{"entity":{"type":"insider","cik":"0001340731","url":"/insider/0001340731","json_url":"/insider/0001340731.json","name":"Hazlett James R","name_source":"as-filed","also_issuer":false,"cross_url":null},"coverage_statement":{"n_transactions":81,"n_filings":31,"first":"2006-03-29","last":"2022-06-08","span_basis":"filed_date"},"name_variants":[{"name":"Hazlett James R","source":"filing","n_filings":31,"first_seen":"2006-03-29","last_seen":"2022-06-08"}],"transactions":[{"id":6146621,"accession":"0001084991-22-000065","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001084991-22-000065","line_url":"/filing/0001084991-22-000065#line-1","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP - Technical Services)","role_mark":"O","role_mark_label":"Officer (VP - Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP - Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":972.0,"shares_display":"972","price_per_share":15.0,"price_display":"15.00","price_state":"stated","total_value":14580.0,"total_display":"14,580.00","total_whole":"14,580","shares_owned_after":72046.0,"shares_owned_after_display":"72,046","ownership_form":"D","is_10b5_1":null,"transaction_date":"2022-06-07","filed_date":"2022-06-08","scope":"insider"},{"id":6300217,"accession":"0001084991-22-000058","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001084991-22-000058","line_url":"/filing/0001084991-22-000058#line-2","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP - Technical Services)","role_mark":"O","role_mark_label":"Officer (VP - Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP - Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":2405.0,"shares_display":"2,405","price_per_share":14.01,"price_display":"14.01","price_state":"stated","total_value":33694.05,"total_display":"33,694.05","total_whole":"33,694","shares_owned_after":73018.0,"shares_owned_after_display":"73,018","ownership_form":"D","is_10b5_1":null,"transaction_date":"2022-05-31","filed_date":"2022-06-01","scope":"insider"},{"id":6300214,"accession":"0001084991-22-000058","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001084991-22-000058","line_url":"/filing/0001084991-22-000058#line-1","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP - Technical Services)","role_mark":"O","role_mark_label":"Officer (VP - Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP - Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":595.0,"shares_display":"595","price_per_share":14.05,"price_display":"14.05","price_state":"stated","total_value":8359.75,"total_display":"8,359.75","total_whole":"8,360","shares_owned_after":75423.0,"shares_owned_after_display":"75,423","ownership_form":"D","is_10b5_1":null,"transaction_date":"2022-05-27","filed_date":"2022-06-01","scope":"insider"},{"id":6984808,"accession":"0001084991-22-000002","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001084991-22-000002","line_url":"/filing/0001084991-22-000002#line-2","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP - Technical Services)","role_mark":"O","role_mark_label":"Officer (VP - Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP - Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":300.0,"shares_display":"300","price_per_share":14.0,"price_display":"14.00","price_state":"stated","total_value":4200.0,"total_display":"4,200.00","total_whole":"4,200","shares_owned_after":81035.0,"shares_owned_after_display":"81,035","ownership_form":"D","is_10b5_1":null,"transaction_date":"2022-03-02","filed_date":"2022-03-03","scope":"insider"},{"id":6984798,"accession":"0001084991-22-000002","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001084991-22-000002","line_url":"/filing/0001084991-22-000002#line-1","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP - Technical Services)","role_mark":"O","role_mark_label":"Officer (VP - Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP - Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":2750.0,"shares_display":"2,750","price_per_share":13.13,"price_display":"13.13","price_state":"stated","total_value":36107.5,"total_display":"36,107.50","total_whole":"36,108","shares_owned_after":81335.0,"shares_owned_after_display":"81,335","ownership_form":"D","is_10b5_1":null,"transaction_date":"2022-03-01","filed_date":"2022-03-03","scope":"insider"},{"id":5049776,"accession":"0001084991-21-000085","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001084991-21-000085","line_url":"/filing/0001084991-21-000085#line-1","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP - Technical Services)","role_mark":"O","role_mark_label":"Officer (VP - Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP - Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":2750.0,"shares_display":"2,750","price_per_share":12.08,"price_display":"12.08","price_state":"stated","total_value":33220.0,"total_display":"33,220.00","total_whole":"33,220","shares_owned_after":84085.0,"shares_owned_after_display":"84,085","ownership_form":"D","is_10b5_1":null,"transaction_date":"2021-10-06","filed_date":"2021-10-07","scope":"insider"},{"id":2070547,"accession":"0001084991-20-000086","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001084991-20-000086","line_url":"/filing/0001084991-20-000086#line-1","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP -- Technical Services)","role_mark":"O","role_mark_label":"Officer (VP -- Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP -- Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":2500.0,"shares_display":"2,500","price_per_share":12.0,"price_display":"12.00","price_state":"stated","total_value":30000.0,"total_display":"30,000.00","total_whole":"30,000","shares_owned_after":71147.0,"shares_owned_after_display":"71,147","ownership_form":"D","is_10b5_1":null,"transaction_date":"2020-12-10","filed_date":"2020-12-10","scope":"insider"},{"id":8115821,"accession":"0001084991-19-000028","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001084991-19-000028","line_url":"/filing/0001084991-19-000028#line-2","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP -- Technical Services)","role_mark":"O","role_mark_label":"Officer (VP -- Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP -- Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1413.0,"shares_display":"1,413","price_per_share":17.77,"price_display":"17.77","price_state":"stated","total_value":25109.01,"total_display":"25,109.01","total_whole":"25,109","shares_owned_after":47582.0,"shares_owned_after_display":"47,582","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-04-23","filed_date":"2019-04-25","scope":"insider"},{"id":8115820,"accession":"0001084991-19-000028","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001084991-19-000028","line_url":"/filing/0001084991-19-000028#line-1","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP -- Technical Services)","role_mark":"O","role_mark_label":"Officer (VP -- Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP -- Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1687.0,"shares_display":"1,687","price_per_share":17.79,"price_display":"17.79","price_state":"stated","total_value":30011.73,"total_display":"30,011.73","total_whole":"30,012","shares_owned_after":48995.0,"shares_owned_after_display":"48,995","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-04-22","filed_date":"2019-04-25","scope":"insider"},{"id":8145369,"accession":"0001084991-19-000019","txn_seq":3,"anchor":"line-3","filing_url":"/filing/0001084991-19-000019","line_url":"/filing/0001084991-19-000019#line-3","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP -- Technical Services)","role_mark":"O","role_mark_label":"Officer (VP -- Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP -- Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1000.0,"shares_display":"1,000","price_per_share":17.57,"price_display":"17.57","price_state":"stated","total_value":17570.0,"total_display":"17,570.00","total_whole":"17,570","shares_owned_after":50682.0,"shares_owned_after_display":"50,682","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-04-01","filed_date":"2019-04-01","scope":"insider"},{"id":8145364,"accession":"0001084991-19-000019","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001084991-19-000019","line_url":"/filing/0001084991-19-000019#line-2","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP -- Technical Services)","role_mark":"O","role_mark_label":"Officer (VP -- Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP -- Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1000.0,"shares_display":"1,000","price_per_share":17.07,"price_display":"17.07","price_state":"stated","total_value":17070.0,"total_display":"17,070.00","total_whole":"17,070","shares_owned_after":51682.0,"shares_owned_after_display":"51,682","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-03-29","filed_date":"2019-04-01","scope":"insider"},{"id":8145360,"accession":"0001084991-19-000019","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001084991-19-000019","line_url":"/filing/0001084991-19-000019#line-1","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP -- Technical Services)","role_mark":"O","role_mark_label":"Officer (VP -- Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP -- Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1000.0,"shares_display":"1,000","price_per_share":17.14,"price_display":"17.14","price_state":"stated","total_value":17140.0,"total_display":"17,140.00","total_whole":"17,140","shares_owned_after":52682.0,"shares_owned_after_display":"52,682","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-03-28","filed_date":"2019-04-01","scope":"insider"},{"id":8026219,"accession":"0001084991-19-000017","txn_seq":4,"anchor":"line-4","filing_url":"/filing/0001084991-19-000017","line_url":"/filing/0001084991-19-000017#line-4","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP -- Technical Services)","role_mark":"O","role_mark_label":"Officer (VP -- Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP -- Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1000.0,"shares_display":"1,000","price_per_share":17.33,"price_display":"17.33","price_state":"stated","total_value":17330.0,"total_display":"17,330.00","total_whole":"17,330","shares_owned_after":53682.0,"shares_owned_after_display":"53,682","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-03-27","filed_date":"2019-03-27","scope":"insider"},{"id":8026217,"accession":"0001084991-19-000017","txn_seq":3,"anchor":"line-3","filing_url":"/filing/0001084991-19-000017","line_url":"/filing/0001084991-19-000017#line-3","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP -- Technical Services)","role_mark":"O","role_mark_label":"Officer (VP -- Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP -- Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1000.0,"shares_display":"1,000","price_per_share":17.26,"price_display":"17.26","price_state":"stated","total_value":17260.0,"total_display":"17,260.00","total_whole":"17,260","shares_owned_after":54682.0,"shares_owned_after_display":"54,682","ownership_form":"D","is_10b5_1":null,"transaction_date":"2019-03-26","filed_date":"2019-03-27","scope":"insider"},{"id":6288525,"accession":"0001084991-18-000006","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001084991-18-000006","line_url":"/filing/0001084991-18-000006#line-2","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP -- Technical Services)","role_mark":"O","role_mark_label":"Officer (VP -- Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP -- Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":102.0,"shares_display":"102","price_per_share":28.9,"price_display":"28.90","price_state":"stated","total_value":2947.8,"total_display":"2,947.80","total_whole":"2,948","shares_owned_after":45282.0,"shares_owned_after_display":"45,282","ownership_form":"D","is_10b5_1":null,"transaction_date":"2018-01-25","filed_date":"2018-01-29","scope":"insider"},{"id":6384060,"accession":"0001084991-18-000003","txn_seq":7,"anchor":"line-7","filing_url":"/filing/0001084991-18-000003","line_url":"/filing/0001084991-18-000003#line-7","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP -- Technical Services)","role_mark":"O","role_mark_label":"Officer (VP -- Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP -- Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":200.0,"shares_display":"200","price_per_share":28.9,"price_display":"28.90","price_state":"stated","total_value":5780.0,"total_display":"5,780.00","total_whole":"5,780","shares_owned_after":44430.0,"shares_owned_after_display":"44,430","ownership_form":"D","is_10b5_1":null,"transaction_date":"2018-01-24","filed_date":"2018-01-24","scope":"insider"},{"id":6384055,"accession":"0001084991-18-000003","txn_seq":5,"anchor":"line-5","filing_url":"/filing/0001084991-18-000003","line_url":"/filing/0001084991-18-000003","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP -- Technical Services)","role_mark":"O","role_mark_label":"Officer (VP -- Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP -- Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1492.0,"shares_display":"1,492","price_per_share":28.967191689008043,"price_display":"28.97","price_state":"stated","total_value":43219.05,"total_display":"43,219.05","total_whole":"43,219","shares_owned_after":44943.0,"shares_owned_after_display":"44,943","ownership_form":"D","is_10b5_1":null,"transaction_date":"2018-01-23","filed_date":"2018-01-24","scope":"insider","n_lines":2},{"id":6384049,"accession":"0001084991-18-000003","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001084991-18-000003","line_url":"/filing/0001084991-18-000003#line-2","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP -- Technical Services)","role_mark":"O","role_mark_label":"Officer (VP -- Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP -- Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":198.0,"shares_display":"198","price_per_share":28.9,"price_display":"28.90","price_state":"stated","total_value":5722.2,"total_display":"5,722.20","total_whole":"5,722","shares_owned_after":44943.0,"shares_owned_after_display":"44,943","ownership_form":"D","is_10b5_1":null,"transaction_date":"2018-01-22","filed_date":"2018-01-24","scope":"insider"},{"id":9220562,"accession":"0001084991-18-000004","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001084991-18-000004","line_url":"/filing/0001084991-18-000004#line-1","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP -- Technical Services)","role_mark":"O","role_mark_label":"Officer (VP -- Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP -- Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1349.0,"shares_display":"1,349","price_per_share":29.01,"price_display":"29.01","price_state":"stated","total_value":39134.49,"total_display":"39,134.49","total_whole":"39,134","shares_owned_after":45282.0,"shares_owned_after_display":"45,282","ownership_form":"D","is_10b5_1":null,"transaction_date":"2018-01-17","filed_date":"2018-01-26","scope":"insider"},{"id":6092449,"accession":"0001084991-18-000002","txn_seq":8,"anchor":"line-8","filing_url":"/filing/0001084991-18-000002","line_url":"/filing/0001084991-18-000002","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP -- Technical Services)","role_mark":"O","role_mark_label":"Officer (VP -- Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP -- Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":3693.0,"shares_display":"3,693","price_per_share":28.982854048199297,"price_display":"28.98","price_state":"stated","total_value":107033.68,"total_display":"107,033.68","total_whole":"107,034","shares_owned_after":44943.0,"shares_owned_after_display":"44,943","ownership_form":"D","is_10b5_1":null,"transaction_date":"2018-01-17","filed_date":"2018-01-17","scope":"insider","n_lines":2},{"id":6092439,"accession":"0001084991-18-000002","txn_seq":5,"anchor":"line-5","filing_url":"/filing/0001084991-18-000002","line_url":"/filing/0001084991-18-000002","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP -- Technical Services)","role_mark":"O","role_mark_label":"Officer (VP -- Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP -- Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":2440.0,"shares_display":"2,440","price_per_share":28.984454918032785,"price_display":"28.98","price_state":"stated","total_value":70722.07,"total_display":"70,722.07","total_whole":"70,722","shares_owned_after":47832.0,"shares_owned_after_display":"47,832","ownership_form":"D","is_10b5_1":null,"transaction_date":"2018-01-16","filed_date":"2018-01-17","scope":"insider","n_lines":2},{"id":6092430,"accession":"0001084991-18-000002","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001084991-18-000002","line_url":"/filing/0001084991-18-000002#line-2","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP -- Technical Services)","role_mark":"O","role_mark_label":"Officer (VP -- Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP -- Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":277.0,"shares_display":"277","price_per_share":28.92,"price_display":"28.92","price_state":"stated","total_value":8010.84,"total_display":"8,010.84","total_whole":"8,011","shares_owned_after":47832.0,"shares_owned_after_display":"47,832","ownership_form":"D","is_10b5_1":null,"transaction_date":"2018-01-12","filed_date":"2018-01-17","scope":"insider"},{"id":5054986,"accession":"0001084991-17-000059","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001084991-17-000059","line_url":"/filing/0001084991-17-000059#line-2","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP -- Technical Services)","role_mark":"O","role_mark_label":"Officer (VP -- Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP -- Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":2543.0,"shares_display":"2,543","price_per_share":28.04,"price_display":"28.04","price_state":"stated","total_value":71305.72,"total_display":"71,305.72","total_whole":"71,306","shares_owned_after":47832.0,"shares_owned_after_display":"47,832","ownership_form":"D","is_10b5_1":null,"transaction_date":"2017-09-27","filed_date":"2017-09-28","scope":"insider"},{"id":5054980,"accession":"0001084991-17-000059","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001084991-17-000059","line_url":"/filing/0001084991-17-000059#line-1","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP -- Technical Services)","role_mark":"O","role_mark_label":"Officer (VP -- Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP -- Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":9807.0,"shares_display":"9,807","price_per_share":28.01,"price_display":"28.01","price_state":"stated","total_value":274694.07,"total_display":"274,694.07","total_whole":"274,694","shares_owned_after":50375.0,"shares_owned_after_display":"50,375","ownership_form":"D","is_10b5_1":null,"transaction_date":"2017-09-26","filed_date":"2017-09-28","scope":"insider"},{"id":4929925,"accession":"0001084991-17-000038","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001084991-17-000038","line_url":"/filing/0001084991-17-000038#line-1","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP - Technical Services)","role_mark":"O","role_mark_label":"Officer (VP - Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP - Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":400.0,"shares_display":"400","price_per_share":28.01,"price_display":"28.01","price_state":"stated","total_value":11204.0,"total_display":"11,204.00","total_whole":"11,204","shares_owned_after":60182.0,"shares_owned_after_display":"60,182","ownership_form":"D","is_10b5_1":null,"transaction_date":"2017-05-02","filed_date":"2017-05-04","scope":"insider"},{"id":5013747,"accession":"0001084991-17-000029","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001084991-17-000029","line_url":"/filing/0001084991-17-000029#line-2","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP -- Technical Services)","role_mark":"O","role_mark_label":"Officer (VP -- Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP -- Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":2550.0,"shares_display":"2,550","price_per_share":28.52,"price_display":"28.52","price_state":"stated","total_value":72726.0,"total_display":"72,726.00","total_whole":"72,726","shares_owned_after":63340.0,"shares_owned_after_display":"63,340","ownership_form":"D","is_10b5_1":null,"transaction_date":"2017-04-11","filed_date":"2017-04-12","scope":"insider"},{"id":2450521,"accession":"0001084991-16-000088","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001084991-16-000088","line_url":"/filing/0001084991-16-000088#line-1","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP - Technical Services)","role_mark":"O","role_mark_label":"Officer (VP - Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP - Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":3333.0,"shares_display":"3,333","price_per_share":28.67,"price_display":"28.67","price_state":"stated","total_value":95557.11,"total_display":"95,557.11","total_whole":"95,557","shares_owned_after":60890.0,"shares_owned_after_display":"60,890","ownership_form":"D","is_10b5_1":null,"transaction_date":"2016-11-22","filed_date":"2016-11-23","scope":"insider"},{"id":3356400,"accession":"0001084991-16-000075","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001084991-16-000075","line_url":"/filing/0001084991-16-000075#line-1","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP -- Technical Services)","role_mark":"O","role_mark_label":"Officer (VP -- Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP -- Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":3500.0,"shares_display":"3,500","price_per_share":23.92,"price_display":"23.92","price_state":"stated","total_value":83720.0,"total_display":"83,720.00","total_whole":"83,720","shares_owned_after":64223.0,"shares_owned_after_display":"64,223","ownership_form":"D","is_10b5_1":null,"transaction_date":"2016-06-23","filed_date":"2016-06-24","scope":"insider"},{"id":8934707,"accession":"0000899243-15-010226","txn_seq":3,"anchor":"line-3","filing_url":"/filing/0000899243-15-010226","line_url":"/filing/0000899243-15-010226#line-3","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (Vice President-Technical Svcs)","role_mark":"O","role_mark_label":"Officer (Vice President-Technical Svcs)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Vice President-Technical Svcs.","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1500.0,"shares_display":"1,500","price_per_share":20.87,"price_display":"20.87","price_state":"stated","total_value":31305.0,"total_display":"31,305.00","total_whole":"31,305","shares_owned_after":53356.0,"shares_owned_after_display":"53,356","ownership_form":"D","is_10b5_1":null,"transaction_date":"2015-12-21","filed_date":"2015-12-21","scope":"insider"},{"id":8934705,"accession":"0000899243-15-010226","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0000899243-15-010226","line_url":"/filing/0000899243-15-010226#line-2","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (Vice President-Technical Svcs)","role_mark":"O","role_mark_label":"Officer (Vice President-Technical Svcs)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Vice President-Technical Svcs.","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":2000.0,"shares_display":"2,000","price_per_share":20.31,"price_display":"20.31","price_state":"stated","total_value":40620.0,"total_display":"40,620.00","total_whole":"40,620","shares_owned_after":54856.0,"shares_owned_after_display":"54,856","ownership_form":"D","is_10b5_1":null,"transaction_date":"2015-12-18","filed_date":"2015-12-21","scope":"insider"},{"id":8934704,"accession":"0000899243-15-010226","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0000899243-15-010226","line_url":"/filing/0000899243-15-010226#line-1","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (Vice President-Technical Svcs)","role_mark":"O","role_mark_label":"Officer (Vice President-Technical Svcs)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Vice President-Technical Svcs.","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1000.0,"shares_display":"1,000","price_per_share":20.03,"price_display":"20.03","price_state":"stated","total_value":20030.0,"total_display":"20,030.00","total_whole":"20,030","shares_owned_after":56856.0,"shares_owned_after_display":"56,856","ownership_form":"D","is_10b5_1":null,"transaction_date":"2015-12-17","filed_date":"2015-12-21","scope":"insider"},{"id":8856073,"accession":"0000899243-15-010058","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0000899243-15-010058","line_url":"/filing/0000899243-15-010058#line-2","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (Vice President-Technical Svcs)","role_mark":"O","role_mark_label":"Officer (Vice President-Technical Svcs)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Vice President-Technical Svcs.","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1000.0,"shares_display":"1,000","price_per_share":19.81,"price_display":"19.81","price_state":"stated","total_value":19810.0,"total_display":"19,810.00","total_whole":"19,810","shares_owned_after":61922.0,"shares_owned_after_display":"61,922","ownership_form":"D","is_10b5_1":null,"transaction_date":"2015-12-16","filed_date":"2015-12-17","scope":"insider"},{"id":8856071,"accession":"0000899243-15-010058","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0000899243-15-010058","line_url":"/filing/0000899243-15-010058#line-1","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (Vice President-Technical Svcs)","role_mark":"O","role_mark_label":"Officer (Vice President-Technical Svcs)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Vice President-Technical Svcs.","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1000.0,"shares_display":"1,000","price_per_share":20.01,"price_display":"20.01","price_state":"stated","total_value":20010.0,"total_display":"20,010.00","total_whole":"20,010","shares_owned_after":62922.0,"shares_owned_after_display":"62,922","ownership_form":"D","is_10b5_1":null,"transaction_date":"2015-12-15","filed_date":"2015-12-17","scope":"insider"},{"id":8436886,"accession":"0000899243-15-000045","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0000899243-15-000045","line_url":"/filing/0000899243-15-000045#line-1","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (Vice President-Technical Svcs)","role_mark":"O","role_mark_label":"Officer (Vice President-Technical Svcs)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Vice President-Technical Svcs.","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":2500.0,"shares_display":"2,500","price_per_share":22.0,"price_display":"22.00","price_state":"stated","total_value":55000.0,"total_display":"55,000.00","total_whole":"55,000","shares_owned_after":63922.0,"shares_owned_after_display":"63,922","ownership_form":"D","is_10b5_1":null,"transaction_date":"2015-06-30","filed_date":"2015-07-02","scope":"insider"},{"id":8225213,"accession":"0001209191-15-055490","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001209191-15-055490","line_url":"/filing/0001209191-15-055490#line-1","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (Vice President-Technical Svcs)","role_mark":"O","role_mark_label":"Officer (Vice President-Technical Svcs)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Vice President-Technical Svcs.","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":2500.0,"shares_display":"2,500","price_per_share":23.32,"price_display":"23.32","price_state":"stated","total_value":58300.0,"total_display":"58,300.00","total_whole":"58,300","shares_owned_after":66422.0,"shares_owned_after_display":"66,422","ownership_form":"D","is_10b5_1":null,"transaction_date":"2015-06-19","filed_date":"2015-06-22","scope":"insider"},{"id":8648274,"accession":"0001209191-15-054763","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001209191-15-054763","line_url":"/filing/0001209191-15-054763#line-1","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (Vice President-Technical Svcs)","role_mark":"O","role_mark_label":"Officer (Vice President-Technical Svcs)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Vice President-Technical Svcs.","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":3372.0,"shares_display":"3,372","price_per_share":23.2,"price_display":"23.20","price_state":"stated","total_value":78230.4,"total_display":"78,230.40","total_whole":"78,230","shares_owned_after":68922.0,"shares_owned_after_display":"68,922","ownership_form":"D","is_10b5_1":null,"transaction_date":"2015-06-17","filed_date":"2015-06-18","scope":"insider"},{"id":8793454,"accession":"0001209191-15-052710","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001209191-15-052710","line_url":"/filing/0001209191-15-052710#line-1","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (Vice President-Technical Svcs)","role_mark":"O","role_mark_label":"Officer (Vice President-Technical Svcs)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Vice President-Technical Svcs.","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":6628.0,"shares_display":"6,628","price_per_share":23.97,"price_display":"23.97","price_state":"stated","total_value":158873.16,"total_display":"158,873.16","total_whole":"158,873","shares_owned_after":68228.0,"shares_owned_after_display":"68,228","ownership_form":"D","is_10b5_1":null,"transaction_date":"2015-06-10","filed_date":"2015-06-12","scope":"insider"},{"id":4897683,"accession":"0001209191-13-055929","txn_seq":6,"anchor":"line-6","filing_url":"/filing/0001209191-13-055929","line_url":"/filing/0001209191-13-055929#line-6","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (Vice President-Technical Svcs)","role_mark":"O","role_mark_label":"Officer (Vice President-Technical Svcs)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Vice President-Technical Svcs.","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":4164.0,"shares_display":"4,164","price_per_share":28.5,"price_display":"28.50","price_state":"stated","total_value":118674.0,"total_display":"118,674.00","total_whole":"118,674","shares_owned_after":45010.0,"shares_owned_after_display":"45,010","ownership_form":"D","is_10b5_1":null,"transaction_date":"2013-12-06","filed_date":"2013-12-09","scope":"insider"},{"id":4897679,"accession":"0001209191-13-055929","txn_seq":5,"anchor":"line-5","filing_url":"/filing/0001209191-13-055929","line_url":"/filing/0001209191-13-055929","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (Vice President-Technical Svcs)","role_mark":"O","role_mark_label":"Officer (Vice President-Technical Svcs)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Vice President-Technical Svcs.","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":836.0,"shares_display":"836","price_per_share":28.628373205741628,"price_display":"28.63","price_state":"stated","total_value":23933.32,"total_display":"23,933.32","total_whole":"23,933","shares_owned_after":49321.0,"shares_owned_after_display":"49,321","ownership_form":"D","is_10b5_1":null,"transaction_date":"2013-12-05","filed_date":"2013-12-09","scope":"insider","n_lines":5},{"id":4351938,"accession":"0001209191-13-017677","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001209191-13-017677","line_url":"/filing/0001209191-13-017677#line-1","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (Vice President-Technical Svcs)","role_mark":"O","role_mark_label":"Officer (Vice President-Technical Svcs)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"Vice President-Technical Svcs.","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":18.91,"price_display":"18.91","price_state":"stated","total_value":94550.0,"total_display":"94,550.00","total_whole":"94,550","shares_owned_after":40010.0,"shares_owned_after_display":"40,010","ownership_form":"D","is_10b5_1":null,"transaction_date":"2013-03-18","filed_date":"2013-03-20","scope":"insider"},{"id":3461254,"accession":"0001209191-08-036386","txn_seq":10,"anchor":"line-10","filing_url":"/filing/0001209191-08-036386","line_url":"/filing/0001209191-08-036386#line-10","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP - Technical Services)","role_mark":"O","role_mark_label":"Officer (VP - Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP - Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":4700.0,"shares_display":"4,700","price_per_share":30.5,"price_display":"30.50","price_state":"stated","total_value":143350.0,"total_display":"143,350.00","total_whole":"143,350","shares_owned_after":25200.0,"shares_owned_after_display":"25,200","ownership_form":"D","is_10b5_1":null,"transaction_date":"2008-06-09","filed_date":"2008-06-11","scope":"insider"},{"id":3461253,"accession":"0001209191-08-036386","txn_seq":9,"anchor":"line-9","filing_url":"/filing/0001209191-08-036386","line_url":"/filing/0001209191-08-036386#line-9","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP - Technical Services)","role_mark":"O","role_mark_label":"Officer (VP - Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP - Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":2600.0,"shares_display":"2,600","price_per_share":30.7,"price_display":"30.70","price_state":"stated","total_value":79820.0,"total_display":"79,820.00","total_whole":"79,820","shares_owned_after":21000.0,"shares_owned_after_display":"21,000","ownership_form":"D","is_10b5_1":null,"transaction_date":"2008-06-09","filed_date":"2008-06-11","scope":"insider"},{"id":3461250,"accession":"0001209191-08-036386","txn_seq":8,"anchor":"line-8","filing_url":"/filing/0001209191-08-036386","line_url":"/filing/0001209191-08-036386#line-8","is_derivative":false,"issuer_cik":"0001084991","issuer_name":"NATURAL GAS SERVICES GROUP INC","issuer_ticker":"NGS","issuer_name_source":null,"issuer_url":"/issuer/0001084991","owner_cik":"0001340731","owner_name":"Hazlett James R","owner_display_name":"Hazlett James R","owner_url":"/insider/0001340731","role":"Officer (VP - Technical Services)","role_mark":"O","role_mark_label":"Officer (VP - Technical Services)","role_mark_generic":"Officer","n_reporting_owners":null,"other_reporting_owners":null,"officer_title":"VP - Technical Services","security_title":"Common Stock","transaction_code":"S","transaction_label":"Open-market sale","open_market":true,"acquired_disposed":"D","direction_word":"disposed","shares":1000.0,"shares_display":"1,000","price_per_share":30.6,"price_display":"30.60","price_state":"stated","total_value":30600.0,"total_display":"30,600.00","total_whole":"30,600","shares_owned_after":23600.0,"shares_owned_after_display":"23,600","ownership_form":"D","is_10b5_1":null,"transaction_date":"2008-06-09","filed_date":"2008-06-11","scope":"insider"}],"collapsed":true,"next_cursor":"2008-06-09|3461250","ledger_fault":false,"count":{"value":81,"kind":"exact"},"open_market_only":false,"composition":{"kind":"exact","rows":[{"code":"P","label":"Open-market purchase","n":1,"open_market":true},{"code":"S","label":"Open-market sale","n":80,"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":81},"affiliations":[{"type":"issuer","type_label":"ISSUER","cik":"0001084991","name":"NATURAL GAS SERVICES GROUP INC","url":"/issuer/0001084991","role":"Officer (VP - Technical Services)","n_filings":31,"first_seen":"2006-03-29","last_seen":"2022-06-08"}],"order_statement":"Newest transaction date first, id breaking the tie.","canonical_url":"https://ebomi.com/insider/0001340731","retrieved_at":"2026-08-24T09:39:43+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"}}