{"entity":{"type":"insider","cik":"0002077951","url":"/insider/0002077951","json_url":"/insider/0002077951.json","name":"Nelson Jonathan Michael","name_source":"as-filed","also_issuer":false,"cross_url":null},"coverage_statement":{"n_transactions":9,"n_filings":8,"first":"2025-08-05","last":"2026-06-03","span_basis":"filed_date"},"name_variants":[{"name":"Nelson Jonathan Michael","source":"filing","n_filings":8,"first_seen":"2025-08-05","last_seen":"2026-06-03"}],"transactions":[{"id":6147815,"accession":"0001437749-26-019346","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001437749-26-019346","line_url":"/filing/0001437749-26-019346#line-1","is_derivative":false,"issuer_cik":"0002058758","issuer_name":"Avidia Bancorp, Inc.","issuer_ticker":"AVBC","issuer_name_source":null,"issuer_url":"/issuer/0002058758","owner_cik":"0002077951","owner_name":"Nelson Jonathan Michael","owner_display_name":"Nelson Jonathan Michael","owner_url":"/insider/0002077951","role":"Officer (CFO and Treasurer)","role_mark":"O","role_mark_label":"Officer (CFO and Treasurer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"CFO and Treasurer","security_title":"Common Stock","transaction_code":"P","transaction_label":"Open-market purchase","open_market":true,"acquired_disposed":"A","direction_word":"acquired","shares":1065.0,"shares_display":"1,065","price_per_share":18.8999,"price_display":"18.90","price_state":"stated","total_value":20128.3935,"total_display":"20,128.39","total_whole":"20,128","shares_owned_after":14545.0,"shares_owned_after_display":"14,545","ownership_form":"D","is_10b5_1":null,"transaction_date":"2026-06-03","filed_date":"2026-06-03","scope":"insider"},{"id":5765247,"accession":"0001437749-26-007470","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001437749-26-007470","line_url":"/filing/0001437749-26-007470#line-1","is_derivative":false,"issuer_cik":"0002058758","issuer_name":"Avidia Bancorp, Inc.","issuer_ticker":"AVBC","issuer_name_source":null,"issuer_url":"/issuer/0002058758","owner_cik":"0002077951","owner_name":"Nelson Jonathan Michael","owner_display_name":"Nelson Jonathan Michael","owner_url":"/insider/0002077951","role":"Officer (CFO and Treasurer)","role_mark":"O","role_mark_label":"Officer (CFO and Treasurer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"CFO and Treasurer","security_title":"Common Stock","transaction_code":"P","transaction_label":"Open-market purchase","open_market":true,"acquired_disposed":"A","direction_word":"acquired","shares":2579.0,"shares_display":"2,579","price_per_share":19.3891,"price_display":"19.39","price_state":"stated","total_value":50004.4889,"total_display":"50,004.49","total_whole":"50,004","shares_owned_after":22378.0,"shares_owned_after_display":"22,378","ownership_form":"I","is_10b5_1":null,"transaction_date":"2026-03-09","filed_date":"2026-03-10","scope":"insider"},{"id":4362686,"accession":"0001437749-25-036217","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001437749-25-036217","line_url":"/filing/0001437749-25-036217#line-1","is_derivative":false,"issuer_cik":"0002058758","issuer_name":"Avidia Bancorp, Inc.","issuer_ticker":"AVBC","issuer_name_source":null,"issuer_url":"/issuer/0002058758","owner_cik":"0002077951","owner_name":"Nelson Jonathan Michael","owner_display_name":"Nelson Jonathan Michael","owner_url":"/insider/0002077951","role":"Officer (CFO and Treasurer)","role_mark":"O","role_mark_label":"Officer (CFO and Treasurer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"CFO and Treasurer","security_title":"Common Stock","transaction_code":"P","transaction_label":"Open-market purchase","open_market":true,"acquired_disposed":"A","direction_word":"acquired","shares":3245.0,"shares_display":"3,245","price_per_share":15.41,"price_display":"15.41","price_state":"stated","total_value":50005.45,"total_display":"50,005.45","total_whole":"50,005","shares_owned_after":19799.0,"shares_owned_after_display":"19,799","ownership_form":"I","is_10b5_1":null,"transaction_date":"2025-11-24","filed_date":"2025-11-25","scope":"insider"},{"id":5195622,"accession":"0001437749-25-028239","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001437749-25-028239","line_url":"/filing/0001437749-25-028239#line-1","is_derivative":false,"issuer_cik":"0002058758","issuer_name":"Avidia Bancorp, Inc.","issuer_ticker":"AVBC","issuer_name_source":null,"issuer_url":"/issuer/0002058758","owner_cik":"0002077951","owner_name":"Nelson Jonathan Michael","owner_display_name":"Nelson Jonathan Michael","owner_url":"/insider/0002077951","role":"Officer (CFO and Treasurer)","role_mark":"O","role_mark_label":"Officer (CFO and Treasurer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"CFO and Treasurer","security_title":"Common Stock","transaction_code":"P","transaction_label":"Open-market purchase","open_market":true,"acquired_disposed":"A","direction_word":"acquired","shares":3240.0,"shares_display":"3,240","price_per_share":15.45,"price_display":"15.45","price_state":"stated","total_value":50058.0,"total_display":"50,058.00","total_whole":"50,058","shares_owned_after":13480.0,"shares_owned_after_display":"13,480","ownership_form":"D","is_10b5_1":null,"transaction_date":"2025-09-03","filed_date":"2025-09-03","scope":"insider"},{"id":5195615,"accession":"0001437749-25-027926","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001437749-25-027926","line_url":"/filing/0001437749-25-027926","is_derivative":false,"issuer_cik":"0002058758","issuer_name":"Avidia Bancorp, Inc.","issuer_ticker":"AVBC","issuer_name_source":null,"issuer_url":"/issuer/0002058758","owner_cik":"0002077951","owner_name":"Nelson Jonathan Michael","owner_display_name":"Nelson Jonathan Michael","owner_url":"/insider/0002077951","role":"Officer (CFO and Treasurer)","role_mark":"O","role_mark_label":"Officer (CFO and Treasurer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"CFO and Treasurer","security_title":"Common Stock","transaction_code":"P","transaction_label":"Open-market purchase","open_market":true,"acquired_disposed":"A","direction_word":"acquired","shares":3240.0,"shares_display":"3,240","price_per_share":15.469984567901234,"price_display":"15.47","price_state":"stated","total_value":50122.75,"total_display":"50,122.75","total_whole":"50,123","shares_owned_after":10240.0,"shares_owned_after_display":"10,240","ownership_form":"D","is_10b5_1":null,"transaction_date":"2025-08-28","filed_date":"2025-08-28","scope":"insider","n_lines":2},{"id":5047771,"accession":"0001437749-25-027809","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001437749-25-027809","line_url":"/filing/0001437749-25-027809#line-1","is_derivative":false,"issuer_cik":"0002058758","issuer_name":"Avidia Bancorp, Inc.","issuer_ticker":"AVBC","issuer_name_source":null,"issuer_url":"/issuer/0002058758","owner_cik":"0002077951","owner_name":"Nelson Jonathan Michael","owner_display_name":"Nelson Jonathan Michael","owner_url":"/insider/0002077951","role":"Officer (CFO and Treasurer)","role_mark":"O","role_mark_label":"Officer (CFO and Treasurer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"CFO and Treasurer","security_title":"Common Stock","transaction_code":"P","transaction_label":"Open-market purchase","open_market":true,"acquired_disposed":"A","direction_word":"acquired","shares":6631.0,"shares_display":"6,631","price_per_share":15.0806,"price_display":"15.08","price_state":"stated","total_value":99999.4586,"total_display":"99,999.46","total_whole":"99,999","shares_owned_after":16554.0,"shares_owned_after_display":"16,554","ownership_form":"I","is_10b5_1":null,"transaction_date":"2025-08-26","filed_date":"2025-08-27","scope":"insider"},{"id":4468365,"accession":"0001437749-25-025929","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001437749-25-025929","line_url":"/filing/0001437749-25-025929#line-1","is_derivative":false,"issuer_cik":"0002058758","issuer_name":"Avidia Bancorp, Inc.","issuer_ticker":"AVBC","issuer_name_source":null,"issuer_url":"/issuer/0002058758","owner_cik":"0002077951","owner_name":"Nelson Jonathan Michael","owner_display_name":"Nelson Jonathan Michael","owner_url":"/insider/0002077951","role":"Officer (CFO and Treasurer)","role_mark":"O","role_mark_label":"Officer (CFO and Treasurer)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"CFO and Treasurer","security_title":"Common Stock","transaction_code":"P","transaction_label":"Open-market purchase","open_market":true,"acquired_disposed":"A","direction_word":"acquired","shares":9923.0,"shares_display":"9,923","price_per_share":14.4472,"price_display":"14.45","price_state":"stated","total_value":143359.5656,"total_display":"143,359.57","total_whole":"143,360","shares_owned_after":9923.0,"shares_owned_after_display":"9,923","ownership_form":"I","is_10b5_1":null,"transaction_date":"2025-08-08","filed_date":"2025-08-11","scope":"insider"},{"id":4565425,"accession":"0001437749-25-024794","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001437749-25-024794","line_url":"/filing/0001437749-25-024794#line-1","is_derivative":false,"issuer_cik":"0002058758","issuer_name":"Avidia Bancorp, Inc.","issuer_ticker":"AVBC","issuer_name_source":null,"issuer_url":"/issuer/0002058758","owner_cik":"0002077951","owner_name":"Nelson Jonathan Michael","owner_display_name":"Nelson Jonathan Michael","owner_url":"/insider/0002077951","role":"Officer (EVP and CFO)","role_mark":"O","role_mark_label":"Officer (EVP and CFO)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"EVP and CFO","security_title":"Common Stock","transaction_code":"P","transaction_label":"Open-market purchase","open_market":true,"acquired_disposed":"A","direction_word":"acquired","shares":7000.0,"shares_display":"7,000","price_per_share":14.3969,"price_display":"14.40","price_state":"stated","total_value":100778.3,"total_display":"100,778.30","total_whole":"100,778","shares_owned_after":7000.0,"shares_owned_after_display":"7,000","ownership_form":"D","is_10b5_1":null,"transaction_date":"2025-08-05","filed_date":"2025-08-05","scope":"insider"}],"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":9,"open_market":true},{"code":"S","label":"Open-market sale","n":0,"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":"0002058758","name":"Avidia Bancorp, Inc.","url":"/issuer/0002058758","role":"Officer (CFO and Treasurer)","n_filings":8,"first_seen":"2025-08-05","last_seen":"2026-06-03"}],"order_statement":"Newest transaction date first, id breaking the tie.","canonical_url":"https://ebomi.com/insider/0002077951","retrieved_at":"2026-08-24T03:15:08+00:00","coverage":{"filings":1506293,"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"}}