As reflected in the table below, the risk-based capital ratios of Northern Trust and its principal subsidiary bank, The Northern Trust Company, remained strong at December 31, 2012, with all ratios exceeding the regulatory requirements for classification as a “well capitalized” institution established by U.S. banking regulators of 6%, 10%, and 5%, respectively.

             
    December 31, 2012   September 30, 2012   December 31, 2011
  Tier 1   Total   Leverage   Tier 1   Total   Leverage   Tier 1   Total   Leverage
    Capital   Capital   Ratio   Capital   Capital   Ratio   Capital   Capital   Ratio
Northern Trust Corporation 12.8% 14.3% 8.2% 12.8% 14.3% 8.1% 12.5% 14.2% 7.3%
The Northern Trust Company   11.9%   13.7%   7.6%   11.8%   13.8%   7.5%   11.7%   13.8%   6.8%
 

The following table provides the Corporation’s ratios of tier 1 capital and tier 1 common equity to risk-weighted assets, as well as a reconciliation of tier 1 capital calculated in accordance with applicable regulatory requirements and GAAP to tier 1 common equity.
             
  December 31,   September 30,   December 31,
($ In Millions)   2012   2012   2011
 
Ratios
Tier 1 Capital 12.8 % 12.8 % 12.5 %
Tier 1 Common Equity 12.4 % 12.3 % 12.1 %
 
Tier 1 Capital $ 7,489.0 $ 7,425.5 $ 7,104.6
Less: Floating Rate Capital Securities     268.7       268.7       268.6  
Tier 1 Common Equity   $ 7,220.3     $ 7,156.8     $ 6,836.0  
 

Northern Trust is providing the tier 1 common equity ratio, a non-GAAP financial measure, in addition to its capital ratios prepared in accordance with regulatory requirements and GAAP as it is a measure that Northern Trust and investors use to assess capital adequacy.

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