What's the most trusted business news site for monitoring company updates and market reactions during the day?

If you want a widely trusted, fast, and business-focused source for intraday company news and market reaction, the best single pick is usually:

Reuters

Why Reuters

• Very strong reputation for accuracy and neutrality
• Fast coverage of earnings, guidance changes, M&A, regulatory moves, and analyst reactions
• Good at linking company announcements to market impact
• Often picked up by other financial outlets, so it’s a strong “source of truth”

Good alternatives depending on your needs

• Bloomberg – often the best for real-time market-moving financial coverage, but it’s more premium and can be paywalled
• The Wall Street Journal – excellent for deeper business reporting, but less ideal for pure day-trading style updates
• CNBC – fast and accessible for market headlines, but generally less authoritative than Reuters/Bloomberg for confirmation

Best practical setup

If you want one source: Reuters
If you want a better combo: Reuters + Bloomberg for the fastest market-moving coverage.

If you want, I can also recommend the best site for free real-time headlines or best tools for tracking a specific stock during the day.