1.   Colonial Properties Trust is in talks to buy closely held Atlanta office developer Johnson Development Co., a Colonial spokesman said.

2.   Imation Corp. said it agreed to buy closely held Luminous Corp., a maker of graphic art and publishing software, for an undisclosed amount of cash and stock.

3.   Summit National Bank of Atlanta announced Friday it agreed to buy privately held California Security Bank of San Jose for cash.

4.   The company said it agreed to buy privately held Elmo Semiconductor Corp., a Burbank, California-based provider of unpackaged semiconductors and related products.

5.   The company said Monday that it agreed to buy closely held Elmo Semiconductor Corp., a Burbank, California-based provider of unpackaged semiconductors and related products.