The news articles by Bloomberg and CNN News confirm that his campaign advisors had said so about his business but not about its proceeds.
The CNN news article reported that Bloomberg's campaign adviser told CNN that Bloomberg would sell his financial information and media company if he were to be elected as the president.
Bloomberg discussed the objectives of possible 2020 presidential bid in the Radio Iowa press meet on 4 December 2018. In that meet, he had said that he would either place his company in a blind trust or sell it if he was elected as the U.S.Preseident.
However, Bloomberg and his representatives have not said anything about the proceeds of such a sale.