Making a noteworthy insider sell on October 15, Pierre Riel, Executive Vice President at Costco Wholesale (NASDAQ:COST), is reported in the latest SEC filing. What Happened: Riel opted to sell 2,000 shares of Costco Wholesale, according to a Form 4 filing with the U.S. Securities and Exchange Commission on Tuesday. The transaction’s total worth stands at $1,793,426. In the Wednesday’s morning session, Costco Wholesale’s shares are currently trading at $881.9, experiencing a down of 1.42%. All You Need to Know About Costco WholesaleCostco operates a membership-based, no-frills retail model, pre…