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The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes unvested time vesting share units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d)."}],"balance_after":353989,"source":{"system":"sec-edgar","filing":"0000949157-21-000045","document":"wf-form4_161497885447362.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/949157/000094915721000045/wf-form4_161497885447362.xml","form_type":"4"}},{"id":2815992,"issuer":{"id":3947,"kind":"organization","name":"CENTURY ALUMINUM CO"},"owners":[{"id":35934,"kind":"person","name":"BLESS MICHAEL A","position":1,"cik":"0001204903","reported_name":"BLESS MICHAEL A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-03-03T21:49:13.000Z","date":"2021-03-02","kind":"sale","acquired":false,"shares":10000,"price":16.4,"value":164000.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This transaction was executed in multiple trades at prices ranging from $16.25 to $16.62. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes unvested time vesting share units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d)."}],"balance_after":368989,"source":{"system":"sec-edgar","filing":"0000949157-21-000036","document":"wf-form4_161480813500612.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/949157/000094915721000036/wf-form4_161480813500612.xml","form_type":"4"}},{"id":2815991,"issuer":{"id":3947,"kind":"organization","name":"CENTURY ALUMINUM CO"},"owners":[{"id":35934,"kind":"person","name":"BLESS MICHAEL A","position":1,"cik":"0001204903","reported_name":"BLESS MICHAEL A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-03-03T21:49:13.000Z","date":"2021-03-02","kind":"sale","acquired":false,"shares":25000,"price":16.4,"value":410000.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $16.15 to $16.75. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes unvested time vesting share units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d)."}],"balance_after":378989,"source":{"system":"sec-edgar","filing":"0000949157-21-000036","document":"wf-form4_161480813500612.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/949157/000094915721000036/wf-form4_161480813500612.xml","form_type":"4"}},{"id":2815990,"issuer":{"id":3947,"kind":"organization","name":"CENTURY ALUMINUM CO"},"owners":[{"id":35934,"kind":"person","name":"BLESS MICHAEL A","position":1,"cik":"0001204903","reported_name":"BLESS MICHAEL A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-03-03T21:49:13.000Z","date":"2021-03-01","kind":"sale","acquired":false,"shares":7500,"price":14.45,"value":108375.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This transaction was executed in multiple trades at prices ranging from $14.38 to $14.45. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes unvested time vesting share units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d)."}],"balance_after":403989,"source":{"system":"sec-edgar","filing":"0000949157-21-000036","document":"wf-form4_161480813500612.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/949157/000094915721000036/wf-form4_161480813500612.xml","form_type":"4"}},{"id":2830682,"issuer":{"id":3947,"kind":"organization","name":"CENTURY ALUMINUM CO"},"owners":[{"id":35934,"kind":"person","name":"BLESS MICHAEL A","position":1,"cik":"0001204903","reported_name":"BLESS MICHAEL A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-02-26T21:34:28.000Z","date":"2021-02-25","kind":"sale","acquired":false,"shares":15000,"price":14.95,"value":224250.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"This transaction was executed in multiple trades at prices ranging from $14.73 to $15.23. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d)."}],"balance_after":411489,"source":{"system":"sec-edgar","filing":"0000949157-21-000031","document":"wf-form4_161437522908370.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/949157/000094915721000031/wf-form4_161437522908370.xml","form_type":"4"}},{"id":2830681,"issuer":{"id":3947,"kind":"organization","name":"CENTURY ALUMINUM CO"},"owners":[{"id":35934,"kind":"person","name":"BLESS MICHAEL A","position":1,"cik":"0001204903","reported_name":"BLESS MICHAEL A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-02-26T21:34:28.000Z","date":"2021-02-24","kind":"sale","acquired":false,"shares":15000,"price":15.22,"value":228300.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"This transaction was executed in multiple trades at prices ranging from $15.00 to $15.44. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d)."}],"balance_after":426489,"source":{"system":"sec-edgar","filing":"0000949157-21-000031","document":"wf-form4_161437522908370.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/949157/000094915721000031/wf-form4_161437522908370.xml","form_type":"4"}},{"id":2830680,"issuer":{"id":3947,"kind":"organization","name":"CENTURY ALUMINUM CO"},"owners":[{"id":35934,"kind":"person","name":"BLESS MICHAEL A","position":1,"cik":"0001204903","reported_name":"BLESS MICHAEL A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-02-26T21:34:28.000Z","date":"2021-02-24","kind":"sale","acquired":false,"shares":25000,"price":14.79,"value":369750.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This transaction was executed in multiple trades at prices ranging from $14.515 to $15.085. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d)."}],"balance_after":441489,"source":{"system":"sec-edgar","filing":"0000949157-21-000031","document":"wf-form4_161437522908370.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/949157/000094915721000031/wf-form4_161437522908370.xml","form_type":"4"}},{"id":2836853,"issuer":{"id":3947,"kind":"organization","name":"CENTURY ALUMINUM CO"},"owners":[{"id":35934,"kind":"person","name":"BLESS MICHAEL A","position":1,"cik":"0001204903","reported_name":"BLESS MICHAEL A","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"President and CEO"}}],"security":"Common Stock","published_at":"2021-02-24T21:24:07.000Z","date":"2021-02-22","kind":"sale","acquired":false,"shares":12500,"price":14.34,"value":179250.0,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"This transaction was executed in multiple trades at prices ranging from $14.21 to $14.47. The price reported above reflects the weighted average sale price. The Reporting Person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"Includes unvested time vesting units granted to the Reporting Person pursuant to Issuer's 2019-2021, 2020-2022 and 2021-2023 Long-Term Incentive Plans under Rule 16b-3(d)."}],"balance_after":466489,"source":{"system":"sec-edgar","filing":"0000949157-21-000030","document":"wf-form4_161420182278291.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/949157/000094915721000030/wf-form4_161420182278291.xml","form_type":"4"}},{"id":2860504,"issuer":{"id":3689,"kind":"organization","name":"Simpson Manufacturing Co., Inc.","symbol":"SSD"},"owners":[{"id":35934,"kind":"person","name":"BLESS MICHAEL A","position":1,"cik":"0001204903","reported_name":"BLESS MICHAEL A","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2021-02-16T21:38:38.000Z","date":"2021-02-12","kind":"sale","acquired":false,"shares":346,"price":95.51,"value":33046.46,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported is a weighted average sales price. 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