NEW YORK, June 5 : - SpaceX has drawn investor demand that is about double the $75 billion it is seeking to raise next week in its IPO, or $150 billion, said two people familiar with the matter on Friday. An oversubscription rate of two times would be considered modest for most highly anticipated market flotations, but bankers and investors said that demand is impressive for the SpaceX offering since it is the largest IPO ever. The company remains in the early stages of the marketing process,