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			<securitiesClassTitle>Common Stock, par value $.01 per share</securitiesClassTitle>
			<eventDateRequiresFilingThisStatement>03/31/2026</eventDateRequiresFilingThisStatement>
			<issuerInfo>
				<issuerCik>0001690334</issuerCik>
				<issuerName>SEACOR Marine Holdings Inc.</issuerName>
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						<issuerCusipNumber>78413P101</issuerCusipNumber>
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				<issuerPrincipalExecutiveOfficeAddress>
					<com:street1>12121 Wickchester Lane</com:street1>
					<com:street2>Suite 500</com:street2>
					<com:city>Houston</com:city>
					<com:stateOrCountry>TX</com:stateOrCountry>
					<com:zipCode>77079</com:zipCode>
				</issuerPrincipalExecutiveOfficeAddress>
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			<designateRulesPursuantThisScheduleFiled>
				<designateRulePursuantThisScheduleFiled>Rule 13d-1(d)</designateRulePursuantThisScheduleFiled>
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			<reportingPersonName>P. Oppenheimer Investment Parternship, LP</reportingPersonName>
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			<reportingPersonName>Oppenheimer-Close Investment Partnership, LP</reportingPersonName>
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			<reportingPersonName>Oppvest, LLC</reportingPersonName>
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			<typeOfReportingPerson>OO</typeOfReportingPerson>
			<typeOfReportingPerson>IA</typeOfReportingPerson>
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			<reportingPersonName>Carl K. Oppenheimer</reportingPersonName>
			<citizenshipOrOrganization>X1</citizenshipOrOrganization>
			<reportingPersonBeneficiallyOwnedNumberOfShares>
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			<classPercent>5.24</classPercent>
			<typeOfReportingPerson>IN</typeOfReportingPerson>
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			<item1>
				<issuerName>SEACOR Marine Holdings Inc.</issuerName>
				<issuerPrincipalExecutiveOfficeAddress>12121 Wickchester Lane, Suite 500, Houston, TEXAS 77079</issuerPrincipalExecutiveOfficeAddress>
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				<filingPersonName>P. Oppenheimer Investment Partnership, LP
Oppenheimer-Close Investment Partnership, LP
Oppenheimer + Close, LLC
Oppvest, LLC
Carl K. Oppenheimer</filingPersonName>
				<principalBusinessOfficeOrResidenceAddress>119 West 57th Street
Suite 1515
New York, NY 10019</principalBusinessOfficeOrResidenceAddress>
				<citizenship>Delaware
Delaware
Delaware
Delaware
USA</citizenship>
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				<notApplicableFlag>Y</notApplicableFlag>
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677,971
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0.6%
2.7%
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					<solePowerOrDirectToDispose>530,010
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		<signatureInformation>
			<reportingPersonName>P. Oppenheimer Investment Parternship, LP</reportingPersonName>
			<signatureDetails>
				<signature>Carl K. Oppenheimer</signature>
				<title>Managing Member</title>
				<date>04/21/2026</date>
			</signatureDetails>
		</signatureInformation>
		<signatureInformation>
			<reportingPersonName>Oppenheimer-Close Investment Partnership, LP</reportingPersonName>
			<signatureDetails>
				<signature>Carl K. Oppenheimer</signature>
				<title>Managing Member</title>
				<date>04/21/2026</date>
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		<signatureInformation>
			<reportingPersonName>Oppenheimer + Close, LLC</reportingPersonName>
			<signatureDetails>
				<signature>Carl K. Oppenheimer</signature>
				<title>Managing Member</title>
				<date>04/21/2026</date>
			</signatureDetails>
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		<signatureInformation>
			<reportingPersonName>Oppvest, LLC</reportingPersonName>
			<signatureDetails>
				<signature>Carl K. Oppenheimer</signature>
				<title>Managing Member</title>
				<date>04/21/2026</date>
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		<signatureInformation>
			<reportingPersonName>Carl K. Oppenheimer</reportingPersonName>
			<signatureDetails>
				<signature>Carl K. Oppenheimer</signature>
				<title>Managing Member</title>
				<date>04/21/2026</date>
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