{"entity":{"type":"insider","cik":"0001257603","url":"/insider/0001257603","json_url":"/insider/0001257603.json","name":"CAMPBELL H STUART","name_source":"as-filed","also_issuer":false,"cross_url":null},"coverage_statement":{"n_transactions":23,"n_filings":18,"first":"2013-03-07","last":"2018-06-20","span_basis":"filed_date"},"name_variants":[{"name":"CAMPBELL H STUART","source":"filing","n_filings":18,"first_seen":"2013-03-07","last_seen":"2018-06-20"}],"transactions":[{"id":6375397,"accession":"0001228924-18-000023","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001228924-18-000023","line_url":"/filing/0001228924-18-000023#line-1","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":989.0,"shares_display":"989","price_per_share":191.1677,"price_display":"191.17","price_state":"stated","total_value":189064.8553,"total_display":"189,064.86","total_whole":"189,065","shares_owned_after":41527.0,"shares_owned_after_display":"41,527","ownership_form":"D","is_10b5_1":null,"transaction_date":"2018-06-11","filed_date":"2018-06-20","scope":"insider"},{"id":4841231,"accession":"0001228924-17-000039","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001228924-17-000039","line_url":"/filing/0001228924-17-000039#line-1","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":1000.0,"shares_display":"1,000","price_per_share":130.16,"price_display":"130.16","price_state":"stated","total_value":130160.0,"total_display":"130,160.00","total_whole":"130,160","shares_owned_after":42366.0,"shares_owned_after_display":"42,366","ownership_form":"D","is_10b5_1":null,"transaction_date":"2017-08-21","filed_date":"2017-08-22","scope":"insider"},{"id":4635065,"accession":"0001228924-17-000038","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001228924-17-000038","line_url":"/filing/0001228924-17-000038#line-2","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":1000.0,"shares_display":"1,000","price_per_share":130.0,"price_display":"130.00","price_state":"stated","total_value":130000.0,"total_display":"130,000.00","total_whole":"130,000","shares_owned_after":43366.0,"shares_owned_after_display":"43,366","ownership_form":"D","is_10b5_1":null,"transaction_date":"2017-08-18","filed_date":"2017-08-21","scope":"insider"},{"id":4635059,"accession":"0001228924-17-000038","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001228924-17-000038","line_url":"/filing/0001228924-17-000038#line-1","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":1000.0,"shares_display":"1,000","price_per_share":130.83,"price_display":"130.83","price_state":"stated","total_value":130830.0,"total_display":"130,830.00","total_whole":"130,830","shares_owned_after":44366.0,"shares_owned_after_display":"44,366","ownership_form":"D","is_10b5_1":null,"transaction_date":"2017-08-17","filed_date":"2017-08-21","scope":"insider"},{"id":4954364,"accession":"0001228924-17-000037","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001228924-17-000037","line_url":"/filing/0001228924-17-000037#line-1","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":2.0,"shares_display":"2","price_per_share":134.1,"price_display":"134.10","price_state":"stated","total_value":268.2,"total_display":"268.20","total_whole":"268","shares_owned_after":45366.0,"shares_owned_after_display":"45,366","ownership_form":"D","is_10b5_1":null,"transaction_date":"2017-08-15","filed_date":"2017-08-16","scope":"insider"},{"id":5186717,"accession":"0001228924-17-000036","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001228924-17-000036","line_url":"/filing/0001228924-17-000036#line-1","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":608.0,"shares_display":"608","price_per_share":134.08,"price_display":"134.08","price_state":"stated","total_value":81520.64,"total_display":"81,520.64","total_whole":"81,521","shares_owned_after":45368.0,"shares_owned_after_display":"45,368","ownership_form":"D","is_10b5_1":null,"transaction_date":"2017-08-11","filed_date":"2017-08-15","scope":"insider"},{"id":4173929,"accession":"0001228924-17-000035","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001228924-17-000035","line_url":"/filing/0001228924-17-000035#line-1","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":1000.0,"shares_display":"1,000","price_per_share":136.58,"price_display":"136.58","price_state":"stated","total_value":136580.0,"total_display":"136,580.00","total_whole":"136,580","shares_owned_after":45976.0,"shares_owned_after_display":"45,976","ownership_form":"D","is_10b5_1":null,"transaction_date":"2017-08-10","filed_date":"2017-08-11","scope":"insider"},{"id":4426558,"accession":"0001228924-17-000034","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001228924-17-000034","line_url":"/filing/0001228924-17-000034#line-1","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":1000.0,"shares_display":"1,000","price_per_share":137.61,"price_display":"137.61","price_state":"stated","total_value":137610.0,"total_display":"137,610.00","total_whole":"137,610","shares_owned_after":46976.0,"shares_owned_after_display":"46,976","ownership_form":"D","is_10b5_1":null,"transaction_date":"2017-08-09","filed_date":"2017-08-11","scope":"insider"},{"id":4717893,"accession":"0001228924-17-000033","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001228924-17-000033","line_url":"/filing/0001228924-17-000033#line-1","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":1000.0,"shares_display":"1,000","price_per_share":143.09,"price_display":"143.09","price_state":"stated","total_value":143090.0,"total_display":"143,090.00","total_whole":"143,090","shares_owned_after":47976.0,"shares_owned_after_display":"47,976","ownership_form":"D","is_10b5_1":null,"transaction_date":"2017-08-04","filed_date":"2017-08-04","scope":"insider"},{"id":4127735,"accession":"0001228924-17-000032","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001228924-17-000032","line_url":"/filing/0001228924-17-000032#line-2","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":1000.0,"shares_display":"1,000","price_per_share":143.12,"price_display":"143.12","price_state":"stated","total_value":143120.0,"total_display":"143,120.00","total_whole":"143,120","shares_owned_after":48976.0,"shares_owned_after_display":"48,976","ownership_form":"D","is_10b5_1":null,"transaction_date":"2017-08-03","filed_date":"2017-08-04","scope":"insider"},{"id":4127732,"accession":"0001228924-17-000032","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001228924-17-000032","line_url":"/filing/0001228924-17-000032#line-1","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":1000.0,"shares_display":"1,000","price_per_share":143.61,"price_display":"143.61","price_state":"stated","total_value":143610.0,"total_display":"143,610.00","total_whole":"143,610","shares_owned_after":49976.0,"shares_owned_after_display":"49,976","ownership_form":"D","is_10b5_1":null,"transaction_date":"2017-08-02","filed_date":"2017-08-04","scope":"insider"},{"id":4876533,"accession":"0001228924-17-000003","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001228924-17-000003","line_url":"/filing/0001228924-17-000003#line-1","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":8000.0,"shares_display":"8,000","price_per_share":121.55,"price_display":"121.55","price_state":"stated","total_value":972400.0,"total_display":"972,400.00","total_whole":"972,400","shares_owned_after":55930.0,"shares_owned_after_display":"55,930","ownership_form":"D","is_10b5_1":null,"transaction_date":"2017-02-07","filed_date":"2017-02-08","scope":"insider"},{"id":2797710,"accession":"0001228924-16-000048","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001228924-16-000048","line_url":"/filing/0001228924-16-000048#line-1","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":4000.0,"shares_display":"4,000","price_per_share":119.02,"price_display":"119.02","price_state":"stated","total_value":476080.0,"total_display":"476,080.00","total_whole":"476,080","shares_owned_after":63930.0,"shares_owned_after_display":"63,930","ownership_form":"D","is_10b5_1":null,"transaction_date":"2016-10-21","filed_date":"2016-10-25","scope":"insider"},{"id":2566850,"accession":"0001228924-16-000047","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001228924-16-000047","line_url":"/filing/0001228924-16-000047#line-1","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":3000.0,"shares_display":"3,000","price_per_share":115.03,"price_display":"115.03","price_state":"stated","total_value":345090.0,"total_display":"345,090.00","total_whole":"345,090","shares_owned_after":67930.0,"shares_owned_after_display":"67,930","ownership_form":"D","is_10b5_1":null,"transaction_date":"2016-09-16","filed_date":"2016-10-12","scope":"insider"},{"id":2389236,"accession":"0001228924-16-000032","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001228924-16-000032","line_url":"/filing/0001228924-16-000032#line-2","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":3816.0,"shares_display":"3,816","price_per_share":86.45,"price_display":"86.45","price_state":"stated","total_value":329893.2,"total_display":"329,893.20","total_whole":"329,893","shares_owned_after":70071.0,"shares_owned_after_display":"70,071","ownership_form":"D","is_10b5_1":null,"transaction_date":"2016-03-11","filed_date":"2016-03-11","scope":"insider"},{"id":2389228,"accession":"0001228924-16-000032","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001228924-16-000032","line_url":"/filing/0001228924-16-000032#line-1","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":2184.0,"shares_display":"2,184","price_per_share":86.09,"price_display":"86.09","price_state":"stated","total_value":188020.56,"total_display":"188,020.56","total_whole":"188,021","shares_owned_after":73887.0,"shares_owned_after_display":"73,887","ownership_form":"D","is_10b5_1":null,"transaction_date":"2016-03-10","filed_date":"2016-03-11","scope":"insider"},{"id":2797693,"accession":"0001228924-16-000031","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001228924-16-000031","line_url":"/filing/0001228924-16-000031#line-1","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":280.0,"shares_display":"280","price_per_share":90.0,"price_display":"90.00","price_state":"stated","total_value":25200.0,"total_display":"25,200.00","total_whole":"25,200","shares_owned_after":76071.0,"shares_owned_after_display":"76,071","ownership_form":"D","is_10b5_1":null,"transaction_date":"2016-03-07","filed_date":"2016-03-09","scope":"insider"},{"id":2297802,"accession":"0001228924-16-000030","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001228924-16-000030","line_url":"/filing/0001228924-16-000030#line-1","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":"A","direction_word":"acquired","shares":1903.0,"shares_display":"1,903","price_per_share":90.84,"price_display":"90.84","price_state":"stated","total_value":172868.52,"total_display":"172,868.52","total_whole":"172,869","shares_owned_after":76351.0,"shares_owned_after_display":"76,351","ownership_form":"D","is_10b5_1":null,"transaction_date":"2016-02-29","filed_date":"2016-03-04","scope":"insider"},{"id":2895053,"accession":"0001228924-16-000029","txn_seq":3,"anchor":"line-3","filing_url":"/filing/0001228924-16-000029","line_url":"/filing/0001228924-16-000029#line-3","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":1500.0,"shares_display":"1,500","price_per_share":92.75,"price_display":"92.75","price_state":"stated","total_value":139125.0,"total_display":"139,125.00","total_whole":"139,125","shares_owned_after":78254.0,"shares_owned_after_display":"78,254","ownership_form":"D","is_10b5_1":null,"transaction_date":"2016-02-24","filed_date":"2016-02-25","scope":"insider"},{"id":2895048,"accession":"0001228924-16-000029","txn_seq":2,"anchor":"line-2","filing_url":"/filing/0001228924-16-000029","line_url":"/filing/0001228924-16-000029#line-2","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":12.0,"shares_display":"12","price_per_share":100.0,"price_display":"100.00","price_state":"stated","total_value":1200.0,"total_display":"1,200.00","total_whole":"1,200","shares_owned_after":79754.0,"shares_owned_after_display":"79,754","ownership_form":"D","is_10b5_1":null,"transaction_date":"2016-02-23","filed_date":"2016-02-25","scope":"insider"},{"id":2895043,"accession":"0001228924-16-000029","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001228924-16-000029","line_url":"/filing/0001228924-16-000029#line-1","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":20.0,"shares_display":"20","price_per_share":100.0,"price_display":"100.00","price_state":"stated","total_value":2000.0,"total_display":"2,000.00","total_whole":"2,000","shares_owned_after":79766.0,"shares_owned_after_display":"79,766","ownership_form":"D","is_10b5_1":null,"transaction_date":"2016-02-22","filed_date":"2016-02-25","scope":"insider"},{"id":8377905,"accession":"0001228924-15-000024","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001228924-15-000024","line_url":"/filing/0001228924-15-000024#line-1","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":"P","transaction_label":"Open-market purchase","open_market":true,"acquired_disposed":"A","direction_word":"acquired","shares":150.0,"shares_display":"150","price_per_share":109.54,"price_display":"109.54","price_state":"stated","total_value":16431.0,"total_display":"16,431.00","total_whole":"16,431","shares_owned_after":78848.0,"shares_owned_after_display":"78,848","ownership_form":"D","is_10b5_1":null,"transaction_date":"2015-09-22","filed_date":"2015-09-23","scope":"insider"},{"id":4242651,"accession":"0001228924-13-000003","txn_seq":1,"anchor":"line-1","filing_url":"/filing/0001228924-13-000003","line_url":"/filing/0001228924-13-000003#line-1","is_derivative":false,"issuer_cik":"0000724004","issuer_name":"MESA LABORATORIES INC /CO","issuer_ticker":"MLAB","issuer_name_source":null,"issuer_url":"/issuer/0000724004","owner_cik":"0001257603","owner_name":"CAMPBELL H STUART","owner_display_name":"CAMPBELL H STUART","owner_url":"/insider/0001257603","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":30000.0,"shares_display":"30,000","price_per_share":52.75,"price_display":"52.75","price_state":"stated","total_value":1582500.0,"total_display":"1,582,500.00","total_whole":"1,582,500","shares_owned_after":75848.0,"shares_owned_after_display":"75,848","ownership_form":"D","is_10b5_1":null,"transaction_date":"2013-03-05","filed_date":"2013-03-07","scope":"insider"}],"collapsed":true,"next_cursor":null,"ledger_fault":false,"count":{"value":23,"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":22,"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":23},"affiliations":[{"type":"issuer","type_label":"ISSUER","cik":"0000724004","name":"MESA LABORATORIES INC /CO","url":"/issuer/0000724004","role":"Director","n_filings":18,"first_seen":"2013-03-07","last_seen":"2018-06-20"}],"order_statement":"Newest transaction date first, id breaking the tie.","canonical_url":"https://ebomi.com/insider/0001257603","retrieved_at":"2026-08-25T02:25:14+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"}}