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AON vs MRSH stock comparison

Compare Aon plc Class A Ordinary Shares (Ireland) (AON) vs Marsh Common Stock (MRSH) with a normalized 1-year performance chart. AON -5.3% versus MRSH +1.9%.

AON return
-5.3%
MRSH return
+1.9%
Spread
-7.2%
Data window
Jan 2026 to Sep 2026

Normalized performance chart

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AON versus MRSH comparison chart

Company pair

AON

Aon plc Class A Ordinary Shares (Ireland)

MRSH

Marsh Common Stock

Data notes

  • 85 dates were skipped because one series was missing or non-positive.