(Bloomberg) — Aon Plc, the world'ssecond-largest insurance broker by market value, fell themost since February after revenue missed estimates as reinsurancesales declined.

Aon slipped 4.2% to $87.14 at 9:40 a.m. in New York, the biggestdecline in the 84-company Standard & Poor's 500 FinancialsIndex.

Revenue was $2.92 billion, compared with analysts' estimates of$2.96 billion in a survey by Bloomberg. Reinsurance commissions andfees fell 4.3 percent to $360 million, the London-based broker saidtoday in a statement.

The reinsurance slump was “the key negative in the quarter,”Meyer Shields, a Keefe Bruyette & Woods analyst said in aninvestor note today. The decrease probably “reflects rate declinesand shrinking demand.”

Net income was $304 million, or $1.01 a share, compared with$241 million, or 76 cents a share a year earlier.

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