NEW YORK--(BUSINESS WIRE)--Fitch Ratings has today upgraded the following ratings for Stifel Financial Corporation (Stifel): --Viability Rating (VR) to 'bbb' from 'bbb-'; --Long- and short-term Issuer Default Ratings (IDR) to 'BBB/F2' from 'BBB-/F3'; --Senior unsecured debt rating to 'BBB' from 'BBB-'. The Rating Outlook is Stable. A full list of rating actions follows at the end of this release. KEY RATING DRIVERS VR and IDRS The upgrades to Stifel's IDRs, Viability Rating and senior unsecured