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          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_glad_ADowngradeSuspensionOrWithdrawalOfAnyCreditRatingAssignedByARatingAgencyToUsOrTheNotesOrChangeInTheDebtMarketsCouldCauseTheLiquidityOrMarketValueOfTheNotesToDeclineSignificantlyMember" xml:lang="en-US">A downgrade, suspension or withdrawal of any credit rating assigned by a rating agency to us or the Notes or change in the debt markets could cause the liquidity or market value of the Notes to decline significantly [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_glad_ADowngradeSuspensionOrWithdrawalOfAnyCreditRatingAssignedByARatingAgencyToUsOrTheNotesOrChangeInTheDebtMarketsCouldCauseTheLiquidityOrMarketValueOfTheNotesToDeclineSignificantlyMember" xlink:to="lab_glad_ADowngradeSuspensionOrWithdrawalOfAnyCreditRatingAssignedByARatingAgencyToUsOrTheNotesOrChangeInTheDebtMarketsCouldCauseTheLiquidityOrMarketValueOfTheNotesToDeclineSignificantlyMember" />
          <link:loc xlink:type="locator" xlink:href="glad-20260603.xsd#glad_IfWeDefaultOnOurObligationsToPayOurOtherIndebtednessWeMayNotBeAbleToMakePaymentsOnTheNotesMember" xlink:label="loc_glad_IfWeDefaultOnOurObligationsToPayOurOtherIndebtednessWeMayNotBeAbleToMakePaymentsOnTheNotesMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_glad_IfWeDefaultOnOurObligationsToPayOurOtherIndebtednessWeMayNotBeAbleToMakePaymentsOnTheNotesMember" xml:lang="en-US">If we default on our obligations to pay our other indebtedness, we may not be able to make payments on the Notes [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_glad_IfWeDefaultOnOurObligationsToPayOurOtherIndebtednessWeMayNotBeAbleToMakePaymentsOnTheNotesMember" xlink:to="lab_glad_IfWeDefaultOnOurObligationsToPayOurOtherIndebtednessWeMayNotBeAbleToMakePaymentsOnTheNotesMember" />
          <link:loc xlink:type="locator" xlink:href="glad-20260603.xsd#glad_OurManagementWillHaveBroadDiscretionInTheUseOfTheNetProceedsFromThisOfferingAndMayAllocateTheNetProceedsFromThisOfferingInWaysThatYouAndOtherSecurityholdersMayNotApproveMember" xlink:label="loc_glad_OurManagementWillHaveBroadDiscretionInTheUseOfTheNetProceedsFromThisOfferingAndMayAllocateTheNetProceedsFromThisOfferingInWaysThatYouAndOtherSecurityholdersMayNotApproveMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_glad_OurManagementWillHaveBroadDiscretionInTheUseOfTheNetProceedsFromThisOfferingAndMayAllocateTheNetProceedsFromThisOfferingInWaysThatYouAndOtherSecurityholdersMayNotApproveMember" xml:lang="en-US">Our management will have broad discretion in the use of the net proceeds from this offering and may allocate the net proceeds from this offering in ways that you and other securityholders may not approve [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_glad_OurManagementWillHaveBroadDiscretionInTheUseOfTheNetProceedsFromThisOfferingAndMayAllocateTheNetProceedsFromThisOfferingInWaysThatYouAndOtherSecurityholdersMayNotApproveMember" xlink:to="lab_glad_OurManagementWillHaveBroadDiscretionInTheUseOfTheNetProceedsFromThisOfferingAndMayAllocateTheNetProceedsFromThisOfferingInWaysThatYouAndOtherSecurityholdersMayNotApproveMember" />
          <link:loc xlink:type="locator" xlink:href="glad-20260603.xsd#glad_TheIndentureUnderWhichTheNotesWillBeIssuedWillContainLimitedProtectionForHoldersOfTheNotesMember" xlink:label="loc_glad_TheIndentureUnderWhichTheNotesWillBeIssuedWillContainLimitedProtectionForHoldersOfTheNotesMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_glad_TheIndentureUnderWhichTheNotesWillBeIssuedWillContainLimitedProtectionForHoldersOfTheNotesMember" xml:lang="en-US">The indenture under which the Notes will be issued will contain limited protection for holders of the Notes [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_glad_TheIndentureUnderWhichTheNotesWillBeIssuedWillContainLimitedProtectionForHoldersOfTheNotesMember" xlink:to="lab_glad_TheIndentureUnderWhichTheNotesWillBeIssuedWillContainLimitedProtectionForHoldersOfTheNotesMember" />
          <link:loc xlink:type="locator" xlink:href="glad-20260603.xsd#glad_TheNotesWillBeStructurallySubordinatedToTheIndebtednessAndOtherLiabilitiesOfOurSubsidiariesMember" xlink:label="loc_glad_TheNotesWillBeStructurallySubordinatedToTheIndebtednessAndOtherLiabilitiesOfOurSubsidiariesMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_glad_TheNotesWillBeStructurallySubordinatedToTheIndebtednessAndOtherLiabilitiesOfOurSubsidiariesMember" xml:lang="en-US">The Notes will be structurally subordinated to the indebtedness and other liabilities of our subsidiaries [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_glad_TheNotesWillBeStructurallySubordinatedToTheIndebtednessAndOtherLiabilitiesOfOurSubsidiariesMember" xlink:to="lab_glad_TheNotesWillBeStructurallySubordinatedToTheIndebtednessAndOtherLiabilitiesOfOurSubsidiariesMember" />
          <link:loc xlink:type="locator" xlink:href="glad-20260603.xsd#glad_TheNotesWillBeUnsecuredAndThereforeWillBeEffectivelySubordinatedToAnySecuredIndebtednessMember" xlink:label="loc_glad_TheNotesWillBeUnsecuredAndThereforeWillBeEffectivelySubordinatedToAnySecuredIndebtednessMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_glad_TheNotesWillBeUnsecuredAndThereforeWillBeEffectivelySubordinatedToAnySecuredIndebtednessMember" xml:lang="en-US">The Notes will be unsecured and therefore will be effectively subordinated to any secured indebtedness [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_glad_TheNotesWillBeUnsecuredAndThereforeWillBeEffectivelySubordinatedToAnySecuredIndebtednessMember" xlink:to="lab_glad_TheNotesWillBeUnsecuredAndThereforeWillBeEffectivelySubordinatedToAnySecuredIndebtednessMember" />
          <link:loc xlink:type="locator" xlink:href="glad-20260603.xsd#glad_ThereIsNoActiveTradingMarketForTheNotesIfAnActiveTradingMarketDoesNotDevelopForTheNotesYouMayNotBeAbleToSellThemMember" xlink:label="loc_glad_ThereIsNoActiveTradingMarketForTheNotesIfAnActiveTradingMarketDoesNotDevelopForTheNotesYouMayNotBeAbleToSellThemMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_glad_ThereIsNoActiveTradingMarketForTheNotesIfAnActiveTradingMarketDoesNotDevelopForTheNotesYouMayNotBeAbleToSellThemMember" xml:lang="en-US">There is no active trading market for the Notes. If an active trading market does not develop for the Notes, you may not be able to sell them. [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_glad_ThereIsNoActiveTradingMarketForTheNotesIfAnActiveTradingMarketDoesNotDevelopForTheNotesYouMayNotBeAbleToSellThemMember" xlink:to="lab_glad_ThereIsNoActiveTradingMarketForTheNotesIfAnActiveTradingMarketDoesNotDevelopForTheNotesYouMayNotBeAbleToSellThemMember" />
          <link:loc xlink:type="locator" xlink:href="glad-20260603.xsd#glad_WeMayChooseToRedeemTheNotesWhenPrevailingInterestRatesAreRelativelyLowMember" xlink:label="loc_glad_WeMayChooseToRedeemTheNotesWhenPrevailingInterestRatesAreRelativelyLowMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_glad_WeMayChooseToRedeemTheNotesWhenPrevailingInterestRatesAreRelativelyLowMember" xml:lang="en-US">We may choose to redeem the Notes when prevailing interest rates are relatively low. [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_glad_WeMayChooseToRedeemTheNotesWhenPrevailingInterestRatesAreRelativelyLowMember" xlink:to="lab_glad_WeMayChooseToRedeemTheNotesWhenPrevailingInterestRatesAreRelativelyLowMember" />
          <link:loc xlink:type="locator" xlink:href="glad-20260603.xsd#glad_WeMayNotBeAbleToRepurchaseTheNotesUponAChangeOfControlRepurchaseEventMember" xlink:label="loc_glad_WeMayNotBeAbleToRepurchaseTheNotesUponAChangeOfControlRepurchaseEventMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_glad_WeMayNotBeAbleToRepurchaseTheNotesUponAChangeOfControlRepurchaseEventMember" xml:lang="en-US">We may not be able to repurchase the Notes upon a Change of Control Repurchase Event. [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_glad_WeMayNotBeAbleToRepurchaseTheNotesUponAChangeOfControlRepurchaseEventMember" xlink:to="lab_glad_WeMayNotBeAbleToRepurchaseTheNotesUponAChangeOfControlRepurchaseEventMember" />
          <link:loc xlink:type="locator" xlink:href="glad-20260603.xsd#glad_CommonSharesMember" xlink:label="loc_glad_CommonSharesMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_glad_CommonSharesMember" xml:lang="en-US">Common Shares [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_glad_CommonSharesMember" xlink:to="lab_glad_CommonSharesMember" />
          <link:loc xlink:type="locator" xlink:href="glad-20260603.xsd#glad_FivePointEightHundredSeventyFivePercentConvertibleNotesDueTwoThousandThirtyMember" xlink:label="loc_glad_FivePointEightHundredSeventyFivePercentConvertibleNotesDueTwoThousandThirtyMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_glad_FivePointEightHundredSeventyFivePercentConvertibleNotesDueTwoThousandThirtyMember" xml:lang="en-US">5.875% Convertible Notes due 2030 [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_glad_FivePointEightHundredSeventyFivePercentConvertibleNotesDueTwoThousandThirtyMember" xlink:to="lab_glad_FivePointEightHundredSeventyFivePercentConvertibleNotesDueTwoThousandThirtyMember" />
          <link:loc xlink:type="locator" xlink:href="glad-20260603.xsd#glad_SeriesAPreferredStockOneMember" xlink:label="loc_glad_SeriesAPreferredStockOneMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_glad_SeriesAPreferredStockOneMember" xml:lang="en-US">Series A Preferred Stock [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_glad_SeriesAPreferredStockOneMember" xlink:to="lab_glad_SeriesAPreferredStockOneMember" />
          <link:loc xlink:type="locator" xlink:href="glad-20260603.xsd#glad_ThreePointSeventyFivePercentNotesDueTwentyTwentySevenMember" xlink:label="loc_glad_ThreePointSeventyFivePercentNotesDueTwentyTwentySevenMember" />
          <link:label xlink:type="resource" xlink:role="http://www.xbrl.org/2003/role/label" xlink:label="lab_glad_ThreePointSeventyFivePercentNotesDueTwentyTwentySevenMember" xml:lang="en-US">3.75% Notes due 2027 [Member]</link:label>
          <link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="loc_glad_ThreePointSeventyFivePercentNotesDueTwentyTwentySevenMember" xlink:to="lab_glad_ThreePointSeventyFivePercentNotesDueTwentyTwentySevenMember" />
        </link:labelLink>
      </link:linkbase>
    </appinfo>
  </annotation>
  <import namespace="http://www.xbrl.org/2003/instance" schemaLocation="http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd" />
  <import namespace="http://www.xbrl.org/2003/linkbase" schemaLocation="http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd" />
  <import namespace="http://xbrl.org/2005/xbrldt" schemaLocation="http://www.xbrl.org/2005/xbrldt-2005.xsd" />
  <import namespace="http://xbrl.sec.gov/dei/2025" schemaLocation="https://xbrl.sec.gov/dei/2025/dei-2025.xsd" />
  <import namespace="http://www.xbrl.org/dtr/type/2024-01-31" schemaLocation="https://www.xbrl.org/dtr/type/2024-01-31/types.xsd" />
  <import namespace="http://xbrl.sec.gov/cef/2025" schemaLocation="https://xbrl.sec.gov/cef/2025/cef-2025.xsd" />
  <import namespace="http://xbrl.sec.gov/cef-pre/2025" schemaLocation="https://xbrl.sec.gov/cef/2025/cef-2025_pre.xsd" />
  <element name="ADowngradeSuspensionOrWithdrawalOfAnyCreditRatingAssignedByARatingAgencyToUsOrTheNotesOrChangeInTheDebtMarketsCouldCauseTheLiquidityOrMarketValueOfTheNotesToDeclineSignificantlyMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="glad_ADowngradeSuspensionOrWithdrawalOfAnyCreditRatingAssignedByARatingAgencyToUsOrTheNotesOrChangeInTheDebtMarketsCouldCauseTheLiquidityOrMarketValueOfTheNotesToDeclineSignificantlyMember" substitutionGroup="xbrli:item" />
  <element name="IfWeDefaultOnOurObligationsToPayOurOtherIndebtednessWeMayNotBeAbleToMakePaymentsOnTheNotesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="glad_IfWeDefaultOnOurObligationsToPayOurOtherIndebtednessWeMayNotBeAbleToMakePaymentsOnTheNotesMember" substitutionGroup="xbrli:item" />
  <element name="OurManagementWillHaveBroadDiscretionInTheUseOfTheNetProceedsFromThisOfferingAndMayAllocateTheNetProceedsFromThisOfferingInWaysThatYouAndOtherSecurityholdersMayNotApproveMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="glad_OurManagementWillHaveBroadDiscretionInTheUseOfTheNetProceedsFromThisOfferingAndMayAllocateTheNetProceedsFromThisOfferingInWaysThatYouAndOtherSecurityholdersMayNotApproveMember" substitutionGroup="xbrli:item" />
  <element name="TheIndentureUnderWhichTheNotesWillBeIssuedWillContainLimitedProtectionForHoldersOfTheNotesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="glad_TheIndentureUnderWhichTheNotesWillBeIssuedWillContainLimitedProtectionForHoldersOfTheNotesMember" substitutionGroup="xbrli:item" />
  <element name="TheNotesWillBeStructurallySubordinatedToTheIndebtednessAndOtherLiabilitiesOfOurSubsidiariesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="glad_TheNotesWillBeStructurallySubordinatedToTheIndebtednessAndOtherLiabilitiesOfOurSubsidiariesMember" substitutionGroup="xbrli:item" />
  <element name="TheNotesWillBeUnsecuredAndThereforeWillBeEffectivelySubordinatedToAnySecuredIndebtednessMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="glad_TheNotesWillBeUnsecuredAndThereforeWillBeEffectivelySubordinatedToAnySecuredIndebtednessMember" substitutionGroup="xbrli:item" />
  <element name="ThereIsNoActiveTradingMarketForTheNotesIfAnActiveTradingMarketDoesNotDevelopForTheNotesYouMayNotBeAbleToSellThemMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="glad_ThereIsNoActiveTradingMarketForTheNotesIfAnActiveTradingMarketDoesNotDevelopForTheNotesYouMayNotBeAbleToSellThemMember" substitutionGroup="xbrli:item" />
  <element name="WeMayChooseToRedeemTheNotesWhenPrevailingInterestRatesAreRelativelyLowMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="glad_WeMayChooseToRedeemTheNotesWhenPrevailingInterestRatesAreRelativelyLowMember" substitutionGroup="xbrli:item" />
  <element name="WeMayNotBeAbleToRepurchaseTheNotesUponAChangeOfControlRepurchaseEventMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="glad_WeMayNotBeAbleToRepurchaseTheNotesUponAChangeOfControlRepurchaseEventMember" substitutionGroup="xbrli:item" />
  <element name="CommonSharesMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="glad_CommonSharesMember" substitutionGroup="xbrli:item" />
  <element name="FivePointEightHundredSeventyFivePercentConvertibleNotesDueTwoThousandThirtyMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="glad_FivePointEightHundredSeventyFivePercentConvertibleNotesDueTwoThousandThirtyMember" substitutionGroup="xbrli:item" />
  <element name="SeriesAPreferredStockOneMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="glad_SeriesAPreferredStockOneMember" substitutionGroup="xbrli:item" />
  <element name="ThreePointSeventyFivePercentNotesDueTwentyTwentySevenMember" type="dtr-types:domainItemType" abstract="true" xbrli:periodType="duration" nillable="true" id="glad_ThreePointSeventyFivePercentNotesDueTwentyTwentySevenMember" substitutionGroup="xbrli:item" />
</schema>
