The JSE opened in the red on Friday as a bout of profit taking hit resources and banking stocks, while a weaker global backdrop did not help sentiment.
By 09:19 local time the JSE all share index had lost 0.58%, with banks heading south by 1.09% and financials by 0.68%.
Resources were off by 0.84%, with platinum counters down 0.10% and golds up 0.04%. Industrials were down by 0.30%. Gold was quoted at $1,168.83/oz from $1,162.70/oz at the JSE's previous close, while platinum was at $1,554.50/oz from $1,558/oz before.
A local dealer said the lower opening was due to profit taking, mainly on resources and banks.
Dow Jones Newswires reports that U.S. stock futures are lower Friday, after markets turned lower on Thursday.
Asian stock markets are lower, with government bonds higher, while investors shift into safe mode ahead of the pivotal U.S. GDP data later that could shed light on an expected U.S. slowdown.
European stock markets, while garnering some support from regional improvement, may start lower on U.S. concerns.