Google Shares Hit Another High Note

Updated from 2:10 p.m. EDT

Google's (GOOG Quote) volatile stock hit new highs Monday amid optimism about online advertising and the countdown to widespread research coverage on Wall Street.

Shares in Google, which went public in late August at $85 a share, closed at $119.36 in the regular session Monday, up $1.87, or 1.59%. Earlier in the day, shares hit $121.60 for a short-lived 3.5% gain for the day.

While analysts cite a variety of reasons for Google's rise -- it's up more than 41% from its initial public offering price and more than 17% since Sept. 9 -- the stock's bubble-era-volatility is clearly a factor. ...