INIS International Isotopes Inc - 8-K

Item 5.03 Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year.

On December 23, 2025, International Isotopes Inc. (“we,” “our,” “us,” or the “Company”) filed a Certificate of Amendment in the state of Texas for the sole purpose of amending our Certificate of Formation to change our corporate name from International Isotopes Inc. to Radnostix, Inc. (the “ Name Change ”). As was previously disclosed on a Schedule 14C Information Statement filed by the Company with the Securities and Exchange Commission on November 26, 2025, our board of directors approved the Name Change on October 21, 2025, and a majority of shareholders approved the Name Change by written consent on November 25, 2025.

The Name Change was implemented because our line of business has expanded from providing radiochemicals and non-medical radioisotopes and a focus on energy-sector related isotopes to providing a broader portfolio of radioisotope, theranostics, and related products, devices, and accessories, mainly focused on healthcare applications. We believe that Radnostix, Inc. better reflects our focus on radiosiotopes and theranostics going forward.

At this time, our common stock will continue to trade under the current ticket symbol “INIS” on the OTCQB marketplace. Shareholders are not required to take any action regarding their stock certificates as a result of the name change.

Item 8.01 Other Events.

On December 31, 2025, the Company issued a press release announcing the Name Change. A copy of the press release is attached here as Exhibit 99.1 and is incorporated herein by reference.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit Number

Description

99.1

Press Release regarding Name Change dated December 31, 2025.

104

Cover Page Interactive Data File (embedded within the Inline XBRL document)