10 things you need to know today (SPY, SPX, QQQ, DIA, AAPL)

Here is what you need to know.
Bitcoin plunges on fears South Korea will shut exchanges. The cryptocurrency trades down more than 10% near $13,800 a coin after the South Korean government warned it may close some cryptocurrency exchanges amid "irrationally overheated" trading.
Bitcoin is losing its dominance over crypto. The digital coin commanded nearly 90% of the crypto market at the beginning of 2017, but that number hit a low of 42% on Monday, according to data from CoinMarketCap.com.
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