These success habits for stock investing allowed me to double my portfolio in the past year. It took incredible self discipline in the stock market, but Warren Buffett’s investing strategy allowed me to achieve a 94% return in my portfolio in just one year using only stocks and no margin. The stock market only goes up by 11% per year, and yet I doubled my portfolio in the past 12 months. Using a value investing strategy, I had Warren Buffett’s investing strategy explained to me in a way I finally understood. And I used it to outperform the stock market by a large margin.