Do you mean taking a company public without any co-founders and employees, or starting originally with none, then later taking some on?
If the latter, I would think Dropbox would count, since at least originally it was a single founder.
I mean IPO’d with one employee - the founder
I suspect IPO would be impossible with one 'person'. You'd have other people on payroll: Lawyers and accountants at the very least. If you're paying millions of dollars to professionals anyway at a certain point it would more sense to hire the people directly, right?
Maybe not. Conceivably, everyone could be on payroll as contractors except the founder.