Ken Griffin

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A Ryanair Boeing 737 aircraft approaches Paris-Beauvais airport in Tille, northern France. Photograph: Christian Hartmann/Reuters.

Citadel Europe, the hedge fund founded by billionaire Ken Griffin, has taken a 0.56 per cent short position in Ryanair, according to data disclosed to(...)

1 Grand Canal Square in Dublin’s Docklands

Citadel Securities, the largest US equity trader, has opened an office in Dublin as part of a European expansion and plans to employ at least 50 staff(...)

There is a hefty weight of experience coursing through these songs: Dublin vocalist and primary songwriter Ken Griffin was once in Irish bands Roller(...)