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      <ReconcilationRevenueExpnssAmt>8800702</ReconcilationRevenueExpnssAmt>
      <OtherChangesInNetAssetsAmt>0</OtherChangesInNetAssetsAmt>
      <MethodOfAccountingAccrualInd>X</MethodOfAccountingAccrualInd>
      <AccountantCompileOrReviewInd>0</AccountantCompileOrReviewInd>
      <FSAuditedInd>0</FSAuditedInd>
      <FederalGrantAuditRequiredInd>0</FederalGrantAuditRequiredInd>
    </IRS990>
    <IRS990ScheduleA documentId="RetDoc1039100001">
      <PublicOrganization170Ind>X</PublicOrganization170Ind>
      <GiftsGrantsContriRcvd170Grp>
        <CurrentTaxYearMinus4YearsAmt>11970151</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>8275545</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>4476134</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>9738108</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>11108462</CurrentTaxYearAmt>
        <TotalAmt>45568400</TotalAmt>
      </GiftsGrantsContriRcvd170Grp>
      <TotalCalendarYear170Grp>
        <CurrentTaxYearMinus4YearsAmt>11970151</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>8275545</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>4476134</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>9738108</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>11108462</CurrentTaxYearAmt>
        <TotalAmt>45568400</TotalAmt>
      </TotalCalendarYear170Grp>
      <SubstantialContributorsTotAmt>18061120</SubstantialContributorsTotAmt>
      <PublicSupportTotal170Amt>27507280</PublicSupportTotal170Amt>
      <GrossInvestmentIncome170Grp>
        <CurrentTaxYearMinus4YearsAmt>42056</CurrentTaxYearMinus4YearsAmt>
        <CurrentTaxYearMinus3YearsAmt>25048</CurrentTaxYearMinus3YearsAmt>
        <CurrentTaxYearMinus2YearsAmt>1170276</CurrentTaxYearMinus2YearsAmt>
        <CurrentTaxYearMinus1YearAmt>2618637</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>5545949</CurrentTaxYearAmt>
        <TotalAmt>9401966</TotalAmt>
      </GrossInvestmentIncome170Grp>
      <OtherIncome170Grp>
        <CurrentTaxYearMinus1YearAmt>156</CurrentTaxYearMinus1YearAmt>
        <CurrentTaxYearAmt>251875</CurrentTaxYearAmt>
        <TotalAmt>252031</TotalAmt>
      </OtherIncome170Grp>
      <TotalSupportAmt>55222397</TotalSupportAmt>
      <GrossReceiptsRltdActivitiesAmt>994320</GrossReceiptsRltdActivitiesAmt>
      <PublicSupportCY170Pct>0.49810</PublicSupportCY170Pct>
      <PublicSupportPY170Pct>0.47470</PublicSupportPY170Pct>
      <ThirtyThrPctSuprtTestsCY170Ind>X</ThirtyThrPctSuprtTestsCY170Ind>
    </IRS990ScheduleA>
    <IRS990ScheduleB documentId="RetDoc1234500001" />
    <IRS990ScheduleD documentId="RetDoc1040000001">
      <LandGrp>
        <OtherCostOrOtherBasisAmt>165000</OtherCostOrOtherBasisAmt>
        <BookValueAmt>165000</BookValueAmt>
      </LandGrp>
      <BuildingsGrp>
        <OtherCostOrOtherBasisAmt>12957779</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>339039</DepreciationAmt>
        <BookValueAmt>12618740</BookValueAmt>
      </BuildingsGrp>
      <TotalBookValueLandBuildingsAmt>12783740</TotalBookValueLandBuildingsAmt>
      <OtherAssetsOrgGrp>
        <Desc>Bonds receivable</Desc>
        <BookValueAmt>55741599</BookValueAmt>
      </OtherAssetsOrgGrp>
      <OtherAssetsOrgGrp>
        <Desc>Due from related parties</Desc>
        <BookValueAmt>12522</BookValueAmt>
      </OtherAssetsOrgGrp>
      <TotalBookValueOtherAssetsAmt>55754121</TotalBookValueOtherAssetsAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>Interest payable</Desc>
        <Amt>945334</Amt>
      </OtherLiabilitiesOrgGrp>
      <TotalLiabilityAmt>945334</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <TotalRevEtcAuditedFinclStmtAmt>17632716</TotalRevEtcAuditedFinclStmtAmt>
      <DonatedServicesAndUseFcltsAmt>394890</DonatedServicesAndUseFcltsAmt>
      <OtherRevenueAmt>131475</OtherRevenueAmt>
      <RevenueNotReportedAmt>526365</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>17106351</RevenueSubtotalAmt>
      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
      <TotalRevenuePerForm990Amt>17106351</TotalRevenuePerForm990Amt>
      <TotExpnsEtcAuditedFinclStmtAmt>8832014</TotExpnsEtcAuditedFinclStmtAmt>
      <DonatedServicesUseFcltsAmt>394890</DonatedServicesUseFcltsAmt>
      <OtherExpensesIncludedAmt>131475</OtherExpensesIncludedAmt>
      <ExpensesNotReportedAmt>526365</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>8305649</ExpensesSubtotalAmt>
      <ExpensesNotRptFinclStmtAmt>0</ExpensesNotRptFinclStmtAmt>
      <TotalExpensesPerForm990Amt>8305649</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part X, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization accounts for uncertainty in income taxes in accordance with ASC Topic, Income Taxes. This standard clarifies the accounting for uncertainty in tax positions and prescribes a recognition threshold and measurement attribute for the consolidated financial statements regarding a tax position taken or expected to be taken in a tax return. The Organization has determined that there are no uncertain tax positions which qualify for either recognition or disclosure in the consolidated financial statements at June 30, 2018 and 2017. The Organization's information returns are subject to examination by Federal and state jurisdictions.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XI, Line 2d - Other Adjustments:</FormAndLineReferenceDesc>
        <ExplanationTxt>Depreciation expense deducted from rental income</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part XII, Line 2d - Other Adjustments:</FormAndLineReferenceDesc>
        <ExplanationTxt>Depreciation on Form 990 is reported net of rental income</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleD>
    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>1</GrantRecordsMaintainedInd>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Mastery Charter High School</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>35 South 4th Street</AddressLine1Txt>
          <CityNm>Philadelphia</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19106</ZIPCd>
        </USAddress>
        <RecipientEIN>233060542</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>2593182</CashGrantAmt>
        <PurposeOfGrantTxt>Charter school support, development and expansion</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Mastery Charter School - Thomas Campus</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>927 Johnson Street</AddressLine1Txt>
          <CityNm>Philadelphia</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19148</ZIPCd>
        </USAddress>
        <RecipientEIN>204861191</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>70951</CashGrantAmt>
        <PurposeOfGrantTxt>Charter school support</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Mastery Charter School - Shoemaker Campus</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>5301 Media Street</AddressLine1Txt>
          <CityNm>Philadelphia</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19131</ZIPCd>
        </USAddress>
        <RecipientEIN>204861234</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>56581</CashGrantAmt>
        <PurposeOfGrantTxt>Charter school support</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Mastery Charter School - Pickett Campus</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>5700 Wayne Avenue</AddressLine1Txt>
          <CityNm>Philadelphia</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19144</ZIPCd>
        </USAddress>
        <RecipientEIN>651308951</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>43063</CashGrantAmt>
        <PurposeOfGrantTxt>Charter school support</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Mastery Charter School - Harrity Elementary</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>5601 Christian Street</AddressLine1Txt>
          <CityNm>Philadelphia</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19143</ZIPCd>
        </USAddress>
        <RecipientEIN>272575445</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>31011</CashGrantAmt>
        <PurposeOfGrantTxt>Charter school support</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Mastery Charter School - Mann Elementary</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>5376 West Berks Street</AddressLine1Txt>
          <CityNm>Philadelphia</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19131</ZIPCd>
        </USAddress>
        <RecipientEIN>272575568</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>724</CashGrantAmt>
        <PurposeOfGrantTxt>Charter school support</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Mastery Charter School - Smedley Elementary</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1790 Bridge Street</AddressLine1Txt>
          <CityNm>Philadelphia</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19124</ZIPCd>
        </USAddress>
        <RecipientEIN>272575502</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>16222</CashGrantAmt>
        <PurposeOfGrantTxt>Charter school support</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Hardy Williams Academy Charter School</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1712 South 56th Street</AddressLine1Txt>
          <CityNm>Philadelphia</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19143</ZIPCd>
        </USAddress>
        <RecipientEIN>522173268</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>37252</CashGrantAmt>
        <PurposeOfGrantTxt>Charter school support</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Mastery Charter School - Gratz Campus</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1798 West Hunting Park Avenue</AddressLine1Txt>
          <CityNm>Philadelphia</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19140</ZIPCd>
        </USAddress>
        <RecipientEIN>452107493</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>155523</CashGrantAmt>
        <PurposeOfGrantTxt>Charter school support</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Grover Cleveland Mastery Charter School</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>5650 Sprague Street</AddressLine1Txt>
          <CityNm>Philadelphia</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19138</ZIPCd>
        </USAddress>
        <RecipientEIN>462846820</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>45825</CashGrantAmt>
        <PurposeOfGrantTxt>Charter school support</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Mastery Charter Schools of Camden</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1033 Cambridge Avenue</AddressLine1Txt>
          <CityNm>Camden</CityNm>
          <StateAbbreviationCd>NJ</StateAbbreviationCd>
          <ZIPCd>08105</ZIPCd>
        </USAddress>
        <RecipientEIN>465158488</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>45500</CashGrantAmt>
        <PurposeOfGrantTxt>Charter school support</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Francis D Pastorius Mastery Charter School</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>5650 Sprague Street</AddressLine1Txt>
          <CityNm>Philadelphia</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19138</ZIPCd>
        </USAddress>
        <RecipientEIN>462846820</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>7566</CashGrantAmt>
        <PurposeOfGrantTxt>Charter school support</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Frederick Douglass Mastery Charter School</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>2118 W Norris Street</AddressLine1Txt>
          <CityNm>Philadelphia</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19121</ZIPCd>
        </USAddress>
        <RecipientEIN>800619248</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>73675</CashGrantAmt>
        <PurposeOfGrantTxt>Charter school support</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Mastery Charter School - Clymer Elementary</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1201 W Rush Street</AddressLine1Txt>
          <CityNm>Philadelphia</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19133</ZIPCd>
        </USAddress>
        <RecipientEIN>452107667</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>28684</CashGrantAmt>
        <PurposeOfGrantTxt>Charter school support</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Mastery Charter School - Wister Campus</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>67 E Bringhurst Street</AddressLine1Txt>
          <CityNm>Philadelphia</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19144</ZIPCd>
        </USAddress>
        <RecipientEIN>812713543</RecipientEIN>
        <IRCSectionDesc>501(c)(3)</IRCSectionDesc>
        <CashGrantAmt>771000</CashGrantAmt>
        <PurposeOfGrantTxt>Charter school support</PurposeOfGrantTxt>
      </RecipientTable>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>College Scholarships</GrantTypeTxt>
        <RecipientCnt>12</RecipientCnt>
        <NonCashAssistanceAmt>24000</NonCashAssistanceAmt>
        <ValuationMethodUsedDesc>Cash value</ValuationMethodUsedDesc>
      </GrantsOtherAsstToIndivInUSGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I, Line 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization grants funds only to Mastery Charter Schools and OSTC funds to qualified institutions. The Organization's shared management team monitors all grants.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 11b</FormAndLineReferenceDesc>
        <ExplanationTxt>A draft of the Form 990 to be filed is provided to the Board of Directors prior to filing. The form is filed after their review.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, line 12c</FormAndLineReferenceDesc>
        <ExplanationTxt>Board members are covered by a conflict of interest policy which is reviewed annually by the Board members.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>The Organization makes its governing documents, conflict of interest policy and financial statements available to the public upon request.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="RetDoc1043400001">
      <IdDisregardedEntitiesGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>MCSF Lender LLC</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>5700 Wayne Avenue</AddressLine1Txt>
          <CityNm>Philadelphia</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19144</ZIPCd>
        </USAddress>
        <EIN>300885141</EIN>
        <PrimaryActivitiesTxt>Holder of debt for school bldg activity</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>PA</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>Mastery Charter Schools Foundation</BusinessNameLine1Txt>
        </DirectControllingEntityName>
      </IdDisregardedEntitiesGrp>
      <IdDisregardedEntitiesGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>MCSF Lender II LLC</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>5700 Wayne Avenue</AddressLine1Txt>
          <CityNm>Philadelphia</CityNm>
          <StateAbbreviationCd>PA</StateAbbreviationCd>
          <ZIPCd>19144</ZIPCd>
        </USAddress>
        <PrimaryActivitiesTxt>Holder of debt for school bldg activity</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>PA</LegalDomicileStateCd>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>Mastery Charter Schools Foundation</BusinessNameLine1Txt>
        </DirectControllingEntityName>
      </IdDisregardedEntitiesGrp>
    </IRS990ScheduleR>
    <ReasonableCauseExplanation documentId="RetDoc2125800001">
      <ExplanationTxt>Late filed return due to CCH Software Outage.</ExplanationTxt>
    </ReasonableCauseExplanation>
  </ReturnData>
</Return>