The DTCC stopped trading after learning from the SEC that there were questions about the validity of shares held in Cede and Co. once they are notified they stop clearing and settling trades because they can not guarantee that what they are clearing and settling with is a valid share.
It is the responsibility of the company and the SEC to resolve the discrepancy in shares held at the DTCC. until that is done there is nothing the DTCC can do. They all look the same and have traded many times over making it impossible to decide what account holds what (real vs. forged)
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