The government is offering 323m ordinary shares and global depositary shares (GDS), each representing 10 ordinary shares, according to a term sheet seen by Reuters on Tuesday. The GDSs will trade in London.

The deal is part of an initiative announced earlier this year to privatise 68 companies, including 10 banks, and raise $5 billion in the next two years, officials have previously said.

Pakistan raised $387m from a share sale in United Bank Ltd in June and another $146m from a sell-down in Pakistan Petroleum Ltd the same month.

Upcoming deals include an up to $1.2bn offering in Pakistan’s largest lender HBL Bank, Thomson Reuters publication IFR reported in June, citing comments from Mohammad Zubair, the country’s minister of state for privatisation.

OGDCL’s sell-down would be the biggest offering from a Pakistan-based company since the government sold $913.6m worth of GDSs in the oil exploration company in London in late 2006, Thomson Reuters data showed.

OGDCL shares are down 6.5 per cent so far in 2014, compared with a 21pc slump in the benchmark 100-share index of the Karachi Stock Exchange.

The OGDCL deal represents 7.5pc of the company’s share capital and will increase its free float company to 22.5pc, the term sheet showed. Pricing for the offering is slated for Oct. 16, with trading of the GDSs in London set for Oct. 21.

Bank of America Merrill Lynch, Citigroup, and Pakistani broker KASB Securities are handling the share sale.

Pakistan plans to sell dozens of public companies to help stabilise a $225bn economy crippled by power shortages, corruption and militant violence.

Anti-government protests that have gripped Islamabad since mid-August are also threatening economic reforms that the government promised in return for a bailout from the International Monetary Fund, officials have said.