Telco, Walmart, any company that would rather have a big brand with name association on the hot seat instead of them.

Also possible he was saying that people will vote in favor of keeping these companies together and not bringing anti-trust issues to court because lobbyists push hard to feed a "capitalism shouldn't be touched by the government" view which is against the consumers best interests. That would drive them to vote against Warren and her politics.

Also, do you expect people to name names of lobbyists? I think it's pretty safe to assume there are groups who feel that the FAANG companies are too powerful and need to go the way of Bell labs. And many people (wrongly? rightly?) label anything they feel is politically motivated speech as "propaganda".