Vanguard Group has reached out to its clients amid a sharp downturn in the markets, urging them to "resist the urge to deviate from [their] financial plan." The firm is encouraging investors to maintain their positions and avoid withdrawing funds during this period of volatility. This communication comes as broader market sentiments appear to be shifting, with concerns about potential panic among investors. Analysts suggest that maintaining confidence in large-cap U.S. stocks is crucial for market stability. Vanguard's message reflects a broader strategy to instill calm among investors during turbulent times.