Hammer prides himself on supporting overlooked startups. Index was the first institutional investor in payment company Adyen (IPO 2018), and Hammer was a seed investor in Robinhood (IPO 2021) after over 70 investors had rejected it.Other key investments include international money transfer provider Wise (direct listing in 2021), operations management app SafetyCulture and capital markets streamlining app Capitolis.Hammer joined Index in 2010, after working as an investor at private equity firm General Atlantic and an investment banker at Morgan Stanley.Czech-born Hammer was ranked No. 4 on the Midas List Europe in 2023.