https://www.reuters.com/article/us-slack-listing/slack-registers-117-million-shares-for-direct-listing-idUSKCN1SQ2E6

Slack Technologies Inc, the owner of the workplace instant messaging app, said https://www.sec.gov/Archives/edgar/data/1764925/000162828019007058/slacks-1a2.htm on Monday it had registered about 117 million of its Class A shares, which is an estimate for the number of shares that will be needed when the stock begins to trade.