Morgan Stanley has been appointed to effect the plan, with the share sales starting from 21 August — the end of a three-month lock up period that followed a share sale in May.
Up to 15 per cent of the aggregate total trading volume in the bank’s shares will be sold over the duration of the plan.
UK Government Investments (UKGI), the entity overseeing the Treasury’s stake in NatWest, said: “Shares may not be sold under the plan below a price per share that UKGI and Treasury determine represents fair value and delivers value for money for the taxpayer.”
The Financial Times reported that the bank’s current share price remains 60 per cent lower than the average price paid by government to bail it out.
The government spent £46bn rescuing NatWest, formerly Royal Bank of Scotland, when it became caught up in the financial crisis of 2009.
UKGI still owns 54.7 per cent of NatWest’s shares.