Short answers, pulled from the story.
The record belongs to Crypto.com Arena in Los Angeles. On the 17th of November 2021, Anschutz Entertainment Group and Singapore-based Crypto.com agreed on a 700 million dollar deal over 20 years. The venue, formerly the Staples Center, became Crypto.com Arena on the 25th of December 2021.
The practice is most often traced to 1926, when William Wrigley, owner of the Chicago Cubs, named his team's ballpark Wrigley Field. Fenway Park in Boston may offer an earlier precedent, opening in 1912 under an owner who ran a realty company of the same name. The first purely commercial deal, in which a company with no ownership stake purchased naming rights, was ARCO Arena in Sacramento in 1985.
As of 2025-27 of the 30 NFL stadiums and 29 of the 30 NBA arenas have sold or are in the process of selling their naming rights to corporate sponsors. For MLB the figure is 22 of 30 stadiums. In 1994, only 7 percent of major American professional sports venues carried a corporate name.
San Francisco voters approved Proposition H in November 2004 to require the stadium to revert to the name Candlestick Park once the Monster Cable contract expired. The public had consistently refused to use corporate names attached to the stadium through multiple naming rights agreements, continuing to call it Candlestick Park throughout.
Naming rights extend to transit stations, broadcast programs, geographic features, and competitions. The FA Cup is officially the Emirates FA Cup, and France's top football division is known as Ligue 1 McDonald's since 2020. The Hallmark Hall of Fame has carried a sponsor name since 1951. Boston's MBTA State Street station was sponsored by Citizens Bank from 1997 to 2000, and Madrid Metro renamed a line and a station for Vodafone from 2013 to 2016.
The Olympic and Paralympic Games prohibit corporate-sponsored venue names and treat them as ambush marketing, assigning temporary generic names during competition. General Motors Place in Vancouver was referred to as Canada Hockey Place during the 2010 Winter Olympics. Beginning with the 2028 Summer Olympics in Los Angeles, the International Olympic Committee allowed sponsored names on venue exteriors, though not on the field of play, and the LA28 organizing committee will charge sponsors for that visibility.