Form D Raw Data - Electronic Filing Depository

EFDID: 587237EFD: Raw Data

Issuer: Sensei Biotherapeutics, Inc. (0001829802) - D

Accession: 0001829802-26-000001 () (EDGAR Files) (Form D)

Edgar Posted: Mar. 4, 2026
EFD Posted: Mar. 4, 2026

- < edgarSubmission >

< schemaVersion > X0708 </ schemaVersion >

< submissionType > D </ submissionType >

< testOrLive > LIVE </ testOrLive >

- < primaryIssuer >

< cik > 0001829802 </ cik >

< entityName > Sensei Biotherapeutics, Inc. </ entityName >

- < issuerAddress >

< street1 > 1405 RESEARCH BLVD, SUITE 125 </ street1 >

< city > ROCKVILLE </ city >

< stateOrCountry > MD </ stateOrCountry >

< stateOrCountryDescription > MARYLAND </ stateOrCountryDescription >

< zipCode > 20850 </ zipCode >

</ issuerAddress >

< issuerPhoneNumber > (240) 243-8000 </ issuerPhoneNumber >

< jurisdictionOfInc > DELAWARE </ jurisdictionOfInc >

- < issuerPreviousNameList >

< value > None </ value >

</ issuerPreviousNameList >

- < edgarPreviousNameList >

< value > None </ value >

</ edgarPreviousNameList >

< entityType > Corporation </ entityType >

- < yearOfInc >

< overFiveYears > true </ overFiveYears >

</ yearOfInc >

</ primaryIssuer >

- < relatedPersonsList >

- < relatedPersonInfo >

- < relatedPersonName >

< firstName > Christopher </ firstName >

< lastName > Gerry </ lastName >

</ relatedPersonName >

- < relatedPersonAddress >

< street1 > c/o Sensei Biotherapeutics, Inc. </ street1 >

< street2 > 1405 RESEARCH BLVD, SUITE 125 </ street2 >

< city > ROCKVILLE </ city >

< stateOrCountry > MD </ stateOrCountry >

< stateOrCountryDescription > MARYLAND </ stateOrCountryDescription >

< zipCode > 20850 </ zipCode >

</ relatedPersonAddress >

- < relatedPersonRelationshipList >

< relationship > Executive Officer </ relationship >

< relationship > Director </ relationship >

</ relatedPersonRelationshipList >

< relationshipClarification />

</ relatedPersonInfo >

- < relatedPersonInfo >

- < relatedPersonName >

< firstName > Josiah </ firstName >

< lastName > Craver </ lastName >

</ relatedPersonName >

- < relatedPersonAddress >

< street1 > c/o Sensei Biotherapeutics, Inc. </ street1 >

< street2 > 1405 RESEARCH BLVD, SUITE 125 </ street2 >

< city > ROCKVILLE </ city >

< stateOrCountry > MD </ stateOrCountry >

< stateOrCountryDescription > MARYLAND </ stateOrCountryDescription >

< zipCode > 20850 </ zipCode >

</ relatedPersonAddress >

- < relatedPersonRelationshipList >

< relationship > Executive Officer </ relationship >

</ relatedPersonRelationshipList >

< relationshipClarification />

</ relatedPersonInfo >

- < relatedPersonInfo >

- < relatedPersonName >

< firstName > Tom </ firstName >

< lastName > Ricks </ lastName >

</ relatedPersonName >

- < relatedPersonAddress >

< street1 > c/o Sensei Biotherapeutics, Inc. </ street1 >

< street2 > 1405 RESEARCH BLVD, SUITE 125 </ street2 >

< city > ROCKVILLE </ city >

< stateOrCountry > MD </ stateOrCountry >

< stateOrCountryDescription > MARYLAND </ stateOrCountryDescription >

< zipCode > 20850 </ zipCode >

</ relatedPersonAddress >

- < relatedPersonRelationshipList >

< relationship > Director </ relationship >

</ relatedPersonRelationshipList >

< relationshipClarification />

</ relatedPersonInfo >

- < relatedPersonInfo >

- < relatedPersonName >

< firstName > Anand </ firstName >

< middleName > Kiran </ middleName >

< lastName > Parikh </ lastName >

</ relatedPersonName >

- < relatedPersonAddress >

< street1 > c/o Sensei Biotherapeutics, Inc. </ street1 >

< street2 > 1405 RESEARCH BLVD, SUITE 125 </ street2 >

< city > ROCKVILLE </ city >

< stateOrCountry > MD </ stateOrCountry >

< stateOrCountryDescription > MARYLAND </ stateOrCountryDescription >

< zipCode > 20850 </ zipCode >

</ relatedPersonAddress >

- < relatedPersonRelationshipList >

< relationship > Executive Officer </ relationship >

< relationship > Director </ relationship >

</ relatedPersonRelationshipList >

< relationshipClarification />

</ relatedPersonInfo >

- < relatedPersonInfo >

- < relatedPersonName >

< firstName > Phillip </ firstName >

< middleName > B. </ middleName >

< lastName > Donenberg </ lastName >

</ relatedPersonName >

- < relatedPersonAddress >

< street1 > c/o Sensei Biotherapeutics, Inc. </ street1 >

< street2 > 1405 RESEARCH BLVD, SUITE 125 </ street2 >

< city > ROCKVILLE </ city >

< stateOrCountry > MD </ stateOrCountry >

< stateOrCountryDescription > MARYLAND </ stateOrCountryDescription >

< zipCode > 20850 </ zipCode >

</ relatedPersonAddress >

- < relatedPersonRelationshipList >

< relationship > Director </ relationship >

</ relatedPersonRelationshipList >

< relationshipClarification />

</ relatedPersonInfo >

- < relatedPersonInfo >

- < relatedPersonName >

< firstName > Bob </ firstName >

< lastName > Holmen </ lastName >

</ relatedPersonName >

- < relatedPersonAddress >

< street1 > c/o Sensei Biotherapeutics, Inc. </ street1 >

< street2 > 1405 RESEARCH BLVD, SUITE 125 </ street2 >

< city > ROCKVILLE </ city >

< stateOrCountry > MD </ stateOrCountry >

< stateOrCountryDescription > MARYLAND </ stateOrCountryDescription >

< zipCode > 20850 </ zipCode >

</ relatedPersonAddress >

- < relatedPersonRelationshipList >

< relationship > Director </ relationship >

</ relatedPersonRelationshipList >

< relationshipClarification />

</ relatedPersonInfo >

- < relatedPersonInfo >

- < relatedPersonName >

< firstName > Kristian </ firstName >

< lastName > Humer </ lastName >

</ relatedPersonName >

- < relatedPersonAddress >

< street1 > c/o Sensei Biotherapeutics, Inc. </ street1 >

< street2 > 1405 RESEARCH BLVD, SUITE 125 </ street2 >

< city > ROCKVILLE </ city >

< stateOrCountry > MD </ stateOrCountry >

< stateOrCountryDescription > MARYLAND </ stateOrCountryDescription >

< zipCode > 20850 </ zipCode >

</ relatedPersonAddress >

- < relatedPersonRelationshipList >

< relationship > Director </ relationship >

</ relatedPersonRelationshipList >

< relationshipClarification />

</ relatedPersonInfo >

</ relatedPersonsList >

- < offeringData >

- < industryGroup >

< industryGroupType > Biotechnology </ industryGroupType >

</ industryGroup >

- < issuerSize >

< revenueRange > Decline to Disclose </ revenueRange >

</ issuerSize >

- < federalExemptionsExclusions >

< item > 06b </ item >

</ federalExemptionsExclusions >

- < typeOfFiling >

- < newOrAmendment >

< isAmendment > false </ isAmendment >

</ newOrAmendment >

- < dateOfFirstSale >

< value > 2026-02-17 </ value >

</ dateOfFirstSale >

</ typeOfFiling >

- < durationOfOffering >

< moreThanOneYear > false </ moreThanOneYear >

</ durationOfOffering >

- < typesOfSecuritiesOffered >

< isEquityType > true </ isEquityType >

< isSecurityToBeAcquiredType > true </ isSecurityToBeAcquiredType >

</ typesOfSecuritiesOffered >

- < businessCombinationTransaction >

< isBusinessCombinationTransaction > true </ isBusinessCombinationTransaction >

< clarificationOfResponse />

</ businessCombinationTransaction >

< minimumInvestmentAccepted > 0 </ minimumInvestmentAccepted >

- < salesCompensationList >

- < recipient >

< recipientName > Leerink Partners </ recipientName >

< recipientCRDNumber > 39011 </ recipientCRDNumber >

< associatedBDName > None </ associatedBDName >

< associatedBDCRDNumber > None </ associatedBDCRDNumber >

- < recipientAddress >

< street1 > 53 State Street, 40th Floor </ street1 >

< city > Boston </ city >

< stateOrCountry > MA </ stateOrCountry >

< stateOrCountryDescription > MASSACHUSETTS </ stateOrCountryDescription >

< zipCode > 02109 </ zipCode >

</ recipientAddress >

- < statesOfSolicitationList >

< value > All States </ value >

</ statesOfSolicitationList >

< foreignSolicitation > false </ foreignSolicitation >

</ recipient >

</ salesCompensationList >

- < offeringSalesAmounts >

< totalOfferingAmount > 348906500 </ totalOfferingAmount >

< totalAmountSold > 348906500 </ totalAmountSold >

< totalRemaining > 0 </ totalRemaining >

< clarificationOfResponse />

</ offeringSalesAmounts >

- < investors >

< hasNonAccreditedInvestors > false </ hasNonAccreditedInvestors >

< totalNumberAlreadyInvested > 104 </ totalNumberAlreadyInvested >

</ investors >

- < salesCommissionsFindersFees >

- < salesCommissions >

< dollarAmount > 11700003 </ dollarAmount >

</ salesCommissions >

- < findersFees >

< dollarAmount > 100000 </ dollarAmount >

</ findersFees >

< clarificationOfResponse />

</ salesCommissionsFindersFees >

- < useOfProceeds >

- < grossProceedsUsed >

< dollarAmount > 0 </ dollarAmount >

</ grossProceedsUsed >

< clarificationOfResponse />

</ useOfProceeds >

- < signatureBlock >

< authorizedRepresentative > false </ authorizedRepresentative >

- < signature >

< issuerName > Sensei Biotherapeutics, Inc. </ issuerName >

< signatureName > /s/ Christopher Gerry </ signatureName >

< nameOfSigner > Christopher Gerry </ nameOfSigner >

< signatureTitle > President and Principal Executive Officer </ signatureTitle >

< signatureDate > 2026-03-04 </ signatureDate >

</ signature >

</ signatureBlock >

</ offeringData >

</ edgarSubmission >