Good morning. This is TheStreet's Stock Market Today for Aug. 20, 2025. The stock market is now open. At last look, the indexes are near session lows. The Dow (-0.26%), which started the day in the green, is now down. It joins the Russell 2000 (-0.83%), S&P 500 (-0.88%), and Nasdaq (-1.64%).

The weighting of Mag 7 stocks in the S&P 500 just soared past 34%. Find out why that matters from a historical perspective, and how to navigate it using Barchart tools.

President Trump's tariffs continue to affect global markets and the economy. Follow along for live updates on stocks, bonds and other markets, including the Dow Jones Industrial Average, S&P 500 and Nasdaq Composite.

With inflation eating into your savings, relying solely on your nine-to-five paycheck might not be enough. This is where investing comes in. The stock market is in the red again, with major indexes wobbling on renewed concerns about economic growth and interest rate policy.

Even the strongest bull market has an Achilles’ heel, and this one might even have two. Stocks were edging lower to start the week, but the S&P 500 was still up nearly 10% since the start of 2025, just a hair’s breadth below last week’s record close of 6468.

Just four Big Tech stocks — Nvidia, Microsoft, Meta, and Broadcom — account for 60 percent of the benchmark index’s total returns so far this year, according to a new analysis from DataTrek Research. They’re also responsible for pushing headline valuation levels to dot-com bubble levels.

The Nasdaq Composite extended its slide on Tuesday–and even the Dow Jones Industrial Average was struggling after hitting an intraday record this morning. The tech-heavy index was down 1.5%, while the Dow was down 90 points,

The S&P 500 trades at an expensive valuation that has historically preceded negative returns over the next one, two, and three years.

Canada's major stock index rose on Wednesday as resource shares notched gains and investors awaited the start of bank earnings season.