Results of Operations and Financial Condition The information contained in the registrant’s October 21, 2026 press release, reporting on the registrant’s earnings for the three and nine months ended September 30, 2026, a copy of which is attached as Exhibit 99.1 hereto, is incorporated herein by reference.

Director — Rima Qureshi: The filing discloses the appointment of a new director to the board and its committees, which is a standard governance event and not an executive departure.

CFO — David W. Fox, Jr.: The CFO announced a planned retirement with a search for a successor, representing an orderly succession rather than a sudden loss.

Results of Operations and Financial Condition The information contained in the registrant’s July 22, 2026 press release, reporting on the registrant’s earnings for the three and six months ended June 30, 2026, a copy of which is attached as Exhibit 99.1 hereto, is incorporated herein by reference.

Results of Operations and Financial Condition The information contained in the registrant’s April 21, 2026 press release, reporting on the registrant’s earnings for the three months ended March 31, 2026, a copy of which is attached as Exhibit 99.1 hereto, is incorporated herein by reference.

Results of Operations and Financial Condition The information contained in the registrant’s January 22, 2026 press release, reporting on the registrant’s earnings for the three and twelve months ended December 31, 2025, a copy of which is attached as Exhibit 99.1 hereto, is incorporated herein by reference.

Other Events. On November 19, 2025, Northern Trust Corporation (the “ Company ”) issued $500,000,000 of its 4.150% Senior Notes due 2030 (the “ Senior Notes ”) and $750,000,000 of its 5.117% Fixed-to-Fixed Rate Subordinated Notes due 2040 (the “ Subordinated Notes ” and, together with the Senior Notes, the “ Notes ”) pursuant to an underwriting agreement, dated as of November 12, 2025, by and among the Company, BofA Securities, Inc., Citigroup Global Markets Inc., J.P. Morgan Securities LLC a…

Results of Operations and Financial Condition The information contained in the registrant’s October 22, 2025 press release, reporting on the registrant’s earnings for the three and nine months ended September 30, 2025, a copy of which is attached as Exhibit 99.1 hereto, is incorporated herein by reference.

President – Asset Management — Michael Hunstad: Michael Hunstad was promoted to President – Asset Management, replacing Daniel E. Gamba.

Other Events On July 28, 2025, Northern Trust Corporation (the “Corporation”) issued a press release announcing that the Corporation’s Board of Directors approved a new common stock repurchase authorization (the “New Stock Repurchase Authorization”) authorizing, but not obligating, the repurchase of up to $2.5 billion of the Corporation’s outstanding shares of common stock from time to time . The New Stock Repurchase Authorization has no expiration date.

Results of Operations and Financial Condition The information contained in the registrant’s July 23, 2025 press release, reporting on the registrant’s earnings for the three and six months ended June 30, 2025, a copy of which is attached as Exhibit 99.1 hereto, is incorporated herein by reference.

Results of Operations and Financial Condition The information contained in the registrant’s April 22, 2025 press release, reporting on the registrant’s earnings for the three months ended March 31, 2025, a copy of which is attached as Exhibit 99.1 hereto, is incorporated herein by reference.

Chandra Dhandapani, Robert E. Moritz, Richard M. Petrino: Chandra Dhandapani and Robert E. Moritz, Richard M. Petrino were appointed to committees of the Board.

Results of Operations and Financial Condition The information contained in the registrant’s January 23, 2025 press release, reporting on the registrant’s earnings for the three and twelve months ended December 31, 2024, a copy of which is attached as Exhibit 99.1 hereto, is incorporated herein by reference.

Director — Robert Moritz and Richard Petrino: Two new directors were elected to the Board of Directors.

Results of Operations and Financial Condition The information contained in the registrant’s October 23, 2024 press release, reporting on the registrant’s earnings for the three and nine months ended September 30, 2024, a copy of which is attached as Exhibit 99.1 hereto, is incorporated herein by reference.

Multiple internal promotions and role changes within the company's leadership structure.

Results of Operations and Financial Condition The information contained in the registrant’s July 17, 2024 press release, reporting on the registrant’s earnings for the three and six months ended June 30, 2024, a copy of which is attached as Exhibit 99.1 hereto, is incorporated herein by reference.

Director — Chandra Dhandapani: Election of a new director to the Board.

Results of Operations and Financial Condition The information contained in the registrant’s April 16, 2024 press release, reporting on the registrant’s earnings for the three months ended March 31, 2024, a copy of which is attached as Exhibit 99.1 hereto, is incorporated herein by reference.

Results of Operations and Financial Condition The information contained in the registrant’s April 16, 2024 press release, reporting on the registrant’s earnings for the three months ended March 31, 2024, a copy of which is attached as Exhibit 99.1 hereto, is incorporated herein by reference.

Other Events As previously disclosed, Northern Trust Fiduciary Services (Guernsey) Limited (“NTFS”), an indirect subsidiary of Northern Trust Corporation, was among the defendants in a re-trial at a French appellate court regarding a charge of complicity in estate tax fraud in connection with the administration of two trusts for which NTFS serves as trustee. On March 5, 2024, the French court rendered a judgement of conviction against all defendants, including NTFS. NTFS was ordered by the co…

Results of Operations and Financial Condition The information contained in the registrant’s January 18, 2024 press release, reporting on the registrant’s earnings for the three and twelve months ended December 31, 2023, a copy of which is attached as Exhibit 99.1 hereto, is incorporated herein by reference.

Controller — John P. Landers: John P. Landers was promoted to Controller, and Lauren E. Allnutt will serve as Chief Audit Executive.

Results of Operations and Financial Condition The information contained in the registrant’s October 18, 2023 press release, reporting on the registrant’s earnings for the three and nine months ended September 30, 2023, a copy of which is attached as Exhibit 99.1 hereto, is incorporated herein by reference.