"The majority of work places are still 'lilly white' at the top and often male over-represented, with a few pockets of black and women executives," Labour Minister Mildred Oliphant commented on the findings by a special commission in her ministry.
Overall, blacks represent around 75 per cent of South Africa's economically active population, compared to just under 11 per cent of whites.
Yet almost two-thirds of senior roles in Africa's second-largest economy were held by whites last year, according to the study, compared to 19.8 per cent of black people.
Foreign nationals filled up the remaining 4.1 per cent.
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The disparity at the top of South Africa's corporate ladder exists despite employment equity legislation to address the legacy of racial exclusion in the labour market created by apartheid.
The ANC government, which has ruled South Africa since the first post-apartheid elections in 1994, has been criticised for not doing enough to address poverty.
Meantime in a separate report, the statistics office pointed to "large disparities" in average earnings between racial groups in a country rated one of the most unequal societies in the world.
"At 2,600 rand in 2013, the earnings of black Africans amounted to barely 25 per cent of white earnings," said the statistics office.
The labour market figures come just a month ahead of elections that promise to be the toughest ever faced by the ruling African National Congress.
A key issue is the job market: out of a working age population of 35 million, only around 15 million South Africans are actually employed.
"Employment in the formal sector increased from 10.1 million in 2008 to 10.5 million in 2013," Statistics South Africa said in a statement.