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        <Description>Leadership Development Program: A highly customized program designed for clinical and administrative leaders that provides education on essential skills necessary to successfully lead transplant centers within a complex financial and regulatory environment.Additional programs include Public Awareness, Joint ASTS/AST, and Grants and Awards.</Description>
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      <TotalExpensesPerForm990>4373357</TotalExpensesPerForm990>
      <Form990ScheduleDPartXIII>
        <Identifier>Description of Uncertain Tax Positions Under FIN 48:</Identifier>
        <ReturnReference>Part X, Line 2:</ReturnReference>
        <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>
      </Form990ScheduleDPartXIII>
      <Form990ScheduleDPartXIII>
        <Identifier>Part XI, Line 2d - Other Adjustments:</Identifier>
        <Explanation>Cost of Sales</Explanation>
      </Form990ScheduleDPartXIII>
      <Form990ScheduleDPartXIII>
        <Identifier>Part XII, Line 2d - Other Adjustments:</Identifier>
        <Explanation>Cost of Sales</Explanation>
      </Form990ScheduleDPartXIII>
    </IRS990ScheduleD>
    <IRS990ScheduleI documentId="RetDoc1041900001">
      <RecordsMaintained>1</RecordsMaintained>
      <RecipientTable>
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          <BusinessNameLine1>ASTS Foundation</BusinessNameLine1>
        </RecipientNameBusiness>
        <AddressUS>
          <AddressLine1>2461 South Clark Street Suite 640</AddressLine1>
          <City>Arlington</City>
          <State>VA</State>
          <ZIPCode>22202</ZIPCode>
        </AddressUS>
        <EINOfRecipient>320020119</EINOfRecipient>
        <IRCSection>501(c)(3)</IRCSection>
        <AmountOfCashGrant>33677</AmountOfCashGrant>
        <DescriptionOfNonCashAssistance>N/A</DescriptionOfNonCashAssistance>
        <PurposeOfGrant>Support grant</PurposeOfGrant>
      </RecipientTable>
      <TotalNbrOf501C3AndGovtGrants>1</TotalNbrOf501C3AndGovtGrants>
      <Form990ScheduleIPartIV>
        <Identifier>Procedure for Monitoring Grants in the U.S.:</Identifier>
        <ReturnReference>Part I, Line 2:</ReturnReference>
        <Explanation>Schedule I, Part I, Line 2: Grant fund was given to ASTS Foundation for use in its research grants program, in accordance with ASTS' grant guidelines.</Explanation>
      </Form990ScheduleIPartIV>
    </IRS990ScheduleI>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <CompensationCommittee>X</CompensationCommittee>
      <Form990OfOtherOrganizations>X</Form990OfOtherOrganizations>
      <WrittenEmploymentContract>X</WrittenEmploymentContract>
      <CompensationSurvey>X</CompensationSurvey>
      <BoardOrCommitteeApproval>X</BoardOrCommitteeApproval>
      <SeverancePayment>0</SeverancePayment>
      <SupplementalNonqualRetirePlan>0</SupplementalNonqualRetirePlan>
      <EquityBasedCompArrangement>0</EquityBasedCompArrangement>
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      <AnyNonFixedPayments>0</AnyNonFixedPayments>
      <InitialContractException>0</InitialContractException>
      <Form990ScheduleJPartII>
        <NamePerson>Kimberly Gifford MBA</NamePerson>
        <Title>Executive Director</Title>
        <BaseCompensationFilingOrg>167963</BaseCompensationFilingOrg>
        <CompBasedOnRelatedOrgs>12037</CompBasedOnRelatedOrgs>
        <BonusFilingOrg>0</BonusFilingOrg>
        <BonusRelatedOrgs>0</BonusRelatedOrgs>
        <OtherCompensationFilingOrg>0</OtherCompensationFilingOrg>
        <OtherCompensationRelatedOrgs>0</OtherCompensationRelatedOrgs>
        <DeferredCompFilingOrg>8393</DeferredCompFilingOrg>
        <DeferredCompRelatedOrgs>607</DeferredCompRelatedOrgs>
        <NontaxableBenefitsFilingOrg>9266</NontaxableBenefitsFilingOrg>
        <NontaxableBenefitsRelatedOrgs>673</NontaxableBenefitsRelatedOrgs>
        <TotalCompensationFilingOrg>185622</TotalCompensationFilingOrg>
        <TotalCompensationRelatedOrgs>13317</TotalCompensationRelatedOrgs>
        <CompReportPrior990FilingOrg>0</CompReportPrior990FilingOrg>
        <CompReportPrior990RelatedOrgs>0</CompReportPrior990RelatedOrgs>
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    <IRS990ScheduleO documentId="RetDoc1044400001">
      <GeneralExplanation>
        <ReturnReference>Form 990, Part VI, Section A, line 6</ReturnReference>
        <Explanation>ASTS has seven categories of membership: Regular Members, Senior Members, International Members, Honorary Members, Associate Members, Candidate Members and Trainee Members.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>Form 990, Part VI, Section A, line 7a</ReturnReference>
        <Explanation>ASTS has a Nominating Committee consisting of the President, President-Elect, two most recent Past Presidents, and the six most senior Councilors-at-Large. Each committee member must adhere to an expanded conflict of interest policy that precludes a voting member of the committee from casting a vote for him/her self and/or casting a vote for/against a candidate from the same institution. The committee will review the nominations from the general membership and put forward a ballot to eligible voting members that contains six candidates for the three councilor positions, three names for the secretary or treasurer position and one name for the president-elect position.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>Form 990, Part VI, Section A, line 7b</ReturnReference>
        <Explanation>All bylaws amendments require approval by the membership. New member approval is subject to membership vote.</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 Treasurer and Executive Director. The 990 is presented to the council 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>Information suggesting an actual or potential conflict of interest shall be communicated to the President, the ASTS Council/Board, and/or the ASTS Executive Director. For each issue raised on an updated annual disclosure form or on an ad hoc basis, a determination shall be made regarding the need for an ASTS Council/Board member's participation to be altered. 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 member's further participation.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>Form 990, Part VI, Section B, line 15</ReturnReference>
        <Explanation>Compensation Committee consisting of officers conducts an annual review with input from committee chairs and council members. The Compensation Committee analyzes relevant benchmark data, reviews the evaluations and makes recommendations to the council for level of compensation.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>Form 990, Part VI, Section C, line 18</ReturnReference>
        <Explanation>ASTS makes available a public disclosure copy of its Federal form 990 upon request.</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>
        <Identifier>Other Fees</Identifier>
        <ReturnReference>Form 990, Part IX, line 11g</ReturnReference>
        <Explanation>Design fees: Program service expenses 20,970. Management and general expenses 68. Fundraising expenses 6. Total expenses 21,044. Journal publisher: Program service expenses 97,575. Management and general expenses 0. Fundraising expenses 0. Total expenses 97,575. Outsource services: Program service expenses 363,599. Management and general expenses 11,141. Fundraising expenses 61. Total expenses 374,801. Public policy fees: Program service expenses 58,507. Management and general expenses 75. Fundraising expenses 5. Total expenses 58,587.</Explanation>
      </GeneralExplanation>
      <GeneralExplanation>
        <ReturnReference>Form 990, Part XII, Line 2c</ReturnReference>
        <Explanation>ASTS's Board of Directors is responsible for the oversight of the audit, including the selection of the independent accountant. The process is consistent with previous years.</Explanation>
      </GeneralExplanation>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="RetDoc1043400001">
      <Form990ScheduleRPartII>
        <NameOfDisregardedEntity>
          <BusinessNameLine1>ASTS Foundation</BusinessNameLine1>
        </NameOfDisregardedEntity>
        <AddressUS>
          <AddressLine1>2461 South Clark Street Suite 640</AddressLine1>
          <City>Arlington</City>
          <State>VA</State>
          <ZIPCode>22202</ZIPCode>
        </AddressUS>
        <EIN>320020119</EIN>
        <PrimaryActivities>Conducts educational research programs relating to organ transplantation.</PrimaryActivities>
        <LegalDomicileState>VA</LegalDomicileState>
        <ExemptCodeSection>501(c)(3)</ExemptCodeSection>
        <PublicCharityStatus>Line 11a, I</PublicCharityStatus>
        <DirectControllingEntityName>
          <BusinessNameLine1>American Society of Transplant Surgeons</BusinessNameLine1>
        </DirectControllingEntityName>
        <ControlledOrg>1</ControlledOrg>
      </Form990ScheduleRPartII>
      <ReceiptOfIntAnnRentsRoyalties>0</ReceiptOfIntAnnRentsRoyalties>
      <GiftGrantOrCapContrToOtherOrg>1</GiftGrantOrCapContrToOtherOrg>
      <GiftGrantOrCapContrFrOtherOrg>0</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 Foundation</BusinessNameLine1>
        </NameOfOtherOrganization>
        <TransactionType>B</TransactionType>
        <AmountInvolved>33677</AmountInvolved>
        <MethodOfAmtDetermination>Cash Grant</MethodOfAmtDetermination>
      </TransactionsRelatedOrgsTable>
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