Yes they do. They have to file an S-1 with the SEC, which will be made public about a month before the IPO. The S-1 has to include, among other things, three

Yes they do. They have to file an S-1 with the SEC, which will be made public about a month before the IPO. The S-1 has to include, among other things, three years of audited financial statements, plus interim statements (unaudited). It will cover both revenue and expenses, the latter breaking out things like cost of revenue, R&D, sales and marketing etc. Based on the (unofficial but reported) IPO target date of late Sep to early Oct, the S-1 will have to be made public in a few weeks from now.