(For a live blog on the U.S. stock market, click or type LIVE/ in a news window)
* Futures up: Dow 0.13%, S&P 0.02%, Nasdaq 0.04%
By Sruthi Shankar
April 24 (Reuters) - U.S. stock index futures were largely unchanged on Wednesday after the S&P 500 and the Nasdaq closed at record highs in the previous session, with investors awaiting earnings from bellwethers Boeing and Caterpillar.
Boeing Co shares were flat in premarket trading as investors awaited details on the impact of the 737 MAX jet groundings on the planemaker's earnings. The high-flying stock has lost 11.5% since the deadly Ethiopian crash in early March.
Caterpillar Inc, a proxy for global economic activity, edged up 0.1% ahead of its results.
Microsoft Corp and Facebook Inc are set to report after the closing bell on Wednesday.
Wall Street's main indexes are holding within a hair's breadth of all-time highs after a rally this year, sparked by a dovish Federal Reserve, hopes of a U.S.-China trade resolution and an upbeat earnings season.
About a third of the S&P 500 companies are expected to report this week, making it the busiest period of the first-quarter earnings season.
The results could determine if investors should be concerned about the start of an earnings recession or whether back-to-back quarters of negative growth can be avoided.
Profits of S&P 500 companies are expected to decline 1.3% for the quarter, according to Refinitv data. However, about 78%of the 104 companies that reported through Tuesday surpassed earnings estimates.
At 6:30 a.m. ET, Dow e-minis were up 35 points, or 0.13%. S&P 500 e-minis were up 0.5 points, or 0.02% and Nasdaq 100 e-minis were up 2.75 points, or 0.04%.
Among other stocks, Snap Inc climbed 6.3% after original shows and a redesigned Android app helped the company add Snapchat users for the first time in three quarters and top analysts' revenue forecasts.
EBay Inc shares jumped 4.4% after the company raised its full-year sales and profit forecasts. (Reporting by Sruthi Shankar in Bengaluru; Editing by Anil D'Silva)