Pakistan's flamboyant cricketer-turned-politician Imran Khan's Pakistan Tehreek-e-Insaf was leading on 110 seats, while its main rival Pakistan Muslim League-Nawaz was way behind with 67 seats as trends indicated a possible hung parliament.
The election was marred by a deadly suicide attack and allegations of manipulation by the powerful military, with several parties raising objections over the entire process.
The Pakistan Peoples Party (PPP) of former president Asif Ali Zardari was leading on 41 seats, indicating he could be the kingmaker in case of a hung parliament.
According to the latest trends available for 268 of the National Assembly's 272 seats, independents were leading on 18 seats. Polling was postponed on two constituencies following the deaths of candidates in terror attacks.
PML-N president Shahbaz Sharif has outrightly rejected the election results, alleging "blatant" rigging.
Sharif hinted his party would launch protests against the alleged rigging of polls.
"Some five other parties including PPP have raised the rigging issue in polls. After consulting them, I will announce the future course of action. Pakistan has suffered today," he told journalists at a press conference.
"We will fight this injustice and use all options."
According to Election Commision of Pakistan website, the first Form 45 is the Result of the Count' showing the number of valid votes for each contesting candidate and ballot papers excluded from the count