US securitiesexchangecommission rules oblige companies to make a listing once they passed this threshold.
美国证券交易委员会发行了规定，这迫使公司一旦通过这道门槛就必须上市。
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"There seems to be a predominance of short-term thinking at the expense of long-term investing," said Commissioner Daniel Gallagher of the US Securities and ExchangeCommission in a speech this week.