Because there are a gaggle of available ones as of yesterday. Up front, the catch is that you'll have to work at UBS but it's a small price to pay when you factor in the second to none tax advice you'll be getting on the house. Apparently the Swiss bank's global head of healthcare, Benjamin Lorello, was recently hired by Jefferies and somehow convinced most if not all of his team's senior bankers to come with. Supposedly the junior bankers on the 36th floor of 299 Park were unaware they were being abandoned until yesterday, when none of their superiors showed up. So, that's sad, in a three-legged dog with cancer way, but on the bright side, what with the absence of Lorello (he of "asses at desks by 9AM or I'll make you wish you were never born" fame), everyone will be able to take the summer a little easier, and mosey on in whenever they want (assuming there aren't any more cuts planned for the near future).
Related: Your Tardy Ass Will Not Be Tolerated At UBS--Fraud, Money Losing Begin Promptly At Nine A.M.