April 11 (Reuters) - Investment bank Morgan Stanley's ( MS )

wealth management arm is being probed by multiple

regulators, the Wall Street Journal reported on Thursday citing

people familiar with the matter.

The U.S. Securities and Exchange Commission, the Office of

the Comptroller of the Currency (OCC) and other Treasury

Department offices are involved, the report said. Shares of the

bank fell 4.4% to $87.71.

Morgan Stanley's ( MS ) wealth management unit caters to high

net-worth individuals and small to medium-sized businesses,

providing them with brokerage, custody, investment advisory and

financial planning services.

The business is more insulated from seismic shifts in the

market compared to investment banking and has been a crucial

factor in determining the premium valuation Morgan Stanley ( MS )

commands relative to rival Goldman Sachs ( GS ).

The main issues under the scanner were whether the bank has

been sufficiently investigating the identities of prospective

clients and where their wealth comes from, and how it monitors

their financial activity, the report said.

Some of the probes are also focusing on international

clients, the report added.

Morgan Stanley ( MS ) had only recently resolved a years-long

investigation into its block trading practices.

Spokespeople for Morgan Stanley ( MS ), the SEC, the OCC and the

Treasury did not immediately respond to Reuters' requests for

comment.