Last rites for Si­en­na, as strug­gling biotech files for Chap­ter 11

More than three years af­ter mak­ing a $65 mil­lion dol­lar pub­lic de­but, Si­en­na Bio­phar­ma­ceu­ti­cals has filed for bank­rupt­cy.

The com­pa­ny’s shares $SNNA — which once …

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