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Approximation of equity value for company in default 
Generally "default" means that the company cannot pay off their debts, and since debt holders get paid before equity holders, their equity would be effectively worthless. That said, companies can emerge from Chapter 11 bankruptcy (reorganization) and retain equity value, but it is rare. Most times, stocks are de-listed or frozen on stock exchanges, and company's reorganization plan will cancel all existing equity shares, instead focusing all of their attention on paying back as much debt as possible. If the company issues new equity after reorganizing, it might provide a way for holders of the original equity to exchange their shares for the new equity, but it is rare, and the value is usually significantly less that the value of the original equity.