Probably much less. The organization is very flat and for the first several years they offered only 3 salary options close to 100K (something like 80, 100, 120) since they were still offering equity. Last I heard this system is still in place. So let's just say the typical overhead is around 150K and multiply that by 1500 employees (NYTimes/Wikipedia, 2015) and that gives us around $225 million.
Yeah, at a headcount of 1,500 employees (wikipedia) plus perks, expenses, etc. it's about a year's worth of operating budget.
Considering they just raised about $500m in the last 12 months before this...they're either buying expansion at an insane rate, or they're not making any money and are trying to figure out how to float this many people.
Their careers page says they have 73 openings across 19 offices...places that include Abu Dhabi, Canberra, London, LA, NYC, Tokyo, D.C., Copenhagen, Helsinki, Oslo, Tel Aviv, Singapore, Sydney, Wellington...so they're no longer just a U.S. concern.
I agree with the other comments in this thread that Palantir isn't really sensibly called a startup, given its ability to scale and its current size. But isn't 1-2 years worth of salary a pretty typical funding round?