The Presidential Inaugural Committee has raised at least $90 million -- a record -- to pay for the festivities and provide big donors some face time with the new administration.
SoftBank holds stakes in both companies and its chief, billionaire businessman Masayoshi Son, earlier in December said he would invest $50 billion in the U.S. and create 50,000 jobs.
IBM Chief Executive Ginni Rometty is one of more than a dozen U.S. executives serving on an advisory council that Trump has formed to consult him on job creation.
Tillerson's experience in diplomacy stems from making deals with foreign countries for Exxon, although questions have been raised about his relations with Russia.
Leaders from Alphabet, Apple and Facebook are among a small group of tech leaders invited to the summit that will take place at Trump Tower in New York City.
It was expected to touch nearly every sector of the U.S. economy and have the greatest impact on nonprofit groups, retail companies, hotels and restaurants.