No, in my experience, as long as you held stock when the fraud occurred you are covered.
If you want to read the way another case is worded, here's a post of mine from whaiq. Circumstances are sort of similar with the CEO being investigated for fraud. This was a real company with real revenues (though grossly overstated) and hundreds of employees. You'll have to check what the stock was trading for on the days the lawsuit covers but if memory serves me it was somewhere between $2 - $4. Shareholders can expect approx. .07 for each share through this lawsuit. (Also I had to correct dates from this post so the "reply" has the right dates.)
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