Elon Musk announced plans on Wednesday for one of the biggest stock sales ever by taking public a space company that is currently losing billions of dollars a year.

A filing shows that his SpaceX lost $2.6 billion from operations last year on $18.7 billion in revenue, and the losses kept piling up at the start of this year, too.

The prospectus did not put a dollar figure on the amount Musk hopes to raise, but various reports have put it at $75 billion or so. An offering of that size would easily surpass the current title holder, Saudi Aramco, the oil giant that went public seven years ago and raised $26 billion.