From the Form 4 Instructions: "This Form must be filed before the end of the second business day following the day on which a transaction resulting in a change in beneficial ownership."
"A reporting person no longer subject to Section 16 of the Securities Exchange Act of 1934 (“Exchange Act”) must check the exit box appearing on this Form."
If Pike sold down to below 10% he would still have to file the transaction(s) that got him there.
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