Eoin Treacy's view I opened a short in the S&P 500 early this afternoon selling a September contract at 1336 including spread-bet dealing costs. The S&P500 has been a clear outperformer for much of the year to date but is currently in a process of mean reversion and broke downwards from the short-term range today. A clear upward dynamic will be required to question potential for some additional downside.