{"entity":{"type":"insider","cik":"0001645755","url":"/insider/0001645755","json_url":"/insider/0001645755.json","name":"Carvajal Alejandra","name_source":"as-filed","also_issuer":false,"cross_url":null},"coverage_statement":{"n_transactions":23,"n_filings":22,"first":"2019-02-14","last":"2025-01-17","span_basis":"filed_date"},"name_variants":[{"name":"Carvajal Alejandra","source":"filing","n_filings":22,"first_seen":"2019-02-14","last_seen":"2025-01-17"}],"transactions":[{"id":4111368,"accession":"0001104659-25-004591","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001104659-25-004591","line_url":"/filing/0001104659-25-004591#line-2","is_derivative":false,"issuer_cik":"0001442836","issuer_name":"Mersana Therapeutics, Inc.","issuer_ticker":"MRSN","issuer_name_source":null,"issuer_url":"/issuer/0001442836","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (SVP, Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (SVP, Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"SVP, Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":5096.0,"shares_display":"5,096","price_per_share":0.58,"price_display":"0.58","price_state":"stated","total_value":2955.68,"total_display":"2,955.68","total_whole":"2,956","shares_owned_after":78296.0,"shares_owned_after_display":"78,296","ownership_form":"D","is_10b5_1":null,"transaction_date":"2025-01-16","filed_date":"2025-01-17","scope":"insider"},{"id":4875143,"accession":"0001104659-25-004180","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001104659-25-004180","line_url":"/filing/0001104659-25-004180#line-2","is_derivative":false,"issuer_cik":"0001442836","issuer_name":"Mersana Therapeutics, Inc.","issuer_ticker":"MRSN","issuer_name_source":null,"issuer_url":"/issuer/0001442836","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (SVP, Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (SVP, Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"SVP, Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":952.0,"shares_display":"952","price_per_share":0.63,"price_display":"0.63","price_state":"stated","total_value":599.76,"total_display":"599.76","total_whole":"600","shares_owned_after":70892.0,"shares_owned_after_display":"70,892","ownership_form":"D","is_10b5_1":null,"transaction_date":"2025-01-15","filed_date":"2025-01-16","scope":"insider"},{"id":4955245,"accession":"0001104659-25-003876","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001104659-25-003876","line_url":"/filing/0001104659-25-003876#line-2","is_derivative":false,"issuer_cik":"0001442836","issuer_name":"Mersana Therapeutics, Inc.","issuer_ticker":"MRSN","issuer_name_source":null,"issuer_url":"/issuer/0001442836","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (SVP, Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (SVP, Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"SVP, Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":3330.0,"shares_display":"3,330","price_per_share":0.66,"price_display":"0.66","price_state":"stated","total_value":2197.8,"total_display":"2,197.80","total_whole":"2,198","shares_owned_after":69344.0,"shares_owned_after_display":"69,344","ownership_form":"D","is_10b5_1":null,"transaction_date":"2025-01-14","filed_date":"2025-01-15","scope":"insider"},{"id":2086256,"accession":"0001104659-24-106750","txn_seq":3,"anchor":"line-3","filing_url":"/filing/0001104659-24-106750","line_url":"/filing/0001104659-24-106750#line-3","is_derivative":false,"issuer_cik":"0001442836","issuer_name":"Mersana Therapeutics, Inc.","issuer_ticker":"MRSN","issuer_name_source":null,"issuer_url":"/issuer/0001442836","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (SVP, Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (SVP, Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"SVP, Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":5598.0,"shares_display":"5,598","price_per_share":1.96,"price_display":"1.96","price_state":"stated","total_value":10972.08,"total_display":"10,972.08","total_whole":"10,972","shares_owned_after":63716.0,"shares_owned_after_display":"63,716","ownership_form":"D","is_10b5_1":null,"transaction_date":"2024-10-03","filed_date":"2024-10-07","scope":"insider"},{"id":2086254,"accession":"0001104659-24-106750","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001104659-24-106750","line_url":"/filing/0001104659-24-106750#line-2","is_derivative":false,"issuer_cik":"0001442836","issuer_name":"Mersana Therapeutics, Inc.","issuer_ticker":"MRSN","issuer_name_source":null,"issuer_url":"/issuer/0001442836","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (SVP, Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (SVP, Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"SVP, Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":8089.0,"shares_display":"8,089","price_per_share":2.0,"price_display":"2.00","price_state":"stated","total_value":16178.0,"total_display":"16,178.00","total_whole":"16,178","shares_owned_after":69314.0,"shares_owned_after_display":"69,314","ownership_form":"D","is_10b5_1":null,"transaction_date":"2024-10-02","filed_date":"2024-10-07","scope":"insider"},{"id":2146374,"accession":"0001104659-24-004543","txn_seq":3,"anchor":"line-3","filing_url":"/filing/0001104659-24-004543","line_url":"/filing/0001104659-24-004543#line-3","is_derivative":false,"issuer_cik":"0001442836","issuer_name":"Mersana Therapeutics, Inc.","issuer_ticker":"MRSN","issuer_name_source":null,"issuer_url":"/issuer/0001442836","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (SVP, Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (SVP, Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"SVP, Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":4381.0,"shares_display":"4,381","price_per_share":2.71,"price_display":"2.71","price_state":"stated","total_value":11872.51,"total_display":"11,872.51","total_whole":"11,873","shares_owned_after":27403.0,"shares_owned_after_display":"27,403","ownership_form":"D","is_10b5_1":null,"transaction_date":"2024-01-16","filed_date":"2024-01-17","scope":"insider"},{"id":8319103,"accession":"0001104659-23-052984","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001104659-23-052984","line_url":"/filing/0001104659-23-052984#line-2","is_derivative":false,"issuer_cik":"0001442836","issuer_name":"Mersana Therapeutics, Inc.","issuer_ticker":"MRSN","issuer_name_source":null,"issuer_url":"/issuer/0001442836","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (SVP, Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (SVP, Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"SVP, Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":3944.0,"shares_display":"3,944","price_per_share":3.89,"price_display":"3.89","price_state":"stated","total_value":15342.16,"total_display":"15,342.16","total_whole":"15,342","shares_owned_after":20326.0,"shares_owned_after_display":"20,326","ownership_form":"D","is_10b5_1":null,"transaction_date":"2023-04-27","filed_date":"2023-04-28","scope":"insider"},{"id":8014260,"accession":"0001104659-23-004736","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001104659-23-004736","line_url":"/filing/0001104659-23-004736#line-2","is_derivative":false,"issuer_cik":"0001442836","issuer_name":"Mersana Therapeutics, Inc.","issuer_ticker":"MRSN","issuer_name_source":null,"issuer_url":"/issuer/0001442836","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (SVP, Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (SVP, Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"SVP, Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":782.0,"shares_display":"782","price_per_share":5.74,"price_display":"5.74","price_state":"stated","total_value":4488.68,"total_display":"4,488.68","total_whole":"4,489","shares_owned_after":11020.0,"shares_owned_after_display":"11,020","ownership_form":"D","is_10b5_1":null,"transaction_date":"2023-01-17","filed_date":"2023-01-18","scope":"insider"},{"id":6680312,"accession":"0001104659-22-052419","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001104659-22-052419","line_url":"/filing/0001104659-22-052419#line-2","is_derivative":false,"issuer_cik":"0001442836","issuer_name":"Mersana Therapeutics, Inc.","issuer_ticker":"MRSN","issuer_name_source":null,"issuer_url":"/issuer/0001442836","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":3948.0,"shares_display":"3,948","price_per_share":3.69,"price_display":"3.69","price_state":"stated","total_value":14568.12,"total_display":"14,568.12","total_whole":"14,568","shares_owned_after":9302.0,"shares_owned_after_display":"9,302","ownership_form":"D","is_10b5_1":null,"transaction_date":"2022-04-26","filed_date":"2022-04-28","scope":"insider"},{"id":2184419,"accession":"0001179110-20-008393","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001179110-20-008393","line_url":"/filing/0001179110-20-008393#line-2","is_derivative":false,"issuer_cik":"0001235010","issuer_name":"MOMENTA PHARMACEUTICALS INC","issuer_ticker":"MNTA","issuer_name_source":null,"issuer_url":"/issuer/0001235010","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1087.0,"shares_display":"1,087","price_per_share":33.95,"price_display":"33.95","price_state":"stated","total_value":36903.65,"total_display":"36,903.65","total_whole":"36,904","shares_owned_after":28795.0,"shares_owned_after_display":"28,795","ownership_form":"D","is_10b5_1":null,"transaction_date":"2020-07-20","filed_date":"2020-07-21","scope":"insider"},{"id":3171688,"accession":"0001104659-20-080017","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001104659-20-080017","line_url":"/filing/0001104659-20-080017#line-2","is_derivative":false,"issuer_cik":"0001235010","issuer_name":"MOMENTA PHARMACEUTICALS INC","issuer_ticker":"MNTA","issuer_name_source":null,"issuer_url":"/issuer/0001235010","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":6811.0,"shares_display":"6,811","price_per_share":35.1,"price_display":"35.10","price_state":"stated","total_value":239066.1,"total_display":"239,066.10","total_whole":"239,066","shares_owned_after":27445.0,"shares_owned_after_display":"27,445","ownership_form":"D","is_10b5_1":null,"transaction_date":"2020-06-30","filed_date":"2020-07-01","scope":"insider"},{"id":3336925,"accession":"0001179110-20-007360","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001179110-20-007360","line_url":"/filing/0001179110-20-007360#line-2","is_derivative":false,"issuer_cik":"0001235010","issuer_name":"MOMENTA PHARMACEUTICALS INC","issuer_ticker":"MNTA","issuer_name_source":null,"issuer_url":"/issuer/0001235010","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":6756.0,"shares_display":"6,756","price_per_share":30.15,"price_display":"30.15","price_state":"stated","total_value":203693.4,"total_display":"203,693.40","total_whole":"203,693","shares_owned_after":19256.0,"shares_owned_after_display":"19,256","ownership_form":"D","is_10b5_1":null,"transaction_date":"2020-06-12","filed_date":"2020-06-15","scope":"insider"},{"id":2484712,"accession":"0001179110-20-005001","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001179110-20-005001","line_url":"/filing/0001179110-20-005001#line-2","is_derivative":false,"issuer_cik":"0001235010","issuer_name":"MOMENTA PHARMACEUTICALS INC","issuer_ticker":"MNTA","issuer_name_source":null,"issuer_url":"/issuer/0001235010","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1124.0,"shares_display":"1,124","price_per_share":28.97,"price_display":"28.97","price_state":"stated","total_value":32562.28,"total_display":"32,562.28","total_whole":"32,562","shares_owned_after":11012.0,"shares_owned_after_display":"11,012","ownership_form":"D","is_10b5_1":null,"transaction_date":"2020-04-20","filed_date":"2020-04-21","scope":"insider"},{"id":2184108,"accession":"0001179110-20-003311","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001179110-20-003311","line_url":"/filing/0001179110-20-003311#line-2","is_derivative":false,"issuer_cik":"0001235010","issuer_name":"MOMENTA PHARMACEUTICALS INC","issuer_ticker":"MNTA","issuer_name_source":null,"issuer_url":"/issuer/0001235010","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":5302.0,"shares_display":"5,302","price_per_share":29.0,"price_display":"29.00","price_state":"stated","total_value":153758.0,"total_display":"153,758.00","total_whole":"153,758","shares_owned_after":9698.0,"shares_owned_after_display":"9,698","ownership_form":"D","is_10b5_1":null,"transaction_date":"2020-03-06","filed_date":"2020-03-09","scope":"insider"},{"id":2815827,"accession":"0001179110-20-001910","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001179110-20-001910","line_url":"/filing/0001179110-20-001910#line-1","is_derivative":false,"issuer_cik":"0001235010","issuer_name":"MOMENTA PHARMACEUTICALS INC","issuer_ticker":"MNTA","issuer_name_source":null,"issuer_url":"/issuer/0001235010","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":6892.0,"shares_display":"6,892","price_per_share":31.54,"price_display":"31.54","price_state":"stated","total_value":217373.68,"total_display":"217,373.68","total_whole":"217,374","shares_owned_after":0.0,"shares_owned_after_display":"0","ownership_form":"D","is_10b5_1":null,"transaction_date":"2020-02-14","filed_date":"2020-02-19","scope":"insider"},{"id":2150376,"accession":"0001179110-20-001661","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001179110-20-001661","line_url":"/filing/0001179110-20-001661#line-2","is_derivative":false,"issuer_cik":"0001235010","issuer_name":"MOMENTA PHARMACEUTICALS INC","issuer_ticker":"MNTA","issuer_name_source":null,"issuer_url":"/issuer/0001235010","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":3108.0,"shares_display":"3,108","price_per_share":30.03,"price_display":"30.03","price_state":"stated","total_value":93333.24,"total_display":"93,333.24","total_whole":"93,333","shares_owned_after":6892.0,"shares_owned_after_display":"6,892","ownership_form":"D","is_10b5_1":null,"transaction_date":"2020-02-13","filed_date":"2020-02-14","scope":"insider"},{"id":2309372,"accession":"0001179110-20-000763","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001179110-20-000763","line_url":"/filing/0001179110-20-000763#line-1","is_derivative":false,"issuer_cik":"0001235010","issuer_name":"MOMENTA PHARMACEUTICALS INC","issuer_ticker":"MNTA","issuer_name_source":null,"issuer_url":"/issuer/0001235010","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1577.0,"shares_display":"1,577","price_per_share":28.98,"price_display":"28.98","price_state":"stated","total_value":45701.46,"total_display":"45,701.46","total_whole":"45,701","shares_owned_after":0.0,"shares_owned_after_display":"0","ownership_form":"D","is_10b5_1":null,"transaction_date":"2020-01-22","filed_date":"2020-01-24","scope":"insider"},{"id":3230974,"accession":"0001179110-20-000702","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001179110-20-000702","line_url":"/filing/0001179110-20-000702#line-2","is_derivative":false,"issuer_cik":"0001235010","issuer_name":"MOMENTA PHARMACEUTICALS INC","issuer_ticker":"MNTA","issuer_name_source":null,"issuer_url":"/issuer/0001235010","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":860.0,"shares_display":"860","price_per_share":30.08,"price_display":"30.08","price_state":"stated","total_value":25868.8,"total_display":"25,868.80","total_whole":"25,869","shares_owned_after":1577.0,"shares_owned_after_display":"1,577","ownership_form":"D","is_10b5_1":null,"transaction_date":"2020-01-21","filed_date":"2020-01-22","scope":"insider"},{"id":8097486,"accession":"0001179110-19-011211","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001179110-19-011211","line_url":"/filing/0001179110-19-011211#line-1","is_derivative":false,"issuer_cik":"0001235010","issuer_name":"MOMENTA PHARMACEUTICALS INC","issuer_ticker":"MNTA","issuer_name_source":null,"issuer_url":"/issuer/0001235010","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":6814.0,"shares_display":"6,814","price_per_share":14.4,"price_display":"14.40","price_state":"stated","total_value":98121.6,"total_display":"98,121.60","total_whole":"98,122","shares_owned_after":0.0,"shares_owned_after_display":"0","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-10-21","filed_date":"2019-10-23","scope":"insider"},{"id":8752027,"accession":"0001179110-19-011132","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001179110-19-011132","line_url":"/filing/0001179110-19-011132#line-2","is_derivative":false,"issuer_cik":"0001235010","issuer_name":"MOMENTA PHARMACEUTICALS INC","issuer_ticker":"MNTA","issuer_name_source":null,"issuer_url":"/issuer/0001235010","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":2936.0,"shares_display":"2,936","price_per_share":13.83,"price_display":"13.83","price_state":"stated","total_value":40604.88,"total_display":"40,604.88","total_whole":"40,605","shares_owned_after":6814.0,"shares_owned_after_display":"6,814","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-10-18","filed_date":"2019-10-21","scope":"insider"},{"id":8158020,"accession":"0001179110-19-005357","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001179110-19-005357","line_url":"/filing/0001179110-19-005357#line-1","is_derivative":false,"issuer_cik":"0001235010","issuer_name":"MOMENTA PHARMACEUTICALS INC","issuer_ticker":"MNTA","issuer_name_source":null,"issuer_url":"/issuer/0001235010","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":10384.0,"shares_display":"10,384","price_per_share":14.77,"price_display":"14.77","price_state":"stated","total_value":153371.68,"total_display":"153,371.68","total_whole":"153,372","shares_owned_after":0.0,"shares_owned_after_display":"0","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-04-29","filed_date":"2019-05-01","scope":"insider"},{"id":7824599,"accession":"0001179110-19-002086","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001179110-19-002086","line_url":"/filing/0001179110-19-002086#line-1","is_derivative":false,"issuer_cik":"0001235010","issuer_name":"MOMENTA PHARMACEUTICALS INC","issuer_ticker":"MNTA","issuer_name_source":null,"issuer_url":"/issuer/0001235010","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":703.0,"shares_display":"703","price_per_share":13.1,"price_display":"13.10","price_state":"stated","total_value":9209.3,"total_display":"9,209.30","total_whole":"9,209","shares_owned_after":15108.0,"shares_owned_after_display":"15,108","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-02-14","filed_date":"2019-02-19","scope":"insider"},{"id":8097023,"accession":"0001179110-19-001905","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001179110-19-001905","line_url":"/filing/0001179110-19-001905#line-2","is_derivative":false,"issuer_cik":"0001235010","issuer_name":"MOMENTA PHARMACEUTICALS INC","issuer_ticker":"MNTA","issuer_name_source":null,"issuer_url":"/issuer/0001235010","owner_cik":"0001645755","owner_name":"Carvajal Alejandra","owner_display_name":"Carvajal Alejandra","owner_url":"/insider/0001645755","role":"Officer (Chief Legal Officer)","role_mark":"O","role_mark_label":"Officer (Chief Legal Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Legal Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":2938.0,"shares_display":"2,938","price_per_share":12.7,"price_display":"12.70","price_state":"stated","total_value":37312.6,"total_display":"37,312.60","total_whole":"37,313","shares_owned_after":15811.0,"shares_owned_after_display":"15,811","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-02-13","filed_date":"2019-02-14","scope":"insider"}],"collapsed":true,"next_cursor":null,"ledger_fault":false,"count":{"value":23,"kind":"exact"},"open_market_only":false,"composition":{"kind":"exact","rows":[{"code":"P","label":"Open-market purchase","n":0,"open_market":true},{"code":"S","label":"Open-market sale","n":23,"open_market":true},{"code":"M","label":"Option exercise","n":0,"open_market":false},{"code":"A","label":"Grant or award","n":0,"open_market":false},{"code":"F","label":"Tax withholding","n":0,"open_market":false},{"code":"D","label":"Disposition to the issuer","n":0,"open_market":false},{"code":"X","label":"In-the-money option exercise","n":0,"open_market":false}],"total":23},"affiliations":[{"type":"issuer","type_label":"ISSUER","cik":"0001442836","name":"Mersana Therapeutics, Inc.","url":"/issuer/0001442836","role":"Officer (SVP, Chief Legal Officer)","n_filings":8,"first_seen":"2022-04-28","last_seen":"2025-01-17"},{"type":"issuer","type_label":"ISSUER","cik":"0001235010","name":"MOMENTA PHARMACEUTICALS INC","url":"/issuer/0001235010","role":"Officer (Chief Legal Officer)","n_filings":14,"first_seen":"2019-02-14","last_seen":"2020-07-21"}],"order_statement":"Newest transaction date first, id breaking the tie.","canonical_url":"https://ebomi.com/insider/0001645755","retrieved_at":"2026-08-22T08:08:01+00:00","coverage":{"filings":1505395,"transactions":4290787,"issuers":28597,"insiders":152303,"first_filed_date":"2003-06-30","last_filed_date":"2026-08-21","last_ingest":"2026-08-22T05:23:40.159918+00:00","counts_are":{"filings":"estimate","transactions":"estimate","issuers":"estimate","insiders":"estimate"},"source":"SEC EDGAR Form 4 filings, parsed by ebomi","fault":false},"license":{"underlying_records":"US SEC filings are public records of the United States government and are not subject to copyright. The transactional facts in them are not ours to license.","this_presentation":"The parsing, normalisation, curation, and presentation are ebomi's own work.","grant":"undecided","grant_note":"The open licence for ebomi's own layer is an open owner decision (SPEC-20260731T1159Z open question 3: CC BY 4.0 or CC0 with a citation request). Until it is taken, no grant is asserted here.","citation_request":"Balogh, A. Insider trading. Scientific Data 10, 237 (2023)","url":"https://ebomi.com/license"},"fair_use":{"policy":"These JSON endpoints are open and unauthenticated. Please read them at a human pace, identify your client in the User-Agent header, and use the published dataset for bulk work rather than crawling page by page.","bulk_alternative":"doi:10.1038/s41597-023-02147-6"}}