Zulily, The Flash Sale Site For Moms, Filed A 'Secret' IPO

Zulily, the flash sale site for moms, had $272 million in revenues in the first half of 2013 and is unprofitable, according to the S-1 disclosure it just filed with the SEC ahead of its IPO.

Its revenue is growing, however: Zulily saw $127 million in sales in the first half of 2012.

The company has 2.2 million active customers, with revenue per customer of $214. It stages 4,000 flash sales per day, according to the S-1.

The company, founded in 2009, has been valued at $1 billion and has received $139 million in venture capital funding.

Its IPO was initially filed confidentially with the SEC, a so-called "secret" IPO, for companies that have less than $1 billion in revenues.