A .4% loss in share since February, according to one website? Isn't that a little small and short-term to draw such a firm conclusion? or am I missing something

A .4% loss in share since February, according to one website? Isn't that a little small and short-term to draw such a firm conclusion? or am I missing something significant? Especially when, according to that same survey, it's up 1.7% since this time last year...