Company Town

* Market trends: Microsoft Corp. was the volume leader in Monday’s trading. Shares of Silicon Graphics Inc. rose $1.13 to $44.38, spurred by the introduction of a new line of more powerful workstations. The Indigo2 Impact machines are expected to bring in more than $1 billion a year in revenue for the Mountain View, Calif.-based computer systems company by the end of the fiscal year in June, 1996.