The Dow, S&P 500, and Nasdaq fell Friday as the stock market grappled with AI concerns and fears over U.S. talks with Iran.

Dow falls more than 500 points; Paramount wins bidding war for Warner Discovery

Stock Market Today: The Nasdaq ends a losing streak, but barely. Small caps close flat after a choppy action.

Investors shrugged off recent AI-disruption concerns and pushed all three major U.S. stock indexes higher on Wednesday. Nvidia's earnings are due after the closing bell.

U.S. stock futures fluctuated on Tuesday following Friday’s mixed close. Futures of major benchmark indices were mixed at the beginning of the holiday-shortened week as the markets were closed on Monday for Presidents’ Day.

Stock Market Today: The major indexes remain positive after wavering earlier in the session. A vaccine stock bolts higher.

As of 1:20 p.m. ET, the Nasdaq Composite ( ^IXIC 1.32%) index dropped 1.9% lower while the S&P 500 ( ^GSPC 0.64%) fell 1.1%. The Dow Jones Industrial Average ( ^DJI 0.04%), on the other hand, only slipped 0.4% lower:

Markets are struggling to make sense of what the AI revolution means across sectors and industries, and up and down the market-cap scale.

Stock indexes turn lower Thursday, with Nvidia stock pulling back from a post-earnings advance.

The worst day for Nvidia’s stock since last spring dragged the U.S. market lower Thursday even though most stocks on Wall Street rose. The Standard & Poor’s 500 index slipped 0.5% after sharp swings earlier in the week,