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Tom Morrisroe

Roscommon man Morrisroe (54) set up a big data company called The Now Factory, which was sold to IBM for around $125m back in 2013. He netted around €74m from that deal. He also owns around a third of Johnny Ronan's Spencer Place Development Company (SPDC). That firm received planning permission to build 325 apartments and a 102-room aparthotel on the site.

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