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        <Description>State filings</Description>
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          <AddressLine2>RESTRICTED</AddressLine2>
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          <ZIPCode>RESTRICTED</ZIPCode>
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        <Identifier>Description of Uncertain Tax Positions Under FIN 48:</Identifier>
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        <Explanation>Management evaluated ASTS's tax positions, and has determined that no significant uncertain tax positions qualify for either recognition or disclosure in the consolidated financial statements at December 31, 2012 and 2011.</Explanation>
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        <PurposeOfGrant>Scientific Research- Scientist Grant</PurposeOfGrant>
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          <State>MN</State>
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        </RecipientNameBusiness>
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          <State>MA</State>
          <ZIPCode>02114</ZIPCode>
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        <PurposeOfGrant>Scientific Research- Fellowship in Transplantation</PurposeOfGrant>
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        </RecipientNameBusiness>
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          <ZIPCode>43210</ZIPCode>
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        <MethodOfValuation>n/a</MethodOfValuation>
        <DescriptionOfNonCashAssistance>n/a</DescriptionOfNonCashAssistance>
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        <MethodOfValuation>n/a</MethodOfValuation>
        <DescriptionOfNonCashAssistance>n/a</DescriptionOfNonCashAssistance>
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      <Form990ScheduleIPartIII>
        <TypeOfGrant>Student mentorship grants</TypeOfGrant>
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        <AmountOfCashGrant>4500</AmountOfCashGrant>
        <MethodOfValuation>n/a</MethodOfValuation>
        <DescriptionOfNonCashAssistance>n/a</DescriptionOfNonCashAssistance>
      </Form990ScheduleIPartIII>
      <Form990ScheduleIPartIV>
        <Identifier>Procedure for Monitoring Grants in the U.S.:</Identifier>
        <ReturnReference>Part I, Line 2:</ReturnReference>
        <Explanation>Schedule I, Part I, Line 2: Grants are awarded based on a competitive review by ASTS leadership, Grants Review Committee members and members-at-large. A budget is required for each grant application and any variance from the submitted budget requires approval of the Grants Review Committee. For grants over $10,000, checks are issued to the institution in two installments. Prior to dispersing the second installment, a progress report is due to the ASTS office. Any concerns are addressed prior to issuing the remaining funds. Grants of less than $10,000 are paid as a single payment.</Explanation>
      </Form990ScheduleIPartIV>
    </IRS990ScheduleI>
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      <CompensationSurvey>X</CompensationSurvey>
      <BoardOrCommitteeApproval>X</BoardOrCommitteeApproval>
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      <SupplementalNonqualRetirePlan>0</SupplementalNonqualRetirePlan>
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        <NamePerson>Kimberly Gifford MBA</NamePerson>
        <Title>Executive Director</Title>
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      <GeneralExplanation>
        <ReturnReference>Form 990, Part VI, Section A, line 7a</ReturnReference>
        <Explanation>The affiliated organization, ASTS, has members that elect the governing body which serves both the society and the foundation.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>Form 990, Part VI, Section B, line 11</ReturnReference>
        <Explanation>The 990 is prepared by an independent accountant and a draft of the return is reviewed by the Secretary/Treasurer and Executive Director. The 990 is presented to the board of directors for review and discussion prior to finalizing. Formal approval is recorded in the minutes.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>Form 990, Part VI, Section B, line 12c</ReturnReference>
        <Explanation>To ensure accurate, up to date information, each ASTS Council/Board member shall review his or her disclosure statement during face-to-face meetings and update as necessary between meetings. Each ASTS Council/Board member shall describe clearly his or her interest in each such issue, subject, person or entity on this form and return to the ASTS Executive Director. The information on this form shall be reviewed by the President and Executive Director, and shared with the ASTS Council/Board if relevant to the discussion at hand. The ASTS Council/Board member may voluntarily recuse him/herself from discussion and/or voting on the basis of a conflict of interest. In addition, the ASTS Council/Board may require that an ASTS Council/Board member: (a) refrain from voting on the issue, (b) not participate in either the discussion or the vote on the issue, (c) leave the room during discussion and voting on the issue, or (d) explain his or her interest in the matter fully so the ASTS Council/Board may weigh the ASTS Council/Board members further participation.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>Form 990, Part VI, Section B, line 15</ReturnReference>
        <Explanation>In reviewing and approving the compensation for the Executive Director/CEO, ASTS utilizes impartial decision-makers, comparability data, and concurrent documentation.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>Form 990, Part VI, Section C, line 19</ReturnReference>
        <Explanation>Governing Documents and Conflict of Interest Policy are available on the public portion of the website. Financial Statements are provided upon request.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>Form 990, Part XII, Line 2C</ReturnReference>
        <Explanation>The ASTS Executive Committee assumes responsibility for oversight of the audit of its consolidated financial statements and selection of an independent accountant. The process is consistent with previous years.</Explanation>
      </GeneralExplanation>
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          <BusinessNameLine1>American Society of Transplant Surgeons</BusinessNameLine1>
        </NameOfDisregardedEntity>
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          <AddressLine1>2461 South Clark Street Suite 640</AddressLine1>
          <City>Arlington</City>
          <State>VA</State>
          <ZIPCode>22202</ZIPCode>
        </AddressUS>
        <EIN>133048373</EIN>
        <PrimaryActivities>Promoting education and research for organ and tissue transplantation</PrimaryActivities>
        <LegalDomicileState>OR</LegalDomicileState>
        <ExemptCodeSection>501(c)(3)</ExemptCodeSection>
        <PublicCharityStatus>Line 7</PublicCharityStatus>
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        <ControlledOrg>0</ControlledOrg>
      </Form990ScheduleRPartII>
      <ReceiptOfIntAnnRentsRoyalties>0</ReceiptOfIntAnnRentsRoyalties>
      <GiftGrantOrCapContrToOtherOrg>0</GiftGrantOrCapContrToOtherOrg>
      <GiftGrantOrCapContrFrOtherOrg>1</GiftGrantOrCapContrFrOtherOrg>
      <LoansOrGuaranteesToOtherOrg>0</LoansOrGuaranteesToOtherOrg>
      <LoansOrGuaranteesFromOtherOrg>0</LoansOrGuaranteesFromOtherOrg>
      <DividendsRelatedOrganization>0</DividendsRelatedOrganization>
      <SaleOfAssetsToOtherOrg>0</SaleOfAssetsToOtherOrg>
      <PurchaseOfAssetsFromOtherOrg>0</PurchaseOfAssetsFromOtherOrg>
      <ExchangeOfAssets>0</ExchangeOfAssets>
      <RentalOfFacilitiesToOtherOrgs>0</RentalOfFacilitiesToOtherOrgs>
      <RentalOfFacilitiesFrOtherOrgs>0</RentalOfFacilitiesFrOtherOrgs>
      <PerformOfServicesForOtherOrgs>0</PerformOfServicesForOtherOrgs>
      <PerformOfServicesByOtherOrgs>0</PerformOfServicesByOtherOrgs>
      <SharingOfFacilities>1</SharingOfFacilities>
      <SharingOfPaidEmployees>1</SharingOfPaidEmployees>
      <ReimbursementPaidToOtherOrg>0</ReimbursementPaidToOtherOrg>
      <ReimbursementPaidByOtherOrg>0</ReimbursementPaidByOtherOrg>
      <OtherTransferToOtherOrg>0</OtherTransferToOtherOrg>
      <OtherTransferFromOtherOrg>0</OtherTransferFromOtherOrg>
      <TransactionsRelatedOrgsTable>
        <NameOfOtherOrganization>
          <BusinessNameLine1>ASTS</BusinessNameLine1>
        </NameOfOtherOrganization>
        <TransactionType>C</TransactionType>
        <AmountInvolved>33677</AmountInvolved>
        <MethodOfAmtDetermination>Cash grant</MethodOfAmtDetermination>
      </TransactionsRelatedOrgsTable>
    </IRS990ScheduleR>
  </ReturnData>
</Return>