A powerful Microsoft stock rally drove a sharp Wall Street rebound on Thursday. Chipmakers also clawed back recent losses, even as bond market inflation worries stayed firmly in place. Investors welcomed proof that heavy AI spending is finally paying off, but the relief did not extend to every corner of the market.

The S&P 500 climbed 1.7 per cent, more than reversing its steepest single-day drop in seven weeks. Meanwhile, the Dow Jones Industrial Average jumped 613 points, or 1.2 per cent, adding to the day’s broad recovery. The Nasdaq composite, packed with artificial-intelligence stocks, surged 2.8 per cent, just a day after tumbling 9.8 per cent below last month’s record.

Microsoft Leads the Charge on Strong AI Earnings

Microsoft itself leaped 15.5 per cent, marking its best single day in nearly 18 years. The tech giant posted a stronger profit than analysts had expected for the latest quarter. Growth in its Azure cloud business was especially strong, and CEO Satya Nadella said the results reflect how customers are using Microsoft to move into AI.

Just as importantly, Microsoft did not announce a big increase in planned AI spending, unlike several Big Tech rivals. That restraint eased investor worries that runaway spending is eating into cash flows without delivering matching returns. As a result, the Microsoft stock rally became the single biggest force lifting the broader market.

However, not every tech giant shared in the good news. Meta Platforms fell 8 per cent after reporting weaker profit than expected, even though its revenue slightly beat forecasts. Additionally, the company raised the lower end of its forecasted spending range for the year, which unsettled investors already nervous about AI costs.

Chipmakers Bounce Back After a Rough Stretch

Companies that supply memory chips and processors to AI-focused “hyperscalers” also rallied Thursday. These stocks had taken heavy losses recently on fears that AI-driven valuations climbed too high, too fast. Micron Technology jumped 18.4 per cent, trimming its weekly loss to just 5 per cent, and became the second-biggest driver of the S&P 500’s gains.

Similarly, Lam Research, a key semiconductor-industry supplier, soared 18 per cent after beating profit and revenue expectations. Chip giant Advanced Micro Devices also rallied 13 per cent, further reinforcing the sector-wide bounce. On the losing side, however, Jersey Mike’s Subs fell 6 per cent during its first day of trading on the New York Stock Exchange.

By the closing bell, the S&P 500 rose 121.48 points to 7,437.63. The Dow climbed 613.92 points to 52,208.06, while the Nasdaq composite leaped 679.24 points to 25,122.18. Together, these gains erased much of the anxiety that had gripped markets just one day earlier.

Bond Market Inflation Worries Keep Investors on Edge

Even so, longer-term Treasury yields held steady following their sharp climb on Wednesday. Those yields had jumped after Federal Reserve chairman Kevin Warsh offered few clues about future interest rate moves. Because inflation remains painfully high, higher rates could help contain it, though they can also slow growth and pressure stock prices.

The yield on the 10-year Treasury held at 4.67 per cent, unchanged from late Wednesday. Meanwhile, the 30-year Treasury yield ticked up slightly to 5.22 per cent from 5.20 per cent. These yields typically move in line with investor expectations for inflation and economic growth in coming years.

Warsh reaffirmed the Fed’s goal of bringing inflation back to 2 per cent, even though officials chose not to raise rates despite inflation running above target. He also suggested that the bond market may already be doing some of the Fed’s work by pushing yields higher on its own. This has left investors questioning whether the Fed is truly prepared to act if inflation worsens.

Seema Shah, chief global strategist at Principal Asset Management, addressed this uncertainty directly. She warned:

“If investors conclude that the latter is true, the credibility of the Fed’s inflation-fighting commitment could come under increasing scrutiny. Arguably, it already is.”

President Donald Trump, who nominated Warsh to lead the Fed, has meanwhile pushed for lower interest rates. Notably, this stance persists even though lower rates could cause inflation to accelerate further. Consequently, the tension between political pressure and inflation control continues to shape bond market sentiment.

Economic Data and Global Markets Add to the Picture

Reports released Thursday indicated that U.S. economic growth slowed more than economists had expected this spring. At the same time, a key inflation measure remained above the Federal Reserve’s target last month, though it did slow from May’s pace. Together, these signals painted a mixed picture of an economy still wrestling with high prices.

In the oil market, prices eased, with Brent crude falling 1.4 per cent to settle at $86.88 per barrel. Earlier this month, oil had swung as low as $72 and as high as $102 amid uncertainty over a potential U.S.-Iran deal on tanker access through the Middle East. Therefore, oil markets remain highly sensitive to geopolitical developments.

Global stock indexes were mixed as well. South Korea’s Kospi fell 1.2 per cent, while France’s CAC 40 rose 0.9 per cent, marking two of the world’s bigger moves. Seoul’s market has been at the center of AI-driven swings all year, largely because it is dominated by Samsung Electronics and SK Hynix.

After more than doubling during the first six months of the year, the Kospi has plunged 34 per cent so far in July. This drop continued Thursday as Samsung Electronics dipped 0.7 per cent. The company reported a record spring profit and said chip demand continues to outpace supply, yet its results still fell short of analysts’ high expectations.

Key Takeaways for Investors

Overall, Thursday’s session showed how quickly sentiment can shift when a single earnings report changes the AI-spending narrative. The Microsoft stock rally proved that strong execution, not just big spending, can restore investor confidence. At the same time, ongoing bond market inflation worries suggest the rally may face fresh tests in the weeks ahead.

For now, investors appear willing to reward companies showing real AI profitability while punishing those raising spending without matching results. Meanwhile, the Federal Reserve’s next moves on interest rates will likely remain the biggest swing factor for markets. As always, both corporate earnings and central bank policy will continue driving Wall Street’s direction.