The three major US equity indices - Dow Jones Industrial Average, S&P 500, and Nasdaq Composite - hit all-time highs on Tuesday morning, reinforcing their recent uptrend after brutal plunges in September and sheer volatility earlier this month.
Equity analysts said strong earnings from Big Tech companies are expected to bolster the market further by Wednesday's close.
"In all likelihood, it will be the Q3 results from Apple, Alphabet, and Twitter that will drive directional volatility on Wall Street", Jeffrey Halley, head of research for Asia at the online trading platform OANDA, said.
The Dow, a blue-chip index which groups mostly industrial stocks, was up 0.3% to 35,839 by 10:00 a.m. ET (14:00 GMT) after a record high of 35,791 earlier.
The S&P 500, which consists of the top 500 US stocks, was up 0.5% to 4,587. It earlier hit an all-time high of 4,581.