Bill McCabe's Oyster Group is an investor in a host of tech and quirky companies - from Datahug, Fleetmatics and FieldAware to psychic phoneline firm Psytech Digital.
McCabe (62), who was born in Belfast, made his fortune when CBT, the e-learning company that he founded, floated on the Nasdaq in the 1990s, making him over €65m in share sales.
He's been a significant backer of breast implant-maker GC Aesthetics, which raised €85m in new capital last year. But the Dublin-headquartered firm has been under some pressure over the last several years from substantially lower profit margins. It's difficult to see McCabe getting back the cash he's put into it any time soon. Hopes of an IPO were dashed in 2015.
Oyster has also backed property in Cork, John Mullins's renewable energy group, Amarenco, and the firm is also believed to be a backer of top VC, Atlantic Bridge. A luxury home member club for wealthy people that McCabe set up - the joining fee was €300,000 - went wallop in 2016, having lost €6m.