Weekly Market Summary: Strong Downward Momentum, Especially Large Caps

 | Aug 23, 2015 02:27AM ET

Summary: Strong downward momentum usually has follow through. US indices are mostly within a few percent of significant support levels. The selling this past week registered noteworthy extremes in breadth, volatility and sentiment. Friday probably will not mark the low, but risk/reward over the next month looks favorable.

For the week, SPDR S&P 500 (NYSE:SPY) and SPDR Dow Jones Industrial Average (NYSE:DIA) dropped 5.6%, NDX 7.4% and RUT 4.6%. For SPY, it was the biggest weekly decline since August/September 2011 and May 2010.

These numbers tell you that the decline this past week was primarily about large cap stocks. Not only did small cap stocks outperform but small companies within SPY outperformed larger ones.

Investors will come up with any number of reasons for the sell off. To us, the most important aspect is this: 80% of the selling over the past two weeks has taken place overnight. In fact, before Friday, cash hours showed a gain over the prior 8 trading days. SPY has lost $9.30 overnight since August 10. That date corresponds to the decision by the PBoC to allow the yuan to depreciate, which set off a cascading effect in other currencies.

There have been few earnings catalysts during this selloff, as most companies have finished reporting 2Q results. Macro data has also been light and positive: housing starts rose to a new 8 year high and retail sales recovered to post a 2.3% annual gain in real terms in July.

The FOMC, meanwhile, remains divided on whether to raise rates in September. The probability of such a hike fell this past week, but it is still higher than it has been for any other month in the past.

That the main catalyst for the selloff was events outside the US suggests that the selling is more likely to be relatively short-lived and contained.

Let's look at an example. At its worst, the 1997 Asian financial crisis, which involved currencies throughout the region losing 50% of their value and large loan packages from the World Bank and IMF, resulted in SPX losing only about 5% over two weeks in August. SPX remained in choppy turmoil the remainder of August, then rose 8% in September. The crisis spread over the coming months, but the downside never expanded and the overall trend in SPX was higher.