Two days ago the mood on Wall Street was close to despair. Last night it looked like nothing had ever been wrong. The Nasdaq Composite jumped 2.8% to close at 25,122.18, snapping a six day losing streak that had traders bracing for a correction. The S&P 500 climbed 1.7% to 7,437.63 and the Dow added 613 points to finish at 52,208.06. This was not a quiet grind higher. It was a full reversal of everything the market feared just 48 hours earlier, and almost the entire move traces back to one company reporting after the bell.

Microsoft is the reason your feed looked different this morning. The stock surged roughly 16% after the company reported accelerating growth in its Azure cloud business, and in a single session it added about 450 billion dollars in market value, the largest one day gain for any stock in history. To put that in perspective, that is more value created in one afternoon than most entire stock exchanges are worth. Information technology led every sector on the board, rising about 4% while consumer discretionary names added another 1.3%. When a stock this large moves this fast, it does not just lift its own price. It drags the whole index with it, which is exactly what happened here.

The second engine behind the rally was semiconductors, and this part of the story matters because chips had been the market's biggest source of fear all month. The iShares Semiconductor ETF jumped more than 8% in a single session. Micron Technology surged 18%, Advanced Micro Devices climbed over 13%, and Lam Research popped more than 22% after a beat and raise quarter that triggered a wave of price target upgrades from Wall Street analysts. This is the same sector that had been dragging the Nasdaq down for six straight sessions on fears that AI spending was slowing. One earnings season later, the exact same names became the reason the market ripped higher, which tells you how fast sentiment can flip when the underlying numbers actually show up.

None of this makes sense without understanding what happened two days before. The Federal Reserve held interest rates steady, and instead of relief, the market read it as a warning that inflation was not under control. The Dow tumbled 2.2%, its worst single day since April 2025, and the S&P 500 slid 1.5% as investors dumped the same AI and semiconductor names that would later lead the recovery. Fresh GDP data showing the economy grew just 1.5% in the second quarter, below what economists expected, added to the unease. It is a reminder that markets do not always move on new information. Sometimes they move on a mood, and that mood can swing from fear to euphoria inside of 48 hours.

With 20 years of investment expertise, Caleb Gan is a seasoned professional in stock trading. The hard work and dedication were recognized when his partner and him were featured on Singapore TV Channel 9's MoneyWeek, a prominent financial program. He's also had the privilege to share insights on radio stations like 93.8Live, Capital 95.8FM, and 96.3FM through live interviews about stock market investments. Beyond that, he's also the co-founder of NDU System, where he continues to help others navigate the world of trading.

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