Pakistan, July 22 -- Pakistan Stock Exchange (PSX) opened Wednesday's trading session in negative territory as selling pressure in key sectors pushed the benchmark KSE-100 Index down by more than 400 points during early trading.

Read More: PSX posts modest gains, adds over 205 points

By 10:28am, the KSE-100 Index had fallen 419.87 points, or 0.24%, to 175,713.69 points, reversing the modest gains recorded in the previous session. Investors remained cautious amid uncertainty surrounding regional geopolitical developments and mixed global market signals.

Selling activity was concentrated in major sectors, including automobile assemblers, cement, fertilizer, oil marketing companies and power generation firms. Several heavyweight stocks th...