The Dow Jones Industrial Average ( ^DJI) climbed 0.6%, or over 200 points, while the S&P 500 ( ^GSPC) added 0.3% on the heels of an all-time closing high. The tech-heavy Nasdaq Composite ( ^IXIC) gained around 0.5%.

The well-received results from Salesforce.com are having an outsized impact on the Dow -- the software maker's current premarket price equates to a 273-point boost to the blue-chip index, which remember is price-weighted.

U.S. stock indexes are rising toward more records Wednesday after tech companies talked up how much artificial intelligence is boosting their results. The S&P 500 rose 0.3% in morning trading to add to what looks to be one of its best years of the millennium.

Stock futures are pointing to a flat open on Tuesday as the market looks to extend a rally that has pushed major indexes to record levels.

Still, the Dow was down slightly, dipping 0.1% as most stocks in the blue-chip equities index traded lower. This year is ending with "a little bit of uncertainty" about the economic outlook, and the U.