Elon Musk announced plans 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.

SpaceX, formally known as Space Exploration Technologies Corp., has said the money will help finance projects to put people on the moon and Mars in its quest to make humans an intergalactic species as they face existential threats that could wipe out civilization.

“We do not want humans to have the same fate as dinosaurs,” the filing states.