ATKORE INC

Ticker: ATKR CUSIP: 047649108 Class: Common Stock

GILDER GAGNON HOWE & CO LLC's Holding History (CIK: 0000902464)

Note: Option positions (PUT/CALL) are excluded.

Q3 2017

Shares 16,905 Value ($000) $330 Avg Close $18.51 Range $14.52 - $22.60

Q2 2017

Shares 99,485 Value ($000) $2,243 Avg Close $22.71 Range $19.91 - $25.85

Q1 2017

Shares 249,266 Value ($000) $6,551 Avg Close $24.84 Range $22.15 - $26.33

Q4 2016

Shares 176,219 Value ($000) $4,213 Avg Close $19.83 Range $17.36 - $23.48

Period	Shares	Value ($000)	Average Close	Price Range
Q3 2017	16,905	$330	$18.51	$14.52 - $22.60
Q2 2017	99,485	$2,243	$22.71	$19.91 - $25.85
Q1 2017	249,266	$6,551	$24.84	$22.15 - $26.33
Q4 2016	176,219	$4,213	$19.83	$17.36 - $23.48