SCHEDULE 13G/A

ONE Gas Inc

Common Stock · CUSIP: 68235P108

Event date: 2025-03-31

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• American Century Capital Portfolios, Inc.

  Shares: 2,617,238.00 · Class: 4.4%

• American Century Investment Management, Inc.

  Shares: 3,972,412.00 · Class: 6.6%

• American Century Companies, Inc.

  Shares: 3,972,412.00 · Class: 6.6%

• Stowers Institute for Medical Research

  Shares: 3,972,412.00 · Class: 6.6%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.