RSJ Securities

RSJ Securities started in 1994 when Karel Janecek, then 21, began trading from Plzen; he went on to finish a PhD in mathematical finance at Carnegie Mellon while the firm grew into one of Europe's larger participants in short-term interest-rate futures. After moving to Prague around 2000, RSJ put through its first LIFFE derivatives trade that year and its first fully algorithmic trade in 2004.

Today it is the HFT arm of the wider RSJ group, staffed entirely in Prague and co-located at the major venues, making markets in STIR futures, bond options, and equity-index derivatives across ICE, CME, Eurex, and the Osaka Exchange. The broader group also spans investments and a philanthropic foundation.