{"schema_version":"secwatch.filing_event.v1","accession":"0001537435-23-000116","form_type":"8-K","ticker":"TGEN","cik":"0001537435","company_name":"TECOGEN INC.","filed_at":"2023-09-26T23:59:59+00:00","discovered_at":"2026-05-14T18:03:34.239510+00:00","generated_at":"2026-06-10T08:39:58.087878+00:00","sec_items":["5.02","9.01"],"event_type":"leadership","sentiment":"neutral","materiality_score":0.35,"calibrated_materiality_score":0.35,"confidence":"high","headline":"Tecogen appoints Susan Hirsch to board; receives option for 100,000 shares","bullets":["Appointed Susan B. Hirsch as independent non-employee director to fill a board vacancy.","Hirsch has over 40 years of investment management experience; formerly MD at Nuveen managing $20B+ in assets.","Received a non-qualified stock option to purchase 100,000 shares under the 2022 Stock Incentive Plan.","Hirsch and spouse jointly hold 245,416 shares of Tecogen common stock.","Also serves on the board of Agenus Inc. and as Trustee for the Baruch College Fund."],"urls":{"canonical":"https://secwatch.observer/filing/0001537435-23-000116","json":"https://secwatch.observer/filing/0001537435-23-000116.json","markdown":"https://secwatch.observer/filing/0001537435-23-000116.md","text":"https://secwatch.observer/filing/0001537435-23-000116.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/1537435/000153743523000116/0001537435-23-000116-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/1537435/000153743523000116/tgen-20230922.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-10T08:39:58.087878+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[{"claim_id":"fdc0677ba3","claim":"Susan B. Hirsch was appointed as independent non-employee director at TECOGEN INC..","evidence_excerpt":"On September 22, 2023, the Board of Directors of Tecogen Inc. (“registrant”) appointed Ms. Susan B. Hirsch to serve as an independent non-employee director of registrant to fill a vacancy in registrant’s board of directors.","evidence_source":"SEC 8-K Item 5.02","evidence_url":"https://www.sec.gov/Archives/edgar/data/1537435/000153743523000116/0001537435-23-000116-index.htm","confidence":0.95,"family_label":"Executive change","details":[{"label":"Action","value":"appointed"},{"label":"Role","value":"independent non-employee director"}],"fact_type":"executive_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}