NEW YORK–(BUSINESS WIRE)–Fitch Ratings has taken the following rating actions: SLM Student Loan Trust 2006-4 (SLM 2006-4): –Class A-5 affirmed at ‘AAAsf’; Outlook Stable; –Class A-6 affirmed at ‘AAAsf’; removed from Rating Watch Negative and assigned Outlook Stable; –Class B affirmed at ‘Asf’; Outlook Stable. KEY RATING DRIVERS U.S. Sovereign Risk: The trust collateral comprises 100% Federal Family Education Loan Program (FFELP) loans, with guaranties provided by eligible guarantors and re
