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      <OtherExpensesGrp>
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          <AddressLine2>RESTRICTED</AddressLine2>
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      <FootnoteTextInd>X</FootnoteTextInd>
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      <RevenueNotReportedAmt>836627</RevenueNotReportedAmt>
      <RevenueSubtotalAmt>14860292</RevenueSubtotalAmt>
      <RevenueNotReportedFinclStmtAmt>0</RevenueNotReportedFinclStmtAmt>
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      <ExpensesNotReportedAmt>0</ExpensesNotReportedAmt>
      <ExpensesSubtotalAmt>21272520</ExpensesSubtotalAmt>
      <ExpensesNotRptFinclStmtAmt>0</ExpensesNotRptFinclStmtAmt>
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        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FOUNDATION APPLIES THE PROVISIONS SET FORTH IN FASB ACCOUNTING STANDARDS CODIFICATION (ASC) TOPIC 740, INCOME TAXES, TO ACCOUNT FOR THE UNCERTAINTY IN INCOME TAXES. THE FOUNDATION ASSESSED ALL INCOME TAX POSITIONS TAKEN WHERE THE STATUTE OF LIMITATIONS REMAINS OPEN. EXAMPLES OF THESE TAX POSITIONS INCLUDE THE FOUNDATION'S TAX-EXEMPT STATUS AND POTENTIAL SOURCES OF UBTI. THE FOUNDATION BELIEVES THAT ITS TAX FILING POSITIONS WILL BE SUSTAINED UPON TAX EXAMINATIONS; THEREFORE, NO LIABILITY FOR UNRECOGNIZED INCOME TAX BENEFITS HAS BEEN RECORDED AT DECEMBER 31, 2020 AND 2019.</ExplanationTxt>
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        <TotalCompensationFilingOrgAmt>629431</TotalCompensationFilingOrgAmt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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        <TotalCompensationFilingOrgAmt>578530</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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        <PersonNm>RIYA ABRAHAM</PersonNm>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>373641</BonusFilingOrganizationAmount>
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        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>19500</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>6636</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>517197</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
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        <ExplanationTxt>THE PRESIDENT OF SIGNAL TECHNOLOGY FOUNDATION IS NOT COMPENSATED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 7</FormAndLineReferenceDesc>
        <ExplanationTxt>A PORTION OF THE BONUS PAYMENTS REPORTED ON SCHEDULE J, PART II, COLUMN (B)(II) WOULD BE CONSIDERED A "NON-FIXED PAYMENT" AS MANAGEMENT OF THE ORGANIZATION MAY EXERCISE DISCRETION AS TO WHETHER A BONUS SHOULD BE PAID OR THE AMOUNT OF BONUS PAID. IN 2020, THE ORGANIZATION ALSO PROVIDED ANNUAL RETENTION BONUSES TO CERTAIN INDIVIDUALS (ALSO REFLECTED IN SCHEDULE J, PART II, COLUMN (B)(II)), WHICH ARE FIXED AMOUNTS OUTLINED IN AN EMPLOYMENT CONTRACT DESIGNED TO ASSIST IN THE RECRUITMENT AND RETENTION OF SOFTWARE DEVELOPERS, AS FOR-PROFIT EMPLOYERS OF SIMILAR EMPLOYEES ARE PERMITTED TO PROVIDE ADDITIONAL BENEFITS (SUCH AS STOCK INCENTIVES) NOT PERMITTED WITHIN A TAX-EXEMPT ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleL documentId="RetDoc1042800001">
      <LoansBtwnOrgInterestedPrsnGrp>
        <PersonNm>BRIAN ACTON</PersonNm>
        <RelationshipWithOrgTxt>PRESIDENT, SECRETARY, AND TREASURER</RelationshipWithOrgTxt>
        <LoanPurposeTxt>START-UP FUNDING</LoanPurposeTxt>
        <LoanToOrganizationInd>X</LoanToOrganizationInd>
        <OriginalPrincipalAmt>105000400</OriginalPrincipalAmt>
        <BalanceDueAmt>30440413</BalanceDueAmt>
        <DefaultInd>0</DefaultInd>
        <BoardOrCommitteeApprovalInd>1</BoardOrCommitteeApprovalInd>
        <WrittenAgreementInd>1</WrittenAgreementInd>
      </LoansBtwnOrgInterestedPrsnGrp>
      <TotalBalanceDueAmt>30440413</TotalBalanceDueAmt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>SCHEDULE L, PART IV:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION OBTAINED A 0% INTEREST, UNSECURED PROMISSORY NOTE FROM BRIAN ACTON (PRESIDENT, SECRETARY, AND TREASURER OF THE ORGANIZATION) WHICH IS PAYABLE ON THE 50-YEAR ANNIVERSARY OF THE DATE THE LOAN WAS ORIGINATED (FEBRUARY 28, 2018). FOR GAAP REPORTING PURPOSES, WHILE A PORTION OF THE LOAN HAS BEEN RE-CHARACTERIZED AS AN INHERENT CONTRIBUTION (AND THUS, THE LOAN ONLY REFLECTS AN END-OF-YEAR BOOK BALANCE OF $30,440,413 ON FORM 990, PART X, LINE 22 AND SCHEDULE L, PART IV, COLUMN (F)), NONE OF THE $105,000,000 ORIGINAL LOAN FACE-VALUE HAS BEEN PAID-OFF AS OF 12/31/2020.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleL>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS ONE SOLE MEMBER, BRIAN ACTON, WHO IS ALSO DIRECTOR, PRESIDENT, AND SECRETARY/TREASURER OF THE ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION'S SOLE MEMBER HAS THE EXCLUSIVE RIGHT TO ELECT ANY DIRECTOR.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MEMBER OF THE CORPORATION HAS THE FOLLOWING RIGHTS, AS SET FORTH BY THE BYLAWS: (I) THE EXCLUSIVE RIGHT TO ELECT ANY DIRECTOR AND TO SET THE NUMBER OF AUTHORIZED DIRECTORS; (II) THE RIGHT TO REMOVE A DIRECTOR; (III) THE RIGHT TO VOTE ON ANY SALE, LEASE, TRANSFER, OR OTHER DISPOSITION OF ALL OR SUBSTANTIALLY ALL OF THE ASSETS OR PROPERTIES OF THIS CORPORATION; (IV) THE RIGHT TO VOTE ON ANY MERGER OF THIS CORPORATION, BUT ONLY TO THE EXTENT REQUIRED BY THE DELAWARE GENERAL CORPORATION LAW; (V) THE RIGHT TO VOTE ON THE DISSOLUTION OF THIS CORPORATION; (VI) THE RIGHT TO VOTE ON THE AMENDMENT OR REPEAL OF THE BYLAWS; (VII) THE RIGHT TO VOTE ON ANY AMENDMENT TO THE CERTIFICATE OF INCORPORATION; AND (VIII) THE RIGHT TO VOTE ON ANY OTHER MATTERS THAT MAY PROPERLY BE PRESENTED TO THE MEMBERS FOR A VOTE, PURSUANT TO THIS CORPORATION'S CERTIFICATE OF INCORPORATION, BYLAWS, OR ACTION OF THE BOARD OF DIRECTORS, OR BY OPERATION OF LAW.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 IS PREPARED BY AN INDEPENDENT ACCOUNTANT IN CONJUNCTION WITH THE ORGANIZATION'S COO. THE COO THEN REVIEWS A DRAFT OF THE FORM 990 IN DETAIL; ADJUSTMENTS ARE MADE, AS NECESSARY. THE FORM 990 IS THEN MADE AVAILABLE TO ALL MEMBERS OF THE BOARD OF DIRECTORS PRIOR TO FILING WITH THE INTERNAL REVENUE SERVICE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL OFFICERS, MANAGEMENT, CONTRIBUTORS, OR EMPLOYEES OF SIGNAL FOUNDATION OR SIGNAL MESSENGER, LLC (A SINGLE-MEMBER LLC WHOLLY OWNED BY SIGNAL FOUNDATION AND DISREGARDED FOR FEDERAL TAX PURPOSES) ARE COVERED BY THE ORGANIZATION'S CONFLICT OF INTEREST POLICY. EACH DIRECTOR, OFFICER, AND KEY EMPLOYEE OF SIGNAL HAS RECEIVED A COPY OF THE CONFLICT OF INTEREST POLICY THAT GOVERNS SIGNAL. DISCLOSURES OF POTENTIAL CONFLICTS OF INTEREST ARE MADE TO MEMBERS OF THE BOARD OF DIRECTORS, INCLUDING ALL MATERIAL FACTS RELEVANT TO A TRANSACTION. THE BOARD, IN THE ABSENCE OF THE CONFLICTED INDIVIDUAL, DETERMINES (BY MAJORITY VOTE) WHETHER THE INTEREST CONSTITUTES A CONFLICT OF INTEREST, AND IF SO, WHETHER THE TRANSACTION IS NEVERTHELESS IN SIGNAL'S BEST INTEREST, FOR ITS OWN BENEFIT, AND FAIR AND REASONABLE TAKING INTO ACCOUNT THE RELEVANT INFORMATION AND FACTS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15B</FormAndLineReferenceDesc>
        <ExplanationTxt>FORM 990, PART VI, SECTION B, LINE 15A HAS BEEN ANSWERED "NO" AS THE PRESIDENT OF SIGNAL TECHNOLOGY FOUNDATION IS NOT COMPENSATED. SALARY SURVEYS OF COMPARABLE ORGANIZATIONS ARE PERFORMED TO DETERMINE THE COMPENSATION OF THE OTHER OFFICERS AND KEY EMPLOYEES OF THE ORGANIZATION. COMPENSATION CONTRACTS AND AGREEMENTS ARE REVIEWED ANNUALLY BY INDEPENDENT MEMBERS OF THE BOARD OF DIRECTORS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION'S FINANCIAL STATEMENTS, CONFLICT OF INTEREST POLICY, AND GOVERNING DOCUMENTS ARE AVAILABLE TO THE PUBLIC UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="RetDoc1043400001">
      <IdDisregardedEntitiesGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>SIGNAL MESSENGER LLC</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>650 CASTRO STREET SUITE 120-223</AddressLine1Txt>
          <CityNm>MOUNTAIN VIEW</CityNm>
          <StateAbbreviationCd>CA</StateAbbreviationCd>
          <ZIPCd>94041</ZIPCd>
        </USAddress>
        <EIN>824517054</EIN>
        <PrimaryActivitiesTxt>SIGNAL MESSENGER TECHNOLOGY DEVELOPMENT/SUPPORT</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>DE</LegalDomicileStateCd>
        <TotalIncomeAmt>231412</TotalIncomeAmt>
        <EndOfYearAssetsAmt>8653515</EndOfYearAssetsAmt>
        <DirectControllingEntityName>
          <BusinessNameLine1Txt>SIGNAL TECHNOLOGY FOUNDATION</BusinessNameLine1Txt>
        </DirectControllingEntityName>
      </IdDisregardedEntitiesGrp>
    </IRS990ScheduleR>
  </ReturnData>
</Return>
