers men's basketball team represented the University of Missouri in the 2010-11 NCAA Division I men's basketball season.
 Their Head Coach was Mike Anderson, who was in his 5th year at Missouri.
 The team played its home games at Mizzou Arena in Columbia, Missouri and they are members of the Big 12 Conference.
 They finished the season 23–11, 8–8 in Big 12 play and lost in the quarterfinals of the 2011 Big 12 Men's Basketball Tournament to Texas A&M.
 They received an at-large bid in the 2011 NCAA Men's Division I Basketball Tournament where they lost in the second round to Cincinnati.
The 2010–11 Kansas Jayhawks men's basketball team represented the University of Kansas in the 2010–11 NCAA Division I men's basketball season, which was the Jayhawks' 113th basketball season.
 The head coach was Bill Self, who was serving his 8th year.
 The team played its home games in Allen Fieldhouse in Lawrence, Kansas and are members of the Big 12 Conference.
 They finished the season 35–3, 14–2 in Big 12 play to claim the regular season conference title.
 They were also champions of the 2011 Big 12 Men's Basketball Tournament.
 They earned a #1 seed in the Southwest Region in the 2011 NCAA Men's Division I Basketball Tournament where they defeated Boston University in the second round and Illinois in the third round to advance to the "Sweet Sixteen".
 They defeated Richmond to advance to the "Elite Eight" where they were upset by Virginia Commonwealth.