Stock market today: Dow, S&P 500, and Nasdaq slide amid Nvidia antitrust probe and looming inflation data concerns.

The stock market faced another turbulent session today, with all major indexes ending in the red as investors grappled with multiple challenges from both domestic and international fronts. The Dow Jones Industrial Average (^DJI) slid by 0.37%, the S&P 500 (^GSPC) dipped by 0.58%, and the Nasdaq Composite (^IXIC) fell by 0.66%.

Leading today's downturn was the performance of Nvidia, which took a significant hit after news broke that Chinese authorities are initiating an antitrust probe against the tech giant, knocking its stock price down substantially. This development added to the ongoing jitters over increasing tech sector regulation globally, exacerbating existing market concerns.

Adding to the nervousness, investors are bracing for crucial consumer inflation data set to be released later in the week. The anticipation around the Consumer Price Index (CPI) figures is particularly significant, given its potential impact on the Federal Reserve's monetary policy decisions. With the next Federal Open Market Committee (FOMC) meeting around the corner, market participants are cautious, considering the prospects of a potential rate cut.

Meanwhile, the S&P 500 faces additional pressure as it undergoes its regular index rebalancing. Notable changes include the addition of Apollo Global Management and Workday, replacing Qorvo and Amentum, which has ramifications for investment portfolios and trading volumes in the near term.

The volatility did not spare the Nasdaq, heavily weighted by tech stocks, which bore the brunt of today's selling, exacerbated by Nvidia's slump and the broader scrutiny over tech firms by regulators globally. Despite the setback, optimism remains for a recovery buoyed by robust tech earnings, provided regulatory hurdles can be managed effectively.

Furthermore, themes emerging from Wall Street discussions highlight a continued focus on AI and technology sector momentum driving future growth. Analysts remain split, however, on whether current trends can sustain the high valuations seen in many tech stocks and their impact on broader market sentiments.

Overall, as the week progresses, much of the market's direction will hinge on forthcoming inflation data and its implications for Fed policy, a subject of intense speculation amid hopes for continued economic growth balanced against inflationary pressures. Investors remain watchful, navigating the thin line between growth optimism and real-time economic data that could sway market trajectories.

In the midst of all this, U.S.-China relations add another layer of complexity, particularly for tech companies deeply entangled in cross-border trade and supply chains. As geopolitical dynamics evolve, they continue to wield significant influence over investor sentiment and market volatility. As such, the coming days will be crucial in setting the direction for year-end equity performance.