Arena Pharmaceuticals investors, it has been a wild ride. Shares may be down 15% today from profit taking, but this stock is still a six-bagger year to date. However, June 27 looms large, as investors could be handsomely rewarded or left picking up the pieces. Find out why, and what health care editor David Williamson is urging investors to do.

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David Williamson holds no position in any company mentioned. Click here to see his holdings and a short bio. The Motley Fool has a disclosure policy. We Fools may not all hold the same opinions, but we all believe that considering a diverse range of insights makes us better investors. Try any of our Foolish newsletter services free for 30 days.