{"entity":{"type":"insider","cik":"0001350876","url":"/insider/0001350876","json_url":"/insider/0001350876.json","name":"Knopper Douglas S","name_source":"as-filed","also_issuer":false,"cross_url":null},"coverage_statement":{"n_transactions":9,"n_filings":5,"first":"2021-04-07","last":"2026-08-07","span_basis":"filed_date"},"name_variants":[{"name":"Knopper Douglas S","source":"filing","n_filings":5,"first_seen":"2021-04-07","last_seen":"2026-08-07"}],"transactions":[{"id":6043142,"accession":"0001350876-26-000003","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001350876-26-000003","line_url":"/filing/0001350876-26-000003#line-1","is_derivative":false,"issuer_cik":"0001350876","issuer_name":"MAGNITE, INC.","issuer_ticker":"MGNI","issuer_name_source":null,"issuer_url":"/issuer/0001350876","owner_cik":"0001350876","owner_name":"Knopper Douglas S","owner_display_name":"Knopper Douglas S","owner_url":"/insider/0001350876","role":"Director","role_mark":"D","role_mark_label":"Director","role_mark_generic":"Director","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":null,"security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":37337.0,"shares_display":"37,337","price_per_share":22.72,"price_display":"22.72","price_state":"stated","total_value":848296.64,"total_display":"848,296.64","total_whole":"848,297","shares_owned_after":88473.0,"shares_owned_after_display":"88,473","ownership_form":"D","is_10b5_1":null,"transaction_date":"2026-08-06","filed_date":"2026-08-07","scope":"insider"},{"id":5798198,"accession":"0001193125-26-274508","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001193125-26-274508","line_url":"/filing/0001193125-26-274508#line-1","is_derivative":false,"issuer_cik":"0001350876","issuer_name":"MAGNITE, INC.","issuer_ticker":"MGNI","issuer_name_source":null,"issuer_url":"/issuer/0001350876","owner_cik":"0001350876","owner_name":"Knopper Douglas S","owner_display_name":"Knopper Douglas S","owner_url":"/insider/0001350876","role":"Director","role_mark":"D","role_mark_label":"Director","role_mark_generic":"Director","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":null,"security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":37337.0,"shares_display":"37,337","price_per_share":18.1,"price_display":"18.10","price_state":"stated","total_value":675799.7,"total_display":"675,799.70","total_whole":"675,800","shares_owned_after":125810.0,"shares_owned_after_display":"125,810","ownership_form":"D","is_10b5_1":null,"transaction_date":"2026-06-16","filed_date":"2026-06-17","scope":"insider"},{"id":6154187,"accession":"0001193125-26-266370","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001193125-26-266370","line_url":"/filing/0001193125-26-266370#line-2","is_derivative":false,"issuer_cik":"0001350876","issuer_name":"MAGNITE, INC.","issuer_ticker":"MGNI","issuer_name_source":null,"issuer_url":"/issuer/0001350876","owner_cik":"0001350876","owner_name":"Knopper Douglas S","owner_display_name":"Knopper Douglas S","owner_url":"/insider/0001350876","role":"Director","role_mark":"D","role_mark_label":"Director","role_mark_generic":"Director","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":null,"security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":10766.0,"shares_display":"10,766","price_per_share":15.73,"price_display":"15.73","price_state":"stated","total_value":169349.18,"total_display":"169,349.18","total_whole":"169,349","shares_owned_after":163147.0,"shares_owned_after_display":"163,147","ownership_form":"D","is_10b5_1":null,"transaction_date":"2026-06-10","filed_date":"2026-06-10","scope":"insider"},{"id":5334985,"accession":"0001209191-21-046563","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001209191-21-046563","line_url":"/filing/0001209191-21-046563","is_derivative":false,"issuer_cik":"0001350876","issuer_name":"MAGNITE, INC.","issuer_ticker":"MGNI","issuer_name_source":null,"issuer_url":"/issuer/0001350876","owner_cik":"0001350876","owner_name":"Knopper Douglas S","owner_display_name":"Knopper Douglas S","owner_url":"/insider/0001350876","role":"Director","role_mark":"D","role_mark_label":"Director","role_mark_generic":"Director","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":null,"security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":10200.0,"shares_display":"10,200","price_per_share":32.7885,"price_display":"32.79","price_state":"stated","total_value":334442.7,"total_display":"334,442.70","total_whole":"334,443","shares_owned_after":106246.0,"shares_owned_after_display":"106,246","ownership_form":"D","is_10b5_1":null,"transaction_date":"2021-07-09","filed_date":"2021-07-13","scope":"insider","n_lines":2},{"id":5424353,"accession":"0001209191-21-025968","txn_seq":4,"anchor":"line-4","filing_url":"/filing/0001209191-21-025968","line_url":"/filing/0001209191-21-025968","is_derivative":false,"issuer_cik":"0001350876","issuer_name":"MAGNITE, INC.","issuer_ticker":"MGNI","issuer_name_source":null,"issuer_url":"/issuer/0001350876","owner_cik":"0001350876","owner_name":"Knopper Douglas S","owner_display_name":"Knopper Douglas S","owner_url":"/insider/0001350876","role":"Director","role_mark":"D","role_mark_label":"Director","role_mark_generic":"Director","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":null,"security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":10000.0,"shares_display":"10,000","price_per_share":40.076629,"price_display":"40.08","price_state":"stated","total_value":400766.29,"total_display":"400,766.29","total_whole":"400,766","shares_owned_after":116397.0,"shares_owned_after_display":"116,397","ownership_form":"D","is_10b5_1":null,"transaction_date":"2021-04-05","filed_date":"2021-04-07","scope":"insider","n_lines":4}],"collapsed":true,"next_cursor":null,"ledger_fault":false,"count":{"value":9,"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":9,"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":9},"affiliations":[{"type":"issuer","type_label":"ISSUER","cik":"0001595974","name":"MAGNITE, INC.","url":"/issuer/0001595974","role":"Director","n_filings":5,"first_seen":"2021-04-07","last_seen":"2026-08-07"}],"order_statement":"Newest transaction date first, id breaking the tie.","canonical_url":"https://ebomi.com/insider/0001350876","retrieved_at":"2026-08-27T10:35:18+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"}}