Not sure what grocery chains are in your region but hear me out. A few years ago I was keen on buying Kroger stock. It was doing great. Well now in my region Marsh (competitor) is closing lots of stores. So I figure now is the time. Now looking at Kroger stock you see it falling off of a cliff for no apparent reason starting on June 14 (Wednesday) and ending on the 16th (Friday). Then on the 16th Amazon makes its announcement that they are buying Whole Foods and getting into the brick and mortar grocery business. What I'm wondering is who was selling their stocks the two days prior to the announcement? The stock lost 26% in those two days.
I never did buy the stock but I guess this is a good reason to never buy an individual stock.