Liberty Broadband Corp, Board Member at Charter Communications (NASDAQ:CHTR), executed a substantial insider sell on October 15, according to an SEC filing. What Happened: Corp’s decision to sell 10,400 shares of Charter Communications was revealed in a Form 4 filing with the U.S. Securities and Exchange Commission on Tuesday. The total value of the sale is $3,448,120. As of Wednesday morning, Charter Communications shares are down by 0.0%, currently priced at $331.94. All You Need to Know About Charter CommunicationsCharter is the product of the 2016 merger of three cable companies, each with…