You don't know how this will end for shareholders, If the company survives, they could become current and successful under new management, especially if their Covid tests are viable and "close to 100% in specificity and sensitivity." If Mark is convicted, there may be funds somewhere to be disgorged and distributed to shareholders. There may be funds available from the two who have already pleaded guilty as well. The worst that could happen is that everything goes bust, which would be sad but somewhat OK for reporting any losses to the IRS to reduce taxable income.
Only time will tell.
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