The closely followed index is trading up 0.2% on Wednesday, running its year-to-date gain to about 11% as traders have shrugged off the inability of President Donald Trump to pass any major pieces of legislation and have instead focused on earnings growth.
Apple on Tuesday beat analysts' expectations for fiscal-third-quarter profits and revenue, and issued strong guidance for its fourth quarter. It shares rallied to a record on Wednesday, rising 6% to as high as $159.65.
The market's gains this week came despite mostly disappointing economic data. Personal income, ISM manufacturing, and construction spending all missed the mark while personal spending and core PCE prices matched estimates.
Traders also shrugged off a lackluster auto sales report for the month July, which showed the Big Three automakers all missed sales estimates by a wide margin. And, ADP's private-payrolls report showed that employers added 178,000 jobs in July, fewer than forecast.