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            <CountryCd>UK</CountryCd>
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        <ExplanationTxt>The Company is exempt from federal income taxes under Internal Revenue Code Section 501(c)(3) and therefore has made no provision for federal or state income taxes. The Company follows accounting guidance regarding the recognition, measurement, presentation, and disclosure of uncertain tax positions in the financial statements. Tax positions taken or expected to be taken in the course of preparing the Companys tax returns, including the position that the Company qualifies as a tax exempt entity, are required to be evaluated to determine whether the tax positions are "more-likely-than-not" to be upheld under regulatory review. Tax positions not deemed to meet a more-likely-than-not threshold would be disclosed in the financial statements. There were no uncertain tax positions that require disclosure in the financial statements as of December 31, 2015 and 2014. The Company records interest and penalties, if any, as part of income tax expense. No interest or penalties were recorded in 2015 or 2014. The Companys income tax returns are subject to review and examination by federal and state taxing authorities. The Company is currently open to audit under the applicable statutes of limitations by the Internal Revenue Service and state taxing authorities for the years ended after December 31, 2011.</ExplanationTxt>
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          <PersonNm>CHU RING HAZEL</PersonNm>
        </NameOfInterested>
        <RelationshipDescriptionTxt>JOHN CHU, ptr of law firm</RelationshipDescriptionTxt>
        <TransactionAmt>3715</TransactionAmt>
        <TransactionDesc>LEGAL FEES</TransactionDesc>
        <SharingOfRevenuesInd>false</SharingOfRevenuesInd>
      </BusTrInvolveInterestedPrsnGrp>
      <BusTrInvolveInterestedPrsnGrp>
        <NameOfInterested>
          <PersonNm>Hamilton Brook Smith Reynolds</PersonNm>
        </NameOfInterested>
        <RelationshipDescriptionTxt>David Brook, partner</RelationshipDescriptionTxt>
        <TransactionAmt>8905</TransactionAmt>
        <TransactionDesc>legal fees</TransactionDesc>
        <SharingOfRevenuesInd>false</SharingOfRevenuesInd>
      </BusTrInvolveInterestedPrsnGrp>
    </IRS990ScheduleL>
    <IRS990ScheduleO documentId="IRS990ScheduleO">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>990, PART VI, SECTION A, LINE 2 - FAMILY RELATIONSHIP</FormAndLineReferenceDesc>
        <ExplanationTxt>MELINA FAN AND KENNETH FAN ARE SIBLINGs. MELINA FAN AND BENJIE CHEN ARE SPOUSES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>990, PART VI, SECTION B, LINE 11 - REVIEW PROCESS OF FORM 990</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990 WAS REVIEWED BY MANAGEMENT ALONG WITH THE AUDITED FINANCIAL STATEMENTS. A FULL COPY OF FORM 990 IS PROVIDED TO ALL BOARD MEMBERS FOR REVIEW PRIOR FILING TO THE IRS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>990, PART VI, SECTION B, LINE 12 - CONFLICT OF INTEREST POLICY</FormAndLineReferenceDesc>
        <ExplanationTxt>ADDGENE, INC. HAS A CONFLICT OF INTEREST POLICY IN PLACE. ALL OFFICERS, DIRECTORS AND KEY EMPLOYEES ARE REQUIRED TO DISCLOSE ANNUALLY any INTERESTS THAT COULD GIVE RISE to CONFLICTS. INQUIRES ARE MADE DURING BOARD OF DIRECTOR MEETINGS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>990, PART VI, SECTION B, LINE 15 - PROCESS FOR DETERMINING COMPENSATION</FormAndLineReferenceDesc>
        <ExplanationTxt>ADDGENE, INC.'S INDEPENDENT BOARD MEMBERS REVIEWED AND DETERMINED THE COMPENSATION OF ALL OFFICERS ANNUALLY.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>990, PART VI, SECTION C, LINE 19 - ORGANIZATION DOCUMENTS</FormAndLineReferenceDesc>
        <ExplanationTxt>ADDGENE, INC.'S GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS are AVAILABLE TO THE PUBLIC UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>990, PART XI, LINE 9 - OTHER CHANGES IN NET ASSETS</FormAndLineReferenceDesc>
        <ExplanationTxt>Foreign currency translation (loss) (4,460)</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>990, Part VI, section A, Line 4 - changes to governing documents</FormAndLineReferenceDesc>
        <ExplanationTxt>The organzation made the following changes to its bylaws: Article I, General Matters, Section 1.2 Location. The location of the principal office of the corporation shall be at 75 Sidney Street, Cambridge, Massachusetts 02139 or at such other place in the United States as the Directors shall from time to time determine. Article III, Board of Directors, Section 3.2 Election and Term of Office. The term of office of each Director, other than ex-officio members, shall be three (3) years. In order to stagger terms for the Directors serving in 2015 under the previous one (1) year term guideline, the terms of the Directors serving as of January 2015 shall be staggered in accordance with the following provisions: The Directors shall be divided into three (3) groups, with each group containing three (3) or more members. The first group will serve under a one (1) year term ending January of 2016, the second group will serve under a two (2) year term ending in January of 2017 and the third group will serve under a three (3) year term ending in January 2018. Thereafter, at each Annual Meeting of the Board of Directors, the Board of Directors shall elect directors to fill expiring terms, each director to hold office for a term of three (3) years until the directors successor has been elected and qualified, except that in the event of a vacancy, which may be filled at any meeting of the Board of Directors, or in the case of a newly-elected director, the director may be elected to a shorter term as may be appropriate to maintain the balance of staggered terms. Directors shall hold office until their successors are elected and qualified. The Executive Director of the corporation shall serve as an ex-officio member of the Board of Directors, and shall have such other powers and duties as are prescribed to directors in these bylaws. Article V, Officers, Section 5 1 Election. The initial officers shall be those persons named as officers in the Articles of Organization. Thereafter, the Board of Directors shall elect from its members a Chairperson and shall further elect a President, a Treasurer, and a Clerk (who must be a resident of the Commonwealth of Massachusetts) who need not also be Directors at the Annual Meeting of the Board of Directors (or special meeting in lieu thereof). The Board of Directors at any time may also elect such Vice Presidents, Assistant Clerks, Assistant Secretaries and Assistant Treasurers or other officers, who need not also be Directors, as the Board of Directors deems appropriate. One person may hold more than one office. Secretaries and Assistant Treasurers or other officers, who need not also be Directors, as the Board of Directors deems appropriate. One person may hold more than one office.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>