Top Biden administration officials had previously undisclosed ties to large corporations including tech giants Microsoft Corp, Alphabet's Google and Facebook Inc, financial disclosures by the White House show. According to the filings with the Office of Government Ethics, National Security Advisor Jake Sullivan served on an advisory council for Microsoft from 2017 through May of last year. He was paid $45,000 last year, according to his disclosure, a copy of which was seen by Reuters. Sullivan, who oversees an interagency response to January's cyberattack on Microsoft's Exchange email software, holds between $50,000 and $100,000 of stock in both Microsoft and Alphabet and owns between $15,000 and $50,000 of Facebook stock, the disclosure shows.