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        <Desc>Nuclear Materials Security Program (NMS). In 2023 NMS strengthened global nuclear security through comprehensive, data-driven analysis and by convening leaders to identify and commit to concrete actions. NTI launched the 2023 Nuclear Security Index and accompanying data-deep website. This latest edition of the NTI Nuclear Security Index -a quantitative assessment of nuclear security conditions in 175 countries and Taiwan-found that nuclear security conditions have regressed in the countries and areas with nuclear facilities and weapons-useable nuclear materials, and provided recommendations for getting progress back on track. The NTI team hosted two launch events for the NTI Index: one for government officials and experts in Washington, DC and one for the diplomatic community in Vienna, Austria. We also convened nuclear security leaders from across governments, industry, and international and non-governmental organizations for the sixteenth meeting of the Global Dialogue on Nuclear Security Priorities. Since 2012, the Global Dialogue has served as an informal forum for these stakeholders to discuss innovative approaches and encourage tangible action to strengthen the global nuclear security architecture. Held in Vienna, Austria in April, it was the largest meeting of the Global Dialogue since before the COVID-19 pandemic. The day before the Dialogue began, NTI hosted the first-ever Emerging Nuclear Security Leaders session. We elevated the importance of security and nonproliferation considerations for nuclear energy expansion with the rollout of our Playbook for Nuclear Energy Development. In cooperation with partners at the Clean Air Task Force and EFI Foundation, we launched the Playbook in December in Dubai on the margins of the COP28 climate conference. The report outlines responsible and effective approaches for scaling nuclear energy to meet climate and energy security objectives and identifies actions countries can take to reduce nuclear proliferation and security risks as they embark on new nuclear energy programs. NTI and the Emirates Nuclear Energy Corporation also convened more than 40 experts from the United Arab Emirates, the United States, and the Middle East region for a workshop in Abu Dhabi to catalyze a discussion on how the region and the international community can cooperate on nuclear energy in a way that bolsters nonproliferation and nuclear security standards and practices. We advanced international efforts to verify nuclear disarmament. Through the International Partnership for Nuclear Disarmament Verification (IPNDV), NTI held two working group meetings that furthered the international community's understanding of how to monitor the disarmament process. IPNDV works to imagine the technologies and methods that might be necessary for future multilateral arms control efforts to verify the elimination of nuclear weapons. Our Gender Champions in Nuclear Policy (GCNP) network helped build a more diverse, inclusive, and equitable nuclear policy field. GCNP is a leadership network of heads of organizations who become Gender Champions by pledging to advance gender equity within their spheres of influence. This network grew to a membership of 86 organizations by the end of 2023. For the fourth consecutive year, 60% of the more than 250 annual commitments to action made by Gender Champions were successfully implemented.</Desc>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Sam Nunn</PersonNm>
        <TitleTxt>Strategic Advisor and Co-Chair, Board of Directors</TitleTxt>
        <BaseCompensationFilingOrgAmt>179646</BaseCompensationFilingOrgAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Page Stoutland</PersonNm>
        <TitleTxt>VP Scientific &amp; Technical Affairs</TitleTxt>
        <BaseCompensationFilingOrgAmt>139296</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 1a</FormAndLineReferenceDesc>
        <ExplanationTxt>NTI's travel policy allows for (1) first class travel for certain officers and Board members for business purposes; and (2) companion travel for certain officers and Board members to attend Board meetings. These benefits are not treated as taxable compensation to the recipients.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Schedule J, Part I, Line 3</FormAndLineReferenceDesc>
        <ExplanationTxt>Each year, NTI participates in a field-wide compensation study, and periodically engages a consultant to perform a compensation study and to benchmark NTI's compensation levels. These studies are used to inform compensation decisions. Additionally, NTI's Board of Directors has a Compensation Committee whose members may not include current or former directors who are also salaried senior executives of NTI. Annually, the Compensation Committee reviews the performance of NTI's senior executives, recommends to the full Board its determination of compensation and benefits of the CEO, President, the highest-ranking Vice President, and the Treasurer. The Compensation Committee also determines the annual salary and benefits of NTI's other senior executives.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleO documentId="R000010" softwareId="23018249" softwareVersionNum="v1.00">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>One of NTI's Board members is the daughter of one of NTI's Co-Chairs. NTI's Corporate Secretary is married to the Board member who is a daughter of one of NTI's Co-Chairs.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>In 2023, NTI's by-laws were amended to reflect changes to the terms directors serve on NTI's Board.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>NTI's Form 990 is prepared by its Finance Department. It is reviewed by NTI's Chief Financial Officer, President, CEO, its external auditors, BDO, and by its external legal counsel, Davis Pickren Seydel and Sneed. The Form 990 is also reviewed by NTI's Audit Committee, which reviews the form on behalf of the full Board. The full Board is briefed on the contents of the form and the date of the filing.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12a</FormAndLineReferenceDesc>
        <ExplanationTxt>NTI's Employee Handbook includes a conflict of interest policy.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>NTI's bylaws require that a copy of the organization's Conflict of Interest Policy, as adopted by the Board, be furnished to each Board member, officer, and staff member. NTI prohibits officers and staff from participating or engaging in any activity for which a conflict of interest exists. Officers and staff also give consideration to perceived conflicts of interest. Board members are recused from decisions of the Board in which a conflict of interest exists. Board members also give consideration to perceived conflicts of interest. Board members, officers, and staff are required to disclose to NTI any related party and any reportable affiliates that may apply for, or otherwise be considered by NTI, for a grant or other financial transaction.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 15</FormAndLineReferenceDesc>
        <ExplanationTxt>NTI's Board of Directors has a Compensation Committee that annually reviews the performance of NTI's senior executives, recommends to the full Board its determination of compensation and benefits of the CEO, President, the highest-ranking Vice President, and the Treasurer. The Compensation Committee also determines the annual salary and benefits of NTI's other senior executives.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>NTI's website includes links to downloadable copies of its annual reports, which include financial data. Other information is available upon request.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part IX, Line 11g</FormAndLineReferenceDesc>
        <ExplanationTxt>Expenses included in this line comprise professional services other than legal fees, accounting fees, fundraising fees, and Compensation of current officers, directors, trustees ($2,829,290), honoraria ($58,750), employment recruiting fees ($49,718), temporary help ($43,718), outsourced payroll and flexible spending administrative services ($47,922), and photography ($25,579).</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>Other revenue consists of refunds of unspent grant monies related to grants NTI made in 2022 to Columbia University</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
