The Pakistan Stock Exchange (PSX) closed almost unchanged on Thursday as late profit-taking wiped out an early rally, leaving the KSE-100 index down almost 50 points. The benchmark index surged as much as 1,279 points to the intra-day high of 178,650 amid falling oil prices and hopes of progress in US-Iran talks. Selling then set in after a batch of corporate results, dragging the index to the