| 2019-03-05 | Mills Stacy | Vice President and Controller | Sell | 1,245 | $92.60 | $115,284.14 | -29.9% | → |
| 2019-03-05 | Glaser Daniel S | President and CEO, MMC | Sale+OE | 179,451 | $92.03 | $16,515,557.44 | -51.2% | → |
| 2019-03-05 | Beshar Peter J | EVP and General Counsel | Sell | 8,985 | $92.70 | $832,873.56 | -3.0% | → |
| 2019-03-05 | Gilbert E Scott | SVP, Chief Information Officer | Sell | 3,660 | $92.66 | $339,134.50 | -7.8% | → |
| 2019-03-05 | HEARN PETER C | President & CEO, Guy Carpenter | Sell | 2,562 | $92.68 | $237,441.04 | -56.1% | → |
| 2019-03-05 | McDonald Scott | President and CEO of OWG | Sell | 5,521 | $92.82 | $512,444.31 | -18.3% | → |
| 2019-03-05 | MCGIVNEY MARK C | Chief Financial Officer | Sell | 6,519 | $92.63 | $603,871.27 | -16.2% | → |
| 2019-02-25 | Beshar Peter J | EVP and General Counsel | Sale+OE | 67,655 | $93.14 | $6,301,251.39 | -18.6% | → |
| 2019-02-25 | Gilbert E Scott | SVP, Chief Information Officer | Sale+OE | 12,677 | $92.77 | $1,176,045.29 | -22.7% | → |
| 2019-02-25 | MCGIVNEY MARK C | Chief Financial Officer | Sale+OE | 13,867 | $92.91 | $1,288,355.24 | -29.2% | → |
| 2019-02-04 | Gilbert E Scott | SVP, Chief Information Officer | Sale+OE | 89,789 | $90.05 | $8,085,679.03 | -67.5% | → |
| 2019-02-04 | McDonald Scott | President and CEO of OWG | Sale+OE | 11,245 | $90.34 | $1,015,873.30 | -31.3% | → |
| 2018-08-29 | Gilbert E Scott | SVP, Chief Information Officer | Sale+OE | 80,646 | $84.64 | $6,825,635.50 | -65.1% | → |
| 2018-03-05 | Portalatin Julio A | President and CEO, Mercer | Sell | 10,911 | $81.87 | $893,272.66 | -15.6% | → |
| 2018-03-05 | Mills Stacy | Vice President and Controller | Sell | 1,145 | $82.95 | $94,972.03 | -28.1% | → |
| 2018-03-05 | McDonald Scott | President and CEO of OWG | Sell | 20,000 | $81.87 | $1,637,320.00 | -44.9% | → |
| 2018-03-05 | Beshar Peter J | EVP and General Counsel | Sell | 10,567 | $81.75 | $863,820.55 | -4.2% | → |
| 2018-03-05 | Glaser Daniel S | President and CEO, MMC | Sell | 41,504 | $81.88 | $3,398,140.00 | -13.0% | → |
| 2018-03-02 | Gilbert E Scott | SVP, Chief Information Officer | Sale+OE | 52,782 | $81.33 | $4,292,548.93 | -55.0% | → |
| 2018-02-26 | MCGIVNEY MARK C | Chief Financial Officer | Sale+OE | 22,528 | $83.59 | $1,883,115.52 | -20.8% | → |
| 2018-02-05 | McDonald Scott | President and CEO of OWG | Sale+OE | 11,418 | $84.86 | $968,940.42 | -13.0% | → |
| 2017-12-19 | Glaser Daniel S | President and CEO, MMC | Sale+OE | 618,557 | $82.80 | $51,214,368.72 | -52.6% | → |
| 2017-10-30 | OKEN MARC D | Director | Buy | 1,235 | $80.89 | $99,901.00 | +16.1% | → |
| 2017-08-21 | Gilbert E Scott | SVP, Chief Information Officer | Sale+OE | 30,000 | $77.31 | $2,319,309.00 | -43.8% | → |
| 2017-05-16 | Ledford Laurie | SVP & Chief HR Officer | Sale+OE | 184,305 | $74.03 | $13,643,546.24 | -97.2% | → |
| 2017-03-13 | RAPPORT ROBERT J | SVP and Controller | Sale+OE | 7,011 | $73.88 | $517,951.65 | -20.1% | → |
| 2017-03-10 | Glaser Daniel S | President and CEO, MMC | Sale+OE | 488,487 | $73.17 | $35,743,038.88 | -36.8% | → |
| 2017-03-07 | Glaser Daniel S | President and CEO, MMC | Sale+OE | 208,651 | $73.86 | $15,410,019.81 | -27.2% | → |
| 2017-03-03 | Beshar Peter J | EVP and General Counsel | Sale+OE | 87,180 | $74.11 | $6,460,473.90 | -39.4% | → |
| 2017-03-02 | Zaffino Peter | Chairman, RIS and CEO, Marsh | Sell | 28,913 | $74.32 | $2,148,727.42 | -17.9% | → |
| 2017-02-22 | Gilbert E Scott | SVP, Chief Information Officer | Sale+OE | 41,474 | $72.77 | $3,018,021.51 | -55.3% | → |