| 2019-02-20 | O'Connor Michael J | Co-President | Sell | 22,815 | $172.74 | $3,940,974.21 | -8.1% | → |
| 2019-02-19 | LIEB PETER M | General Counsel | Sell | 15,068 | $172.77 | $2,603,281.75 | -30.2% | → |
| 2019-02-19 | Neller Michael | Principal Accounting Officer | Sell | 1,250 | $171.66 | $214,575.00 | -32.2% | → |
| 2019-02-15 | Davies Christa | Chief Financial Officer | Sale+OE | 58,152 | $170.90 | $9,938,466.08 | -5.9% | → |
| 2018-11-07 | Grace Caroline | CEO, Global Retirement & Inves | Sell | 4,000 | $160.00 | $640,000.00 | -8.7% | → |
| 2018-09-19 | Grace Caroline | CEO, Global Retirement & Inves | Sell | 4,000 | $155.00 | $620,000.00 | -8.0% | → |
| 2018-09-06 | Grace Caroline | CEO, Global Retirement & Inves | Sell | 4,000 | $150.00 | $600,000.00 | -7.4% | → |
| 2018-08-20 | Neller Michael | Principal Accounting Officer | Sell | 750 | $143.58 | $107,682.75 | -48.8% | → |
| 2018-08-06 | CAMPBELL JEFFREY C | Director | Buy | 5,550 | $143.84 | $798,289.80 | +361.8% | → |
| 2018-05-24 | Andersen Eric | Co-President | Sale+OE | 5,000 | $142.39 | $711,950.00 | -6.9% | → |
| 2018-05-16 | Neller Michael | Principal Accounting Officer | Sell | 1,000 | $140.93 | $140,930.00 | -45.1% | → |
| 2018-03-09 | LIEB PETER M | General Counsel | Sell | 14,772 | $145.00 | $2,141,940.00 | -48.0% | → |
| 2018-03-09 | O'Connor Michael J | CEO, Aon Risk Solutions | Sell | 9,855 | $145.00 | $1,428,975.00 | -7.4% | → |
| 2018-03-01 | Neller Michael | Principal Accounting Officer | Sell | 1,500 | $140.12 | $210,180.00 | -44.4% | → |
| 2018-02-21 | Goland Anthony R | Chief Human Resources Officer | Sell | 2,124 | $141.16 | $299,823.84 | -89.1% | → |
| 2018-02-21 | LIEB PETER M | General Counsel | Sell | 1,611 | $141.24 | $227,535.72 | -1.7% | → |
| 2018-02-20 | O'Connor Michael J | CEO, Aon Risk Solutions | Sell | 1,411 | $140.23 | $197,864.53 | -1.0% | → |
| 2018-02-20 | Meissner Laurel G. | Global Controller | Sell | 7,940 | $140.23 | $1,113,426.20 | -39.2% | → |
| 2018-02-20 | Davies Christa | Chief Financial Officer | Sell | 3,237 | $140.99 | $456,372.04 | -0.7% | → |
| 2018-02-16 | Davies Christa | Chief Financial Officer | Sale+OE | 96,570 | $140.92 | $13,608,393.20 | -15.0% | → |
| 2018-02-06 | KNIGHT LESTER B | Director | Buy | 60,000 | $138.42 | $8,305,300.00 | +27.8% | → |
| 2018-02-02 | Zern John | CEO, Aon Global Health | Sell | 14,747 | $147.00 | $2,167,809.00 | -53.2% | → |
| 2018-02-02 | O'Connor Michael J | Chief Executive Officer, ARS | Sale+OE | 12,824 | $145.00 | $1,859,480.00 | -10.1% | → |
| 2018-01-31 | LIEB PETER M | EVP & General Counsel | Sell | 4,200 | $141.39 | $593,838.00 | -20.6% | → |
| 2017-11-30 | Zern John | CEO, Global Health & Benefits | Sell | 17,680 | $139.79 | $2,471,487.20 | -39.0% | → |
| 2017-11-30 | Meissner Laurel G. | SVP & Global Controller | Sell | 4,000 | $141.20 | $564,800.00 | -24.5% | → |
| 2017-11-14 | Andersen Eric | CEO, Aon Benfield | Sell | 10,000 | $143.52 | $1,435,200.00 | -16.2% | → |
| 2017-11-09 | BRUNO JOHN G | Executive Vice President, CIO | Sell | 10,000 | $143.24 | $1,432,400.00 | -48.8% | → |
| 2017-09-19 | O'Connor Michael J | Chief Executive Officer, ARS | Sale+OE | 10,000 | $145.00 | $1,450,000.00 | -8.1% | → |
| 2017-09-06 | O'Connor Michael J | Chief Executive Officer, ARS | Sale+OE | 10,000 | $140.28 | $1,402,800.00 | -8.1% | → |
| 2017-05-25 | LIEB PETER M | EVP & General Counsel | Sell | 2,000 | $130.40 | $260,800.00 | -9.0% | → |
| 2017-05-18 | Meissner Laurel G. | SVP & Global Controller | Sell | 4,000 | $126.19 | $504,760.00 | -19.7% | → |
| 2017-03-30 | LIEB PETER M | EVP & General Counsel | Sell | 16,683 | $117.29 | $1,956,749.07 | -42.9% | → |
| 2017-02-28 | LIEB PETER M | EVP & General Counsel | Sell | 18,017 | $116.11 | $2,091,953.87 | -31.7% | → |
| 2017-02-22 | Case Gregory C | President & CEO | Sell | 520,000 | $115.58 | $60,102,963.43 | -23.8% | → |
| 2017-02-21 | O'Connor Michael J | Chief Executive Officer, ARS | Sell | 13,591 | $116.70 | $1,586,038.78 | -5.6% | → |