A cluster of companies led by artificial-intelligence chipmaker Cerebras Systems Inc. started formally marketing their US IPOs Monday, as firms weighing second-quarter debuts look to get ahead of SpaceX’s potentially record-breaking listing.

Initial public offerings by firms ranging from Blackstone Inc.’s data-center acquisition vehicle to KKR & Co.-backed emergency medical services provider GMR Solutions Inc. could raise as much as $7.7 billion, adding to an expected $1.03 billion of listings already being pitched to investors.