Tom Gayner acquired 619 Thousand Marsh & McLennan Cos. shares worth $92.7 Million. That's 1.29% of their equity portfolio (24th largest holding). The first Marsh & McLennan Cos. trade was made in Q4 2007. Since then Tom Gayner bought shares eight more times and sold shares on five occasions. The stake costed the investor $23.4 Million, netting the investor a gain of 297% so far.