Other Events On August 18, 2026, TrustCo Bank Corp NY (“TrustCo”) issued a press release announcing that its Board of Directors declared an increased quarterly cash dividend of $0.40 per share, or $1.60 per share on an annualized basis. The declared dividend represents an increase of 5.3% over the prior dividend amount. The dividend will be payable on October 1, 2026 to shareholders of record at the close of business on September 4, 2026. A copy of the press release announcing the dividend de…

Results of Operations and Financial Condition On July 21, 2026 TrustCo Bank Corp NY (“TrustCo”) issued a press release with results for the quarter ending June 30, 2026. Attached is a copy of the press release labeled as Exhibit 99(a).

The filing describes an amendment to the equity incentive plan, which is not a management change.

Other Events On May 20, 2026 TrustCo Bank Corp NY (the “Company”) announced that on May 19, 2026 its Board of Directors declared a quarterly cash dividend of $0.38 per share, or $1.52 per share on an annualized basis. The dividend will be payable on July 1, 2026 to shareholders of record at the close of business on June 5, 2026. A copy of the press release announcing dividend declaration is attached as Exhibit 99.1 to this report and is incorporated herein by reference.

Results of Operations and Financial Condition On April 21, 2026 TrustCo Bank Corp NY (“TrustCo”) issued a press release with results for the quarter ending March 31, 2026. Attached is a copy of the press release labeled as Exhibit 99(a).

Other Events On February 17, 2026 TrustCo Bank Corp NY (the “Company”) announced that its Board of Directors declared a quarterly cash dividend of $0.38 per share, or $1.52 per share on an annualized basis. The dividend will be payable on April 1, 2026 to shareholders of record at the close of business on March 6, 2026. A copy of the press release announcing dividend declaration is attached as Exhibit 99.1 to this report and is incorporated herein by reference.

Regulation FD Disclosure. As part of TrustCo Bank Corp NY’s (“TrustCo” or the “Company”) ongoing shareholder engagement efforts, TrustCo has been engaging in discussions with HoldCo Asset Management (“HoldCo”) regarding the Company’s business, operations, financial condition, capital allocation, strategic considerations, mergers and acquisitions strategy, corporate governance practices, board composition and other related matters. As previously announced on December 19, 2025, TrustCo authoriz…

Executive Vice President and Chief Operating Officer — Robert M. Leonard: Robert M. Leonard intends to retire from his positions with the company, effective December 31, 2026.

Results of Operations and Financial Condition On January 21, 2026 TrustCo Bank Corp NY (“TrustCo”) issued a press release with results for the quarter ending December 31, 2025. Attached is a copy of the press release labeled as Exhibit 99(a).

Other Events On December 19, 2025 TrustCo Bank Corp NY (the “Company”) announced that its Board of Directors authorized a stock repurchase program. Under the stock repurchase program, the Company may repurchase up to 2,000,000 shares of its common stock, or approximately 11% of its currently outstanding shares. A copy of the press release dated December 19, 2025, announcing the stock repurchase program is attached as Exhibit 99.1 to this report and is incorporated herein by reference.

Other Events On November 19, 2025 TrustCo Bank Corp NY (the “Company”) announced that its Board of Directors declared a quarterly cash dividend of $0.38 per share, or $1.52 per share on an annualized basis. The dividend will be payable on January 2, 2026 to shareholders of record at the close of business on December 5, 2025. A copy of the press release announcing dividend declaration is attached as Exhibit 99.1 to this report and is incorporated herein by reference.

Results of Operations and Financial Condition On October 21, 2025 TrustCo Bank Corp NY (“TrustCo”) issued a press release with results for the quarter ending September 30, 2025. Attached is a copy of the press release labeled as Exhibit 99(a).

Other Events On August 19, 2025, TrustCo Bank Corp NY (“TrustCo”) issued a press release announcing that its Board of Directors declared an increased quarterly cash dividend of $0.38 per share, or $1.52 per share on an annualized basis. The declared dividend represents an increase of 5.6% over the prior dividend amount. The dividend will be payable on October 1, 2025 to shareholders of record at the close of business on September 5, 2025. A copy of the press release announcing dividend declar…

Results of Operations and Financial Condition On July 21, 2025 TrustCo Bank Corp NY (“TrustCo”) issued a press release with results for the quarter ending June 30, 2025. Attached is a copy of the press release labeled as Exhibit 99(a).

Other Events On May 21, 2025 TrustCo Bank Corp NY (“TrustCo”) issued a press release announcing that on May 20, 2025 its Board of Directors had declared a quarterly cash dividend of $0.36 per share. The dividend is payable July 1, 2025, to shareholders of record at the close of business on June 6, 2025. A copy of the press release is attached to this Current Report on Form 8-K as Exhibit 99(a) and is incorporated herein by reference.

Results of Operations and Financial Condition On April 21, 2025 TrustCo Bank Corp NY (“TrustCo”) issued a press release with results for the quarter ending March 31, 2025. Attached is a copy of the press release labeled as Exhibit 99(a).

Other Events On March 18, 2025 TrustCo Bank Corp NY (the “Company”) announced that its Board of Directors authorized a stock repurchase program. Under the stock repurchase program, the Company may repurchase up to 1,000,000 shares, or approximately 5% of its currently outstanding common stock. A copy of the press release dated March 18, 2025, announcing the stock repurchase program is attached as Exhibit 99.1 to this report and is incorporated herein by reference.

Other Events On February 19, 2025 TrustCo Bank Corp NY (“TrustCo”) issued a press release announcing that on February 18, 2025 its Board of Directors had declared a quarterly cash dividend of $0.36 per share. The dividend is payable April 1, 2025, to shareholders of record at the close of business on March 7, 2025. A copy of the press release is attached to this Current Report on Form 8-K as Exhibit 99(a) and is incorporated herein by reference.

Results of Operations and Financial Condition On January 21, 2025 TrustCo Bank Corp NY (“TrustCo”) issued a press release with results for the quarter ending December 31, 2024. Attached is a copy of the press release labeled as Exhibit 99(a).

Other Events On November 19, 2024 TrustCo Bank Corp NY (“TrustCo”) issued a press release announcing that its Board of Directors had declared a quarterly cash dividend of $0.36 per share. The dividend is payable January 2, 2025, to shareholders of record at the close of business on December 6, 2024. A copy of the press release is attached to this Current Report on Form 8-K as Exhibit 99(a) and is incorporated herein by reference.

Results of Operations and Financial Condition On October 21, 2024 TrustCo Bank Corp NY (“TrustCo”) issued a press release with results for the quarter ending September 30, 2024. Attached is a copy of the press release labeled as Exhibit 99(a).

Other Events On August 20, 2024 TrustCo Bank Corp NY (“TrustCo”) issued a press release announcing that its Board of Directors had declared a quarterly cash dividend of $0.36 per share. The dividend is payable October 1, 2024, to shareholders of record at the close of business on September 6, 2024. A copy of the press release is attached to this Current Report on Form 8-K as Exhibit 99(a) and is incorporated herein by reference.

Results of Operations and Financial Condition On July 22, 2024 TrustCo Bank Corp NY (“TrustCo”) issued a press release with results for the quarter ending June 30, 2024. Attached is a copy of the press release labeled as Exhibit 99(a).

Chief Operating Officer — Robert M. Leonard: The filing announces the internal promotion of a long-tenured executive to the role of Chief Operating Officer, which is a succession event rather than a departure.

Other Events On May 21, 2024 TrustCo Bank Corp NY (“TrustCo”) issued a press release announcing that its Board of Directors had declared a quarterly cash dividend of $0.36 per share. The dividend is payable July 1, 2024, to shareholders of record at the close of business on June 7, 2024. A copy of the press release is attached to this Current Report on Form 8-K as Exhibit 99(a) and is incorporated herein by reference.