{"entity":{"type":"insider","cik":"0001741288","url":"/insider/0001741288","json_url":"/insider/0001741288.json","name":"COOKE MICHAEL P.","name_source":"as-filed","also_issuer":false,"cross_url":null},"coverage_statement":{"n_transactions":14,"n_filings":10,"first":"2019-06-18","last":"2019-12-02","span_basis":"filed_date"},"name_variants":[{"name":"COOKE MICHAEL P.","source":"filing","n_filings":10,"first_seen":"2019-06-18","last_seen":"2019-12-02"}],"transactions":[{"id":7796603,"accession":"0001562180-19-005782","txn_seq":3,"anchor":"line-3","filing_url":"/filing/0001562180-19-005782","line_url":"/filing/0001562180-19-005782","is_derivative":false,"issuer_cik":"0001690585","issuer_name":"Magenta Therapeutics, Inc.","issuer_ticker":"MGTA","issuer_name_source":null,"issuer_url":"/issuer/0001690585","owner_cik":"0001741288","owner_name":"COOKE MICHAEL P.","owner_display_name":"COOKE MICHAEL P.","owner_url":"/insider/0001741288","role":"Officer (Chief Scientific Officer)","role_mark":"O","role_mark_label":"Officer (Chief Scientific Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Scientific Officer","security_title":"common stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":7500.0,"shares_display":"7,500","price_per_share":13.00266852,"price_display":"13.00","price_state":"stated","total_value":97520.0139,"total_display":"97,520.01","total_whole":"97,520","shares_owned_after":244396.0,"shares_owned_after_display":"244,396","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-12-02","filed_date":"2019-12-02","scope":"insider","n_lines":3},{"id":8405018,"accession":"0001562180-19-005711","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001562180-19-005711","line_url":"/filing/0001562180-19-005711#line-1","is_derivative":false,"issuer_cik":"0001690585","issuer_name":"Magenta Therapeutics, Inc.","issuer_ticker":"MGTA","issuer_name_source":null,"issuer_url":"/issuer/0001690585","owner_cik":"0001741288","owner_name":"COOKE MICHAEL P.","owner_display_name":"COOKE MICHAEL P.","owner_url":"/insider/0001741288","role":"Officer (Chief Scientific Officer)","role_mark":"O","role_mark_label":"Officer (Chief Scientific Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Scientific Officer","security_title":"common stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":5000.0,"shares_display":"5,000","price_per_share":12.0,"price_display":"12.00","price_state":"stated","total_value":60000.0,"total_display":"60,000.00","total_whole":"60,000","shares_owned_after":248023.0,"shares_owned_after_display":"248,023","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-11-20","filed_date":"2019-11-25","scope":"insider"},{"id":7963148,"accession":"0001562180-19-005307","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001562180-19-005307","line_url":"/filing/0001562180-19-005307#line-1","is_derivative":false,"issuer_cik":"0001690585","issuer_name":"Magenta Therapeutics, Inc.","issuer_ticker":"MGTA","issuer_name_source":null,"issuer_url":"/issuer/0001690585","owner_cik":"0001741288","owner_name":"COOKE MICHAEL P.","owner_display_name":"COOKE MICHAEL P.","owner_url":"/insider/0001741288","role":"Officer (Chief Scientific Officer)","role_mark":"O","role_mark_label":"Officer (Chief Scientific Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Scientific Officer","security_title":"common stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":5000.0,"shares_display":"5,000","price_per_share":10.6667,"price_display":"10.67","price_state":"stated","total_value":53333.5,"total_display":"53,333.50","total_whole":"53,334","shares_owned_after":253023.0,"shares_owned_after_display":"253,023","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-11-01","filed_date":"2019-11-01","scope":"insider"},{"id":7938260,"accession":"0001562180-19-005101","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001562180-19-005101","line_url":"/filing/0001562180-19-005101#line-1","is_derivative":false,"issuer_cik":"0001690585","issuer_name":"Magenta Therapeutics, Inc.","issuer_ticker":"MGTA","issuer_name_source":null,"issuer_url":"/issuer/0001690585","owner_cik":"0001741288","owner_name":"COOKE MICHAEL P.","owner_display_name":"COOKE MICHAEL P.","owner_url":"/insider/0001741288","role":"Officer (Chief Scientific Officer)","role_mark":"O","role_mark_label":"Officer (Chief Scientific Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Scientific Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":5000.0,"shares_display":"5,000","price_per_share":10.0128,"price_display":"10.01","price_state":"stated","total_value":50064.0,"total_display":"50,064.00","total_whole":"50,064","shares_owned_after":258023.0,"shares_owned_after_display":"258,023","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-10-01","filed_date":"2019-10-03","scope":"insider"},{"id":8462926,"accession":"0001562180-19-004884","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001562180-19-004884","line_url":"/filing/0001562180-19-004884#line-1","is_derivative":false,"issuer_cik":"0001690585","issuer_name":"Magenta Therapeutics, Inc.","issuer_ticker":"MGTA","issuer_name_source":null,"issuer_url":"/issuer/0001690585","owner_cik":"0001741288","owner_name":"COOKE MICHAEL P.","owner_display_name":"COOKE MICHAEL P.","owner_url":"/insider/0001741288","role":"Officer (Chief Scientific Officer)","role_mark":"O","role_mark_label":"Officer (Chief Scientific Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Scientific Officer","security_title":"common stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1656.0,"shares_display":"1,656","price_per_share":12.0,"price_display":"12.00","price_state":"stated","total_value":19872.0,"total_display":"19,872.00","total_whole":"19,872","shares_owned_after":263023.0,"shares_owned_after_display":"263,023","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-09-19","filed_date":"2019-09-19","scope":"insider"},{"id":8747908,"accession":"0001562180-19-004830","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001562180-19-004830","line_url":"/filing/0001562180-19-004830#line-1","is_derivative":false,"issuer_cik":"0001690585","issuer_name":"Magenta Therapeutics, Inc.","issuer_ticker":"MGTA","issuer_name_source":null,"issuer_url":"/issuer/0001690585","owner_cik":"0001741288","owner_name":"COOKE MICHAEL P.","owner_display_name":"COOKE MICHAEL P.","owner_url":"/insider/0001741288","role":"Officer (Chief Scientific Officer)","role_mark":"O","role_mark_label":"Officer (Chief Scientific Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Scientific Officer","security_title":"common stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":844.0,"shares_display":"844","price_per_share":12.0,"price_display":"12.00","price_state":"stated","total_value":10128.0,"total_display":"10,128.00","total_whole":"10,128","shares_owned_after":264679.0,"shares_owned_after_display":"264,679","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-09-12","filed_date":"2019-09-16","scope":"insider"},{"id":8506250,"accession":"0001562180-19-004630","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001562180-19-004630","line_url":"/filing/0001562180-19-004630#line-1","is_derivative":false,"issuer_cik":"0001690585","issuer_name":"Magenta Therapeutics, Inc.","issuer_ticker":"MGTA","issuer_name_source":null,"issuer_url":"/issuer/0001690585","owner_cik":"0001741288","owner_name":"COOKE MICHAEL P.","owner_display_name":"COOKE MICHAEL P.","owner_url":"/insider/0001741288","role":"Officer (Chief Scientific Officer)","role_mark":"O","role_mark_label":"Officer (Chief Scientific Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Scientific Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":5000.0,"shares_display":"5,000","price_per_share":10.1062,"price_display":"10.11","price_state":"stated","total_value":50531.0,"total_display":"50,531.00","total_whole":"50,531","shares_owned_after":265523.0,"shares_owned_after_display":"265,523","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-09-03","filed_date":"2019-09-04","scope":"insider"},{"id":8307810,"accession":"0001562180-19-004122","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001562180-19-004122","line_url":"/filing/0001562180-19-004122","is_derivative":false,"issuer_cik":"0001690585","issuer_name":"Magenta Therapeutics, Inc.","issuer_ticker":"MGTA","issuer_name_source":null,"issuer_url":"/issuer/0001690585","owner_cik":"0001741288","owner_name":"COOKE MICHAEL P.","owner_display_name":"COOKE MICHAEL P.","owner_url":"/insider/0001741288","role":"Officer (Chief Scientific Officer)","role_mark":"O","role_mark_label":"Officer (Chief Scientific Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Scientific Officer","security_title":"common stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":7500.0,"shares_display":"7,500","price_per_share":13.417466666666666,"price_display":"13.42","price_state":"stated","total_value":100631.0,"total_display":"100,631.00","total_whole":"100,631","shares_owned_after":273023.0,"shares_owned_after_display":"273,023","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-08-01","filed_date":"2019-08-01","scope":"insider","n_lines":2},{"id":8228709,"accession":"0001562180-19-003734","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001562180-19-003734","line_url":"/filing/0001562180-19-003734","is_derivative":false,"issuer_cik":"0001690585","issuer_name":"Magenta Therapeutics, Inc.","issuer_ticker":"MGTA","issuer_name_source":null,"issuer_url":"/issuer/0001690585","owner_cik":"0001741288","owner_name":"COOKE MICHAEL P.","owner_display_name":"COOKE MICHAEL P.","owner_url":"/insider/0001741288","role":"Officer (Chief Scientific Officer)","role_mark":"O","role_mark_label":"Officer (Chief Scientific Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Scientific Officer","security_title":"common stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":7500.0,"shares_display":"7,500","price_per_share":14.397733333333333,"price_display":"14.40","price_state":"stated","total_value":107983.0,"total_display":"107,983.00","total_whole":"107,983","shares_owned_after":280523.0,"shares_owned_after_display":"280,523","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-07-01","filed_date":"2019-07-02","scope":"insider","n_lines":2},{"id":8228694,"accession":"0001562180-19-003585","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001562180-19-003585","line_url":"/filing/0001562180-19-003585#line-1","is_derivative":false,"issuer_cik":"0001690585","issuer_name":"Magenta Therapeutics, Inc.","issuer_ticker":"MGTA","issuer_name_source":null,"issuer_url":"/issuer/0001690585","owner_cik":"0001741288","owner_name":"COOKE MICHAEL P.","owner_display_name":"COOKE MICHAEL P.","owner_url":"/insider/0001741288","role":"Officer (Chief Scientific Officer)","role_mark":"O","role_mark_label":"Officer (Chief Scientific Officer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Scientific Officer","security_title":"common stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":7500.0,"shares_display":"7,500","price_per_share":13.9023,"price_display":"13.90","price_state":"stated","total_value":104267.25,"total_display":"104,267.25","total_whole":"104,267","shares_owned_after":285523.0,"shares_owned_after_display":"285,523","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-06-17","filed_date":"2019-06-18","scope":"insider"}],"collapsed":true,"next_cursor":null,"ledger_fault":false,"count":{"value":14,"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":14,"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":14},"affiliations":[{"type":"issuer","type_label":"ISSUER","cik":"0001690585","name":"Magenta Therapeutics, Inc.","url":"/issuer/0001690585","role":"Officer (Chief Scientific Officer)","n_filings":10,"first_seen":"2019-06-18","last_seen":"2019-12-02"}],"order_statement":"Newest transaction date first, id breaking the tie.","canonical_url":"https://ebomi.com/insider/0001741288","retrieved_at":"2026-08-25T14:36:22+00:00","coverage":{"filings":1506293,"transactions":4290787,"issuers":28597,"insiders":152303,"first_filed_date":"2003-06-30","last_filed_date":"2026-08-24","last_ingest":"2026-08-25T05:24:19.374141+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"}}