Facebook will acquire message and phone company WhatsApp for $19 billion dollars, according to an SEC filing made today. The price will be broken down into roughly $12 billion in Facebook stock, $3 billion in restricted stock and an extra $4 billion in cash.

This is the largest acquisition the social media company has made to date, nearly 19 times as much as what the company paid for Instagram in April of 2012.

This story is developing and will be updated with more information as it happens.