In this video, health care analysts David Williamson and Max Macaluso discuss some of the biggest movers at the end of last week. We have upgrades, downgrades, and clinical trial action impacting several popular stocks. Watch and find out why these stocks moved and what it means for investors.

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Dave Williamson has no positions in the stocks mentioned above. Max Macaluso has no positions in the stocks mentioned above. The Motley Fool has no positions in the stocks mentioned above. Try any of our Foolish newsletter services free for 30 days. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. The Motley Fool has a disclosure policy.