The overwhelming volume of sell transactions relative to buy transactions by company insiders over the last six months in key leading sectors of the market is the worst Alan Newman, editor of the Crosscurrents newsletter, has ever seen since he began tracking the data. The strategist looked at insider trading activity amongst the top ten companies that make up the Nasdaq such as Apple [AAPL 308.05 -0.79 (-0.26%) ], Google [GOOG 618.60 2.10 (+0.34%) ] and Amazon [AMZN 169.95 0.95 (+0.56%) ]. Then he analyzed the biggest members of the Retail HOLDRs ETF like Gap [GPS 19.68 0.32 (+1.65%) ],...