The Dow Jones Industrial Average closed 0.05% lower to 17,663.2 points, while the Nasdaq closed 0.4% lower, to 5,053.8 points.
Chevron was one of the biggest winners, up 1.11% to over $90 a share.
AB InBev was up 1.4% to over $119 a share after operating profit jumped.
The brewer also gave encouraging guidance on revenue, ahead of its $105bn (Â£70bn) agreed merger with rival SABMiller.
The S&P 500 index closed lower 0.48%  to 2,079.36 points.
Shares in Exxon Mobil closed up 0.74% to $82, after reporting results which were slightly better than expectations.
Shares in troubled Canadian pharmaceutical company Valeant closed almost 16% lower,  as action continues over allegations from investor and researcher Citron over Valeant's involvement with "phantom pharmacies".
(Close): US stocks closed lower on Friday, despite better-than-expected results from Chevron and AB InBev, ending Wall Street's best month in four years.