Take a look at funds that track the MSCI Minimum Volatility Emerging Markets Index. On Friday a constituent stock fell 85%--in one hour, about as volatile as you can get. China Huishan Dairy, which had a weighting of around 0.7% in the index before the crash, lost more than $4 billion in market value. Since the company is in other MSCI indices, there are many funds that hold the stock. BlackRock, for example, owns around 1.3% of the company, according to FactSet.
The company halted trading in its shares just after the plunge. But there were hints all along (https://www.wsj.com/ articles/no-more-milk-in-this-chinese-cow-company-1453432660)this low-vol play was anything but.
One worry sign was the quarter of the company's shares pledged by its largest shareholder and chairman, Yang Kai, to a bank in return for a loan in December. When a bank fears that it may not recover the full value of share loan, it may choose to dump the shares in the market, as happened with other Hong Kong stock plungers (http://blogs.wsj.com/ moneybeat/2016/07/28/curious-case-of-hong-kongs-tandem-stock-plungers/), notably, Tech Pro Technology(3823.HK) and Hanergy Thin Film Power. Huishan itself has also racked up mounds of debt, including by using its cows as collateral.
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