Results of Operations and Financial Condition. On August 7, 2026, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Results of Operations and Financial Condition. On May 8, 2026, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Results of Operations and Financial Condition. On March 27, 2026, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Results of Operations and Financial Condition. On November 6, 2025, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Results of Operations and Financial Condition. On August 8, 2025, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Director — Donna Vigilante: Ms. Donna Vigilante, the Company's President, was appointed to serve on the Board of Directors.

Results of Operations and Financial Condition. On May 8, 2025, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Results of Operations and Financial Condition. On March 21, 2025, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Results of Operations and Financial Condition. On November 8, 2024, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Results of Operations and Financial Condition. On August 9, 2024, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Results of Operations and Financial Condition. On May 10, 2024, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Results of Operations and Financial Condition. On March 22, 2024, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Entry into a Material Definitive Agreement. On March 30, 2023, United-Guardian, Inc. (the “Company”) entered into a manufacturing and supply agreement with Amsino Healthcare (USA), Inc. (“Amsino”), the successor in interest to Smiths Medical, effective as of January 1, 2023 (the “Agreement”). This Agreement, modeled after a previously executed manufacturing and supply agreement with Smiths Medical, provides the framework in which Amsino would manufacture and supply the Company with its pharma…

Director — Catherine Kolinski: Appointment of Catherine Kolinski as a Director with extensive industry experience.

Results of Operations and Financial Condition. On November 6, 2023, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Termination of a Material Definitive Agreement On October 10, 2023, as directed and approved by the Board of Directors of United-Guardian, Inc. (the “Company”), the Company notified Ashland Specialty Ingredients (“Ashland”), one of its marketing and distribution partners, that it was not renewing its Exclusive Distributor Agreement with Ashland dated July 5, 2000, as amended by the letter agreement dated May 5, 2010 (the “Distribution Agreement”). The Distribution Agreement provided Ashland w…

Changes in Registrant’s Certifying Accountant Previous Independent Registered Public Accounting Firm On August 29, 2023, as directed and approved by the Audit Committee of the Board of Directors (the “Board”) of United-Guardian, Inc. (the “Company”), the Company formally dismissed Baker Tilly US, LLP (“Baker Tilly”) as the Company’s independent registered public accounting firm. The audit reports of Baker Tilly on the Company’s financial statements for the years ended December 31, 2022 and 20…

Results of Operations and Financial Condition. On August 11, 2023, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

President — Donna Vigilante: Ms. Donna Vigilante was promoted to President of the Company.

President, CEO, Director — Beatriz Blanco: Beatriz Blanco ended her employment as President, CEO, and Director with an amicable departure.

Results of Operations and Financial Condition. On May 11, 2023, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing On April 20, 2023, United-Guardian, Inc. (the “Company”) received a deficiency letter from the Listing Qualifications Department (the “Staff”) of The Nasdaq Stock Market, LLC (“Nasdaq”) notifying the Company that it is not in compliance with Nasdaq Listing Rule 5450(b)(2)(A) (the “Minimum MVLS Requirement”) for continued listing on the Nasdaq Global Select Market, as the market value of the Com…

Results of Operations and Financial Condition. On March 17, 2023, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

Results of Operations and Financial Condition. On November 9, 2022, the Registrant issued a press release, a copy of which is attached hereto as Exhibit 99.1 and is incorporated herein by reference.

President and Chief Executive Officer — Ken Globus: Ken Globus retired from his positions as President and CEO, with Beatriz Blanco appointed as the new President and CEO.