A substantial insider sell was reported on August 22, by Javier Rodriguez, Chief Executive Officer at DaVita (NYSE:DVA), based on the recent SEC filing. What Happened: Rodriguez’s decision to sell 334,166 shares of DaVita was revealed in a Form 4 filing with the U.S. Securities and Exchange Commission on Thursday. The total value of the sale is $50,850,040. DaVita shares are trading up 0.76% at $153.51 at the time of this writing on Friday morning. Get to Know DaVita BetterDaVita is the largest provider of dialysis services in the United States, boasting market share that eclipses 35% when mea…