DoubleDown Interactive ( DDI ) recently took a tumble, falling 23.7% on June 12 after an insider sold shares at $8.50 each. Is it a Buy? I still think it is.I prefer to look for GARP (growth at a reasonable price) stocks but also look for opportunities everywhere else. I don't have a specified time horizon. I invest in a stock for as long as my thesis holds true, and I get out when the facts change. In addition, I've developed market-beating algorithms with Python that have helped me find attractive investm ...