Today's biggest winners and losers in the stock market.

On this episode of Stock Movers, we take a look at some of the week's biggest gainers and decliners:

- Compass Pathways (CMPS) shares surged Tuesday after the company said its psilocybin therapy for depression met its primarily goals in recent trials.

- Masimo (MASI) stocks spiked around 34% in enormous volume on news that it would be acquired by Danaher for $180 a share in cash, or about $9.9 billion.

- General Mills (GIS) shares slide 3.4% after the packaged foods company cut its adj. earnings per share (constant currency) and organic net sales forecasts for the full year.