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Because of so large income - you would be required to file.
Whether you will have any tax liability depends on your basis.
The basis for inherited assets is so called stepped basis equals to the fair market value of stocks when the decedent passed away.
So your taxable gain is (selling price) MINUS (basis)
Thus if shares are sold shortly after they were inherited - most likely - there would not be any gain.
But filing and reporting is required.