Form D Raw Data - Electronic Filing Depository

EFDID: 4744EFD: Raw Data

Issuer: MACKAY MUNICIPAL OPPORTUNITIES FUND LP (0001432468) - D/A

Accession: 0001432468-26-000001 () (EDGAR Files) (Form D)

Edgar Posted: Jan. 5, 2026
EFD Posted: Jan. 5, 2026

- < edgarSubmission >

< schemaVersion > X0708 </ schemaVersion >

< submissionType > D/A </ submissionType >

< testOrLive > LIVE </ testOrLive >

- < primaryIssuer >

< cik > 0001432468 </ cik >

< entityName > MACKAY MUNICIPAL OPPORTUNITIES FUND LP </ entityName >

- < issuerAddress >

< street1 > 299 Park Avenue </ street1 >

< street2 > 32nd Floor </ street2 >

< city > New York </ city >

< stateOrCountry > NY </ stateOrCountry >

< stateOrCountryDescription > NEW YORK </ stateOrCountryDescription >

< zipCode > 10171 </ zipCode >

</ issuerAddress >

< issuerPhoneNumber > (212) 758-5400 </ issuerPhoneNumber >

< jurisdictionOfInc > DELAWARE </ jurisdictionOfInc >

- < edgarPreviousNameList >

< previousName > MARINER MUNICIPAL OPPORTUNITIES FUND LP </ previousName >

< previousName > MACKAY MUNICIPAL OPPORTUNITIES FUND LP </ previousName >

</ edgarPreviousNameList >

< entityType > Limited Partnership </ entityType >

- < yearOfInc >

< overFiveYears > true </ overFiveYears >

</ yearOfInc >

</ primaryIssuer >

- < relatedPersonsList >

- < relatedPersonInfo >

- < relatedPersonName >

< firstName > N/A </ firstName >

< lastName > MacKay Municipal Managers Opportunities GP LLC </ lastName >

</ relatedPersonName >

- < relatedPersonAddress >

< street1 > 299 Park Avenue </ street1 >

< street2 > 32nd Floor </ street2 >

< city > New York </ city >

< stateOrCountry > NY </ stateOrCountry >

< stateOrCountryDescription > NEW YORK </ stateOrCountryDescription >

< zipCode > 10171 </ zipCode >

</ relatedPersonAddress >

- < relatedPersonRelationshipList >

< relationship > Promoter </ relationship >

</ relatedPersonRelationshipList >

< relationshipClarification > General Partner of the Issuer </ relationshipClarification >

</ relatedPersonInfo >

- < relatedPersonInfo >

- < relatedPersonName >

< firstName > N/A </ firstName >

< lastName > MacKay Shields LLC </ lastName >

</ relatedPersonName >

- < relatedPersonAddress >

< street1 > 299 Park Avenue </ street1 >

< street2 > 32nd Floor </ street2 >

< city > New York </ city >

< stateOrCountry > NY </ stateOrCountry >

< stateOrCountryDescription > NEW YORK </ stateOrCountryDescription >

< zipCode > 10171 </ zipCode >

</ relatedPersonAddress >

- < relatedPersonRelationshipList >

< relationship > Promoter </ relationship >

</ relatedPersonRelationshipList >

< relationshipClarification > Investment Manager of the Issuer </ relationshipClarification >

</ relatedPersonInfo >

- < relatedPersonInfo >

- < relatedPersonName >

< firstName > John </ firstName >

< middleName > M. </ middleName >

< lastName > Loffredo </ lastName >

</ relatedPersonName >

- < relatedPersonAddress >

< street1 > 506 Carnegie Center Drive </ street1 >

< street2 > Suite 200 </ street2 >

< city > Princeton </ city >

< stateOrCountry > NJ </ stateOrCountry >

< stateOrCountryDescription > NEW JERSEY </ stateOrCountryDescription >

< zipCode > 08540 </ zipCode >

</ relatedPersonAddress >

- < relatedPersonRelationshipList >

< relationship > Executive Officer </ relationship >

</ relatedPersonRelationshipList >

< relationshipClarification > Executive Managing Director of MacKay Shields LLC </ relationshipClarification >

</ relatedPersonInfo >

- < relatedPersonInfo >

- < relatedPersonName >

< firstName > Robert </ firstName >

< middleName > A. </ middleName >

< lastName > DiMella </ lastName >

</ relatedPersonName >

- < relatedPersonAddress >

< street1 > 1960 E. Grand Avenue </ street1 >

< street2 > Suite 370 </ street2 >

< city > El Segundo </ city >

< stateOrCountry > CA </ stateOrCountry >

< stateOrCountryDescription > CALIFORNIA </ stateOrCountryDescription >

< zipCode > 90245 </ zipCode >

</ relatedPersonAddress >

- < relatedPersonRelationshipList >

< relationship > Executive Officer </ relationship >

</ relatedPersonRelationshipList >

< relationshipClarification > Executive Managing Director of MacKay Shields LLC </ relationshipClarification >

</ relatedPersonInfo >

</ relatedPersonsList >

- < offeringData >

- < industryGroup >

< industryGroupType > Pooled Investment Fund </ industryGroupType >

- < investmentFundInfo >

< investmentFundType > Other Investment Fund </ investmentFundType >

< is40Act > false </ is40Act >

</ investmentFundInfo >

</ industryGroup >

- < issuerSize >

< aggregateNetAssetValueRange > Decline to Disclose </ aggregateNetAssetValueRange >

</ issuerSize >

- < federalExemptionsExclusions >

< item > 06b </ item >

< item > 3C </ item >

< item > 3C.7 </ item >

</ federalExemptionsExclusions >

- < typeOfFiling >

- < newOrAmendment >

< isAmendment > true </ isAmendment >

< previousAccessionNumber > 0001137439-25-000001 </ previousAccessionNumber >

</ newOrAmendment >

- < dateOfFirstSale >

< value > 2008-04-01 </ value >

</ dateOfFirstSale >

</ typeOfFiling >

- < durationOfOffering >

< moreThanOneYear > true </ moreThanOneYear >

</ durationOfOffering >

- < typesOfSecuritiesOffered >

< isPooledInvestmentFundType > true </ isPooledInvestmentFundType >

< isOtherType > true </ isOtherType >

< descriptionOfOtherType > Limited Partnership Interests </ descriptionOfOtherType >

</ typesOfSecuritiesOffered >

- < businessCombinationTransaction >

< isBusinessCombinationTransaction > false </ isBusinessCombinationTransaction >

< clarificationOfResponse />

</ businessCombinationTransaction >

< minimumInvestmentAccepted > 1000000 </ minimumInvestmentAccepted >

- < salesCompensationList >

- < recipient >

< recipientName > NYLIFE Distributors LLC </ recipientName >

< recipientCRDNumber > 35350 </ recipientCRDNumber >

< associatedBDName > None </ associatedBDName >

< associatedBDCRDNumber > None </ associatedBDCRDNumber >

- < recipientAddress >

< street1 > 30 Hudson Street </ street1 >

< city > Jersey City </ city >

< stateOrCountry > NJ </ stateOrCountry >

< stateOrCountryDescription > NEW JERSEY </ stateOrCountryDescription >

< zipCode > 07302 </ zipCode >

</ recipientAddress >

- < statesOfSolicitationList >

< value > All States </ value >

</ statesOfSolicitationList >

< foreignSolicitation > false </ foreignSolicitation >

</ recipient >

- < recipient >

< recipientName > Mariner Group Capital Markets, Inc. </ recipientName >

< recipientCRDNumber > 25878 </ recipientCRDNumber >

< associatedBDName > None </ associatedBDName >

< associatedBDCRDNumber > None </ associatedBDCRDNumber >

- < recipientAddress >

< street1 > 500 Mamaroneck Avenue </ street1 >

< street2 > 4th Floor </ street2 >

< city > Harrison </ city >

< stateOrCountry > NY </ stateOrCountry >

< stateOrCountryDescription > NEW YORK </ stateOrCountryDescription >

< zipCode > 10528 </ zipCode >

</ recipientAddress >

- < statesOfSolicitationList >

< value > All States </ value >

</ statesOfSolicitationList >

< foreignSolicitation > false </ foreignSolicitation >

</ recipient >

- < recipient >

< recipientName > Merrill Lynch, Pierce, Fenner & Smith Incorporated </ recipientName >

< recipientCRDNumber > 7691 </ recipientCRDNumber >

< associatedBDName > None </ associatedBDName >

< associatedBDCRDNumber > None </ associatedBDCRDNumber >

- < recipientAddress >

< street1 > One Bryant Park </ street1 >

< city > New York </ city >

< stateOrCountry > NY </ stateOrCountry >

< stateOrCountryDescription > NEW YORK </ stateOrCountryDescription >

< zipCode > 10036 </ zipCode >

</ recipientAddress >

- < statesOfSolicitationList >

< value > All States </ value >

</ statesOfSolicitationList >

< foreignSolicitation > false </ foreignSolicitation >

</ recipient >

- < recipient >

< recipientName > Morgan Stanley Smith Barney LLC </ recipientName >

< recipientCRDNumber > 149777 </ recipientCRDNumber >

< associatedBDName > None </ associatedBDName >

< associatedBDCRDNumber > None </ associatedBDCRDNumber >

- < recipientAddress >

< street1 > 2000 Westchester Avenue </ street1 >

< city > Purchase </ city >

< stateOrCountry > NY </ stateOrCountry >

< stateOrCountryDescription > NEW YORK </ stateOrCountryDescription >

< zipCode > 10577-2530 </ zipCode >

</ recipientAddress >

- < statesOfSolicitationList >

< value > All States </ value >

</ statesOfSolicitationList >

< foreignSolicitation > false </ foreignSolicitation >

</ recipient >

- < recipient >

< recipientName > UBS Financial Services Inc. </ recipientName >

< recipientCRDNumber > 8174 </ recipientCRDNumber >

< associatedBDName > None </ associatedBDName >

< associatedBDCRDNumber > None </ associatedBDCRDNumber >

- < recipientAddress >

< street1 > 1200 Harbor Boulevard </ street1 >

< city > Weehawken </ city >

< stateOrCountry > NJ </ stateOrCountry >

< stateOrCountryDescription > NEW JERSEY </ stateOrCountryDescription >

< zipCode > 07086 </ zipCode >

</ recipientAddress >

- < statesOfSolicitationList >

< value > All States </ value >

</ statesOfSolicitationList >

< foreignSolicitation > false </ foreignSolicitation >

</ recipient >

- < recipient >

< recipientName > Wells Fargo Advisors Financial Network, LLC </ recipientName >

< recipientCRDNumber > 11025 </ recipientCRDNumber >

< associatedBDName > None </ associatedBDName >

< associatedBDCRDNumber > None </ associatedBDCRDNumber >

- < recipientAddress >

< street1 > One North Jefferson Avenue </ street1 >

< street2 > H0004-05C </ street2 >

< city > St. Louis </ city >

< stateOrCountry > MO </ stateOrCountry >

< stateOrCountryDescription > MISSOURI </ stateOrCountryDescription >

< zipCode > 63103 </ zipCode >

</ recipientAddress >

- < statesOfSolicitationList >

< value > All States </ value >

</ statesOfSolicitationList >

< foreignSolicitation > false </ foreignSolicitation >

</ recipient >

- < recipient >

< recipientName > Wells Fargo Clearing Services, LLC </ recipientName >

< recipientCRDNumber > 19616 </ recipientCRDNumber >

< associatedBDName > None </ associatedBDName >

< associatedBDCRDNumber > None </ associatedBDCRDNumber >

- < recipientAddress >

< street1 > One North Jefferson Avenue </ street1 >

< street2 > H0004-05E </ street2 >

< city > St. Louis </ city >

< stateOrCountry > MO </ stateOrCountry >

< stateOrCountryDescription > MISSOURI </ stateOrCountryDescription >

< zipCode > 63103 </ zipCode >

</ recipientAddress >

- < statesOfSolicitationList >

< value > All States </ value >

</ statesOfSolicitationList >

< foreignSolicitation > false </ foreignSolicitation >

</ recipient >

</ salesCompensationList >

- < offeringSalesAmounts >

< totalOfferingAmount > Indefinite </ totalOfferingAmount >

< totalAmountSold > 3535898154 </ totalAmountSold >

< totalRemaining > Indefinite </ totalRemaining >

< clarificationOfResponse > Certain entities listed in Item 12 are no longer registered broker-dealers & therefore receive no commissions. </ clarificationOfResponse >

</ offeringSalesAmounts >

- < investors >

< hasNonAccreditedInvestors > false </ hasNonAccreditedInvestors >

< totalNumberAlreadyInvested > 2180 </ totalNumberAlreadyInvested >

</ investors >

- < salesCommissionsFindersFees >

- < salesCommissions >

< dollarAmount > 36800000 </ dollarAmount >

< isEstimate > true </ isEstimate >

</ salesCommissions >

- < findersFees >

< dollarAmount > 0 </ dollarAmount >

</ findersFees >

< clarificationOfResponse > The Investment Manager of the Issuer shares a portion of its management fee received from the Issuer with one or more of the Issuer's placement agents. Such placement agents may receive other fees (e.g., sales loads) payable directly to the placement </ clarificationOfResponse >

</ salesCommissionsFindersFees >

- < useOfProceeds >

- < grossProceedsUsed >

< dollarAmount > 0 </ dollarAmount >

</ grossProceedsUsed >

< clarificationOfResponse > (Continued from Item 15) agent (outside the Issuer) in addition to (and not deducted from) investment amounts; the amount of such fees are unknown to the Issuer and the Investment Manager. </ clarificationOfResponse >

</ useOfProceeds >

- < signatureBlock >

< authorizedRepresentative > false </ authorizedRepresentative >

- < signature >

< issuerName > MACKAY MUNICIPAL OPPORTUNITIES FUND LP </ issuerName >

< signatureName > /s/Rene A. Bustamante </ signatureName >

< nameOfSigner > Rene A. Bustamante </ nameOfSigner >

< signatureTitle > Executive Managing Director of the Investment Manager </ signatureTitle >

< signatureDate > 2025-12-29 </ signatureDate >

</ signature >

</ signatureBlock >

</ offeringData >

</ edgarSubmission >