As Gensol Engineering is being investigated by several agencies like Sebi over financial crunch, its promoters have seen their shareholding drop by more than half since December. According to stock exchange data till Tuesday, analysed by The Economic Times, cofounders Anmol Singh Jaggi and Puneet Singh Jaggi, their mother Jasminder Kaur, and promoter group Gensol Ventures lost 57% stake since December 31.