Norton Rose Fulbright has acquired four-lawyer commercial law boutique Keller Snyman Schelhase (KSS) in Cape Town, a move that comes six years after the global legal giant launched in South Africa via a merger with one of the country's largest firms.

KSS partners Andrea Keller, Anton Schelhase and Lauren Fine are joining the firm's South African partnership as directors. The Cape Town firm, which was formed in 2012, advises clients in the energy, infrastructure, real estate, retail, transportation and financial services sectors.

"Our strong market in the Cape, together with Norton Rose Fulbright's established global position, means that we can provide unrivalled legal services in the region," said a statement by Schelhase. Norton Rose Fulbright's South Africa managing director Donald Dinnie noted that the addition of KSS will bolster the firm's energy and infrastructure capabilities.

Dinnie joined Norton Rose Fulbright in 2010 from Deneys Reitz, where he headed the disputes practice at the top South African firm, which was absorbed into the Swiss verein structure of what was then known as Norton Rose. The firm subsequently acquired Montreal's Ogilvy Renault, Calgary-based Macleod Dixon and US firm Fulbright & Jaworski – and Norton Rose Fulbright's appetite for expansion has continued.

On 1 January, the firm finalised its combination with Vancouver-based Bull Housser & Tupper, just after it opened an outpost in Port Moresby, Papua New Guinea, and announced plans to open another office in Monaco for its shipping practice in 2017.

Norton Rose Fulbright also struck an alliance with Kenya's Walter Kontos in July, the firm's latest outreach in Africa, where it already has relationships with Burundi's Shonubi Musoke Gilbert & Partners, Uganda's Shonubi Musoke & Co Advocates and Zimbabwe's Gill Godlonton & Gerrans.

However, earlier this month the firm closed its Pittsburgh office, with two partners leaving to join Blank Rome.