Mitsubishi Tokyo Financial Group Inc. and UFJ Holdings Inc. said Friday that Mitsubishi Securities Co. and UFJ Tsubasa Securities Co. have tied up in investment banking and other areas prior to their planned merger next October.

The securities business units of the two banking groups will tie up in other areas where cooperation is possible, they said.

The latest tieup covers the underwriting of new stock and bond issues, and the reciprocal exploitation of knowledge for transactions in stocks, bonds and financial derivatives, they said.