Musk's original plan was to acquire Twitter with a combination of $21 billion in personal equity and $25.5 billion in loans and $12.5 billion of those loans were secured against Tesla shares owned by Musk. According to the new SEC filing, "(Elon Musk has) committed to a increase the aggregate principal amount of the equity commitment there under to $33.5 billion." However, it is not clear where the additional $6.25 billion will come from.