The blue-chip Dow Jones held on to slim gains to close at a third consecutive record on Friday.
But the broader S&P 500 and the tech-based Nasdaq closed lower, ending a busy week of earnings results.
The Dow added 0.2% to 21,830.31, while the S&P and Nasdaq were both down 0.1% to close at 2,472.09 and 6,374.68.
Shares in online retail giant Amazon fell 2.56% after it surprised investors by reporting lower-than-expected profits.
Profits for the April-to-June period fell 77% to $197m as the company invested in overseas expansion and new products and services.
Shares in Goodyear sank more than 8% after the tyre maker's second-quarter sales fell short of expectations and the company cut its forecasts.
Goodyear now expects sales at its tyre unit to fall by about 3.5% this year, compared with its previous forecast of no change.