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I would not be surprised if many trading places have been told to shut down temporarily. [1] https://www.ccn.com/dow-crashes-so-hard-might-close-stock-market/

• IAmEveryone 7y ago
  That’s about a set of specific, known “circuit-breakers”. They shut down trading at the actual exchange, not “ask trading places“ to do so.
• manigandham 7y ago
  The market makers and exchanges stop executing orders because a series of circuit-breakers fired (set by the regulating organizations). Robinhood and other brokers don't execute any trades, they just forward orders from users to their exchange partners and show up to date quotes. They have a much easier load to bear than actual exchanges.