Sergio obviously is privy to insider information. Since MAIN management stated July same store sales remain ahead of guidance, the only possible negative for MAIN would be a drastic drop in same store sales in the first 3 weeks of August. I really doubt that is the case, because MAIN's stock would drop drastically. This could easily trigger a class action lawsuit.
MAIN's management is WAAAAYYYYY too smart for that, therefore it is safe to conclude that same store sales remain strong, or else Sergio would not have sold any shares at this time.