Why is Microsoft stock sliding to a new 52-week low today?

Microsoft shares fell 3.0% to $354.50, hitting a new 52-week low as multiple headwinds pressured the stock. The biggest factor was EU antitrust regulators’ preliminary finding that Azure may need to be designated a “gatekeeper” under the Digital Markets Act, which could bring interoperability rules, data portability obligations, limits on self-preferencing, and fines of up to 10% of global turnover. Sentiment also worsened after a Nature critique questioned the scientific basis of Microsoft’s quantum-computing claims, just as the company unveiled Majorana 2. Stifel cut its price target to $400 from $415, citing margin pressure from Azure growth and higher capex. The stock underperformed a mostly stable market and is now more than 24% below its start-of-2026 level, with Xbox price hikes adding another cost concern.