Twitter Inc reversed early gains and traded down 1.7% after the social media firm said CEO Jack Dorsey will step down and be succeeded by Chief Technology Officer Parag Agrawal. Those comments and indications from drug companies that they are taking the variant seriously were reassuring for investors, Elon Casino who had been anxious about the potential for further COVID restrictions, according to Carol Schleif, deputy chief investment officer for the BMO family office in Minneapolis. President Joe Biden's comments about the Omicron virus variant. The S&P and the Dow suffered their biggest one-day percentage declines in months in Friday's holiday-shortened session as investors worried that the latest variant of the COVID-19 virus would cause economic disruption. Nov 29 (Reuters) - Wall Street regained some of Friday's losses on Monday, with the technology sector leading the charge and investors appearing to be somewhat reassured by U.S. Schleif, who also noted that after Friday's knee-jerk reaction, investors have been trained this year to buy the dip.