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<!-- Generated by DFIN XBRL Schema Document - http://www.dfinsolutions.com/ - on 25-05-2026 06:38:20 AM -->
<!-- Copyright(c) 2026 Donnelley Financial Solutions, Inc. All Rights Reserved. -->
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					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_MaturityDomain" xlink:label="MaturityDomain"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/IndustrySectorOnly">
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_IndustrySectorDomain" xlink:label="IndustrySectorDomain"/>
					<link:loc xlink:type="locator" xlink:href="#ist_HealthCareREITsMember" xlink:label="HealthCareREITsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="HealthCareREITsMember" order="1.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ResidentialREITsMember" xlink:label="ResidentialREITsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="ResidentialREITsMember" order="2.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_SpecializedREITsMember" xlink:label="SpecializedREITsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="SpecializedREITsMember" order="3.0"/>
					<link:loc xlink:type="locator" xlink:href="#ist_MortgageREITsMember" xlink:label="MortgageREITsMember"/>
					<link:definitionArc xlink:type="arc" xlink:arcrole="http://xbrl.org/int/dim/arcrole/domain-member" xlink:from="IndustrySectorDomain" xlink:to="MortgageREITsMember" order="4.0"/>
				</link:definitionLink>
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/CreditQualityOnly">
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_CreditQualityDomain" xlink:label="CreditQualityDomain"/>
				</link:definitionLink>
				<!--GeographicRegionOnly use only for STPR-->
				<link:definitionLink xlink:type="extended" xlink:role="http://xbrl.sec.gov/oef/role/GeographicRegionOnly">
					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/oef/2025/oef-2025.xsd#oef_GeographicRegionDomain" xlink:label="GeographicRegionDomain"/>
				</link:definitionLink>
				<link:labelLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link">               
					<link:loc xlink:type="locator" xlink:href="#ist_SAndP100Member" xlink:label="SAndP100Member"/>
					<link:label xlink:type="resource" xlink:label="label_SAndP100Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">S And P 100 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SAndP100Member" xlink:to="label_SAndP100Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000012036Member" xlink:label="C000012036Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000012036Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000012036 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000012036Member" xlink:to="label_C000012036Member"/>
										<link:label xlink:type="resource" xlink:label="label_C000012036Member_2" xlink:role="http://www.xbrl.org/2003/role/terseLabel" xml:lang="en-US">Class Composite</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000012036Member" xlink:to="label_C000012036Member_2"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000012037Member" xlink:label="C000012037Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000012037Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000012037 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000012037Member" xlink:to="label_C000012037Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_SAndPMidCap400Member" xlink:label="SAndPMidCap400Member"/>
					<link:label xlink:type="resource" xlink:label="label_SAndPMidCap400Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">S And P MidCap 400 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SAndPMidCap400Member" xlink:to="label_SAndPMidCap400Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_TechnipFMCPLCMember" xlink:label="TechnipFMCPLCMember"/>
					<link:label xlink:type="resource" xlink:label="label_TechnipFMCPLCMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">TechnipFMC PLC [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="TechnipFMCPLCMember" xlink:to="label_TechnipFMCPLCMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_CaseySGeneralStoresIncMember" xlink:label="CaseySGeneralStoresIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_CaseySGeneralStoresIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Casey s General Stores Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CaseySGeneralStoresIncMember" xlink:to="label_CaseySGeneralStoresIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_UnitedTherapeuticsCorpMember" xlink:label="UnitedTherapeuticsCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_UnitedTherapeuticsCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">United Therapeutics Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="UnitedTherapeuticsCorpMember" xlink:to="label_UnitedTherapeuticsCorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_CurtissWrightCorpMember" xlink:label="CurtissWrightCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_CurtissWrightCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Curtiss Wright Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CurtissWrightCorpMember" xlink:to="label_CurtissWrightCorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_FlexLtdMember" xlink:label="FlexLtdMember"/>
					<link:label xlink:type="resource" xlink:label="label_FlexLtdMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Flex Ltd [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="FlexLtdMember" xlink:to="label_FlexLtdMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_XPOIncMember" xlink:label="XPOIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_XPOIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">XPO Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="XPOIncMember" xlink:to="label_XPOIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_WoodwardIncMember" xlink:label="WoodwardIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_WoodwardIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Woodward Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="WoodwardIncMember" xlink:to="label_WoodwardIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_RoyalGoldIncMember" xlink:label="RoyalGoldIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_RoyalGoldIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Royal Gold Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="RoyalGoldIncMember" xlink:to="label_RoyalGoldIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_USFoodsHoldingCorpMember" xlink:label="USFoodsHoldingCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_USFoodsHoldingCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">U S Foods Holding Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="USFoodsHoldingCorpMember" xlink:to="label_USFoodsHoldingCorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_BurlingtonStoresIncMember" xlink:label="BurlingtonStoresIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_BurlingtonStoresIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Burlington Stores Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BurlingtonStoresIncMember" xlink:to="label_BurlingtonStoresIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_SAndP500GrowthIndexTMMember" xlink:label="SAndP500GrowthIndexTMMember"/>
					<link:label xlink:type="resource" xlink:label="label_SAndP500GrowthIndexTMMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">S And P 500 Growth IndexTM [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SAndP500GrowthIndexTMMember" xlink:to="label_SAndP500GrowthIndexTMMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_SAndPTotalMarketIndexMember" xlink:label="SAndPTotalMarketIndexMember"/>
					<link:label xlink:type="resource" xlink:label="label_SAndPTotalMarketIndexMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">S And P Total Market Index [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SAndPTotalMarketIndexMember" xlink:to="label_SAndPTotalMarketIndexMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_EliLillyAndCoMember" xlink:label="EliLillyAndCoMember"/>
					<link:label xlink:type="resource" xlink:label="label_EliLillyAndCoMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Eli Lilly And Co [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EliLillyAndCoMember" xlink:to="label_EliLillyAndCoMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_BerkshireHathawayIncClassBMember" xlink:label="BerkshireHathawayIncClassBMember"/>
					<link:label xlink:type="resource" xlink:label="label_BerkshireHathawayIncClassBMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Berkshire Hathaway Inc Class B [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BerkshireHathawayIncClassBMember" xlink:to="label_BerkshireHathawayIncClassBMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_AmazonComIncMember" xlink:label="AmazonComIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_AmazonComIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Amazon com Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AmazonComIncMember" xlink:to="label_AmazonComIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_MetaPlatformsIncClassAMember" xlink:label="MetaPlatformsIncClassAMember"/>
					<link:label xlink:type="resource" xlink:label="label_MetaPlatformsIncClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Meta Platforms Inc Class A [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MetaPlatformsIncClassAMember" xlink:to="label_MetaPlatformsIncClassAMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_AlphabetIncClassCNVSMember" xlink:label="AlphabetIncClassCNVSMember"/>
					<link:label xlink:type="resource" xlink:label="label_AlphabetIncClassCNVSMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Alphabet Inc Class C NVS [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AlphabetIncClassCNVSMember" xlink:to="label_AlphabetIncClassCNVSMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_BroadcomIncMember" xlink:label="BroadcomIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_BroadcomIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Broadcom Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BroadcomIncMember" xlink:to="label_BroadcomIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_AlphabetIncClassAMember" xlink:label="AlphabetIncClassAMember"/>
					<link:label xlink:type="resource" xlink:label="label_AlphabetIncClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Alphabet Inc Class A [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AlphabetIncClassAMember" xlink:to="label_AlphabetIncClassAMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_AppleIncMember" xlink:label="AppleIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_AppleIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Apple Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AppleIncMember" xlink:to="label_AppleIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_MicrosoftCorpMember" xlink:label="MicrosoftCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_MicrosoftCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Microsoft Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MicrosoftCorpMember" xlink:to="label_MicrosoftCorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_NVIDIACorpMember" xlink:label="NVIDIACorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_NVIDIACorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">NVIDIA Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="NVIDIACorpMember" xlink:to="label_NVIDIACorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000012041Member" xlink:label="C000012041Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000012041Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000012041 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000012041Member" xlink:to="label_C000012041Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000012042Member" xlink:label="C000012042Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000012042Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000012042 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000012042Member" xlink:to="label_C000012042Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ExxonMobilCorpMember" xlink:label="ExxonMobilCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_ExxonMobilCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Exxon Mobil Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ExxonMobilCorpMember" xlink:to="label_ExxonMobilCorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_WalmartIncMember" xlink:label="WalmartIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_WalmartIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Walmart Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="WalmartIncMember" xlink:to="label_WalmartIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_CostcoWholesaleCorpMember" xlink:label="CostcoWholesaleCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_CostcoWholesaleCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Costco Wholesale Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CostcoWholesaleCorpMember" xlink:to="label_CostcoWholesaleCorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ChevronCorpMember" xlink:label="ChevronCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_ChevronCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Chevron Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ChevronCorpMember" xlink:to="label_ChevronCorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ProcterAndGambleCoTheMember" xlink:label="ProcterAndGambleCoTheMember"/>
					<link:label xlink:type="resource" xlink:label="label_ProcterAndGambleCoTheMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Procter And Gamble Co The [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ProcterAndGambleCoTheMember" xlink:to="label_ProcterAndGambleCoTheMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_HomeDepotIncTheMember" xlink:label="HomeDepotIncTheMember"/>
					<link:label xlink:type="resource" xlink:label="label_HomeDepotIncTheMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Home Depot Inc The [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="HomeDepotIncTheMember" xlink:to="label_HomeDepotIncTheMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_BankOfAmericaCorpMember" xlink:label="BankOfAmericaCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_BankOfAmericaCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Bank of America Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BankOfAmericaCorpMember" xlink:to="label_BankOfAmericaCorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_SAndP500ValueIndexTMMember" xlink:label="SAndP500ValueIndexTMMember"/>
					<link:label xlink:type="resource" xlink:label="label_SAndP500ValueIndexTMMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">S And P 500 Value IndexTM [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SAndP500ValueIndexTMMember" xlink:to="label_SAndP500ValueIndexTMMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_CelaneseCorpClassAMember" xlink:label="CelaneseCorpClassAMember"/>
					<link:label xlink:type="resource" xlink:label="label_CelaneseCorpClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Celanese Corp Class A [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CelaneseCorpClassAMember" xlink:to="label_CelaneseCorpClassAMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_MatchGroupIncMember" xlink:label="MatchGroupIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_MatchGroupIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Match Group Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MatchGroupIncMember" xlink:to="label_MatchGroupIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ESCOTechnologiesIncMember" xlink:label="ESCOTechnologiesIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_ESCOTechnologiesIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">ESCO Technologies Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ESCOTechnologiesIncMember" xlink:to="label_ESCOTechnologiesIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_LKQCorpMember" xlink:label="LKQCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_LKQCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">LKQ Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="LKQCorpMember" xlink:to="label_LKQCorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_FormFactorIncMember" xlink:label="FormFactorIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_FormFactorIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">FormFactor Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="FormFactorIncMember" xlink:to="label_FormFactorIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ArganIncMember" xlink:label="ArganIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_ArganIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Argan Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ArganIncMember" xlink:to="label_ArganIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ViaviSolutionsIncMember" xlink:label="ViaviSolutionsIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_ViaviSolutionsIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Viavi Solutions Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ViaviSolutionsIncMember" xlink:to="label_ViaviSolutionsIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_PrimorisServicesCorpMember" xlink:label="PrimorisServicesCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_PrimorisServicesCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Primoris Services Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="PrimorisServicesCorpMember" xlink:to="label_PrimorisServicesCorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ElementSolutionsIncMember" xlink:label="ElementSolutionsIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_ElementSolutionsIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Element Solutions Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ElementSolutionsIncMember" xlink:to="label_ElementSolutionsIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_EastmanChemicalCoMember" xlink:label="EastmanChemicalCoMember"/>
					<link:label xlink:type="resource" xlink:label="label_EastmanChemicalCoMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Eastman Chemical Co [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EastmanChemicalCoMember" xlink:to="label_EastmanChemicalCoMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_SAndPSmallCap600Member" xlink:label="SAndPSmallCap600Member"/>
					<link:label xlink:type="resource" xlink:label="label_SAndPSmallCap600Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">S And P SmallCap 600 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SAndPSmallCap600Member" xlink:to="label_SAndPSmallCap600Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000012043Member" xlink:label="C000012043Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000012043Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000012043 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000012043Member" xlink:to="label_C000012043Member"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_RealEstateSectorMember" xlink:label="RealEstateSectorMember"/>
					<link:label xlink:type="resource" xlink:label="label_RealEstateSectorMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Real Estate Sector [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="RealEstateSectorMember" xlink:to="label_RealEstateSectorMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_HealthcareSectorMember" xlink:label="HealthcareSectorMember"/>
					<link:label xlink:type="resource" xlink:label="label_HealthcareSectorMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Healthcare Sector [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="HealthcareSectorMember" xlink:to="label_HealthcareSectorMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_FinancialServicesSectorMember" xlink:label="FinancialServicesSectorMember"/>
					<link:label xlink:type="resource" xlink:label="label_FinancialServicesSectorMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Financial Services Sector [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="FinancialServicesSectorMember" xlink:to="label_FinancialServicesSectorMember"/>
					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_EnergySectorMember" xlink:label="EnergySectorMember"/>
					<link:label xlink:type="resource" xlink:label="label_EnergySectorMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Energy Sector [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EnergySectorMember" xlink:to="label_EnergySectorMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000012046Member" xlink:label="C000012046Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000012046Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000012046 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000012046Member" xlink:to="label_C000012046Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_SAndPSmallCap600ValueIndexTMMember" xlink:label="SAndPSmallCap600ValueIndexTMMember"/>
					<link:label xlink:type="resource" xlink:label="label_SAndPSmallCap600ValueIndexTMMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">S And P SmallCap 600 Value IndexTM [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SAndPSmallCap600ValueIndexTMMember" xlink:to="label_SAndPSmallCap600ValueIndexTMMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_SMEnergyCoMember" xlink:label="SMEnergyCoMember"/>
					<link:label xlink:type="resource" xlink:label="label_SMEnergyCoMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">SM Energy Co [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SMEnergyCoMember" xlink:to="label_SMEnergyCoMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_MolinaHealthcareIncMember" xlink:label="MolinaHealthcareIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_MolinaHealthcareIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Molina Healthcare Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MolinaHealthcareIncMember" xlink:to="label_MolinaHealthcareIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_PaycomSoftwareIncMember" xlink:label="PaycomSoftwareIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_PaycomSoftwareIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Paycom Software Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="PaycomSoftwareIncMember" xlink:to="label_PaycomSoftwareIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_CarMaxIncMember" xlink:label="CarMaxIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_CarMaxIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">CarMax Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CarMaxIncMember" xlink:to="label_CarMaxIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_LambWestonHoldingsIncMember" xlink:label="LambWestonHoldingsIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_LambWestonHoldingsIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Lamb Weston Holdings Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="LambWestonHoldingsIncMember" xlink:to="label_LambWestonHoldingsIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_MagnoliaOilAndGasCorpClassAMember" xlink:label="MagnoliaOilAndGasCorpClassAMember"/>
					<link:label xlink:type="resource" xlink:label="label_MagnoliaOilAndGasCorpClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Magnolia Oil And Gas Corp Class A [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MagnoliaOilAndGasCorpClassAMember" xlink:to="label_MagnoliaOilAndGasCorpClassAMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_RussellMidCapValueIndexMember" xlink:label="RussellMidCapValueIndexMember"/>
					<link:label xlink:type="resource" xlink:label="label_RussellMidCapValueIndexMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Russell MidCap Value Index [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="RussellMidCapValueIndexMember" xlink:to="label_RussellMidCapValueIndexMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_Russell3000IndexMember" xlink:label="Russell3000IndexMember"/>
					<link:label xlink:type="resource" xlink:label="label_Russell3000IndexMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Russell 3000 Index [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="Russell3000IndexMember" xlink:to="label_Russell3000IndexMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_L3HarrisTechnologiesIncMember" xlink:label="L3HarrisTechnologiesIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_L3HarrisTechnologiesIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">L3Harris Technologies Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="L3HarrisTechnologiesIncMember" xlink:to="label_L3HarrisTechnologiesIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_KinderMorganIncMember" xlink:label="KinderMorganIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_KinderMorganIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Kinder Morgan Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="KinderMorganIncMember" xlink:to="label_KinderMorganIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_Phillips66Member" xlink:label="Phillips66Member"/>
					<link:label xlink:type="resource" xlink:label="label_Phillips66Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Phillips 66 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="Phillips66Member" xlink:to="label_Phillips66Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_MarathonPetroleumCorpMember" xlink:label="MarathonPetroleumCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_MarathonPetroleumCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Marathon Petroleum Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MarathonPetroleumCorpMember" xlink:to="label_MarathonPetroleumCorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_CumminsIncMember" xlink:label="CumminsIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_CumminsIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Cummins Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CumminsIncMember" xlink:to="label_CumminsIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ValeroEnergyCorpMember" xlink:label="ValeroEnergyCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_ValeroEnergyCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Valero Energy Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ValeroEnergyCorpMember" xlink:to="label_ValeroEnergyCorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_BankOfNewYorkMellonCorpTheMember" xlink:label="BankOfNewYorkMellonCorpTheMember"/>
					<link:label xlink:type="resource" xlink:label="label_BankOfNewYorkMellonCorpTheMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Bank of New York Mellon Corp The [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BankOfNewYorkMellonCorpTheMember" xlink:to="label_BankOfNewYorkMellonCorpTheMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_SandiskCorpMember" xlink:label="SandiskCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_SandiskCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Sandisk Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SandiskCorpMember" xlink:to="label_SandiskCorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_WesternDigitalCorpMember" xlink:label="WesternDigitalCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_WesternDigitalCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Western Digital Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="WesternDigitalCorpMember" xlink:to="label_WesternDigitalCorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_CorningIncMember" xlink:label="CorningIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_CorningIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Corning Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CorningIncMember" xlink:to="label_CorningIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000012065Member" xlink:label="C000012065Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000012065Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000012065 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000012065Member" xlink:to="label_C000012065Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000012069Member" xlink:label="C000012069Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000012069Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000012069 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000012069Member" xlink:to="label_C000012069Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_TeslaIncMember" xlink:label="TeslaIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_TeslaIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Tesla Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="TeslaIncMember" xlink:to="label_TeslaIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_SAndP900ValueIndexTMSplicedMember" xlink:label="SAndP900ValueIndexTMSplicedMember"/>
					<link:label xlink:type="resource" xlink:label="label_SAndP900ValueIndexTMSplicedMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">S And P 900 Value IndexTM Spliced [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SAndP900ValueIndexTMSplicedMember" xlink:to="label_SAndP900ValueIndexTMSplicedMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_SAndP900GrowthIndexTMSplicedMember" xlink:label="SAndP900GrowthIndexTMSplicedMember"/>
					<link:label xlink:type="resource" xlink:label="label_SAndP900GrowthIndexTMSplicedMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">S And P 900 Growth IndexTM Spliced [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SAndP900GrowthIndexTMSplicedMember" xlink:to="label_SAndP900GrowthIndexTMSplicedMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000012070Member" xlink:label="C000012070Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000012070Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000012070 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000012070Member" xlink:to="label_C000012070Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000012071Member" xlink:label="C000012071Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000012071Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000012071 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000012071Member" xlink:to="label_C000012071Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_BankOfAmericaCorpSeriesLNVSMember" xlink:label="BankOfAmericaCorpSeriesLNVSMember"/>
					<link:label xlink:type="resource" xlink:label="label_BankOfAmericaCorpSeriesLNVSMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Bank of America Corp Series L NVS [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BankOfAmericaCorpSeriesLNVSMember" xlink:to="label_BankOfAmericaCorpSeriesLNVSMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ICEExchangeListedPreferredAndHybridSecuritiesIndexSplicedMember" xlink:label="ICEExchangeListedPreferredAndHybridSecuritiesIndexSplicedMember"/>
					<link:label xlink:type="resource" xlink:label="label_ICEExchangeListedPreferredAndHybridSecuritiesIndexSplicedMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">ICE Exchange Listed Preferred And Hybrid Securities Index Spliced [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ICEExchangeListedPreferredAndHybridSecuritiesIndexSplicedMember" xlink:to="label_ICEExchangeListedPreferredAndHybridSecuritiesIndexSplicedMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_MSCIUSAIndexMember" xlink:label="MSCIUSAIndexMember"/>
					<link:label xlink:type="resource" xlink:label="label_MSCIUSAIndexMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">MSCI USA Index [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MSCIUSAIndexMember" xlink:to="label_MSCIUSAIndexMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_KKRAndCoIncSeriesDMember" xlink:label="KKRAndCoIncSeriesDMember"/>
					<link:label xlink:type="resource" xlink:label="label_KKRAndCoIncSeriesDMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">KKR And Co Inc Series D [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="KKRAndCoIncSeriesDMember" xlink:to="label_KKRAndCoIncSeriesDMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_NextEraEnergyIncLargestHoldingsMember" xlink:label="NextEraEnergyIncLargestHoldingsMember"/>
					<link:label xlink:type="resource" xlink:label="label_NextEraEnergyIncLargestHoldingsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">NextEra Energy Inc Largest Holdings [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="NextEraEnergyIncLargestHoldingsMember" xlink:to="label_NextEraEnergyIncLargestHoldingsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_NextEraEnergyIncMember" xlink:label="NextEraEnergyIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_NextEraEnergyIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">NextEra Energy Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="NextEraEnergyIncMember" xlink:to="label_NextEraEnergyIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_CitigroupCapitalXIII3MoCMETermSOFR6632NVSMember" xlink:label="CitigroupCapitalXIII3MoCMETermSOFR6632NVSMember"/>
					<link:label xlink:type="resource" xlink:label="label_CitigroupCapitalXIII3MoCMETermSOFR6632NVSMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Citigroup Capital XIII 3 mo CME Term SOFR 6 632 NVS [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="CitigroupCapitalXIII3MoCMETermSOFR6632NVSMember" xlink:to="label_CitigroupCapitalXIII3MoCMETermSOFR6632NVSMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_AlbemarleCorpNVSMember" xlink:label="AlbemarleCorpNVSMember"/>
					<link:label xlink:type="resource" xlink:label="label_AlbemarleCorpNVSMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Albemarle Corp NVS [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AlbemarleCorpNVSMember" xlink:to="label_AlbemarleCorpNVSMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_OracleCorpSeriesDNVSMember" xlink:label="OracleCorpSeriesDNVSMember"/>
					<link:label xlink:type="resource" xlink:label="label_OracleCorpSeriesDNVSMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Oracle Corp Series D NVS [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="OracleCorpSeriesDNVSMember" xlink:to="label_OracleCorpSeriesDNVSMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_WellsFargoAndCoSeriesLNVSMember" xlink:label="WellsFargoAndCoSeriesLNVSMember"/>
					<link:label xlink:type="resource" xlink:label="label_WellsFargoAndCoSeriesLNVSMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Wells Fargo And Co Series L NVS [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="WellsFargoAndCoSeriesLNVSMember" xlink:to="label_WellsFargoAndCoSeriesLNVSMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_StrategyIncSeriesANVSMember" xlink:label="StrategyIncSeriesANVSMember"/>
					<link:label xlink:type="resource" xlink:label="label_StrategyIncSeriesANVSMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Strategy Inc Series A NVS [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="StrategyIncSeriesANVSMember" xlink:to="label_StrategyIncSeriesANVSMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_BoeingCoTheMember" xlink:label="BoeingCoTheMember"/>
					<link:label xlink:type="resource" xlink:label="label_BoeingCoTheMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Boeing Co The [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BoeingCoTheMember" xlink:to="label_BoeingCoTheMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000036528Member" xlink:label="C000036528Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000036528Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000036528 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000036528Member" xlink:to="label_C000036528Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000042584Member" xlink:label="C000042584Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000042584Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000042584 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000042584Member" xlink:to="label_C000042584Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_FTSENareitAllResidentialCappedIndexMember" xlink:label="FTSENareitAllResidentialCappedIndexMember"/>
					<link:label xlink:type="resource" xlink:label="label_FTSENareitAllResidentialCappedIndexMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">FTSE Nareit All Residential Capped Index [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="FTSENareitAllResidentialCappedIndexMember" xlink:to="label_FTSENareitAllResidentialCappedIndexMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_WelltowerIncMember" xlink:label="WelltowerIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_WelltowerIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Welltower Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="WelltowerIncMember" xlink:to="label_WelltowerIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_PublicStorageMember" xlink:label="PublicStorageMember"/>
					<link:label xlink:type="resource" xlink:label="label_PublicStorageMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Public Storage [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="PublicStorageMember" xlink:to="label_PublicStorageMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_VentasIncMember" xlink:label="VentasIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_VentasIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Ventas Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="VentasIncMember" xlink:to="label_VentasIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ExtraSpaceStorageIncMember" xlink:label="ExtraSpaceStorageIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_ExtraSpaceStorageIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Extra Space Storage Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ExtraSpaceStorageIncMember" xlink:to="label_ExtraSpaceStorageIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_EquityResidentialMember" xlink:label="EquityResidentialMember"/>
					<link:label xlink:type="resource" xlink:label="label_EquityResidentialMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Equity Residential [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EquityResidentialMember" xlink:to="label_EquityResidentialMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_AvalonBayCommunitiesIncMember" xlink:label="AvalonBayCommunitiesIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_AvalonBayCommunitiesIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">AvalonBay Communities Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AvalonBayCommunitiesIncMember" xlink:to="label_AvalonBayCommunitiesIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_SunCommunitiesIncMember" xlink:label="SunCommunitiesIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_SunCommunitiesIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Sun Communities Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SunCommunitiesIncMember" xlink:to="label_SunCommunitiesIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_EssexPropertyTrustIncMember" xlink:label="EssexPropertyTrustIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_EssexPropertyTrustIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Essex Property Trust Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EssexPropertyTrustIncMember" xlink:to="label_EssexPropertyTrustIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_InvitationHomesIncMember" xlink:label="InvitationHomesIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_InvitationHomesIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Invitation Homes Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="InvitationHomesIncMember" xlink:to="label_InvitationHomesIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_MidAmericaApartmentCommunitiesIncMember" xlink:label="MidAmericaApartmentCommunitiesIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_MidAmericaApartmentCommunitiesIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Mid America Apartment Communities Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MidAmericaApartmentCommunitiesIncMember" xlink:to="label_MidAmericaApartmentCommunitiesIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_HealthCareREITsMember" xlink:label="HealthCareREITsMember"/>
					<link:label xlink:type="resource" xlink:label="label_HealthCareREITsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Health Care REITs [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="HealthCareREITsMember" xlink:to="label_HealthCareREITsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ResidentialREITsMember" xlink:label="ResidentialREITsMember"/>
					<link:label xlink:type="resource" xlink:label="label_ResidentialREITsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Residential REITs [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ResidentialREITsMember" xlink:to="label_ResidentialREITsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_SpecializedREITsMember" xlink:label="SpecializedREITsMember"/>
					<link:label xlink:type="resource" xlink:label="label_SpecializedREITsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Specialized REITs [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SpecializedREITsMember" xlink:to="label_SpecializedREITsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_MortgageREITsMember" xlink:label="MortgageREITsMember"/>
					<link:label xlink:type="resource" xlink:label="label_MortgageREITsMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Mortgage REITs [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MortgageREITsMember" xlink:to="label_MortgageREITsMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_EllingtonFinancialIncMember" xlink:label="EllingtonFinancialIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_EllingtonFinancialIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Ellington Financial Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="EllingtonFinancialIncMember" xlink:to="label_EllingtonFinancialIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ApolloCommercialRealEstateFinanceIncMember" xlink:label="ApolloCommercialRealEstateFinanceIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_ApolloCommercialRealEstateFinanceIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Apollo Commercial Real Estate Finance Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ApolloCommercialRealEstateFinanceIncMember" xlink:to="label_ApolloCommercialRealEstateFinanceIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ArborRealtyTrustIncMember" xlink:label="ArborRealtyTrustIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_ArborRealtyTrustIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Arbor Realty Trust Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ArborRealtyTrustIncMember" xlink:to="label_ArborRealtyTrustIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ARMOURResidentialREITIncMember" xlink:label="ARMOURResidentialREITIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_ARMOURResidentialREITIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">ARMOUR Residential REIT Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="ARMOURResidentialREITIncMember" xlink:to="label_ARMOURResidentialREITIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_DynexCapitalIncMember" xlink:label="DynexCapitalIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_DynexCapitalIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Dynex Capital Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="DynexCapitalIncMember" xlink:to="label_DynexCapitalIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_RithmCapitalCorpMember" xlink:label="RithmCapitalCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_RithmCapitalCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Rithm Capital Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="RithmCapitalCorpMember" xlink:to="label_RithmCapitalCorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_BlackstoneMortgageTrustIncClassAMember" xlink:label="BlackstoneMortgageTrustIncClassAMember"/>
					<link:label xlink:type="resource" xlink:label="label_BlackstoneMortgageTrustIncClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Blackstone Mortgage Trust Inc Class A [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="BlackstoneMortgageTrustIncClassAMember" xlink:to="label_BlackstoneMortgageTrustIncClassAMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_StarwoodPropertyTrustIncMember" xlink:label="StarwoodPropertyTrustIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_StarwoodPropertyTrustIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Starwood Property Trust Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="StarwoodPropertyTrustIncMember" xlink:to="label_StarwoodPropertyTrustIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_AGNCInvestmentCorpMember" xlink:label="AGNCInvestmentCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_AGNCInvestmentCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">AGNC Investment Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AGNCInvestmentCorpMember" xlink:to="label_AGNCInvestmentCorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_AnnalyCapitalManagementIncMember" xlink:label="AnnalyCapitalManagementIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_AnnalyCapitalManagementIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Annaly Capital Management Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="AnnalyCapitalManagementIncMember" xlink:to="label_AnnalyCapitalManagementIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_FTSENareitAllMortgageCappedIndexMember" xlink:label="FTSENareitAllMortgageCappedIndexMember"/>
					<link:label xlink:type="resource" xlink:label="label_FTSENareitAllMortgageCappedIndexMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">FTSE Nareit All Mortgage Capped Index [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="FTSENareitAllMortgageCappedIndexMember" xlink:to="label_FTSENareitAllMortgageCappedIndexMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000042587Member" xlink:label="C000042587Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000042587Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000042587 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000042587Member" xlink:to="label_C000042587Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000079751Member" xlink:label="C000079751Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000079751Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000079751 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000079751Member" xlink:to="label_C000079751Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_RussellTop200GrowthIndexMember" xlink:label="RussellTop200GrowthIndexMember"/>
					<link:label xlink:type="resource" xlink:label="label_RussellTop200GrowthIndexMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Russell Top 200 Growth Index [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="RussellTop200GrowthIndexMember" xlink:to="label_RussellTop200GrowthIndexMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_RussellTop200IndexMember" xlink:label="RussellTop200IndexMember"/>
					<link:label xlink:type="resource" xlink:label="label_RussellTop200IndexMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Russell Top 200 Index [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="RussellTop200IndexMember" xlink:to="label_RussellTop200IndexMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000079752Member" xlink:label="C000079752Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000079752Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000079752 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000079752Member" xlink:to="label_C000079752Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_C000079753Member" xlink:label="C000079753Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000079753Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000079753 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000079753Member" xlink:to="label_C000079753Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_JPMorganChaseAndCoMember" xlink:label="JPMorganChaseAndCoMember"/>
					<link:label xlink:type="resource" xlink:label="label_JPMorganChaseAndCoMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">JPMorgan Chase And Co [Member]</link:label>
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					<link:loc xlink:type="locator" xlink:href="#ist_JohnsonAndJohnsonMember" xlink:label="JohnsonAndJohnsonMember"/>
					<link:label xlink:type="resource" xlink:label="label_JohnsonAndJohnsonMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Johnson And Johnson [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="JohnsonAndJohnsonMember" xlink:to="label_JohnsonAndJohnsonMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_MicronTechnologyIncMember" xlink:label="MicronTechnologyIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_MicronTechnologyIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Micron Technology Inc [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="MicronTechnologyIncMember" xlink:to="label_MicronTechnologyIncMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_RussellTop200ValueIndexMember" xlink:label="RussellTop200ValueIndexMember"/>
					<link:label xlink:type="resource" xlink:label="label_RussellTop200ValueIndexMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Russell Top 200 Value Index [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="RussellTop200ValueIndexMember" xlink:to="label_RussellTop200ValueIndexMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_MSCIUSAQualityGARPSelectIndexSplicedMember" xlink:label="MSCIUSAQualityGARPSelectIndexSplicedMember"/>
					<link:label xlink:type="resource" xlink:label="label_MSCIUSAQualityGARPSelectIndexSplicedMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">MSCI USA Quality GARP Select Index Spliced [Member]</link:label>
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					<link:loc xlink:type="locator" xlink:href="#ist_AmphenolCorpClassAMember" xlink:label="AmphenolCorpClassAMember"/>
					<link:label xlink:type="resource" xlink:label="label_AmphenolCorpClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Amphenol Corp Class A [Member]</link:label>
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					<link:label xlink:type="resource" xlink:label="label_KLACorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">KLA Corp [Member]</link:label>
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					<link:loc xlink:type="locator" xlink:href="#ist_VisaIncClassAMember" xlink:label="VisaIncClassAMember"/>
					<link:label xlink:type="resource" xlink:label="label_VisaIncClassAMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Visa Inc Class A [Member]</link:label>
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					<link:loc xlink:type="locator" xlink:href="#ist_LamResearchCorpMember" xlink:label="LamResearchCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_LamResearchCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Lam Research Corp [Member]</link:label>
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					<link:loc xlink:type="locator" xlink:href="#ist_C000215209Member" xlink:label="C000215209Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000215209Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000215209 [Member]</link:label>
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					<link:loc xlink:type="locator" xlink:href="#ist_C000221870Member" xlink:label="C000221870Member"/>
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					<link:loc xlink:type="locator" xlink:href="#ist_SAndP500SustainabilityScreenedIndexMember" xlink:label="SAndP500SustainabilityScreenedIndexMember"/>
					<link:label xlink:type="resource" xlink:label="label_SAndP500SustainabilityScreenedIndexMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">S And P 500 Sustainability Screened Index [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SAndP500SustainabilityScreenedIndexMember" xlink:to="label_SAndP500SustainabilityScreenedIndexMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_SAndPTotalMarketC000221871IndexMember" xlink:label="SAndPTotalMarketC000221871IndexMember"/>
					<link:label xlink:type="resource" xlink:label="label_SAndPTotalMarketC000221871IndexMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">S And P Total Market C000221871 Index [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SAndPTotalMarketC000221871IndexMember" xlink:to="label_SAndPTotalMarketC000221871IndexMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_SAndPMidCap400SustainabilityScreenedIndexMember" xlink:label="SAndPMidCap400SustainabilityScreenedIndexMember"/>
					<link:label xlink:type="resource" xlink:label="label_SAndPMidCap400SustainabilityScreenedIndexMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">S And P MidCap 400 Sustainability Screened Index [Member]</link:label>
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					<link:loc xlink:type="locator" xlink:href="#ist_C000221871Member" xlink:label="C000221871Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000221871Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000221871 [Member]</link:label>
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					<link:loc xlink:type="locator" xlink:href="#ist_C000221874Member" xlink:label="C000221874Member"/>
					<link:label xlink:type="resource" xlink:label="label_C000221874Member" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">C000221874 [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="C000221874Member" xlink:to="label_C000221874Member"/>
					<link:loc xlink:type="locator" xlink:href="#ist_SAndPSmallCap600SustainabilityScreenedIndexMember" xlink:label="SAndPSmallCap600SustainabilityScreenedIndexMember"/>
					<link:label xlink:type="resource" xlink:label="label_SAndPSmallCap600SustainabilityScreenedIndexMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">S And P SmallCap 600 Sustainability Screened Index [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SAndPSmallCap600SustainabilityScreenedIndexMember" xlink:to="label_SAndPSmallCap600SustainabilityScreenedIndexMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_SemtechCorpMember" xlink:label="SemtechCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_SemtechCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Semtech Corp [Member]</link:label>
					<link:labelArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/concept-label" xlink:from="SemtechCorpMember" xlink:to="label_SemtechCorpMember"/>
					<link:loc xlink:type="locator" xlink:href="#ist_ArmstrongWorldIndustriesIncMember" xlink:label="ArmstrongWorldIndustriesIncMember"/>
					<link:label xlink:type="resource" xlink:label="label_ArmstrongWorldIndustriesIncMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Armstrong World Industries Inc [Member]</link:label>
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					<link:loc xlink:type="locator" xlink:href="#ist_SanminaCorpMember" xlink:label="SanminaCorpMember"/>
					<link:label xlink:type="resource" xlink:label="label_SanminaCorpMember" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Sanmina Corp [Member]</link:label>
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					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentTypeAxis" xlink:label="InvestmentTypeAxis"/>
					<link:label xlink:type="resource" xlink:label="label_InvestmentTypeAxis" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Investment Type [Axis]</link:label>
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					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_AssetsNet" xlink:label="AssetsNet"/>
					<link:label xlink:type="resource" xlink:label="label_AssetsNet" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Net Assets</link:label>
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					<link:loc xlink:type="locator" xlink:href="https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd#us-gaap_InvestmentCompanyPortfolioTurnover" xlink:label="InvestmentCompanyPortfolioTurnover"/>
					<link:label xlink:type="resource" xlink:label="label_InvestmentCompanyPortfolioTurnover" xlink:role="http://www.xbrl.org/2003/role/label" xml:lang="en-US">Investment Company Portfolio Turnover</link:label>
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					<link:loc xlink:type="locator" xlink:href="https://xbrl.sec.gov/dei/2025/dei-2025.xsd#dei_NoTradingSymbolFlag" xlink:label="dei_NoTradingSymbolFlag"/>
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	<element name="SAndP100Member" id="ist_SAndP100Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
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	<element name="CaseySGeneralStoresIncMember" id="ist_CaseySGeneralStoresIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="UnitedTherapeuticsCorpMember" id="ist_UnitedTherapeuticsCorpMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
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	<element name="ViaviSolutionsIncMember" id="ist_ViaviSolutionsIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
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	<element name="EastmanChemicalCoMember" id="ist_EastmanChemicalCoMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
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	<element name="C000012046Member" id="ist_C000012046Member" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="SAndPSmallCap600ValueIndexTMMember" id="ist_SAndPSmallCap600ValueIndexTMMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="SMEnergyCoMember" id="ist_SMEnergyCoMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="MolinaHealthcareIncMember" id="ist_MolinaHealthcareIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
	<element name="PaycomSoftwareIncMember" id="ist_PaycomSoftwareIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
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	<element name="NextEraEnergyIncMember" id="ist_NextEraEnergyIncMember" type="dtr-types:domainItemType" substitutionGroup="xbrli:item" abstract="true" nillable="true" xbrli:periodType="duration"/>
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</schema>
