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        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>DURING THE YEARS ENDED DECEMBER 31, 2020 AND 2019, MIE HAS DOCUMENTED ITS CONSIDERATION OF FASB ASC 740-10, INCOME TAXES, THAT PROVIDES GUIDANCE FOR REPORTING UNCERTAINTY IN INCOME TAXES AND HAS DETERMINED THAT NO MATERIAL UNCERTAIN TAX POSITIONS QUALIFY FOR EITHER RECOGNITION OR DISCLOSURE IN THE FINANCIAL STATEMENTS.</ExplanationTxt>
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        <PersonNm>MATTHEW ONEK</PersonNm>
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        <PersonNm>MONIQUE AIKEN</PersonNm>
        <TitleTxt>VP, PROGRAMS - UNTIL 12/2020</TitleTxt>
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        <FormAndLineReferenceDesc>PART I, LINE 7</FormAndLineReferenceDesc>
        <ExplanationTxt>DURING THE YEAR ENDED DECEMBER 31, 2020, MATTHEW ONEK, PRESIDENT &amp; CEO, RECEIVED A BONUS PAYMENT BASED ON HIS PERFORMANCE.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART I, LINE 1, DESCRIPTION OF ORGANIZATION MISSION:</FormAndLineReferenceDesc>
        <ExplanationTxt>MIE IS THE LEADING IMPACT INVESTING NETWORK FOR FOUNDATIONS DEDICATED TO DEPLOYING CAPITAL FOR SOCIAL AND ENVIRONMENTAL CHANGE.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART III, LINE 1, DESCRIPTION OF ORGANIZATION MISSION:</FormAndLineReferenceDesc>
        <ExplanationTxt>MIE IS A CHARITABLE AND EDUCATIONAL ORGANIZATION THAT PROVIDES EDUCATIONAL FORUMS, MATERIALS, TRAINING, AND SUPPORT TO FOUNDATIONS AND OTHER PHILANTHROPIC ORGANIZATIONS IN ORDER TO ENCOURAGE THEIR EFFECTIVE USE OF MISSION INVESTING, INCLUDING BOTH PROGRAM RELATED AND MISSION-RELATED INVESTMENTS, AS A SIGNIFICANT PART OF THEIR CHARITABLE ACTIVITIES.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FEDERAL FORM 990 IS SENT VIA E-MAIL TO THE TREASURER AND THE BOARD CHAIR FOR REVIEW ON BEHALF OF THE GOVERNING BODY. THE REVIEWS ARE VERIFIED VIA E-MAIL PRIOR TO FILING THE FEDERAL FORM 990 WITH THE INTERNAL REVENUE SERVICE. UPON REVIEW, THE FEDERAL FORM 990 IS DISTRIBUTED TO THE FULL BOARD.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ANNUALLY EACH BOARD MEMBER OF MIE COMPLETES A "DISCLOSURE STATEMENT" THAT REPORTS OBLIGATIONS AND DOCUMENTS DISCLOSURES THAT ARE NECESSARY TO COMPLY WITH THE ORGANIZATION'S CONFLICT OF INTEREST POLICY AND FORM 990 REQUIREMENTS. IF A CONFLICT OF INTEREST ARISES, THE BOARD MEMBER SHOULD DISCLOSE THE CONFLICT. BOARD MEMBERS WITH CONFLICTS OF INTEREST SHOULD ABSTAIN FROM VOTING ON ANY MATTERS WHERE THERE IS A CONFLICT OF INTEREST.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>IN SETTING CEO'S COMPENSATION, THE BOARD OF DIRECTORS ENGAGES AN INDEPENDENT CONSULTANT / EXECUTIVE SEARCH FIRM WHO REVIEWS COMPARABLE SALARIES FROM OTHER NONPROFITS' FEDERAL FORM 990S AND SALARY SURVEY DATA. THE BOARD OF DIRECTORS' APPROVAL IS REQUIRED FOR THE CEO'S COMPENSATION.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>MIE MAKES ITS GOVERNING DOCUMENTS AND FINANCIAL STATEMENTS AVAILABLE UPON REQUEST.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART IX, LINE 11G</FormAndLineReferenceDesc>
        <ExplanationTxt>HR SERVICES: PROGRAM SERVICE EXPENSES 0. MANAGEMENT AND GENERAL EXPENSES 106,758. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 106,758. RETIREMENT PLAN SUPPORT: PROGRAM SERVICE EXPENSES 3,095. MANAGEMENT AND GENERAL EXPENSES 2,157. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 5,252. WEBSITE &amp; OTHER DESIGN: PROGRAM SERVICE EXPENSES 31,001. MANAGEMENT AND GENERAL EXPENSES 21,606. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 52,607. COMMUNICATION: PROGRAM SERVICE EXPENSES 32,838. MANAGEMENT AND GENERAL EXPENSES 22,887. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 55,725. STRATEGIC CONSULTING: PROGRAM SERVICE EXPENSES 58,719. MANAGEMENT AND GENERAL EXPENSES 40,925. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 99,644. NATIONAL CONFERENCE SUPPORT: PROGRAM SERVICE EXPENSES 80,568. MANAGEMENT AND GENERAL EXPENSES 56,152. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 136,720. OTHER PROFESSIONAL FEE: PROGRAM SERVICE EXPENSES 23,661. MANAGEMENT AND GENERAL EXPENSES 8,791. FUNDRAISING EXPENSES 0. TOTAL EXPENSES 32,452.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>
