KARACHI, Nov 4: The stock market on Monday plunged by 4 per cent or 90.70 points on heavy selling in most of the pivotals triggered by the surging political uncertainty about the formation of government at the Centre and higher badla volume.

The state-run PSO led the fall, which declined by Rs10.15 at Rs193.10 on a massive volume of 15 million shares, followed by ICI Pakistan, Engro Chemical and Fauji Fertilizer, which also received heavy battering at their recent highs.