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(\"CD&R Holdings\") directly owns 6,959,976 shares of Common Stock. CD&R Associates VIII, Ltd., as the general partner of CD&R Holdings, CD&R Associates VIII, L.P., as the sole stockholder of CD&R Associates VIII, Ltd., and CD&R Investment Associates VIII, Ltd., as the general partner of CD&R Associates VIII, L.P., may each be deemed to beneficially own the shares of Common Stock held by CD&R Holdings."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Each of CD&R Associates VIII, Ltd., CD&R Associates VIII, L.P. and CD&R Investment Associates VIII, Ltd. expressly disclaims beneficial ownership of the shares of Common Stock held by CD&R Holdings, except to the extent of its pecuniary interest therein."}],"balance_after":6959976,"source":{"system":"sec-edgar","filing":"0001209191-18-031423","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1674087/000120919118031423/doc4.xml","form_type":"4"}},{"id":3925919,"issuer":{"id":4197,"kind":"organization","name":"Atkore Inc."},"owners":[{"id":166480,"kind":"organization","name":"CD&R Allied Holdings, L.P.","position":1,"cik":"0001674087","reported_name":"CD&R Allied Holdings, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166481,"kind":"organization","name":"CD&R Associates VIII, Ltd.","position":2,"cik":"0001474786","reported_name":"CD&R Associates VIII, Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166482,"kind":"organization","name":"CD&R ASSOCIATES VIII, LP","position":3,"cik":"0001474716","reported_name":"CD&R ASSOCIATES VIII, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166483,"kind":"organization","name":"CD&R Investment Associates VIII, Ltd.","position":4,"cik":"0001474785","reported_name":"CD&R Investment Associates VIII, Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2018-05-18T16:31:59.000Z","date":"2018-02-20","kind":"sale","acquired":false,"shares":5792925,"price":21.27,"value":123215514.75,"ownership":{"direct":false,"nature":"By affiliate"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Following the transaction reported herein, CD&R Allied Holdings, L.P. (\"CD&R Holdings\") directly owns 7,234,838 shares of Common Stock. CD&R Associates VIII, Ltd., as the general partner of CD&R Holdings, CD&R Associates VIII, L.P., as the sole stockholder of CD&R Associates VIII, Ltd., and CD&R Investment Associates VIII, Ltd., as the general partner of CD&R Associates VIII, L.P., may each be deemed to beneficially own the shares of Common Stock held by CD&R Holdings."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Each of CD&R Associates VIII, Ltd., CD&R Associates VIII, L.P. and CD&R Investment Associates VIII, Ltd. expressly disclaims beneficial ownership of the shares of Common Stock held by CD&R Holdings, except to the extent of its pecuniary interest therein."}],"balance_after":7234838,"source":{"system":"sec-edgar","filing":"0001209191-18-031419","document":"doc4a.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1674087/000120919118031419/doc4a.xml","form_type":"4/A","original_submission_date":"2018-02-20"}},{"id":4047937,"issuer":{"id":4197,"kind":"organization","name":"Atkore Inc."},"owners":[{"id":166480,"kind":"organization","name":"CD&R Allied Holdings, L.P.","position":1,"cik":"0001674087","reported_name":"CD&R Allied Holdings, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166481,"kind":"organization","name":"CD&R Associates VIII, Ltd.","position":2,"cik":"0001474786","reported_name":"CD&R Associates VIII, Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166482,"kind":"organization","name":"CD&R ASSOCIATES VIII, LP","position":3,"cik":"0001474716","reported_name":"CD&R ASSOCIATES VIII, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166483,"kind":"organization","name":"CD&R Investment Associates VIII, Ltd.","position":4,"cik":"0001474785","reported_name":"CD&R Investment Associates VIII, Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2018-02-20T16:50:32.000Z","date":"2018-02-20","kind":"sale","acquired":false,"shares":5792925,"price":21.27,"value":123215514.75,"ownership":{"direct":false,"nature":"By affiliate"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Following the transaction reported herein, CD&R Allied Holdings, L.P. (\"CD&R Holdings\") directly owns 6,334,838 shares of Common Stock. CD&R Associates VIII, Ltd., as the general partner of CD&R Holdings, CD&R Associates VIII, L.P., as the sole stockholder of CD&R Associates VIII, Ltd., and CD&R Investment Associates VIII, Ltd., as the general partner of CD&R Associates VIII, L.P., may each be deemed to beneficially own the shares of Common Stock held by CD&R Holdings."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Each of CD&R Associates VIII, Ltd., CD&R Associates VIII, L.P. and CD&R Investment Associates VIII, Ltd. expressly disclaims beneficial ownership of the shares of Common Stock held by CD&R Holdings, except to the extent of its pecuniary interest therein."}],"balance_after":6334838,"source":{"system":"sec-edgar","filing":"0001209191-18-011395","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1674087/000120919118011395/doc4.xml","form_type":"4"}},{"id":4055137,"issuer":{"id":4197,"kind":"organization","name":"Atkore Inc."},"owners":[{"id":166480,"kind":"organization","name":"CD&R Allied Holdings, L.P.","position":1,"cik":"0001674087","reported_name":"CD&R Allied Holdings, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166481,"kind":"organization","name":"CD&R Associates VIII, Ltd.","position":2,"cik":"0001474786","reported_name":"CD&R Associates VIII, Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166482,"kind":"organization","name":"CD&R ASSOCIATES VIII, LP","position":3,"cik":"0001474716","reported_name":"CD&R ASSOCIATES VIII, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166483,"kind":"organization","name":"CD&R Investment Associates VIII, Ltd.","position":4,"cik":"0001474785","reported_name":"CD&R Investment Associates VIII, Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2018-02-15T19:37:42.000Z","date":"2018-02-14","kind":"other","acquired":false,"shares":207075,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"By affiliate"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"On February 14, 2018, 207,075 shares of Common Stock directly owned by CD&R Allied Holdings, L.P. were distributed to certain investment professionals who are direct and indirect limited partners of CD&R Associates VIII, L.P., the sole stockholder of the general partner of CD&R Allied Holdings, L.P., in connection with certain charitable gifts made by such investment professionals on February 14, 2018."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Following the transaction reported herein, CD&R Allied Holdings, L.P. (\"CD&R Holdings\") directly owns 13,027,763 shares of Common Stock. CD&R Associates VIII, Ltd., as the general partner of CD&R Holdings, CD&R Associates VIII, L.P., as the sole stockholder of CD&R Associates VIII, Ltd., and CD&R Investment Associates VIII, Ltd., as the general partner of CD&R Associates VIII, L.P., may each be deemed to beneficially own the shares of Common Stock held by CD&R Holdings."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"Each of CD&R Associates VIII, Ltd., CD&R Associates VIII, L.P. and CD&R Investment Associates VIII, Ltd. expressly disclaims beneficial ownership of the shares of Common Stock held by CD&R Holdings, except to the extent of its pecuniary interest therein."}],"balance_after":13027763,"source":{"system":"sec-edgar","filing":"0001209191-18-010545","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1674087/000120919118010545/doc4.xml","form_type":"4"}},{"id":4073834,"issuer":{"id":4197,"kind":"organization","name":"Atkore Inc."},"owners":[{"id":166480,"kind":"organization","name":"CD&R Allied Holdings, L.P.","position":1,"cik":"0001674087","reported_name":"CD&R Allied Holdings, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166481,"kind":"organization","name":"CD&R Associates VIII, Ltd.","position":2,"cik":"0001474786","reported_name":"CD&R Associates VIII, Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166482,"kind":"organization","name":"CD&R ASSOCIATES VIII, LP","position":3,"cik":"0001474716","reported_name":"CD&R ASSOCIATES VIII, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166483,"kind":"organization","name":"CD&R Investment Associates VIII, Ltd.","position":4,"cik":"0001474785","reported_name":"CD&R Investment Associates VIII, Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2018-02-06T16:29:27.000Z","date":"2018-02-02","kind":"sale","acquired":false,"shares":17225539,"price":21.77,"value":374999984.03,"ownership":{"direct":false,"nature":"By affiliate"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Following the transaction reported herein, CD&R Allied Holdings, L.P. (\"CD&R Holdings\") directly owns 13,234,838 shares of Common Stock. CD&R Associates VIII, Ltd., as the general partner of CD&R Holdings, CD&R Associates VIII, L.P., as the sole stockholder of CD&R Associates VIII, Ltd., and CD&R Investment Associates VIII, Ltd., as the general partner of CD&R Associates VIII, L.P., may each be deemed to beneficially own the shares of Common Stock held by CD&R Holdings."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Each of CD&R Associates VIII, Ltd., CD&R Associates VIII, L.P. and CD&R Investment Associates VIII, Ltd. expressly disclaims beneficial ownership of the shares of Common Stock held by CD&R Holdings, except to the extent of its pecuniary interest therein."}],"balance_after":13234838,"source":{"system":"sec-edgar","filing":"0001209191-18-007845","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1674087/000120919118007845/doc4.xml","form_type":"4"}},{"id":4427902,"issuer":{"id":4197,"kind":"organization","name":"Atkore Inc."},"owners":[{"id":166480,"kind":"organization","name":"CD&R Allied Holdings, L.P.","position":1,"cik":"0001674087","reported_name":"CD&R Allied Holdings, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166481,"kind":"organization","name":"CD&R Associates VIII, Ltd.","position":2,"cik":"0001474786","reported_name":"CD&R Associates VIII, Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166482,"kind":"organization","name":"CD&R ASSOCIATES VIII, LP","position":3,"cik":"0001474716","reported_name":"CD&R ASSOCIATES VIII, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166483,"kind":"organization","name":"CD&R Investment Associates VIII, Ltd.","position":4,"cik":"0001474785","reported_name":"CD&R Investment Associates VIII, Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2017-02-23T16:40:43.000Z","date":"2017-02-23","kind":"sale","acquired":false,"shares":10350000,"price":25,"value":258750000.0,"ownership":{"direct":false,"nature":"By affiliate"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Following the transaction reported herein, CD&R Allied Holdings, L.P. (\"CD&R Holdings\") directly owns 30,460,377 shares of Common Stock. CD&R Associates VIII, Ltd., as the general partner of CD&R Holdings, CD&R Associates VIII, L.P., as the sole stockholder of CD&R Associates VIII, Ltd., and CD&R Investment Associates VIII, Ltd., as the general partner of CD&R Associates VIII, L.P., may each be deemed to beneficially own the shares of Common Stock held by CD&R Holdings."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Each of CD&R Associates VIII, Ltd., CD&R Associates VIII, L.P. and CD&R Investment Associates VIII, Ltd. expressly disclaims beneficial ownership of the shares of Common Stock held by CD&R Holdings, except to the extent of its pecuniary interest therein."}],"balance_after":30460377,"source":{"system":"sec-edgar","filing":"0001209191-17-013812","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1674087/000120919117013812/doc4.xml","form_type":"4"}},{"id":4494110,"issuer":{"id":4197,"kind":"organization","name":"Atkore Inc."},"owners":[{"id":166480,"kind":"organization","name":"CD&R Allied Holdings, L.P.","position":1,"cik":"0001674087","reported_name":"CD&R Allied Holdings, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166481,"kind":"organization","name":"CD&R Associates VIII, Ltd.","position":2,"cik":"0001474786","reported_name":"CD&R Associates VIII, Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166482,"kind":"organization","name":"CD&R ASSOCIATES VIII, LP","position":3,"cik":"0001474716","reported_name":"CD&R ASSOCIATES VIII, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166483,"kind":"organization","name":"CD&R Investment Associates VIII, Ltd.","position":4,"cik":"0001474785","reported_name":"CD&R Investment Associates VIII, Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2017-01-10T16:34:07.000Z","date":"2017-01-10","kind":"sale","acquired":false,"shares":1200000,"price":19,"value":22800000.0,"ownership":{"direct":false,"nature":"By affiliate"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Following the transaction reported herein, CD&R Allied Holdings, L.P. (\"CD&R Holdings\") directly owns 40,810,377 shares of Common Stock. CD&R Associates VIII, Ltd., as the general partner of CD&R Holdings, CD&R Associates VIII, L.P., as the sole stockholder of CD&R Associates VIII, Ltd., and CD&R Investment Associates VIII, Ltd., as the general partner of CD&R Associates VIII, L.P., may each be deemed to beneficially own the shares of Common Stock held by CD&R Holdings."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Each of CD&R Associates VIII, Ltd., CD&R Associates VIII, L.P. and CD&R Investment Associates VIII, Ltd. expressly disclaims beneficial ownership of the shares of Common Stock held by CD&R Holdings, except to the extent of its pecuniary interest therein."}],"balance_after":40810377,"source":{"system":"sec-edgar","filing":"0001209191-17-003200","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1674087/000120919117003200/doc4.xml","form_type":"4"}},{"id":4524001,"issuer":{"id":4197,"kind":"organization","name":"Atkore Inc."},"owners":[{"id":166480,"kind":"organization","name":"CD&R Allied Holdings, L.P.","position":1,"cik":"0001674087","reported_name":"CD&R Allied Holdings, L.P.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166481,"kind":"organization","name":"CD&R Associates VIII, Ltd.","position":2,"cik":"0001474786","reported_name":"CD&R Associates VIII, Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166482,"kind":"organization","name":"CD&R ASSOCIATES VIII, LP","position":3,"cik":"0001474716","reported_name":"CD&R ASSOCIATES VIII, LP","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}},{"id":166483,"kind":"organization","name":"CD&R Investment Associates VIII, Ltd.","position":4,"cik":"0001474785","reported_name":"CD&R Investment Associates VIII, Ltd.","relationship":{"director":false,"officer":false,"ten_percent_owner":true,"other":false}}],"security":"Common Stock","published_at":"2016-12-13T16:38:01.000Z","date":"2016-12-13","kind":"sale","acquired":false,"shares":8000000,"price":19,"value":152000000.0,"ownership":{"direct":false,"nature":"By affiliate"},"footnotes":[{"field":"ownership.nature","element":"natureOfOwnership","label":"F1","text":"Following the transaction reported herein, CD&R Allied Holdings, L.P. (\"CD&R Holdings\") directly owns 42,010,377 shares of Common Stock. CD&R Associates VIII, Ltd., as the general partner of CD&R Holdings, CD&R Associates VIII, L.P., as the sole stockholder of CD&R Associates VIII, Ltd., and CD&R Investment Associates VIII, Ltd., as the general partner of CD&R Associates VIII, L.P., may each be deemed to beneficially own the shares of Common Stock held by CD&R Holdings."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"Each of CD&R Associates VIII, Ltd., CD&R Associates VIII, L.P. and CD&R Investment Associates VIII, Ltd. expressly disclaims beneficial ownership of the shares of Common Stock held by CD&R Holdings, except to the extent of its pecuniary interest therein."}],"balance_after":42010377,"source":{"system":"sec-edgar","filing":"0001209191-16-154919","document":"doc4.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1674087/000120919116154919/doc4.xml","form_type":"4"}}]}