Marsh & McLennan Companies, Inc. (NYSE:MMC) has found itself engulfed a whirlwind of M&A activity as yet another buyer has surfaced that is interested one of its divisions. This time the Sunday Times has reported that founder Jules Kroll is interested in buying back Kroll Inc. for $1.9 billion, a company which MMC purchased from Jules just two years ago.

The company has also been under pressure from shareholders to sell off its Putnam Investments division, which has been the subject of many acquisition offers and partnership requests. Finally, the Sunday Times also reported a few weeks ago that the Willis Group had made an offer with backing from Kohlberg Kravis Roberts LLC, which was later rebuffed by MMC and said to be merely "conjecture and speculation" by the Willis Group. Combined, all of these factors are causing shareholders to consider the notion of breaking up the company, which could result in substantial premiums to the current market prices. This is definitely a stock worth keeping an eye on!

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