The PSX-100 index gained a record 1203 points and crossed the 69,000 benchmark to reach 69620 points at the closing time on the first day of the trading week ahead of the Eid-ul-Fitr holidays.
Experts said progress in PIA privatization along with a likely decrease in interest rates.
Last week, Pakistan's benchmark stock index hit all-time intraday and closing highs on Thursday, extending a rally following a staff-level agreement with the International Monetary Fund earlier this month to free up more financial aid for the country.
The benchmark KSE-100 (.KSE), opens new tab touched a record high of 67,246.02 points in intraday trade, surpassing its previous high of 67,093.96 touched on Dec. 13, before settling at 67,142.12 - a record closing high.
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"Foreign and local institutions buying amid positive news on privatization and IMF," Topline Securities' Mohammed Sohail said.
Overall, the index rose 594.34 points on Thursday, up 0.89% from the previous day's close.
Pakistan and the IMF reached a staff-level agreement on the second and last review of a nine-month, $3 billion Stand-By Arrangement, which, if cleared by the global lender's board, will release about $1.1 billion to the struggling South Asian nation.
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Both sides have also spoken about negotiating a longer-term bailout and continuing with necessary policy reforms to rein in deficits, build reserves and manage soaring debt servicing.
Pakistan's new government, led by Prime Minister Shehbaz Sharif, has also resolved to follow through with a long delayed privatisation process of loss-making state-owned enterprises that have drained critical funds from the cash-strapped government.