A notable absence is Dubai Ports World, another big global port operator, which is heavily involved in operating container terminals in India, the main catchment area for Colombo's transhipment cargo.
A pre-bid meeting of prospective bidders was held in mid-March where some of the investors sought clarification on the 25 million up front premium bidders have to pay.
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Construction work on the breakwater and dredging of the new harbour basin is already under way.
Bids will be opened by the Cabinet appointed negotiating committee on behalf of the Sri Lanka Ports Authority on May 19.
The parties include Maersk, the world's biggest shipping line, APL, another global shipping line, and Hutchison Port Holdings (HPH), a big global port terminal operator based in Hong Kong.
Others were Gulftainer, a port operator based in Sharjah in the UAE, South Asia Gateway Terminals, which operates Colombo's private container terminal, and China Harbour Engineering Company, which is building a port