The parent of the fast-growing social network Snapchat filed public documents for a share offering Thursday, seeking to raise up to $3 billion.

California-based Snap Inc., which had earlier filed confidential documents for an initial public offering, was expected to be one of the biggest tech company market debuts in recent years with a valuation likely to top $20 billion.

In documents filed with the Securities and Exchange Commission, Snap said it took in $404 million in revenue last year but lost $515 million.