The S&P 500 and the Nasdaq turn in their worst weeks since March with tech giant Apple weighing heavily, while non-farm payrolls miss expectations with a gain of 187,000 jobs in July. Siemens Energy cuts its revenue outlook and posts a third quarter net loss of almost €3 billion, with the German group warning of further serious challenges at its wind unit Gamesa. And Berkshire Hathaway’s cash pile jumps to nearly $150 billion as Warren Buffett's conglomerate posts a near 7% rise in operating earnings.

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