THE CORPORATE LIBRARY

Related Party Transactions and Outside Related Director Information

Northern Trust Corporation (NTRS)

3/13/2006 Proxy Information

Directors and executive officers of the Corporation, as well as members of their immediate families and various corporations and other entities associated with the directors, were clients of and had transactions with the Corporation and its subsidiaries in the ordinary course of business during 2005. These transactions included loans; purchases, sales and placements of investment securities and other financial instruments; fiduciary transactions; deposits; and other purchase, sale and finance transactions. Similar transactions may occur in the ordinary course of business in the future. All loans were made on a non-preferential basis and did not involve more than the normal risk of collectibility or present other unfavorable terms. All loans made to directors and executive officers of the Corporation are permitted under the provisions of the Sarbanes-Oxley Act of 2002. Transactions in 2005 involving services provided by the Corporation to its directors and executive officers did not result in payments or fees that were material to the gross revenues of the Corporation.

In the ordinary course of business, the Corporation uses the products and services of organizations of which the CorporationÕs directors are directors or executive officers. Transactions in 2005 involving the purchase of products and services did not result in payments that were material to the gross revenues of the organization with which a director was associated. Mr. Helman, a director of the Corporation who will retire at the 2006 annual meeting of stockholders, is a partner in the law firm of Mayer, Brown, Rowe & Maw, which renders legal services to the Corporation and its subsidiaries.

3/14/2005 Proxy Information

Mr. Helman, a director of the Corporation, is a partner in the law firm of Mayer, Brown, Rowe & Maw, which renders legal services to the Corporation and its subsidiaries.

3/15/2004 Proxy Information

Robert A. Helman, a director of the Corporation, is a partner in the law firm of Mayer, Brown, Rowe & Maw, which renders legal services to the Corporation and its subsidiaries.

Directors and executive officers of the Corporation, as well as members of their immediate families and various corporations and other entities associated with the directors, were clients of and had transactions with the Corporation and its subsidiaries in the ordinary course of business during 2003. These transactions included loans; purchases, sales and placements of investment securities and other financial instruments; fiduciary transactions; deposits; and other purchase, sale and finance transactions. Similar transactions may occur in the ordinary course of business in the future. All loans were made on a non-preferential basis and did not involve more than the normal risk of collectibility or present other unfavorable terms. All loans made to directors and executive officers of the Corporation are permitted under the provisions of the Sarbanes-Oxley Act of 2002. Transactions in 2003 involving services provided by the Corporation to its directors and executive officers did not result in payments or fees that were material to the gross revenues of the Corporation.

In the ordinary course of business, the Corporation uses the products and services of organizations of which the CorporationÕs directors are directors or executive officers. Transactions in 2003 involving the purchase of products and services did not result in payments that were material to the gross revenues of the organization with which a director was associated. Mr. Helman, a director of the Corporation, is a partner in the law firm of Mayer, Brown, Rowe & Maw, which renders legal services to the Corporation and its subsidiaries.

3/10/2003 Proxy Information

In the ordinary course of business, the Corporation uses the products and services of organizations of which the CorporationÕs directors are directors or executive officers. Transactions in 2002 involving the purchase of products and services did not result in payments that were material to the gross revenues of the organization with which a director was associated. Mr. Helman, a director of the Corporation, is a partner in the law firm of Mayer, Brown, Rowe & Maw, which renders legal services to the Corporation and its subsidiaries.

Directors and executive officers of the Corporation, as well as members of their immediate families and various corporations and other entities associated with the directors, were clients of and had transactions with the Corporation and its subsidiaries in the ordinary course of business during 2002. These transactions included loans; purchases, sales and placements of investment securities and other financial instruments; fiduciary transactions; deposits; and other purchase, sale and finance transactions. Similar transactions may occur in the ordinary course of business in the future. All loans were made on a non-preferential basis and did not involve more than the normal risk of collectibility or present other unfavorable terms. All loans made to directors and executive officers of the Corporation are permitted under the provisions of the Sarbanes-Oxley Act of 2002. Transactions in 2002 involving services provided by the Corporation to its directors and executive officers did not result in payments or fees that were material to the gross revenues of the Corporation.