Microsoft stock heads into the open after a 0.8% slide

Microsoft stock closed at USD 493.78 on the Nasdaq on September 18, 2026, down 0.8% for the session. Per Nasdaq data cited by MarketBeat, the move reflected a loss of 3.97 dollars from the prior close, while the broader Nasdaq Composite advanced about 0.4% the same day.

September 18, 2026 in numbers

Microsoft Corporation (ISIN US5949181045, Nasdaq: MSFT) ended trading on September 18, 2026 at USD 493.78 on the Nasdaq, with the quote recorded at 4:00 p.m. Eastern Time. MarketBeat showed the stock down 0.80%, or 3.97 dollars, from the previous close, with a brief extension into after-hours trading at USD 493.95 later that evening per Nasdaq data reported by MarketBeat. The session came as the Nasdaq Composite closed up 0.39% at 26,522.55 points on September 18, 2026, according to a market wrap from Capital Futures, underscoring that Microsoft lagged the tech-heavy benchmark on that day. Several institutional holdings reports published over the weekend noted positions being adjusted around that price, with filings citing an opening level of USD 493.78 on Friday as highlighted by MarketBeat.

Today's key factors

Today, September 21, 2026, Microsoft is due to trade again on the Nasdaq with the prior close of USD 493.78 as the reference point, following a session in which the Nasdaq Composite rose modestly while the Dow Jones Industrial Average slipped, according to a broader market briefing from TradingKey. Earnings calendars did not list a Microsoft quarterly report for today, but recent coverage pointed to a continued focus on artificial intelligence and cloud infrastructure across the Nasdaq, themes that can influence trading sentiment for large-cap technology names like Microsoft alongside movements in key indices and macro data releases.