Pulte Homes (PH ) agreed to buy Del Webb (WBB ) for $40.51 per share, subject to adjustments.

Marshall & Ilsley (MI ) will buy National City Bancorp (NCBM ) on the basis of 0.58462 Marshall share per National City share.

All shares of STV Group (STVI ) not owned by STV Inc. are to be exchanged for $11.25 cash per share.

Chemical Financial (CHFC ) will buy Bank West (BWFC ) for $11.50 per share.

On Assignment (ASGN ) hired Lehman Bros. to assist it in evaluating options.

Carl Icahn will proceed with due diligence efforts in regard to VISX Inc. (EYE ); Icahn says VISX is showing "sincere" interest in a sale at $32 per share cash.

BFMA Holding Corp. offered to buy the remaining shares of Mortons Restaurant Group (MRG ) for $28.25 per share cash.

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