STAMFORD, Conn. (AP) ¿ PrimeEnergy Corp. on Friday moved to a loss in the third quarter as oil and gas prices fell, dragging results down. The company, based in Stamford, Conn., lost $2.3 million, or 76 cents per share, in the quarter that ended Sept. 30. That is compared with a profit of $2.1 million, or 54 cents per share, a year earlier. Revenue fell 45 percent to $23.3 million from $42.4 million. The oil and gas company said gas revenue dropped 62 percent to $7.3 million from $19.5 million. It shares closed unchanged Friday at $33.73.