{"entity":{"type":"insider","cik":"0002018699","url":"/insider/0002018699","json_url":"/insider/0002018699.json","name":"Harler Mary Beth","name_source":"as-filed","also_issuer":false,"cross_url":null},"coverage_statement":{"n_transactions":6,"n_filings":6,"first":"2024-06-18","last":"2025-07-25","span_basis":"filed_date"},"name_variants":[{"name":"Harler Mary Beth","source":"filing","n_filings":6,"first_seen":"2024-06-18","last_seen":"2025-07-25"}],"transactions":[{"id":4684138,"accession":"0001415889-25-020310","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001415889-25-020310","line_url":"/filing/0001415889-25-020310#line-1","is_derivative":false,"issuer_cik":"0001496323","issuer_name":"IGM Biosciences, Inc.","issuer_ticker":"IGMS","issuer_name_source":null,"issuer_url":"/issuer/0001496323","owner_cik":"0002018699","owner_name":"Harler Mary Beth","owner_display_name":"Harler Mary Beth","owner_url":"/insider/0002018699","role":"Director, Officer (Chief Executive Officer)","role_mark":"D","role_mark_label":"Director","role_mark_generic":"Director","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Executive Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":14501.0,"shares_display":"14,501","price_per_share":1.2728,"price_display":"1.27","price_state":"stated","total_value":18456.8728,"total_display":"18,456.87","total_whole":"18,457","shares_owned_after":323680.0,"shares_owned_after_display":"323,680","ownership_form":"D","is_10b5_1":null,"transaction_date":"2025-07-23","filed_date":"2025-07-25","scope":"insider"},{"id":4770702,"accession":"0001415889-25-017913","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001415889-25-017913","line_url":"/filing/0001415889-25-017913#line-1","is_derivative":false,"issuer_cik":"0001496323","issuer_name":"IGM Biosciences, Inc.","issuer_ticker":"IGMS","issuer_name_source":null,"issuer_url":"/issuer/0001496323","owner_cik":"0002018699","owner_name":"Harler Mary Beth","owner_display_name":"Harler Mary Beth","owner_url":"/insider/0002018699","role":"Director, Officer (Chief Executive Officer)","role_mark":"D","role_mark_label":"Director","role_mark_generic":"Director","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Executive Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1522.0,"shares_display":"1,522","price_per_share":1.1992,"price_display":"1.20","price_state":"stated","total_value":1825.1824,"total_display":"1,825.18","total_whole":"1,825","shares_owned_after":338181.0,"shares_owned_after_display":"338,181","ownership_form":"D","is_10b5_1":null,"transaction_date":"2025-06-16","filed_date":"2025-06-20","scope":"insider"},{"id":4280990,"accession":"0001415889-25-008519","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001415889-25-008519","line_url":"/filing/0001415889-25-008519#line-1","is_derivative":false,"issuer_cik":"0001496323","issuer_name":"IGM Biosciences, Inc.","issuer_ticker":"IGMS","issuer_name_source":null,"issuer_url":"/issuer/0001496323","owner_cik":"0002018699","owner_name":"Harler Mary Beth","owner_display_name":"Harler Mary Beth","owner_url":"/insider/0002018699","role":"Director, Officer (Chief Executive Officer)","role_mark":"D","role_mark_label":"Director","role_mark_generic":"Director","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Executive Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":7329.0,"shares_display":"7,329","price_per_share":1.23,"price_display":"1.23","price_state":"stated","total_value":9014.67,"total_display":"9,014.67","total_whole":"9,015","shares_owned_after":339703.0,"shares_owned_after_display":"339,703","ownership_form":"D","is_10b5_1":null,"transaction_date":"2025-03-14","filed_date":"2025-03-18","scope":"insider"},{"id":3179538,"accession":"0001415889-24-029776","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001415889-24-029776","line_url":"/filing/0001415889-24-029776#line-1","is_derivative":false,"issuer_cik":"0001496323","issuer_name":"IGM Biosciences, Inc.","issuer_ticker":"IGMS","issuer_name_source":null,"issuer_url":"/issuer/0001496323","owner_cik":"0002018699","owner_name":"Harler Mary Beth","owner_display_name":"Harler Mary Beth","owner_url":"/insider/0002018699","role":"Director, Officer (Chief Executive Officer)","role_mark":"D","role_mark_label":"Director","role_mark_generic":"Director","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Chief Executive Officer","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1708.0,"shares_display":"1,708","price_per_share":7.48,"price_display":"7.48","price_state":"stated","total_value":12775.84,"total_display":"12,775.84","total_whole":"12,776","shares_owned_after":347032.0,"shares_owned_after_display":"347,032","ownership_form":"D","is_10b5_1":null,"transaction_date":"2024-12-16","filed_date":"2024-12-18","scope":"insider"},{"id":2156672,"accession":"0001415889-24-023583","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001415889-24-023583","line_url":"/filing/0001415889-24-023583#line-1","is_derivative":false,"issuer_cik":"0001496323","issuer_name":"IGM Biosciences, Inc.","issuer_ticker":"IGMS","issuer_name_source":null,"issuer_url":"/issuer/0001496323","owner_cik":"0002018699","owner_name":"Harler Mary Beth","owner_display_name":"Harler Mary Beth","owner_url":"/insider/0002018699","role":"Officer (Head, Research & Autoimmunity)","role_mark":"O","role_mark_label":"Officer (Head, Research & Autoimmunity)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Head, Research & Autoimmunity","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1487.0,"shares_display":"1,487","price_per_share":11.5388,"price_display":"11.54","price_state":"stated","total_value":17158.1956,"total_display":"17,158.20","total_whole":"17,158","shares_owned_after":163740.0,"shares_owned_after_display":"163,740","ownership_form":"D","is_10b5_1":null,"transaction_date":"2024-09-13","filed_date":"2024-09-17","scope":"insider"},{"id":2131951,"accession":"0001415889-24-017496","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001415889-24-017496","line_url":"/filing/0001415889-24-017496#line-1","is_derivative":false,"issuer_cik":"0001496323","issuer_name":"IGM Biosciences, Inc.","issuer_ticker":"IGMS","issuer_name_source":null,"issuer_url":"/issuer/0001496323","owner_cik":"0002018699","owner_name":"Harler Mary Beth","owner_display_name":"Harler Mary Beth","owner_url":"/insider/0002018699","role":"Officer (Head, Research & Autoimmunity)","role_mark":"O","role_mark_label":"Officer (Head, Research & Autoimmunity)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Head, Research & Autoimmunity","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1570.0,"shares_display":"1,570","price_per_share":7.5753,"price_display":"7.58","price_state":"stated","total_value":11893.221,"total_display":"11,893.22","total_whole":"11,893","shares_owned_after":85227.0,"shares_owned_after_display":"85,227","ownership_form":"D","is_10b5_1":null,"transaction_date":"2024-06-14","filed_date":"2024-06-18","scope":"insider"}],"collapsed":true,"next_cursor":null,"ledger_fault":false,"count":{"value":6,"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":6,"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":6},"affiliations":[{"type":"issuer","type_label":"ISSUER","cik":"0001496323","name":"IGM Biosciences, Inc.","url":"/issuer/0001496323","role":"Director, Officer (Chief Executive Officer)","n_filings":6,"first_seen":"2024-06-18","last_seen":"2025-07-25"}],"order_statement":"Newest transaction date first, id breaking the tie.","canonical_url":"https://ebomi.com/insider/0002018699","retrieved_at":"2026-08-27T20:20:24+00:00","coverage":{"filings":1506293,"transactions":4290787,"issuers":28597,"insiders":152303,"first_filed_date":"2003-06-30","last_filed_date":"2026-08-26","last_ingest":"2026-08-27T05:24:39.644631+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"}}