Chevron is trading 9.43% down at $2.02; no verified report directly explains the move. - Reports say Chevron curtailed Gulf offshore operations as Tropical Storm Isaias approached, while oil prices fell Friday as Middle East supply concerns eased; neither establishes the cause. - Supplied sector context shows energy stocks higher, so it does not explain the decline. Available sources do not verify this live move; the price and percentage are used as supplied.