Today's Stock Market: S & P 500 and Dow Jones fell due to Canadian trade restrictions

U.S. stocks opened lower on Wednesday as investors weighed the escalation of U.S. -Canada trade restrictions, higher bond yields and the Federal Reserve's expectation of a September interest rate hike.

On Wednesday, U.S. stocks opened lower. Investors are assessing a new round of upgrades in U.S. -Canada trade restrictions, soaring Treasury yields and widespread expectations that the Federal Reserve may raise interest rates at its September meeting.

According to Reuters, the Dow Jones Industrial Average opened at 52,707.9 points, down 0.15%; the S & P 500 Index opened at 7,660.68 points, down 0.17%; and the Nasdaq Composite Index fell 0.36% to 26,325.06 at the opening bell.

Selling pressure intensified shortly after trading began. As of around 9:46 am ET, the Dow fell to 52,435.25 points, a drop of 0.68%, after hitting an intraday low of 52,381.24. The S & P 500 index closed at 7,652.80 points, down 0.27%, and dropped to a low of 7,646.91 in early trading.

S & P 500 futures reversed before the opening

The spot market opened weak after a significant reversal in the trend of S & P 500 futures. Early on Wednesday, E-mini S&P 500 futures climbed to near 7,690, but fell sharply near 7,665 before the opening bell.

This reversal shows how quickly market sentiment is deteriorating as investors reassess trade policy, bond yields and the possibility of further tightening monetary policy.

Dow sell-off accelerates after the opening bell

The Dow experienced a steeper decline in early trading. Its 30-minute chart shows the index opened around 52,713, then fell below 52,700, and then below 52,500.

In addition, the index is trading well below the 50-cycle exponential moving average (EMA), which is around 53,124, putting pressure on the short-term technical structure.

After Wednesday's early lows, the 52,380-52,400 area is the first support level to watch. If it can rebound above 52,700, it will start to repair the intraday trend; if it continues to trade below the opening range, sellers will continue to control the situation.

The S & P 500 tests support below its short-term moving average

The S & P 500 index is also below its 50-cycle exponential moving average, and the 30-minute chart provided shows the average at approximately 7,696.50. The index dropped to a low of 7,646.91 shortly after the opening bell sounded, and then tried to stabilize.

Currently, the 7,640-7,650 area is the direct support area. A break below this area may expose the low of early September, near 7,620. From a rising perspective, the S & P 500 needs to recover about 7,670 points before it can challenge the key area of 7,695-7,700 points near its short-term moving average.

Although Barclays raised its end-of-2026 S & P 500 target from 7,800 to 7,950, citing strong corporate earnings and continued artificial intelligence investment, the bank still pointed to inflation, geopolitical uncertainty and a tighter interest rate environment as potential risks to valuations.

US-Canada trade restrictions put regulation in focus

Washington's latest measures against Canada were one of the most important policy developments in the stock market on Wednesday.

President Donald Trump signed five executive orders under Section 338 of the Customs Act of 1930 after Canada imposed retaliatory tariffs on approximately $20 billion in U.S. exports.

The U.S. response includes imposing import restrictions on some Canadian products and adjusting the scope of existing tariffs. Product additions and deletions will take effect on September 15, while a separate import ban will come into effect on September 29.

The White House also stated that Article 338 tariffs apply to regulated products regardless of whether they qualify as goods of origin under the US-Mexico-Canada Agreement (USMCA). These tariffs are imposed in addition to applicable Article 232 tariffs.

For investors, its significance is not limited to the industries directly affected. Additional trade barriers could increase business costs, disrupt North American supply chains, and make pricing decisions for manufacturers and retailers more complex.

FedWatch data shows that interest rate hikes have become the benchmark market situation

Interest rate expectations add another layer of pressure to the stock market.

The CME FedWatch tool chart shows that traders believe the probability of the Fed raising interest rates by 25 basis points at the September 16 resolution meeting is 60.2%. The move will increase the federal funds target rate range from 3.50% to 3.75% to 4.00%.

The probability that the Fed will keep interest rates unchanged is 39.8%.

This draws an important dividing line between markets and economists. A Reuters poll conducted from September 4 to 9 showed that about 70% of economists expect the Fed to keep interest rates unchanged at its September meeting, despite an increase in the number of people expecting policy tightening.

The shift in expectations is crucial for the stock market, as higher policy rates will push up financing costs and increase the discount rate applied to future corporate earnings, especially for growth companies with higher valuations.

Treasury-bond repurchase adds another policy catalyst

The Treasury Department is also changing its operations in the government bond market, effective Wednesday.

The Treasury Department said it will at least double the maximum size of liquidity-backed repos for 10-to 20-year and 20-to 30-year securities, increasing the limit per operation from $2 billion to at least $4 billion until November 4.

The announcement is significant for the stock market because long-term Treasury yields are a key benchmark for stock valuations, corporate borrowing costs and mortgage rates.

Therefore, investors will be watching closely whether the repurchase program helps stabilize long-term yields so that the market can prepare for the Fed's next decision.

Instant messages from Wednesday's opening trading indicate that policy risks have moved to the center of the market. As investors digest the more hawkish U.S. -Canada trade relationship, higher interest rate expectations and changes in government bond market operations, the S & P 500 and Dow are trading low, and Wall Street is highly sensitive to the next round of inflation data and Federal Reserve signals.