Gupta was speaking as his firm completed the acquisition of former Tata Steel plate making facilities at Dalzell and Clydebridge in Lanarkshire, Scotland, on Thursday.
The deal involved a back-to-back transaction in which the Scottish government acquired the two plants from Tata Steel and immediately sold them to Liberty House.
The agreement to save the two plants was completed on March 24 and in coming months Liberty expects to create around 150 new jobs to get the plants up and running again.
"We're very pleased to announce that we have completed the deal to acquire Tata's plate mills in Scotland and we now look forward to continuing to work with local management and the workforce to re-build these great businesses in the months ahead," he said.
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Scotland's First Minister, Nicola Sturgeon, said the government was "grateful to Liberty" to take up this "exciting opportunity in Scotland and for the energetic and speedy manner in which they worked with the Scottish government to help save these jobs."
Wales-based Gupta's family firm Liberty House and a possible management buyout are so far the publicly declared partieskeen on acquiring Tata Steel's Port Talbot steelworks in Wales, which went up for sale last month after the Indian giant announced plans to exit the UK market.
Gupta, a Punjab-born graduate from Cambridge University, is being dubbed UK's new "man of steel" after he emerged as a potential saviour of jobs if he were to acquire Tata Steel's Welsh units, which went up for sale last month.