ATKR

SEC source: 0001666138-18-000050 · wf-form4_152633998883782.xml · nonDerivative · entry 1

Williamson John Patrick · CIK 0001674890 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 237,107

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001666138-18-000042 · wf-form4_152546815926070.xml · nonDerivative · entry 1

SCHROCK MICHAEL V · CIK 0001189053 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 4,532

F1 · security: Reflects the award of restricted stock units, which are scheduled to vest based on continued service as a Director on the earlier of (a) the day immediately preceding the first anniversary of the grant date and (b) the day immediately preceding the Atkore International Group Inc. annual meeting of stockholders next following the grant date.

SEC source: 0001666138-18-000033 · wf-form4_152106733996193.xml · derivative · entry 3

Williamson John Patrick · CIK 0001674890 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 263,300

Underlying: Common Stock · 4,700 shares

Expires 2021-06-10

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_date: These options are fully vested and exercisable.

SEC source: 0001666138-18-000033 · wf-form4_152106733996193.xml · nonDerivative · entry 2

Williamson John Patrick · CIK 0001674890 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 193,112

F1 · kind: This exercise and sale were undertaken pursuant to a predetermined diversification plan previously adopted by the Reporting Person (a "10b5-1 Plan").

SEC source: 0001666138-18-000033 · wf-form4_152106733996193.xml · nonDerivative · entry 1

Williamson John Patrick · CIK 0001674890 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 196,872

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001666138-18-000031 · wf-form4_151995151203350.xml · derivative · entry 3

MALLAK JAMES A · CIK 0001276299 · Vice President and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 87,700 shares

Expires 2022-12-07

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: These options are fully vested and exercisable.

SEC source: 0001666138-18-000031 · wf-form4_151995151203350.xml · nonDerivative · entry 2

MALLAK JAMES A · CIK 0001276299 · Vice President and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 77,623

F1 · kind: This exercise and sale were undertaken pursuant to a predetermined diversification plan previously adopted by the Reporting Person (a "10b5-1 Plan").

F2 · price: This price represents the approximate weighted average price per share of common stock (each a "Share") of Atkore International Group Inc. (the "Issuer") of sales that were executed at prices ranging from $21.19 to $22.1899 per Share. The Reporting Person undertakes to provide, upon request by the Securities and Exchange Commission staff, the Issuer or a security holder of the issuer, full information regarding the number of Shares sold at each price.

SEC source: 0001666138-18-000031 · wf-form4_151995151203350.xml · nonDerivative · entry 1

MALLAK JAMES A · CIK 0001276299 · Vice President and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 165,323

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001209191-18-011395 · doc4.xml · nonDerivative · entry 1

CD&R Allied Holdings, L.P. · CIK 0001674087 · 10% owner

CD&R Associates VIII, Ltd. · CIK 0001474786 · 10% owner

CD&R ASSOCIATES VIII, LP · CIK 0001474716 · 10% owner

CD&R Investment Associates VIII, Ltd. · CIK 0001474785 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By affiliate

Disclosed balance after: 6,334,838

F1 · ownership.nature: 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.

F2 · ownership.nature: 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.

SEC source: 0001209191-18-031419 · doc4a.xml · nonDerivative · entry 1

CD&R Allied Holdings, L.P. · CIK 0001674087 · 10% owner

CD&R Associates VIII, Ltd. · CIK 0001474786 · 10% owner

CD&R ASSOCIATES VIII, LP · CIK 0001474716 · 10% owner

CD&R Investment Associates VIII, Ltd. · CIK 0001474785 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By affiliate

Disclosed balance after: 7,234,838

F1 · ownership.nature: 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.

F2 · ownership.nature: 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.

SEC source: 0001209191-18-010545 · doc4.xml · nonDerivative · entry 1

CD&R Allied Holdings, L.P. · CIK 0001674087 · 10% owner

CD&R Associates VIII, Ltd. · CIK 0001474786 · 10% owner

CD&R ASSOCIATES VIII, LP · CIK 0001474716 · 10% owner

CD&R Investment Associates VIII, Ltd. · CIK 0001474785 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By affiliate

Disclosed balance after: 13,027,763

F1 · kind: 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.

F2 · ownership.nature: 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.

F3 · ownership.nature: 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.

SEC source: 0001209191-18-010546 · doc4.xml · nonDerivative · entry 2

Sleeper Nathan K · CIK 0001380855 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 0

F1 · kind: On February 14, 2018, 47,654 shares of Common Stock directly owned by CD&R Allied Holdings, L.P. were distributed to the Reporting Person, who is a limited partner of CD&R Associates VIII, L.P., the sole stockholder of the general partner of CD&R Allied Holdings, L.P., in connection with a charitable gift made by the Reporting Person on February 14, 2018 exempt under Rule 16b-5.

SEC source: 0001209191-18-010546 · doc4.xml · nonDerivative · entry 1

Sleeper Nathan K · CIK 0001380855 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 47,654

F1 · kind: On February 14, 2018, 47,654 shares of Common Stock directly owned by CD&R Allied Holdings, L.P. were distributed to the Reporting Person, who is a limited partner of CD&R Associates VIII, L.P., the sole stockholder of the general partner of CD&R Allied Holdings, L.P., in connection with a charitable gift made by the Reporting Person on February 14, 2018 exempt under Rule 16b-5.

SEC source: 0001209191-18-007845 · doc4.xml · nonDerivative · entry 1

CD&R Allied Holdings, L.P. · CIK 0001674087 · 10% owner

CD&R Associates VIII, Ltd. · CIK 0001474786 · 10% owner

CD&R ASSOCIATES VIII, LP · CIK 0001474716 · 10% owner

CD&R Investment Associates VIII, Ltd. · CIK 0001474785 · 10% owner

Joint disclosure: these amounts are not allocated separately to each reporting owner.

10b5-1 filing: Not disclosed

Ownership: Indirect · By affiliate

Disclosed balance after: 13,234,838

F1 · ownership.nature: 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.

F2 · ownership.nature: 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.

SEC source: 0001666138-18-000022 · wf-form4_151752624649604.xml · nonDerivative · entry 1

VanArsdale William · CIK 0001674326 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,242

F1 · security: Reflects the award of restricted stock units ("RSUs") granted to Director on January 31, 2018. These RSUs are scheduled to vest based on continued service as a Director on the earlier of (a) the day immediately preceding the first anniversary of the grant date and (b) the day immediately preceding the Atkore International Group Inc. annual meeting of stockholders next following the grant date.

SEC source: 0001666138-18-000021 · wf-form4_151752622701942.xml · nonDerivative · entry 1

Zeffiro A Mark · CIK 0001446066 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,590

F1 · security: Reflects the award of restricted stock units ("RSUs") granted to Director on January 31, 2018. These RSUs are scheduled to vest based on continued service as a Director on the earlier of (a) the day immediately preceding the first anniversary of the grant date and (b) the day immediately preceding the Atkore International Group Inc. annual meeting of stockholders next following the grant date.

SEC source: 0001666138-18-000020 · wf-form4_151752619923202.xml · nonDerivative · entry 1

Isbell Jeri L · CIK 0001218799 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,242

F1 · security: Reflects the award of restricted stock units ("RSUs") granted to Director on January 31, 2018. These RSUs are scheduled to vest based on continued service as a Director on the earlier of (a) the day immediately preceding the first anniversary of the grant date and (b) the day immediately preceding the Atkore International Group Inc. annual meeting of stockholders next following the grant date.

SEC source: 0001666138-18-000019 · wf-form4_151752618096924.xml · nonDerivative · entry 1

Kershaw Justin A · CIK 0001713397 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,403

F1 · security: Reflects the award of restricted stock units ("RSUs") granted to Director on January 31, 2018. These RSUs are scheduled to vest based on continued service as a Director on the earlier of (a) the day immediately preceding the first anniversary of the grant date and (b) the day immediately preceding the Atkore International Group Inc. annual meeting of stockholders next following the grant date.

SEC source: 0001666138-18-000018 · wf-form4_151752616180213.xml · nonDerivative · entry 1

MUSE SCOTT H · CIK 0001224118 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,242

F1 · security: Reflects the award of restricted stock units ("RSUs") granted to Director on January 31, 2018. These RSUs are scheduled to vest based on continued service as a Director on the earlier of (a) the day immediately preceding the first anniversary of the grant date and (b) the day immediately preceding the Atkore International Group Inc. annual meeting of stockholders next following the grant date.

SEC source: 0001666138-18-000017 · wf-form4_151752614265617.xml · nonDerivative · entry 1

James Wilbert W Jr · CIK 0001713395 · Director

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,403

F1 · security: Reflects the award of restricted stock units ("RSUs") granted to Director on January 31, 2018. These RSUs are scheduled to vest based on continued service as a Director on the earlier of (a) the day immediately preceding the first anniversary of the grant date and (b) the day immediately preceding the Atkore International Group Inc. annual meeting of stockholders next following the grant date.

SEC source: 0001666138-17-000140 · wf-form4_151337368655627.xml · derivative · entry 3

Williamson John Patrick · CIK 0001674890 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 408,000

Underlying: Common Stock · 70,000 shares

Expires 2021-06-10

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F3 · derivative.exercise_date: These options are fully vested and exercisable.

SEC source: 0001666138-17-000140 · wf-form4_151337368655627.xml · nonDerivative · entry 2

Williamson John Patrick · CIK 0001674890 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 192,172

F1 · kind: This exercise and sale were undertaken pursuant to a predetermined diversification plan previously adopted by the Reporting Person (a "10b5-1 Plan").

F2 · price: This price represents the approximate weighted average price per share of common stock (each a "Share") of Atkore International Group Inc. (the "Issuer") of sales that were executed at prices ranging from $20.50 to $20.94 per Share. The Reporting Person undertakes to provide, upon request by the Securities and Exchange Commission staff, the Issuer or a security holder of the issuer, full information regarding the number of Shares sold at each price.

SEC source: 0001666138-17-000140 · wf-form4_151337368655627.xml · nonDerivative · entry 1

Williamson John Patrick · CIK 0001674890 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 262,172

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001666138-17-000116 · wf-form4_151208364394714.xml · derivative · entry 8

Fitzpatrick Kevin P · CIK 0001454306 · VP, Global Human Resources

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 132,894

Underlying: Common Stock · 2,709 shares

Expires 2022-12-07

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F6 · derivative.exercise_date: These options are fully vested and exercisable.

SEC source: 0001666138-17-000116 · wf-form4_151208364394714.xml · nonDerivative · entry 5

Fitzpatrick Kevin P · CIK 0001454306 · VP, Global Human Resources

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 58,223

F2 · kind: This exercise and sale were undertaken pursuant to a predetermined diversification plan previously adopted by the Reporting Person (a "10b5-1 Plan").

F4 · price: This price represents the approximate weighted average price per share of common stock (each a "Share") of Atkore International Group Inc. (the "Issuer") of sales that were executed at prices ranging from $22.00 to $22.32 per Share. The Reporting Person undertakes to provide, upon request by the Securities and Exchange Commission staff, the Issuer or a security holder of the issuer, full information regarding the number of Shares sold at each price.

SEC source: 0001666138-17-000116 · wf-form4_151208364394714.xml · nonDerivative · entry 4

Fitzpatrick Kevin P · CIK 0001454306 · VP, Global Human Resources

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 60,932

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001666138-17-000137 · wf-form4_151320423257433.xml · nonDerivative · entry 1

Lariviere Peter J · CIK 0001674832 · VP & Pres., Cable Solutions

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 89,242

SEC source: 0001666138-17-000132 · wf-form4_151320414223016.xml · nonDerivative · entry 1

Williamson John Patrick · CIK 0001674890 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 192,172

SEC source: 0001666138-17-000138 · wf-form4_151320425044021.xml · nonDerivative · entry 1

Waltz William E Jr. · CIK 0001674332 · VP & Grp Pres., Elec. Raceway

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 95,243

SEC source: 0001666138-17-000134 · wf-form4_151320417700232.xml · nonDerivative · entry 1

Kelly Daniel S · CIK 0001674314 · VP, General Counsel and Sec.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,001

SEC source: 0001666138-17-000135 · wf-form4_151320419787880.xml · nonDerivative · entry 1

Schulte Michael J · CIK 0001674316 · VP & Grp. Pres, MP&S

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 125,383

SEC source: 0001666138-17-000136 · wf-form4_151320421615703.xml · nonDerivative · entry 1

Fitzpatrick Kevin P · CIK 0001454306 · VP, Global Human Resources

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 57,688

SEC source: 0001666138-17-000133 · wf-form4_151320415885189.xml · nonDerivative · entry 1

MALLAK JAMES A · CIK 0001276299 · Vice President and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 77,623

SEC source: 0001666138-17-000121 · wf-form4_151208373393412.xml · derivative · entry 8

MALLAK JAMES A · CIK 0001276299 · Vice President and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 87,700

Underlying: Common Stock · 38,033 shares

Expires 2022-12-07

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F5 · derivative.exercise_date: These options are fully vested and exercisable.

SEC source: 0001666138-17-000121 · wf-form4_151208373393412.xml · nonDerivative · entry 5

MALLAK JAMES A · CIK 0001276299 · Vice President and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 78,235

F1 · kind: This exercise and sale were undertaken pursuant to a predetermined diversification plan previously adopted by the Reporting Person (a "10b5-1 Plan").

F4 · price: This price represents the approximate weighted average price per share of common stock (each a "Share") of Atkore International Group Inc. (the "Issuer") of sales that were executed at prices ranging from $20.29 to $21.24 per Share. The Reporting Person undertakes to provide, upon request by the Securities and Exchange Commission staff, the Issuer or a security holder of the issuer, full information regarding the number of Shares sold at each price.

SEC source: 0001666138-17-000121 · wf-form4_151208373393412.xml · nonDerivative · entry 4

MALLAK JAMES A · CIK 0001276299 · Vice President and CFO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 116,268

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001666138-17-000116 · wf-form4_151208364394714.xml · derivative · entry 7

Fitzpatrick Kevin P · CIK 0001454306 · VP, Global Human Resources

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 135,603

Underlying: Common Stock · 152,097 shares

Expires 2022-12-07

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F6 · derivative.exercise_date: These options are fully vested and exercisable.

SEC source: 0001666138-17-000116 · wf-form4_151208364394714.xml · nonDerivative · entry 3

Fitzpatrick Kevin P · CIK 0001454306 · VP, Global Human Resources

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 58,223

F2 · kind: This exercise and sale were undertaken pursuant to a predetermined diversification plan previously adopted by the Reporting Person (a "10b5-1 Plan").

F3 · price: This price represents the approximate weighted average price per share of common stock (each a "Share") of Atkore International Group Inc. (the "Issuer") of sales that were executed at prices ranging from $22.00 to $22.48 per Share. The Reporting Person undertakes to provide, upon request by the Securities and Exchange Commission staff, the Issuer or a security holder of the issuer, full information regarding the number of Shares sold at each price.

SEC source: 0001666138-17-000116 · wf-form4_151208364394714.xml · nonDerivative · entry 2

Fitzpatrick Kevin P · CIK 0001454306 · VP, Global Human Resources

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 210,320

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001666138-17-000118 · wf-form4_151208368016344.xml · derivative · entry 2

Lariviere Peter J · CIK 0001674832 · VP & Pres., Cable Solutions

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 15,456

Underlying: Common Stock · 15,456 shares

Expires 2027-11-28

F2 · derivative.exercise_date: Represents stock options. The options vest and become exercisable ratably in three installments on each anniversary of November 28, 2017, subject to continued employment.

SEC source: 0001666138-17-000118 · wf-form4_151208368016344.xml · nonDerivative · entry 1

Lariviere Peter J · CIK 0001674832 · VP & Pres., Cable Solutions

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 90,043

F1 · security: Represents restricted stock units ("RSUs"). The RSUs vest ratably in three installments on each anniversary of November 28, 2017, subject to continued employment. The RSUs settle into common stock of the Issuer no later than March 15th of the calendar year immediately following the calendar year in which vesting occurs.

SEC source: 0001666138-17-000122 · wf-form4_151208375089456.xml · derivative · entry 5

Williamson John Patrick · CIK 0001674890 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 73,529

Underlying: Common Stock · 73,529 shares

Expires 2027-11-28

F5 · derivative.exercise_date: Represents stock options. The options vest and become exercisable ratably in three installments on each anniversary of November 28, 2017, subject to continued employment.

SEC source: 0001666138-17-000122 · wf-form4_151208375089456.xml · derivative · entry 4

Williamson John Patrick · CIK 0001674890 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 478,000

Underlying: Common Stock · 5,352 shares

Expires 2021-06-10

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F4 · derivative.exercise_date: These options are fully vested and exercisable.

SEC source: 0001666138-17-000122 · wf-form4_151208375089456.xml · nonDerivative · entry 3

Williamson John Patrick · CIK 0001674890 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 196,165

F3 · security: Represents restricted stock units ("RSUs"). The RSUs vest ratably in three installments on each anniversary of November 28, 2017, subject to continued employment. The RSUs settle into common stock of the Issuer no later than March 15th of the calendar year immediately following the calendar year in which vesting occurs.

SEC source: 0001666138-17-000122 · wf-form4_151208375089456.xml · nonDerivative · entry 2

Williamson John Patrick · CIK 0001674890 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 165,555

F1 · kind: This exercise and sale were undertaken pursuant to a predetermined diversification plan previously adopted by the Reporting Person (a "10b5-1 Plan").

F2 · price: This price represents the approximate weighted average price per share of common stock (each a "Share") of Atkore International Group Inc. (the "Issuer") of sales that were executed at prices ranging from $20.00 to $20.01 per Share. The Reporting Person undertakes to provide, upon request by the Securities and Exchange Commission staff, the Issuer or a security holder of the issuer, full information regarding the number of Shares sold at each price.

SEC source: 0001666138-17-000122 · wf-form4_151208375089456.xml · nonDerivative · entry 1

Williamson John Patrick · CIK 0001674890 · Director · President and CEO

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 170,907

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

SEC source: 0001666138-17-000117 · wf-form4_151208366325051.xml · derivative · entry 2

Waltz William E Jr. · CIK 0001674332 · VP & Grp Pres., Elec. Raceway

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 18,007

Underlying: Common Stock · 18,007 shares

Expires 2027-11-28

F2 · derivative.exercise_date: Represents stock options. The options vest and become exercisable ratably in three installments on each anniversary of November 28, 2017, subject to continued employment.

SEC source: 0001666138-17-000117 · wf-form4_151208366325051.xml · nonDerivative · entry 1

Waltz William E Jr. · CIK 0001674332 · VP & Grp Pres., Elec. Raceway

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 96,044

F1 · security: Represents restricted stock units ("RSUs"). The RSUs vest ratably in three installments on each anniversary of November 30, 2016, subject to continued employment. The RSUs settle into common stock of the Issuer no later than March 15th of the calendar year immediately following the calendar year in which vesting occurs.

SEC source: 0001666138-17-000120 · wf-form4_151208371679420.xml · derivative · entry 2

Kelly Daniel S · CIK 0001674314 · VP, General Counsel and Sec.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 10,504

Underlying: Common Stock · 10,504 shares

Expires 2027-11-28

F2 · derivative.exercise_date: Represents stock options. The options vest and become exercisable ratably in three installments on each anniversary of November 28, 2017, subject to continued employment

SEC source: 0001666138-17-000120 · wf-form4_151208371679420.xml · nonDerivative · entry 1

Kelly Daniel S · CIK 0001674314 · VP, General Counsel and Sec.

10b5-1 filing: Not disclosed

Ownership: Direct

Disclosed balance after: 8,370

F1 · security: Represents restricted stock units ("RSUs"). The RSUs vest ratably in three installments on each anniversary of November 28, 2017, subject to continued employment. The RSUs settle into common stock of the Issuer no later than March 15th of the calendar year immediately following the calendar year in which vesting occurs.