BRUSSELS, March 24 : EU antitrust chief Teresa Ribera, who has voiced concerns about Big Tech extending its dominance into artificial intelligence, will meet the CEOs of Alphabet, Meta Platforms and OpenAI on Tuesday, a European Commission agenda item shows. The first-time meetings with Sundar Pichai, Mark Zuckerberg, and Sam Altman in San Francisco will take place as part of Ribera's week-long trip to the United States where she is scheduled to speak at an American Bar Association conference