ONE Gas, Inc.

OGS·NYSE·$81.74Share Price as of 11/2·$5BMarket Cap as of 11/2

Financials

10-QQ2 ended 06/30/2608/05/26 10-QQ1 ended 03/31/2605/05/26 10-KFY 202502/19/26 10-QQ3 ended 09/30/2511/04/25 10-QQ2 ended 06/30/2508/06/25

Disclosures

8-KCurrent report09/29/26 8-KCurrent report09/25/26 8-KCurrent report09/08/26 8-KCurrent report08/13/26 8-KCurrent report08/04/26

Prospectuses and Registrations

424B5Prospectus supplement08/12/26 424B5Prospectus supplement08/11/26 FWPFree writing prospectus08/11/26 S-8Registration of securities for employees05/22/26 424B5Prospectus supplement02/24/26

Proxies

DEFA14AAdditional proxy materials05/01/26 DEF 14ADefinitive proxy04/01/26 DEFA14AAdditional proxy materials05/01/25 DEF 14ADefinitive proxy04/02/25 DEFA14AAdditional proxy materials05/01/24

Ownership

Form 4Insider transaction08/13/26 Form 3Initial insider ownership07/23/26 Form 4Insider transaction06/10/26 Form 4Insider transaction06/04/26 Form 4Insider transaction06/04/26

Other

11-KEmployee stock purchase plan report06/25/26 ARSAnnual report to shareholders04/01/26 8-A12B8-A12B11/10/25 CERTCEO/CFO certification11/10/25 11-KEmployee stock purchase plan report06/26/25