Reddit app is seen on a smartphone in this illustration taken, July 13, 2021. REUTERS/Dado Ruvic/Illustration/File PhotoSocial media platform Reddit Inc, whose message boards became the center of the stock trading frenzy in 2021, relies on Wall Street banks Morgan Stanley (MS.N) and Goldman Sachs Group (GS. N) for its initial public offering, a source familiar with the matter told Reuters on Friday. Reddit had confidentially filed for an IPO in December and is aiming for a valuation of more than $15 billion at the time of its listing.