It depends on the market where the stock trades. Different rules apply in different markets.
For stocks that trade in the OTC or the over-the-counter market, trading does not automatically resume when a suspension ends. (The OTC market includes the Bulletin Board and the Pink Sheets.) Before trading can resume for OTC stocks, SEC regulations require a broker-dealer to review information about a company before publishing a quote. If a broker-dealer does not have confidence that a company's financial statements are current and accurate, especially in light of the questions raised by the SEC, then a broker-dealer may not publish a quote for the company's stock.
In contrast to OTC stocks, stocks that trade on an exchange or Nasdaq resume trading as soon as an SEC suspension ends.