Commodities trading giant Glencore has priced its public offering at between 480p and 580p per share, giving it a mid-point valuation of $60bn (£36bn).
The flotation will be London’s largest and make paper billionaires of some Glencore executives.
Details of key investors planning to take stakes in Glencore were due to be released on Wednesday.
Glencore, the world’s largest commodities trader, has been a private firm since its creation 37 years ago.
Last month, Glencore announced the appointment of Simon Murray as chairman.
This followed widespread speculation that former BP boss Lord Browne had pulled out of the job at the eleventh hour.
Glencore employs about 57,500 people across more than 40 countries, and had net income of $3.8bn on revenues of $145bn last year.
It trades metals and minerals, as well as energy and agricultural products, and has benefited from the recent growth in demand for commodities, especially from China.
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Glencore unveils flotation price