Company:  NORTHERN TRUST CORP (NTRS)
Form Type:  10-K
Filing Date:  2/24/2012 
CIK:  0000073124 
Address:  50 S LASALLE ST 
City, State, Zip:  CHICAGO, Illinois 60603 
Telephone:  (312) 630-6000 
Fiscal Year:  12/31 
Last Trade
Last Trade: 
$58.27  
Change: 
1.09 (1.91%)  
Trade Time: 
May 17  
Market Cap: 
$13.94B
Description of Business
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  FORM 10-K
    PART I
      Item 1-Business
        INCOME STATEMENT
        BALANCE SHEET
        INCOME STATEMENT
        NAME AND TITLE
      Item 1A-Risk Factors
      Item 1B-Unresolved Staff Comments
      Item 2-Properties
      Item 3-Legal Proceedings
    PART II
      Item 5-Market for Registrant's Common Equity, Related ...
      Item 6-Selected Financial Data
      Item 7-Management's Discussion and Analysis of Financial ...
      Item 7A- Quantitative and Qualitative Disclosures About ...
      Item 8-Financial Statements and Supplementary Data
      Item 9-Changes in and Disagreements with Accountants on ...
      Item 9A-Controls and Procedures
      Item 9B-Other Information
    PART III
      Item 10-Directors, Executive Officers and Corporate Governance
      Item 11-Executive Compensation
      Item 12-Security Ownership of Certain Beneficial Owners and ...
      Item 13-Certain Relationships and Related Transactions, and ...
      Item 14-Principal Accountant Fees and Services
    PART IV
      Item 15-Exhibits and Financial Statement Schedules
    SIGNATURES
    EXHIBIT INDEX
  EXHIBIT 10.7.(XIX)
  EXHIBIT 10.7.(XX)
  EXHIBIT 10.7.(XXI)
  EXHIBIT 10.7.(XXII)
  EXHIBIT 10.7.(XXIII)
  EXHIBIT 10.7.(XXIV)
  EXHIBIT 10.7.(XXV)
  EXHIBIT 10.19
  EXHIBIT 13
    INCOME STATEMENT
    INCOME STATEMENT
    BALANCE SHEET
    REPORT OF INDEPENDENTREGISTERED PUBLIC ACCOUNTING FIRM
      BALANCE SHEET
      INCOME STATEMENT
      STOCKHOLDERS EQUITY
      CASH FLOW
    NOTES TO CONSOLIDATED FINANCIALSTATEMENTS
    REPORT OF INDEPENDENTREGISTERED PUBLIC ACCOUNTING FIRM
      INCOME STATEMENT
      INCOME STATEMENT
  EXHIBIT 21
    SUBSIDIARIES
  EXHIBIT 23
    Consent of Independent Registered Public Accounting Firm
  EXHIBIT 24
    POWER OF ATTORNEY
  EXHIBIT 31.(I)
    Certification of CEO Pursuant to
  EXHIBIT 31.(II)
    Certification of CFO Pursuant to
  EXHIBIT 32
    Certifications of CEO and CFO Pursuant to