 NEW YORK--BUSINESS WIRE--Ambac Financial Group, Inc. NYSE: AMBC Ambac, a financial services holding company, today announced that its newly formed special purpose entity, Sitka Holdings, LLC Sitka or the Issuer, has launched a private offering, to eligible purchasers, of senior secured notes due 2026 the Sitka Senior Secured Notes. The Sitka Senior Secured Notes will be secured by all assets of Sitka, which include a secured note issued by Ambac Assurance Corporation AAC 