I can imagine that Cryptsy wallet for CENTs has a large part of them...
Just the top 200 sell orders for LTC plus the top 200 sell orders for XPM have the nice value of: 2.060.234.387.087 (little over 2 US trillions)
I can imagine that there are quite a few more orders, that there are coins which are not in orders and finally their own balance of coins created from stakes.
Cryptsy must really love CENT!!
to quote Big Vern on asked on the CENT probem " I'm just thinking if chucking them all at any wallet"