I'd say the most important are: 1. broad and deep business background (product, design, marketing, management, strategy, finances, market analysis, etc) 2.

I'd say the most important are: 1. broad and deep business background (product, design, marketing, management, strategy, finances, market analysis, etc) 2. due diligence skills (ie., knowing how to evaluate a company, product, leadership, market/competitive position, etc) 3. skills in evaluating a company both quantitatively and qualitatively 4. skills in technical analysis of stocks