Ken Griffin's companies are making their biggest bet yet on entry-level talent, as Citadel interns kick off their program with an offsite in Palm Beach on Monday. They're among the more than 350 interns at the company and its sister firm, market maker Citadel Securities, and comprise the biggest global class to date. The companies, known for recruiting the sharpest quants and traders, accepted a miniscule 0.36% of applicants out of more than 115,900 applications, up 6.4% from last year's record.