{"data":[{"accessionNo":"0001732748-26-000003","formType":"SCHEDULE 13G","amendmentNo":null,"issuerCik":"0001785530","issuerName":"Werewolf Therapeutics, Inc.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common stock 0,0001$ per share","eventDate":"2026-09-18","reportingPerson":"MOLL PETER","reportingCik":null,"personType":"OO","sharesOwned":2537138,"percentOfClass":5.2,"filedAt":"2026-09-21","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-26-000187","formType":"SCHEDULE 13D/A","amendmentNo":12,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2026-06-30","reportingPerson":"RA Capital Management, L.P.","reportingCik":"0001346824","personType":"IA,PN","sharesOwned":1985541,"percentOfClass":4.1,"filedAt":"2026-07-02","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-26-000187","formType":"SCHEDULE 13D/A","amendmentNo":12,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2026-06-30","reportingPerson":"Rajeev Shah","reportingCik":"0001619841","personType":"HC,IN","sharesOwned":1985541,"percentOfClass":4.1,"filedAt":"2026-07-02","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-26-000187","formType":"SCHEDULE 13D/A","amendmentNo":12,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2026-06-30","reportingPerson":"Peter Kolchinsky","reportingCik":"0001384859","personType":"HC,IN","sharesOwned":1985541,"percentOfClass":4.1,"filedAt":"2026-07-02","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-26-000187","formType":"SCHEDULE 13D/A","amendmentNo":12,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2026-06-30","reportingPerson":"RA Capital Healthcare Fund, L.P.","reportingCik":"0001315082","personType":"PN","sharesOwned":1853646,"percentOfClass":3.8,"filedAt":"2026-07-02","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-26-000185","formType":"SCHEDULE 13D/A","amendmentNo":11,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2026-06-24","reportingPerson":"Peter Kolchinsky","reportingCik":"0001384859","personType":"HC,IN","sharesOwned":2915742,"percentOfClass":6,"filedAt":"2026-06-26","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-26-000185","formType":"SCHEDULE 13D/A","amendmentNo":11,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2026-06-24","reportingPerson":"RA Capital Management, L.P.","reportingCik":"0001346824","personType":"IA,PN","sharesOwned":2915742,"percentOfClass":6,"filedAt":"2026-06-26","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-26-000185","formType":"SCHEDULE 13D/A","amendmentNo":11,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2026-06-24","reportingPerson":"Rajeev Shah","reportingCik":"0001619841","personType":"HC,IN","sharesOwned":2915742,"percentOfClass":6,"filedAt":"2026-06-26","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-26-000185","formType":"SCHEDULE 13D/A","amendmentNo":11,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2026-06-24","reportingPerson":"RA Capital Healthcare Fund, L.P.","reportingCik":"0001315082","personType":"PN","sharesOwned":2721635,"percentOfClass":5.6,"filedAt":"2026-06-26","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-26-000180","formType":"SCHEDULE 13D/A","amendmentNo":10,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2026-06-17","reportingPerson":"Peter Kolchinsky","reportingCik":"0001384859","personType":"HC,IN","sharesOwned":3654307,"percentOfClass":7.5,"filedAt":"2026-06-22","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-26-000180","formType":"SCHEDULE 13D/A","amendmentNo":10,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2026-06-17","reportingPerson":"RA Capital Management, L.P.","reportingCik":"0001346824","personType":"IA,PN","sharesOwned":3654307,"percentOfClass":7.5,"filedAt":"2026-06-22","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-26-000180","formType":"SCHEDULE 13D/A","amendmentNo":10,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2026-06-17","reportingPerson":"Rajeev Shah","reportingCik":"0001619841","personType":"HC,IN","sharesOwned":3654307,"percentOfClass":7.5,"filedAt":"2026-06-22","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-26-000180","formType":"SCHEDULE 13D/A","amendmentNo":10,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2026-06-17","reportingPerson":"RA Capital Healthcare Fund, L.P.","reportingCik":"0001315082","personType":"PN","sharesOwned":3411559,"percentOfClass":7,"filedAt":"2026-06-22","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-26-000175","formType":"SCHEDULE 13D/A","amendmentNo":9,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2026-06-11","reportingPerson":"Peter Kolchinsky","reportingCik":"0001384859","personType":"HC,IN","sharesOwned":5138703,"percentOfClass":10.6,"filedAt":"2026-06-15","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-26-000175","formType":"SCHEDULE 13D/A","amendmentNo":9,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2026-06-11","reportingPerson":"RA Capital Management, L.P.","reportingCik":"0001346824","personType":"IA,PN","sharesOwned":5138703,"percentOfClass":10.6,"filedAt":"2026-06-15","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-26-000175","formType":"SCHEDULE 13D/A","amendmentNo":9,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2026-06-11","reportingPerson":"Rajeev Shah","reportingCik":"0001619841","personType":"HC,IN","sharesOwned":5138703,"percentOfClass":10.6,"filedAt":"2026-06-15","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-26-000175","formType":"SCHEDULE 13D/A","amendmentNo":9,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2026-06-11","reportingPerson":"RA Capital Healthcare Fund, L.P.","reportingCik":"0001315082","personType":"PN","sharesOwned":4797350,"percentOfClass":9.9,"filedAt":"2026-06-15","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-26-000131","formType":"SCHEDULE 13D/A","amendmentNo":8,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2026-05-12","reportingPerson":"RA Capital Management, L.P.","reportingCik":"0001346824","personType":"IA,PN","sharesOwned":6116140,"percentOfClass":12.6,"filedAt":"2026-05-14","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-26-000131","formType":"SCHEDULE 13D/A","amendmentNo":8,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2026-05-12","reportingPerson":"Rajeev Shah","reportingCik":"0001619841","personType":"HC,IN","sharesOwned":6116140,"percentOfClass":12.6,"filedAt":"2026-05-14","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-26-000131","formType":"SCHEDULE 13D/A","amendmentNo":8,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2026-05-12","reportingPerson":"Peter Kolchinsky","reportingCik":"0001384859","personType":"HC,IN","sharesOwned":6116140,"percentOfClass":12.6,"filedAt":"2026-05-14","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-26-000131","formType":"SCHEDULE 13D/A","amendmentNo":8,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2026-05-12","reportingPerson":"RA Capital Healthcare Fund, L.P.","reportingCik":"0001315082","personType":"PN","sharesOwned":5709858,"percentOfClass":11.7,"filedAt":"2026-05-14","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000006","formType":"SCHEDULE 13D/A","amendmentNo":7,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-08","reportingPerson":"ANSBERT GADICKE","reportingCik":"0001134655","personType":"IN","sharesOwned":1826646,"percentOfClass":3.8,"filedAt":"2026-05-12","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000006","formType":"SCHEDULE 13D/A","amendmentNo":7,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-08","reportingPerson":"LUKE EVNIN","reportingCik":"0001134657","personType":"IN","sharesOwned":1171175,"percentOfClass":2.4,"filedAt":"2026-05-12","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000006","formType":"SCHEDULE 13D/A","amendmentNo":7,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-08","reportingPerson":"MPM BioVentures 2014 LLC","reportingCik":"0001765021","personType":"OO","sharesOwned":872361,"percentOfClass":1.8,"filedAt":"2026-05-12","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000006","formType":"SCHEDULE 13D/A","amendmentNo":7,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-08","reportingPerson":"Todd Foley","reportingCik":"0001473930","personType":"IN","sharesOwned":872361,"percentOfClass":1.8,"filedAt":"2026-05-12","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000006","formType":"SCHEDULE 13D/A","amendmentNo":7,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-08","reportingPerson":"MPM BioVentures 2014 GP LLC","reportingCik":"0001765091","personType":"OO","sharesOwned":845094,"percentOfClass":1.7,"filedAt":"2026-05-12","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000006","formType":"SCHEDULE 13D/A","amendmentNo":7,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-08","reportingPerson":"MPM BioVentures 2014, L.P.","reportingCik":"0001609492","personType":"PN","sharesOwned":792254,"percentOfClass":1.6,"filedAt":"2026-05-12","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000006","formType":"SCHEDULE 13D/A","amendmentNo":7,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-08","reportingPerson":"MPM BioImpact LLC","reportingCik":"0001687078","personType":"OO","sharesOwned":655471,"percentOfClass":1.3,"filedAt":"2026-05-12","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000006","formType":"SCHEDULE 13D/A","amendmentNo":7,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-08","reportingPerson":"Oncology Impact Fund (Cayman) Management L.P.","reportingCik":"0001721036","personType":"PN","sharesOwned":655471,"percentOfClass":1.3,"filedAt":"2026-05-12","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000006","formType":"SCHEDULE 13D/A","amendmentNo":7,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-08","reportingPerson":"UBS Oncology Impact Fund L.P.","reportingCik":"0001691428","personType":"PN","sharesOwned":655471,"percentOfClass":1.3,"filedAt":"2026-05-12","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000006","formType":"SCHEDULE 13D/A","amendmentNo":7,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-08","reportingPerson":"MPM ONCOLOGY INNOVATIONS FUND LP","reportingCik":"0001719960","personType":"PN","sharesOwned":173334,"percentOfClass":0.4,"filedAt":"2026-05-12","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000006","formType":"SCHEDULE 13D/A","amendmentNo":7,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-08","reportingPerson":"MPM Oncology Innovations Fund GP LLC","reportingCik":"0001857903","personType":"OO","sharesOwned":173334,"percentOfClass":0.4,"filedAt":"2026-05-12","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000006","formType":"SCHEDULE 13D/A","amendmentNo":7,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-08","reportingPerson":"MPM ASSET MANAGEMENT LLC","reportingCik":"0001263048","personType":"OO","sharesOwned":125480,"percentOfClass":0.3,"filedAt":"2026-05-12","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000006","formType":"SCHEDULE 13D/A","amendmentNo":7,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-08","reportingPerson":"MPM Asset Management Investors BV2014 LLC","reportingCik":"0001609495","personType":"OO","sharesOwned":27267,"percentOfClass":0.1,"filedAt":"2026-05-12","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000006","formType":"SCHEDULE 13D/A","amendmentNo":7,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-08","reportingPerson":"MPM BioVentures 2014 (B), L.P.","reportingCik":"0001609493","personType":"PN","sharesOwned":52840,"percentOfClass":0.1,"filedAt":"2026-05-12","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000004","formType":"SCHEDULE 13D/A","amendmentNo":6,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-01","reportingPerson":"ANSBERT GADICKE","reportingCik":"0001134655","personType":"IN","sharesOwned":2608501,"percentOfClass":5.4,"filedAt":"2026-05-05","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000004","formType":"SCHEDULE 13D/A","amendmentNo":6,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-01","reportingPerson":"LUKE EVNIN","reportingCik":"0001134657","personType":"IN","sharesOwned":1672470,"percentOfClass":3.4,"filedAt":"2026-05-05","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000004","formType":"SCHEDULE 13D/A","amendmentNo":6,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-01","reportingPerson":"Todd Foley","reportingCik":"0001473930","personType":"IN","sharesOwned":1245756,"percentOfClass":2.6,"filedAt":"2026-05-05","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000004","formType":"SCHEDULE 13D/A","amendmentNo":6,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-01","reportingPerson":"MPM BioVentures 2014 LLC","reportingCik":"0001765021","personType":"OO","sharesOwned":1245756,"percentOfClass":2.6,"filedAt":"2026-05-05","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000004","formType":"SCHEDULE 13D/A","amendmentNo":6,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-01","reportingPerson":"MPM BioVentures 2014 GP LLC","reportingCik":"0001765091","personType":"OO","sharesOwned":1206817,"percentOfClass":2.5,"filedAt":"2026-05-05","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000004","formType":"SCHEDULE 13D/A","amendmentNo":6,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-01","reportingPerson":"MPM BioVentures 2014, L.P.","reportingCik":"0001609492","personType":"PN","sharesOwned":1131359,"percentOfClass":2.3,"filedAt":"2026-05-05","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000004","formType":"SCHEDULE 13D/A","amendmentNo":6,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-01","reportingPerson":"UBS Oncology Impact Fund L.P.","reportingCik":"0001691428","personType":"PN","sharesOwned":936031,"percentOfClass":1.9,"filedAt":"2026-05-05","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000004","formType":"SCHEDULE 13D/A","amendmentNo":6,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-01","reportingPerson":"MPM BioImpact LLC","reportingCik":"0001687078","personType":"OO","sharesOwned":936031,"percentOfClass":1.9,"filedAt":"2026-05-05","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000004","formType":"SCHEDULE 13D/A","amendmentNo":6,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-01","reportingPerson":"Oncology Impact Fund (Cayman) Management L.P.","reportingCik":"0001721036","personType":"PN","sharesOwned":936031,"percentOfClass":1.9,"filedAt":"2026-05-05","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000004","formType":"SCHEDULE 13D/A","amendmentNo":6,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-01","reportingPerson":"MPM Oncology Innovations Fund GP LLC","reportingCik":"0001857903","personType":"OO","sharesOwned":247526,"percentOfClass":0.5,"filedAt":"2026-05-05","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000004","formType":"SCHEDULE 13D/A","amendmentNo":6,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-01","reportingPerson":"MPM ONCOLOGY INNOVATIONS FUND LP","reportingCik":"0001719960","personType":"PN","sharesOwned":247526,"percentOfClass":0.5,"filedAt":"2026-05-05","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000004","formType":"SCHEDULE 13D/A","amendmentNo":6,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-01","reportingPerson":"MPM ASSET MANAGEMENT LLC","reportingCik":"0001263048","personType":"OO","sharesOwned":179188,"percentOfClass":0.4,"filedAt":"2026-05-05","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000004","formType":"SCHEDULE 13D/A","amendmentNo":6,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-01","reportingPerson":"MPM BioVentures 2014 (B), L.P.","reportingCik":"0001609493","personType":"PN","sharesOwned":75458,"percentOfClass":0.2,"filedAt":"2026-05-05","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000004","formType":"SCHEDULE 13D/A","amendmentNo":6,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":"95075A107","securityClass":"Common Stock","eventDate":"2026-05-01","reportingPerson":"MPM Asset Management Investors BV2014 LLC","reportingCik":"0001609495","personType":"OO","sharesOwned":38939,"percentOfClass":0.1,"filedAt":"2026-05-05","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001193125-26-046463","formType":"SCHEDULE 13G/A","amendmentNo":1,"issuerCik":"0001785530","issuerName":"Werewolf Therapeutics, Inc.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-31","reportingPerson":"Longwood Fund III, L.P.","reportingCik":null,"personType":"PN","sharesOwned":1677082,"percentOfClass":3.5,"filedAt":"2026-02-11","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001193125-26-046463","formType":"SCHEDULE 13G/A","amendmentNo":1,"issuerCik":"0001785530","issuerName":"Werewolf Therapeutics, Inc.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-31","reportingPerson":"Longwood Fund III GP, LLC","reportingCik":null,"personType":"OO","sharesOwned":1677082,"percentOfClass":3.5,"filedAt":"2026-02-11","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000002","formType":"SCHEDULE 13D/A","amendmentNo":5,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2026-01-14","reportingPerson":"ANSBERT GADICKE","reportingCik":"0001134655","personType":"IN","sharesOwned":3368670,"percentOfClass":6.9,"filedAt":"2026-01-16","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000002","formType":"SCHEDULE 13D/A","amendmentNo":5,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2026-01-14","reportingPerson":"LUKE EVNIN","reportingCik":"0001134657","personType":"IN","sharesOwned":2159860,"percentOfClass":4.4,"filedAt":"2026-01-16","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000002","formType":"SCHEDULE 13D/A","amendmentNo":5,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2026-01-14","reportingPerson":"MPM BioVentures 2014 LLC","reportingCik":"0001765021","personType":"OO","sharesOwned":1608793,"percentOfClass":3.3,"filedAt":"2026-01-16","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000002","formType":"SCHEDULE 13D/A","amendmentNo":5,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2026-01-14","reportingPerson":"Todd Foley","reportingCik":"0001473930","personType":"IN","sharesOwned":1608793,"percentOfClass":3.3,"filedAt":"2026-01-16","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000002","formType":"SCHEDULE 13D/A","amendmentNo":5,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2026-01-14","reportingPerson":"MPM BioVentures 2014 GP LLC","reportingCik":"0001765091","personType":"OO","sharesOwned":1558504,"percentOfClass":3.2,"filedAt":"2026-01-16","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000002","formType":"SCHEDULE 13D/A","amendmentNo":5,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2026-01-14","reportingPerson":"MPM BioVentures 2014, L.P.","reportingCik":"0001609492","personType":"PN","sharesOwned":1461054,"percentOfClass":3,"filedAt":"2026-01-16","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000002","formType":"SCHEDULE 13D/A","amendmentNo":5,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2026-01-14","reportingPerson":"UBS Oncology Impact Fund L.P.","reportingCik":"0001691428","personType":"PN","sharesOwned":1208810,"percentOfClass":2.5,"filedAt":"2026-01-16","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000002","formType":"SCHEDULE 13D/A","amendmentNo":5,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2026-01-14","reportingPerson":"MPM BioImpact LLC","reportingCik":"0001687078","personType":"OO","sharesOwned":1208810,"percentOfClass":2.5,"filedAt":"2026-01-16","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000002","formType":"SCHEDULE 13D/A","amendmentNo":5,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2026-01-14","reportingPerson":"Oncology Impact Fund (Cayman) Management L.P.","reportingCik":"0001721036","personType":"PN","sharesOwned":1208810,"percentOfClass":2.5,"filedAt":"2026-01-16","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000002","formType":"SCHEDULE 13D/A","amendmentNo":5,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2026-01-14","reportingPerson":"MPM Oncology Innovations Fund GP LLC","reportingCik":"0001857903","personType":"OO","sharesOwned":319659,"percentOfClass":0.7,"filedAt":"2026-01-16","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000002","formType":"SCHEDULE 13D/A","amendmentNo":5,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2026-01-14","reportingPerson":"MPM ONCOLOGY INNOVATIONS FUND LP","reportingCik":"0001719960","personType":"PN","sharesOwned":319659,"percentOfClass":0.7,"filedAt":"2026-01-16","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000002","formType":"SCHEDULE 13D/A","amendmentNo":5,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2026-01-14","reportingPerson":"MPM ASSET MANAGEMENT LLC","reportingCik":"0001263048","personType":"OO","sharesOwned":231408,"percentOfClass":0.5,"filedAt":"2026-01-16","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000002","formType":"SCHEDULE 13D/A","amendmentNo":5,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2026-01-14","reportingPerson":"MPM BioVentures 2014 (B), L.P.","reportingCik":"0001609493","personType":"PN","sharesOwned":97450,"percentOfClass":0.2,"filedAt":"2026-01-16","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001609492-26-000002","formType":"SCHEDULE 13D/A","amendmentNo":5,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2026-01-14","reportingPerson":"MPM Asset Management Investors BV2014 LLC","reportingCik":"0001609495","personType":"OO","sharesOwned":50289,"percentOfClass":0.1,"filedAt":"2026-01-16","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000666","formType":"SCHEDULE 13D/A","amendmentNo":4,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-22","reportingPerson":"ANSBERT GADICKE","reportingCik":"0001134655","personType":"IN","sharesOwned":3977612,"percentOfClass":8.2,"filedAt":"2025-12-29","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000666","formType":"SCHEDULE 13D/A","amendmentNo":4,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-22","reportingPerson":"LUKE EVNIN","reportingCik":"0001134657","personType":"IN","sharesOwned":2550674,"percentOfClass":5.3,"filedAt":"2025-12-29","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000666","formType":"SCHEDULE 13D/A","amendmentNo":4,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-22","reportingPerson":"MPM BioVentures 2014 LLC","reportingCik":"0001765021","personType":"OO","sharesOwned":1899629,"percentOfClass":3.9,"filedAt":"2025-12-29","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000666","formType":"SCHEDULE 13D/A","amendmentNo":4,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-22","reportingPerson":"Todd Foley","reportingCik":"0001473930","personType":"IN","sharesOwned":1899629,"percentOfClass":3.9,"filedAt":"2025-12-29","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000666","formType":"SCHEDULE 13D/A","amendmentNo":4,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-22","reportingPerson":"MPM BioVentures 2014 GP LLC","reportingCik":"0001765091","personType":"OO","sharesOwned":1840250,"percentOfClass":3.8,"filedAt":"2025-12-29","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000666","formType":"SCHEDULE 13D/A","amendmentNo":4,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-22","reportingPerson":"MPM BioVentures 2014, L.P.","reportingCik":"0001609492","personType":"PN","sharesOwned":1725184,"percentOfClass":3.6,"filedAt":"2025-12-29","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000666","formType":"SCHEDULE 13D/A","amendmentNo":4,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-22","reportingPerson":"MPM BioImpact LLC","reportingCik":"0001687078","personType":"OO","sharesOwned":1426938,"percentOfClass":2.9,"filedAt":"2025-12-29","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000666","formType":"SCHEDULE 13D/A","amendmentNo":4,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-22","reportingPerson":"Oncology Impact Fund (Cayman) Management L.P.","reportingCik":"0001721036","personType":"PN","sharesOwned":1426938,"percentOfClass":2.9,"filedAt":"2025-12-29","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000666","formType":"SCHEDULE 13D/A","amendmentNo":4,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-22","reportingPerson":"UBS Oncology Impact Fund L.P.","reportingCik":"0001691428","personType":"PN","sharesOwned":1426938,"percentOfClass":2.9,"filedAt":"2025-12-29","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000666","formType":"SCHEDULE 13D/A","amendmentNo":4,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-22","reportingPerson":"MPM ONCOLOGY INNOVATIONS FUND LP","reportingCik":"0001719960","personType":"PN","sharesOwned":377827,"percentOfClass":0.8,"filedAt":"2025-12-29","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000666","formType":"SCHEDULE 13D/A","amendmentNo":4,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-22","reportingPerson":"MPM Oncology Innovations Fund GP LLC","reportingCik":"0001857903","personType":"OO","sharesOwned":377827,"percentOfClass":0.8,"filedAt":"2025-12-29","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000666","formType":"SCHEDULE 13D/A","amendmentNo":4,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-22","reportingPerson":"MPM ASSET MANAGEMENT LLC","reportingCik":"0001263048","personType":"OO","sharesOwned":273218,"percentOfClass":0.6,"filedAt":"2025-12-29","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000666","formType":"SCHEDULE 13D/A","amendmentNo":4,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-22","reportingPerson":"MPM BioVentures 2014 (B), L.P.","reportingCik":"0001609493","personType":"PN","sharesOwned":115066,"percentOfClass":0.2,"filedAt":"2025-12-29","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000666","formType":"SCHEDULE 13D/A","amendmentNo":4,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-22","reportingPerson":"MPM Asset Management Investors BV2014 LLC","reportingCik":"0001609495","personType":"OO","sharesOwned":59379,"percentOfClass":0.1,"filedAt":"2025-12-29","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000570","formType":"SCHEDULE 13D/A","amendmentNo":3,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-01","reportingPerson":"ANSBERT GADICKE","reportingCik":"0001134655","personType":"IN","sharesOwned":4867341,"percentOfClass":10,"filedAt":"2025-12-03","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000570","formType":"SCHEDULE 13D/A","amendmentNo":3,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-01","reportingPerson":"LUKE EVNIN","reportingCik":"0001134657","personType":"IN","sharesOwned":3121694,"percentOfClass":6.4,"filedAt":"2025-12-03","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000570","formType":"SCHEDULE 13D/A","amendmentNo":3,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-01","reportingPerson":"MPM BioVentures 2014 LLC","reportingCik":"0001765021","personType":"OO","sharesOwned":2324576,"percentOfClass":4.8,"filedAt":"2025-12-03","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000570","formType":"SCHEDULE 13D/A","amendmentNo":3,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-01","reportingPerson":"Todd Foley","reportingCik":"0001473930","personType":"IN","sharesOwned":2324576,"percentOfClass":4.8,"filedAt":"2025-12-03","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000570","formType":"SCHEDULE 13D/A","amendmentNo":3,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-01","reportingPerson":"MPM BioVentures 2014 GP LLC","reportingCik":"0001765091","personType":"OO","sharesOwned":2251912,"percentOfClass":4.6,"filedAt":"2025-12-03","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000570","formType":"SCHEDULE 13D/A","amendmentNo":3,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-01","reportingPerson":"MPM BioVentures 2014, L.P.","reportingCik":"0001609492","personType":"PN","sharesOwned":2111105,"percentOfClass":4.3,"filedAt":"2025-12-03","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000570","formType":"SCHEDULE 13D/A","amendmentNo":3,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-01","reportingPerson":"UBS Oncology Impact Fund L.P.","reportingCik":"0001691428","personType":"PN","sharesOwned":1745647,"percentOfClass":3.6,"filedAt":"2025-12-03","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000570","formType":"SCHEDULE 13D/A","amendmentNo":3,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-01","reportingPerson":"MPM BioImpact LLC","reportingCik":"0001687078","personType":"OO","sharesOwned":1745647,"percentOfClass":3.6,"filedAt":"2025-12-03","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000570","formType":"SCHEDULE 13D/A","amendmentNo":3,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-01","reportingPerson":"Oncology Impact Fund (Cayman) Management L.P.","reportingCik":"0001721036","personType":"PN","sharesOwned":1745647,"percentOfClass":3.6,"filedAt":"2025-12-03","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000570","formType":"SCHEDULE 13D/A","amendmentNo":3,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-01","reportingPerson":"MPM ONCOLOGY INNOVATIONS FUND LP","reportingCik":"0001719960","personType":"PN","sharesOwned":462816,"percentOfClass":1,"filedAt":"2025-12-03","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000570","formType":"SCHEDULE 13D/A","amendmentNo":3,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-01","reportingPerson":"MPM Oncology Innovations Fund GP LLC","reportingCik":"0001857903","personType":"OO","sharesOwned":462816,"percentOfClass":1,"filedAt":"2025-12-03","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000570","formType":"SCHEDULE 13D/A","amendmentNo":3,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-01","reportingPerson":"MPM ASSET MANAGEMENT LLC","reportingCik":"0001263048","personType":"OO","sharesOwned":334302,"percentOfClass":0.7,"filedAt":"2025-12-03","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000570","formType":"SCHEDULE 13D/A","amendmentNo":3,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-01","reportingPerson":"MPM BioVentures 2014 (B), L.P.","reportingCik":"0001609493","personType":"PN","sharesOwned":140807,"percentOfClass":0.3,"filedAt":"2025-12-03","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000570","formType":"SCHEDULE 13D/A","amendmentNo":3,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-12-01","reportingPerson":"MPM Asset Management Investors BV2014 LLC","reportingCik":"0001609495","personType":"OO","sharesOwned":72664,"percentOfClass":0.1,"filedAt":"2025-12-03","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000511","formType":"SCHEDULE 13D/A","amendmentNo":2,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-11-13","reportingPerson":"ANSBERT GADICKE","reportingCik":"0001134655","personType":"IN","sharesOwned":5481539,"percentOfClass":11.3,"filedAt":"2025-11-17","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000511","formType":"SCHEDULE 13D/A","amendmentNo":2,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-11-13","reportingPerson":"LUKE EVNIN","reportingCik":"0001134657","personType":"IN","sharesOwned":3515880,"percentOfClass":7.2,"filedAt":"2025-11-17","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000511","formType":"SCHEDULE 13D/A","amendmentNo":2,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-11-13","reportingPerson":"MPM BioVentures 2014 LLC","reportingCik":"0001765021","personType":"OO","sharesOwned":2617924,"percentOfClass":5.4,"filedAt":"2025-11-17","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000511","formType":"SCHEDULE 13D/A","amendmentNo":2,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-11-13","reportingPerson":"Todd Foley","reportingCik":"0001473930","personType":"IN","sharesOwned":2617924,"percentOfClass":5.4,"filedAt":"2025-11-17","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000511","formType":"SCHEDULE 13D/A","amendmentNo":2,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-11-13","reportingPerson":"MPM BioVentures 2014 GP LLC","reportingCik":"0001765091","personType":"OO","sharesOwned":2536092,"percentOfClass":5.2,"filedAt":"2025-11-17","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000511","formType":"SCHEDULE 13D/A","amendmentNo":2,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-11-13","reportingPerson":"MPM BioVentures 2014, L.P.","reportingCik":"0001609492","personType":"PN","sharesOwned":2377515,"percentOfClass":4.9,"filedAt":"2025-11-17","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000511","formType":"SCHEDULE 13D/A","amendmentNo":2,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-11-13","reportingPerson":"Oncology Impact Fund (Cayman) Management L.P.","reportingCik":"0001721036","personType":"PN","sharesOwned":1965659,"percentOfClass":4,"filedAt":"2025-11-17","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000511","formType":"SCHEDULE 13D/A","amendmentNo":2,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-11-13","reportingPerson":"MPM BioImpact LLC","reportingCik":"0001687078","personType":"OO","sharesOwned":1965659,"percentOfClass":4,"filedAt":"2025-11-17","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000511","formType":"SCHEDULE 13D/A","amendmentNo":2,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-11-13","reportingPerson":"UBS Oncology Impact Fund L.P.","reportingCik":"0001691428","personType":"PN","sharesOwned":1965659,"percentOfClass":4,"filedAt":"2025-11-17","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000511","formType":"SCHEDULE 13D/A","amendmentNo":2,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-11-13","reportingPerson":"MPM Oncology Innovations Fund GP LLC","reportingCik":"0001857903","personType":"OO","sharesOwned":521485,"percentOfClass":1.1,"filedAt":"2025-11-17","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000511","formType":"SCHEDULE 13D/A","amendmentNo":2,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-11-13","reportingPerson":"MPM ONCOLOGY INNOVATIONS FUND LP","reportingCik":"0001719960","personType":"PN","sharesOwned":521485,"percentOfClass":1.1,"filedAt":"2025-11-17","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000511","formType":"SCHEDULE 13D/A","amendmentNo":2,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-11-13","reportingPerson":"MPM ASSET MANAGEMENT LLC","reportingCik":"0001263048","personType":"OO","sharesOwned":376471,"percentOfClass":0.8,"filedAt":"2025-11-17","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000511","formType":"SCHEDULE 13D/A","amendmentNo":2,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-11-13","reportingPerson":"MPM BioVentures 2014 (B), L.P.","reportingCik":"0001609493","personType":"PN","sharesOwned":158577,"percentOfClass":0.3,"filedAt":"2025-11-17","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000511","formType":"SCHEDULE 13D/A","amendmentNo":2,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-11-13","reportingPerson":"MPM Asset Management Investors BV2014 LLC","reportingCik":"0001609495","personType":"OO","sharesOwned":81832,"percentOfClass":0.2,"filedAt":"2025-11-17","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-25-000040","formType":"SCHEDULE 13D/A","amendmentNo":7,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2025-11-04","reportingPerson":"RA Capital Management, L.P.","reportingCik":"0001346824","personType":"IA,PN","sharesOwned":6681307,"percentOfClass":13.8,"filedAt":"2025-11-06","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-25-000040","formType":"SCHEDULE 13D/A","amendmentNo":7,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2025-11-04","reportingPerson":"Rajeev Shah","reportingCik":"0001619841","personType":"HC,IN","sharesOwned":6681307,"percentOfClass":13.8,"filedAt":"2025-11-06","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-25-000040","formType":"SCHEDULE 13D/A","amendmentNo":7,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2025-11-04","reportingPerson":"Peter Kolchinsky","reportingCik":"0001384859","personType":"HC,IN","sharesOwned":6681307,"percentOfClass":13.8,"filedAt":"2025-11-06","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001346824-25-000040","formType":"SCHEDULE 13D/A","amendmentNo":7,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock, $0.0001 par value per share","eventDate":"2025-11-04","reportingPerson":"RA Capital Healthcare Fund, L.P.","reportingCik":"0001315082","personType":"PN","sharesOwned":6237482,"percentOfClass":12.9,"filedAt":"2025-11-06","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000422","formType":"SCHEDULE 13D/A","amendmentNo":1,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-10-31","reportingPerson":"ANSBERT GADICKE","reportingCik":"0001134655","personType":"IN","sharesOwned":6147610,"percentOfClass":13.4,"filedAt":"2025-11-04","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000422","formType":"SCHEDULE 13D/A","amendmentNo":1,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-10-31","reportingPerson":"LUKE EVNIN","reportingCik":"0001134657","personType":"IN","sharesOwned":3943359,"percentOfClass":8.6,"filedAt":"2025-11-04","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000422","formType":"SCHEDULE 13D/A","amendmentNo":1,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-10-31","reportingPerson":"MPM BioVentures 2014 LLC","reportingCik":"0001765021","personType":"OO","sharesOwned":2936048,"percentOfClass":6.4,"filedAt":"2025-11-04","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000422","formType":"SCHEDULE 13D/A","amendmentNo":1,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-10-31","reportingPerson":"Todd Foley","reportingCik":"0001473930","personType":"IN","sharesOwned":2936048,"percentOfClass":6.4,"filedAt":"2025-11-04","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000422","formType":"SCHEDULE 13D/A","amendmentNo":1,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-10-31","reportingPerson":"MPM BioVentures 2014 GP LLC","reportingCik":"0001765091","personType":"OO","sharesOwned":2844270,"percentOfClass":6.2,"filedAt":"2025-11-04","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000422","formType":"SCHEDULE 13D/A","amendmentNo":1,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-10-31","reportingPerson":"MPM BioVentures 2014, L.P.","reportingCik":"0001609492","personType":"PN","sharesOwned":2666424,"percentOfClass":5.8,"filedAt":"2025-11-04","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000422","formType":"SCHEDULE 13D/A","amendmentNo":1,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-10-31","reportingPerson":"UBS Oncology Impact Fund L.P.","reportingCik":"0001691428","personType":"PN","sharesOwned":2204251,"percentOfClass":4.8,"filedAt":"2025-11-04","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000422","formType":"SCHEDULE 13D/A","amendmentNo":1,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-10-31","reportingPerson":"MPM BioImpact LLC","reportingCik":"0001687078","personType":"OO","sharesOwned":2204251,"percentOfClass":4.8,"filedAt":"2025-11-04","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000422","formType":"SCHEDULE 13D/A","amendmentNo":1,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-10-31","reportingPerson":"Oncology Impact Fund (Cayman) Management L.P.","reportingCik":"0001721036","personType":"PN","sharesOwned":2204251,"percentOfClass":4.8,"filedAt":"2025-11-04","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000422","formType":"SCHEDULE 13D/A","amendmentNo":1,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-10-31","reportingPerson":"MPM ONCOLOGY INNOVATIONS FUND LP","reportingCik":"0001719960","personType":"PN","sharesOwned":585110,"percentOfClass":1.3,"filedAt":"2025-11-04","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000422","formType":"SCHEDULE 13D/A","amendmentNo":1,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-10-31","reportingPerson":"MPM Oncology Innovations Fund GP LLC","reportingCik":"0001857903","personType":"OO","sharesOwned":585110,"percentOfClass":1.3,"filedAt":"2025-11-04","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000422","formType":"SCHEDULE 13D/A","amendmentNo":1,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-10-31","reportingPerson":"MPM ASSET MANAGEMENT LLC","reportingCik":"0001263048","personType":"OO","sharesOwned":422201,"percentOfClass":0.9,"filedAt":"2025-11-04","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000422","formType":"SCHEDULE 13D/A","amendmentNo":1,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-10-31","reportingPerson":"MPM BioVentures 2014 (B), L.P.","reportingCik":"0001609493","personType":"PN","sharesOwned":177846,"percentOfClass":0.4,"filedAt":"2025-11-04","canonicalUrl":"https://xoomar.com/markets/stocks/howl"},{"accessionNo":"0001231919-25-000422","formType":"SCHEDULE 13D/A","amendmentNo":1,"issuerCik":"0001785530","issuerName":"WEREWOLF THERAPEUTICS, INC.","ticker":"HOWL","cusip":null,"securityClass":"Common Stock","eventDate":"2025-10-31","reportingPerson":"MPM Asset Management Investors BV2014 LLC","reportingCik":"0001609495","personType":"OO","sharesOwned":91778,"percentOfClass":0.2,"filedAt":"2025-11-04","canonicalUrl":"https://xoomar.com/markets/stocks/howl"}],"updatedAt":"2026-11-05T17:30:40.031Z","source":"xoomar.com","docs":"https://xoomar.com/markets/api","license":"https://xoomar.com/terms","attribution":"Credit XOOMAR with a link to the dataset page on xoomar.com when you republish this data","canonicalUrl":"https://xoomar.com/markets/stocks/howl","meta":{"source":"SEC","sourceAttribution":"Schedule 13D and 13G data: SEC.","notice":"10 requests a minute without a key, 30 with a free key. Get a free key at https://xoomar.com/signup?utm_source=api, register your app at https://xoomar.com/developers/register?utm_source=api, and credit the data as \"Data: XOOMAR\" together with the sourceAttribution line."}}