E-signature company DocuSign is reportedly preparing an initial public offering (IPO) in the next six months.

San Francisco-based DocuSign, which has led the way in digital transactions with electronic signatures, has submitted a confidential IPO filing with the Securities and Exchange Commission (SEC), and will reveal the details of it in the weeks before it goes public, according to a report from TechCrunch. Investors have been anticipating such a move for several years.

Value Up 72% From 3 Years Ago

The confidential IPO filing allows DocuSign to submit its finances, including balance sheets and income statements, to the SEC before it reveals them to the public. The company is reportedly aiming for a mid-May launch date, although DocuSign did not officially comment.

Since it was founded in 2003, DocuSign has raised about $500 million in funding, including from the likes of Kleiner Perkins, Bain Capital, Intel Capital, Dell and Google Ventures. Now, it’s valued at about $3 billion. According to a Wall Street Journal analysis, about 169 private companies have a valuation of more than $1 billion, up 72% from three years ago.

An IPO by DocuSign would follow DropBox Inc.’s highly anticipated IPO, which aims to raise about $648 billion and values the company at about $8 billion. Like DocuSign, DropBox also filed a confidential IPO in a strategy that is on the increase after the SEC last year lifted its restriction on confidential IPOs from just small companies to all companies. (See also: Dropbox IPO Pegs Valuation at $8 Billion.)

DocuSign, which competes with signature platforms like Adobe’s (ADBE) Adobe Sign and HelloSign, focuses on industries like financial services, real estate, insurance and healthcare. It’s drawn business from major corporations like Morgan Stanley (MS), Bank of America (BAC), T-Mobile (TMUS), and SalesForce (CRM).