The Wealth Bulletin gives an inventory of some bank art collections:

• Deutsche Bank, which last week reported its first annual loss since the Second World War, has one of the largest corporate art collections in the world, owning 53,000 works. The collection was last publicly valued at more than £75m in 2004.
• UBS has a collection of 45,000 works worth at least $150m (€117m) with big name artists such as Lucian Freud, Roy Lichtenstein, Candida Hofer, Edward Ruscha and Julian Schnabel hanging on its walls in Zurich, London and New York.
• JP Morgan is in better shape and sold a large part of its art collection between 2004 and 2006, although it still retains 35,000 works.

Banks’ Latest Write-down Woe–Their Art (Wealth Bulletin)