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These shares were purchased in multiple transactions at prices ranging from $1.79 to $1.85."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 19,824 vested restricted stock units and 1,960 restricted stock units which vest on April 27, 2020 and all of which settle within thirty days following the earliest of (i) one year following the termination of the Reporting Person's service for any reason other than cause, (ii) a change of control or (iii) the fifth anniversary of the grant date. Also, includes 22,007 restricted stock units which vest on February 28, 2020 and settle within thirty days of the vesting date."}],"balance_after":168791,"source":{"system":"sec-edgar","filing":"0001562762-19-000220","document":"certent-form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1692427/000156276219000220/certent-form4.xml","form_type":"4"}},{"id":3437651,"issuer":{"id":6562,"kind":"organization","name":"NCS Multistage Holdings, Inc."},"owners":[{"id":22137,"kind":"person","name":"MYERS FRANKLIN","position":1,"cik":"0001207002","reported_name":"MYERS FRANKLIN","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-08-15T20:33:07.000Z","date":"2019-08-14","kind":"purchase","acquired":true,"shares":15000,"price":1.99,"value":29850.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $1.93 to $2.04."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 19,824 vested restricted stock units and 1,960 restricted stock units which vest on April 27, 2020 and all of which settle within thirty days following the earliest of (i) one year following the termination of the Reporting Person's service for any reason other than cause, (ii) a change of control or (iii) the fifth anniversary of the grant date. Also, includes 22,007 restricted stock units which vest on February 28, 2020 and settle within thirty days of the vesting date."}],"balance_after":153791,"source":{"system":"sec-edgar","filing":"0001562762-19-000220","document":"certent-form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1692427/000156276219000220/certent-form4.xml","form_type":"4"}},{"id":3437650,"issuer":{"id":6562,"kind":"organization","name":"NCS Multistage Holdings, Inc."},"owners":[{"id":22137,"kind":"person","name":"MYERS FRANKLIN","position":1,"cik":"0001207002","reported_name":"MYERS FRANKLIN","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-08-15T20:33:07.000Z","date":"2019-08-13","kind":"purchase","acquired":true,"shares":12500,"price":2.4,"value":30000.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.29 to $2.48. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in footnotes (1), (3) and (4) to this Form 4."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 19,824 vested restricted stock units and 1,960 restricted stock units which vest on April 27, 2020 and all of which settle within thirty days following the earliest of (i) one year following the termination of the Reporting Person's service for any reason other than cause, (ii) a change of control or (iii) the fifth anniversary of the grant date. Also, includes 22,007 restricted stock units which vest on February 28, 2020 and settle within thirty days of the vesting date."}],"balance_after":138791,"source":{"system":"sec-edgar","filing":"0001562762-19-000220","document":"certent-form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1692427/000156276219000220/certent-form4.xml","form_type":"4"}},{"id":3439988,"issuer":{"id":6562,"kind":"organization","name":"NCS Multistage Holdings, Inc."},"owners":[{"id":22137,"kind":"person","name":"MYERS FRANKLIN","position":1,"cik":"0001207002","reported_name":"MYERS FRANKLIN","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-08-13T20:27:36.000Z","date":"2019-08-12","kind":"purchase","acquired":true,"shares":7500,"price":2.34,"value":17550.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.25 to $2.45. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 19,824 vested restricted stock units and 1,960 restricted stock units which vest on April 27, 2020 and all of which settle within thirty days following the earliest of (i) one year following the termination of the Reporting Person's service for any reason other than cause, (ii) a change of control or (iii) the fifth anniversary of the grant date. Also, includes 22,007 restricted stock units which vest on February 28, 2020 and settle within thirty days of the vesting date."}],"balance_after":126291,"source":{"system":"sec-edgar","filing":"0001562762-19-000197","document":"certent-form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1692427/000156276219000197/certent-form4.xml","form_type":"4"}},{"id":3442461,"issuer":{"id":6562,"kind":"organization","name":"NCS Multistage Holdings, Inc."},"owners":[{"id":22137,"kind":"person","name":"MYERS FRANKLIN","position":1,"cik":"0001207002","reported_name":"MYERS FRANKLIN","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-08-09T20:30:09.000Z","date":"2019-08-08","kind":"purchase","acquired":true,"shares":25000,"price":2.13,"value":53250.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $1.9 to $2.27. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 19,824 vested restricted stock units and 1,960 restricted stock units which vest on April 27, 2020 and all of which settle within thirty days following the earliest of (i) one year following the termination of the Reporting Person's service for any reason other than cause, (ii) a change of control or (iii) the fifth anniversary of the grant date. Also, includes 22,007 restricted stock units which vest on February 28, 2020 and settle within thirty days of the vesting date."}],"balance_after":118791,"source":{"system":"sec-edgar","filing":"0001562762-19-000193","document":"certent-form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1692427/000156276219000193/certent-form4.xml","form_type":"4"}},{"id":3446332,"issuer":{"id":132880,"kind":"organization","name":"HollyFrontier Corp","symbol":"HFC"},"owners":[{"id":22137,"kind":"person","name":"MYERS FRANKLIN","position":1,"cik":"0001207002","reported_name":"MYERS FRANKLIN","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-08-06T16:22:29.000Z","date":"2019-08-05","kind":"purchase","acquired":true,"shares":2500,"price":49.72,"value":124300.0,"ownership":{"direct":true},"balance_after":24989,"source":{"system":"sec-edgar","filing":"0001209191-19-044813","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/48039/000120919119044813/doc4.xml","form_type":"4"}},{"id":3451094,"issuer":{"id":3020,"kind":"organization","name":"COMFORT SYSTEMS USA INC"},"owners":[{"id":22137,"kind":"person","name":"MYERS FRANKLIN","position":1,"cik":"0001207002","reported_name":"MYERS FRANKLIN","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Chairman of the Board"}}],"security":"Common Stock","published_at":"2019-08-01T18:51:23.000Z","date":"2019-08-01","kind":"purchase","acquired":true,"shares":5500,"price":41.8909,"value":230399.95,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Represents the average price of shares purchased; full information regarding the number of shares purchased and specific prices will be made available upon request to the Company's Office of the General Counsel."}],"balance_after":250000,"source":{"system":"sec-edgar","filing":"0001179110-19-008953","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1035983/000117911019008953/edgar.xml","form_type":"4"}},{"id":3510393,"issuer":{"id":6562,"kind":"organization","name":"NCS Multistage Holdings, Inc."},"owners":[{"id":22137,"kind":"person","name":"MYERS FRANKLIN","position":1,"cik":"0001207002","reported_name":"MYERS FRANKLIN","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-05-28T20:38:20.000Z","date":"2019-05-24","kind":"purchase","acquired":true,"shares":40000,"price":2.57,"value":102800.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $2.55 to $2.59. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the ranges set forth in this footnote."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes 19,824 vested restricted stock units and 1,960 restricted stock units which vest on April 27, 2020 and all of which settle within thirty days following the earliest of (i) one year following the termination of the Reporting Person's service for any reason other than cause, (ii) a change of control or (iii) the fifth anniversary of the grant date. Also, includes 22,007 restricted stock units which vest on February 28, 2020 and settle within thirty days of the vesting date."}],"balance_after":93791,"source":{"system":"sec-edgar","filing":"0001562762-19-000135","document":"certent-form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1692427/000156276219000135/certent-form4.xml","form_type":"4"}},{"id":3513778,"issuer":{"id":3020,"kind":"organization","name":"COMFORT SYSTEMS USA INC"},"owners":[{"id":22137,"kind":"person","name":"MYERS FRANKLIN","position":1,"cik":"0001207002","reported_name":"MYERS FRANKLIN","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Chairman of the Board"}}],"security":"Common Stock","published_at":"2019-05-23T15:57:20.000Z","date":"2019-05-22","kind":"purchase","acquired":true,"shares":1738,"price":49.4499,"value":85943.9262,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F2","text":"Represents the average price of shares purchased; full information regarding the number of shares purchased and specific prices will be made available upon request to the Company's Office of the General Counsel."}],"balance_after":244500,"source":{"system":"sec-edgar","filing":"0001179110-19-006566","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1035983/000117911019006566/edgar.xml","form_type":"4"}},{"id":3513777,"issuer":{"id":3020,"kind":"organization","name":"COMFORT SYSTEMS USA INC"},"owners":[{"id":22137,"kind":"person","name":"MYERS FRANKLIN","position":1,"cik":"0001207002","reported_name":"MYERS FRANKLIN","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Chairman of the Board"}}],"security":"Common Stock","published_at":"2019-05-23T15:57:20.000Z","date":"2019-05-21","kind":"grant","acquired":true,"shares":3262,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Shares granted pursuant to the 2017 Omnibus Incentive Plan as approved by the stockholders on May 23, 2017. Non-employee directors are given an annual grant of Comfort Systems USA Common Stock following election or reelection at the Company's annual stockholders' meeting. This year's grant is equal to $160,000 as rounded down to the nearest whole share based on the average of the high and low price of the Company's Common Stock on the day of the annual stockholders' meeting."}],"balance_after":242762,"source":{"system":"sec-edgar","filing":"0001179110-19-006566","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1035983/000117911019006566/edgar.xml","form_type":"4"}},{"id":3534626,"issuer":{"id":132880,"kind":"organization","name":"HollyFrontier Corp","symbol":"HFC"},"owners":[{"id":22137,"kind":"person","name":"MYERS FRANKLIN","position":1,"cik":"0001207002","reported_name":"MYERS FRANKLIN","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-05-09T16:46:20.000Z","date":"2019-05-09","kind":"purchase","acquired":true,"shares":2900,"price":42.78,"value":124062.0,"ownership":{"direct":true},"balance_after":22489,"source":{"system":"sec-edgar","filing":"0001209191-19-028506","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/48039/000120919119028506/doc4.xml","form_type":"4"}},{"id":3545699,"issuer":{"id":3020,"kind":"organization","name":"COMFORT SYSTEMS USA INC"},"owners":[{"id":22137,"kind":"person","name":"MYERS FRANKLIN","position":1,"cik":"0001207002","reported_name":"MYERS FRANKLIN","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Chairman of the Board"}}],"security":"Common Stock","published_at":"2019-04-30T14:34:09.000Z","date":"2019-04-29","kind":"purchase","acquired":true,"shares":4500,"price":53.6123,"value":241255.35,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Represents the average price of shares purchased; full information regarding the number of shares purchased and specific prices will be made available upon request to the Company's Office of the General Counsel."}],"balance_after":239500,"source":{"system":"sec-edgar","filing":"0001179110-19-005267","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1035983/000117911019005267/edgar.xml","form_type":"4"}},{"id":3615951,"issuer":{"id":125074,"kind":"organization","name":"ION GEOPHYSICAL CORP","symbol":"IO"},"owners":[{"id":22137,"kind":"person","name":"MYERS FRANKLIN","position":1,"cik":"0001207002","reported_name":"MYERS FRANKLIN","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-03-05T16:21:17.000Z","date":"2019-03-01","kind":"grant","acquired":true,"shares":2500,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Restricted stock grant issued pursuant to the ION Geophysical Corporation Second Amended and Restated 2013 Long Term Incentive Plan. Award will vest upon the one year anniversary of the date shown in Column 2."}],"balance_after":25000,"source":{"system":"sec-edgar","filing":"0001209191-19-016466","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/866609/000120919119016466/doc4.xml","form_type":"4"}},{"id":3619376,"issuer":{"id":6562,"kind":"organization","name":"NCS Multistage Holdings, Inc."},"owners":[{"id":22137,"kind":"person","name":"MYERS FRANKLIN","position":1,"cik":"0001207002","reported_name":"MYERS FRANKLIN","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2019-03-04T21:34:15.000Z","date":"2019-02-28","kind":"grant","acquired":true,"shares":22007,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F1","text":"Includes 17,863 vested restricted stock units and 3,921 restricted stock units which vest in two equal annual installments beginning on April 27, 2019 and all of which settle within thirty days following the earliest of (i) one year following the termination of the Reporting Person's service for any reason other than cause, (ii) a change of control or (iii) the fifth anniversary of the grant date. Also, includes 22,007 restricted stock units which vest on February 28, 2020 and settle within thirty days of the vesting date."}],"balance_after":53791,"source":{"system":"sec-edgar","filing":"0001562762-19-000071","document":"certent-form4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1692427/000156276219000071/certent-form4.xml","form_type":"4"}},{"id":3626938,"issuer":{"id":3020,"kind":"organization","name":"COMFORT SYSTEMS USA INC"},"owners":[{"id":22137,"kind":"person","name":"MYERS FRANKLIN","position":1,"cik":"0001207002","reported_name":"MYERS FRANKLIN","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":true,"other_text":"Chairman of the Board"}}],"security":"Common Stock","published_at":"2019-02-28T20:06:09.000Z","date":"2019-02-27","kind":"purchase","acquired":true,"shares":4000,"price":52.8371,"value":211348.4,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"Represents the average price of shares purchased; full information regarding the number of shares purchased and specific prices will be made available upon request to the Company's Office of the General Counsel."}],"balance_after":235000,"source":{"system":"sec-edgar","filing":"0001179110-19-002783","document":"edgar.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1035983/000117911019002783/edgar.xml","form_type":"4"}}],"next_cursor":"2019-02-28T20:06:09.000000Z,3626938"}