BUZZ — Microsoft becomes $4 trillion company once again a year later

* Microsoft shares rise 1% to $540.50, market valuation exceeds $4 tln the first time in ~1 year * MSFT Monday announces next-gen Maia 300 custom AI chip, designed to handle AI data-crunching such as coding and carrying out complex business tasks on a user's behalf * Says new chips will get ~40% more useful computing done per MW than "leading GPU-based systems," though it did not name the systems it used for a comparison * Plans to roll out "multi-gigawatt deployments" of Maia 300 next year * Including session's move, MSFT rises 11.6% YTD vs a 14% gain in the S&P 500 index * Stock fell as much as 27% earlier this year amid broader weakness (Reporting by Anand Gopal in Bengaluru) ((AnandGopal.R@thomsonreuters.com)