Also on Thursday, Warriors Coach Steve Kerr said he would “personally apologize to Kyle and the Raptors,” and he called Stevens’s behavior “unacceptable,” echoing a message from the league.

“A team representative must be held to the highest possible standard, and the conduct of Golden State Warriors investor Mark Stevens last night was beyond unacceptable and has no place in our league,” Mike Bass, the N.B.A.’s executive vice president for communications, said in a statement Thursday before Stevens’ ultimate penalties were announced.

Stevens issued a statement on Thursday that said: “I take full responsibility for my actions last night at the NBA Finals and am embarrassed by what transpired. What I did was wrong and there is no excuse for it. Mr. Lowry deserves better, and I have reached out today in an attempt to directly apologize to him and other members of the Raptors and Warriors organizations. I’m grateful to those who accepted my calls.”

Stevens also said in the statement that he accepted his punishment, which was one of the harshest levied by N.B.A. Commissioner Adam Silver in his five-year tenure.

In his first year as commissioner, Silver issued a lifetime ban and a $2.5 million fine to Donald Sterling, then the owner of the Los Angeles Clippers, after Sterling was recorded making racist comments. Sterling was forced to sell the team.

In September, shortly before the start of this season, a seven-month investigation into allegations of sexual harassment and other improper workplace conduct against the Dallas Mavericks led to a pledge by Mark Cuban, the team owner, to donate $10 million to women’s organizations.

Several players have been fined through the years for negative interactions with fans, such as cursing or yelling in response to taunts. Several fans have been banned for racist remarks and other inappropriate behavior toward players.