Among the earnings stories for Friday, Nov. 6, from AP Financial News:

Top stories:

OMAHA, Neb. (AP) -- Warren Buffett's company says its third-quarter profit tripled as the improving economy and stock market boosted the value of Berkshire Hathaway Inc.'s derivative contracts.

Other stories:

HOUSTON (AP) -- Rosetta Resources Inc. said its revenue fell by nearly half due to lower natural gas prices.

GREAT NECK, N.Y. (AP) -- One Liberty Properties Inc. said its third-quarter funds from operations rose 22 percent as rental income increased.

YORK, Pa. (AP) -- York Water Co., which purifies and distributes water, said a higher number of customers plus a rate increase lifted its third-quarter profit by 20 percent.

NEW YORK (AP) -- Brookfield Asset Management Inc. said its third-quarter profit fell 35 percent, as revenue declined, expenses rose and the company booked a charge of more than $192 million as the value of assets declined amid the weak economy.

ATLANTA (AP) -- Mirant Corp. posted a 97 percent plunge in its third-quarter profit -- driven mainly by one-time hedging losses -- and lowered its 2009 adjusted earnings before interest, taxes, depreciation and amortization.