GANGNAM-GU SEOUL, Korea, Republic Of (AP) — GANGNAM-GU SEOUL, Korea, Republic Of (AP) — POSCO Holdings Inc. (PKX) on Monday reported profit of $170.9 million in its third quarter. The Gangnam-Gu seoul, Korea, Republic Of-based company said it had profit of 56 cents per share. The steelmaker posted revenue of $13.51 billion in the period....