MARSH & MCLENNAN COS INC — institutional ownership

4 funds reported holding MARSH & MCLENNAN COS INC in their latest 13F filings, worth $17.1M in total (CUSIP 571748902).

Largest holders

1. IMC-Chicago, LLC — $12.0M
2. SIMPLEX TRADING, LLC — $2.48M
3. HRT FINANCIAL LP — $2.27M
4. GROUP ONE TRADING LLC — $350K