Dutch software firm Elastic's Co-founder Steven Schuurman more than doubled his fortune in two months to become a billionaire as the company's shares surged, according to Bloomberg. Schuurman's 19% stake in Elastic is valued at $1.1 billion. He co-founded Elastic in 2012 with three others and previously co-founded SpringSource, which was acquired by VMware in 2009 for $362 million.