Was Monday's ETF Collapse Just A Warmup? By: TalkMarkets August 26, 2015 at 17:25 PM EDT The ETF can’t be more liquid than the underlying, and we know the underlying can become highly illiquid. Read More >> Related Stocks: BlackRock Chipotle Mexican Grill ConAgra Foods Lockheed Martin McDonald's Corp Philip Morris International Select Dividend Ishares ETF