Monday's Financial Winners & Losers

BP Prudhoe Bay Royalty Trust(BPT Quote) tumbled on news that BP(BP Quote) said it was shutting down its Prudhoe Bay oil field in Alaska due to a corroded pipeline and a small leak. BP Prudhoe Bay Royalty Trust is an investment trust that holds overriding royalty interests in minerals in Prudhoe Bay. Shares fell $11.52, or 13.11%, to $76.37.

Aon(AOC Quote) gained as analysts split on their ratings for the Chicago-based insurance broker. Lehman Brothers(LEH Quote) downgraded Aon's stock to equal-weight from overweight, while Citigroup(C Quote) upgraded Aon to buy from hold. Shares gained 38 cents, or 1.19%, to $32.27.

Safety Insurance Group(SAFT Quote) gained after the Boston-based insurer reported a 25% increase in second-quarter earnings. The company earned $29.1 million, or $1.81 a share, up from $23.2 million, or $1.46 a share a year ago. Revenue totaled $169.6 million, up from $168.1 million a year ago. Wall Street was looking for earnings of $1.32 a share. Total expenses dropped to $126.4 million, down from the year-ago figure of $134 million. The stock added $1.02, or 1.86%, to $56. ...