Despite closing in the green, the S&P 500's Healthcare Index declined by 1.8% last week, overshadowed by President Trump's introduction of significant tariffs on branded drugs. Centene and Molina Healthcare recorded notable gains, each increasing by nearly 10%, while other companies like Mettler-Toledo and Regeneron faced declines of approximately 5%. Berkshire Hathaway's $1.57 billion stock purchase indicates continued investor interest, even as major players like UnitedHealth and Molina contend with pressures from rising costs and shifting market dynamics.