ONE GAS INC

Ticker: OGS CUSIP: 68235P108 Class: COM

Robeco Institutional Asset Management B.V.'s Holding History (CIK: 0001418773)

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

Q4 2017

Shares 65,474 Value ($000) $4,797 Avg Close $75.81 Range $70.66 - $79.51

Q2 2014

Shares 26,422 Value ($000) $997 Avg Close $36.58 Range $34.90 - $38.91

Q1 2014

Shares 20,985 Value ($000) $754 Avg Close $34.23 Range $31.94 - $37.01

Period	Shares	Value ($000)	Average Close	Price Range
Q4 2017	65,474	$4,797	$75.81	$70.66 - $79.51
Q2 2014	26,422	$997	$36.58	$34.90 - $38.91
Q1 2014	20,985	$754	$34.23	$31.94 - $37.01