Fitch has upgraded IIB's ST rating as a result of the application of its updated ST Rating Criteria. Under the revised criteria IIB's 'BBB+' Long-Term (LT) IDR is on a new cusp point. Fitch has applied the higher of the two options mapping to the 'BBB+' LT IDR, as IIB's liquidity assessment of 'aa-' is higher than 'a', the minimum liquidity assessment at which the higher option would apply at the 'BBB+' cusp point.

Fitch Ratings press release can be found here