SEC ownership of ONE Gas, Inc.

Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001587732.

Holder evidence

Lead holder

BlackRock, Inc.

13D/G signal

BlackRock, Inc.

Latest evidence

21 May 2026

Top shareholders Insider holders Latest transactions

CIK: 0001587732
Symbol: OGS on NYSE
Location: Tulsa, OK
SEC evidence mix: 13F, 13D/G, and 3/4/5
Lead holder: BlackRock, Inc.
Latest large-stake holder: BlackRock, Inc.
Latest evidence date: 21 May 2026

Ownership snapshot

Top shareholders of ONE Gas, Inc. (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Lead holder

BlackRock, Inc.

13D/G signal

BlackRock, Inc.

Evidence rows

Latest as of

21 May 2026

13F 13D/G 3/4/5 Lead comparable stake: 13% 13D/G row: BlackRock, Inc. Showing 1-8 of 50 holder rows.

Rank 1 holder

BlackRock, Inc.

13F 13D/G

Ownership: 13%
Position: $785.08M

13F 13D/G

Rank 2 holder

VANGUARD PORTFOLIO MANAGEMENT LLC

13D/G 13F

Ownership: 5.8%
Position: $311.19M

13D/G 13F

Rank 3 holder

AMERICAN CENTURY INVESTMENT MANAGEMENT INC

13D/G

Ownership: 5.4%
Position: $290.72M

13D/G

Holder	Evidence	Ownership %	Position	12M Net Δ	As of
BlackRock, Inc.	13F 13D/G Company 13F 13D/G	13% from 13D/G	$785,081,496 9,115,076 shares	—	31 Mar 2026
VANGUARD PORTFOLIO MANAGEMENT LLC	13D/G 13F Vanguard Portfolio Management · Company 13D/G 13F	5.8%	$311,190,102 3,613,028 shares	$0	31 Mar 2026
AMERICAN CENTURY INVESTMENT MANAGEMENT INC	13D/G 13D/G	5.4%	$290,722,599 3,375,393 shares	-$51,421,246	31 Mar 2026
VANGUARD CAPITAL MANAGEMENT LLC	13D/G 13F Vanguard Capital Management · Company 13D/G 13F	5.2%	$280,731,519 3,259,393 shares	$0	31 Mar 2026
STATE STREET CORP	13F 13D/G Company · STATE STREET CORPORATION 13F 13D/G	5% from 13D/G	$261,566,905 3,036,885 shares	—	31 Mar 2026
WELLINGTON MANAGEMENT GROUP LLP	13D/G 13F Company 13D/G 13F	4.2%	$224,397,245 2,605,332 shares	$0	31 Mar 2026
Michael G. Hutchinson	3/4/5 Director 3/4/5	0.03%	$1,406,589 16,331 shares	-$236,574	21 May 2026
Tracy E. Hart	3/4/5 Director 3/4/5	0.02%	$973,441 11,302 shares	—	21 May 2026

How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

Forms 3/4/5 flow

Insider trading overview

Net insider flow leans to selling over the last 12 months. Net value: -$396,403.

Buys

Insiders: 0

Sells

$396,403

Insiders: 3

Net

-$396,403

Shares: -4,850

Window

Last 12 months

4 rolling buckets

Buy value Sell value

Shares: 0 Shares: 4,850

Window (months)	Sell shares	Buy value	Sell value	Net value
0-3	850	$0	$73,389	-$73,389
3-6	4,000	$0	$323,014	-$323,014
6-9	0	$0	$0	$0
9-12	0	$0	$0	$0

Reporting owners

Insider holders from Forms 3/4/5

Showing 1-20 of 22 reporting-owner rows connected to ONE Gas, Inc.. Open a relationship link for the CIK-to-CIK filing trail.

Rows

Lead holder

Pierce H. Norton II

Net 12M change

-$396,403

Latest report

21 May 2026

Name	Relationship	Holdings Value	Past Year Net Change	Change %	Valuation	Report Date
Pierce H. Norton II	Retired Director, President and Chief Executive Officer	$21,052,466			Mixed	27 Dec 2021
Curtis L. Dinan	Senior Vice President and Chief Operating Officer	$14,463,917			Mixed	14 Feb 2026
Robert S. McAnnally	President and Chief Executive Officer, Director	$11,271,943			Mixed	14 Feb 2026
Caron A. Lawhorn	Retired Senior Vice President and Chief Financial Officer	$9,017,536			Mixed	28 Jun 2024
Joseph L. McCormick	Former Senior Vice President, General Counsel and Assistant Secretary	$7,297,736			Mixed	16 Feb 2026
Pattye L. Moore	Director	$3,851,757			Mixed	21 May 2026
Mark A. Bender	Senior Vice President, Administration and Chief Information Officer	$3,156,103			Mixed	14 Feb 2026
Douglas H. Yaeger	Director	$2,143,181			Mixed	25 May 2023
Christopher P. Sighinolfi	Senior Vice President and Chief Financial Officer	$1,937,387			Mixed	14 Feb 2026
John W. Gibson	Director	$1,831,003			Mixed	22 May 2025
William K. Shortridge	Senior Vice President, Operations and Customer Service	$1,674,680			Mixed	14 Feb 2026
Eduardo A. Rodriguez	Director	$1,605,719	-$73,389	-4.4%	Mixed	21 May 2026
Michael G. Hutchinson	Director	$1,406,589	-$236,574	-14%	Median	21 May 2026
Robert B. Evans	Director	$1,347,081			Mixed	25 May 2023
Tracy E. Hart	Director	$973,441			Median	21 May 2026
Angela E. Kouplen	Senior Vice President and Chief Human Resources Officer	$764,743			Mixed	14 Feb 2026
Jeffrey J. Husen	Vice President, Chief Accounting Officer and Controller	$706,832			Mixed	21 Feb 2022
Regina L. Gregory	Senior Vice President, General Counsel and Assistant Secretary	$549,967			Mixed	16 Feb 2026
Brian F. Brumfield	Vice President, Chief Accounting Officer and Controller	$472,730	-$86,440	-15%	Mixed	24 Feb 2026
Sanjay D. Meshri	Director	$455,886			Median	21 May 2026

Recent insider transactions for ONE Gas, Inc.

Showing up to 300 most recent insider transactions from the last 12 months.

Insider	Symbol	Class	Transaction	%	Reported value	Reported price	Shares	Shares owned	Date	Ownership
Sanjay D. Meshri	OGS	Common stock, par value $0.01	Award	47.3%			1,700	5,293	21 May 2026	Direct
Pattye L. Moore	OGS	Deferred Stock	Award	3.14%			1,700	55,877	21 May 2026	Direct
Deborah Hersman	OGS	Deferred Stock	Award	29.1%			1,700	7,533	21 May 2026	Direct
Eduardo A. Rodriguez	OGS	Common stock, par value $0.01	Award	9.54%			1,275	14,637	21 May 2026	Direct
Eduardo A. Rodriguez	OGS	Deferred Stock	Award	8.76%			425	5,276	21 May 2026	Direct
Michael G. Hutchinson	OGS	Common stock, par value $0.01	Award	11.6%			1,700	16,331	21 May 2026	Direct
Yves C. Siegel	OGS	Deferred Stock	Award	45.4%			1,700	5,447	21 May 2026	Direct
Tracy E. Hart	OGS	Common stock, par value $0.01	Award	17.7%			1,700	11,302	21 May 2026	Direct
Eduardo A. Rodriguez	OGS	Common stock, par value $0.01	Sale	-5.98%	$73,389	$86.34	-850	13,362	06 Mar 2026	Direct
Brian F. Brumfield	OGS	Common stock, par value $0.01	Sale	-30.8%	$86,440	$86.44	-1,000	2,246	24 Feb 2026	Direct
William K. Shortridge	OGS	Common stock, par value $0.01	Tax liability	-6.73%			-816	11,300	16 Feb 2026	Direct
William K. Shortridge	OGS	Common stock, par value $0.01	Options Exercise	15.9%			1,660	12,116	16 Feb 2026	Direct
William K. Shortridge	OGS	Restricted Units 2026	Award				1,395	1,395	16 Feb 2026	Direct
William K. Shortridge	OGS	Performance Units 2026	Award				2,092	2,092	16 Feb 2026	Direct
William K. Shortridge	OGS	Performance Units 2023	Options Exercise	-100%			-1,956	0	16 Feb 2026	Direct
Joseph L. McCormick	OGS	Common stock, par value $0.01	Tax liability	-2.1%			-1,608	74,907	16 Feb 2026	Direct
Joseph L. McCormick	OGS	Common stock, par value $0.01	Options Exercise	5.23%			3,804	76,515	16 Feb 2026	Direct
Joseph L. McCormick	OGS	Performance Units 2023	Options Exercise	-100%			-4,891	0	16 Feb 2026	Direct
Christopher P. Sighinolfi	OGS	Common stock, par value $0.01	Tax liability	-1.47%			-61.53	4,125	16 Feb 2026	Direct
Christopher P. Sighinolfi	OGS	Common stock, par value $0.01	Options Exercise	48.2%			1,362	4,186	16 Feb 2026	Direct
Christopher P. Sighinolfi	OGS	Restricted Units 2026	Award				3,719	3,719	16 Feb 2026	Direct
Christopher P. Sighinolfi	OGS	Performance Units 2026	Award				5,579	5,579	16 Feb 2026	Direct
Christopher P. Sighinolfi	OGS	Performance Units 2023	Options Exercise	-100%			-1,605	0	16 Feb 2026	Direct
Angela E. Kouplen	OGS	Common stock, par value $0.01	Tax liability	-41%			-1,000	1,439	16 Feb 2026	Direct
Angela E. Kouplen	OGS	Common stock, par value $0.01	Options Exercise	851.6%			2,183	2,439	16 Feb 2026	Direct
Angela E. Kouplen	OGS	Restricted Units 2026	Award				1,534	1,534	16 Feb 2026	Direct
Angela E. Kouplen	OGS	Performance Units 2026	Award				2,301	2,301	16 Feb 2026	Direct
Angela E. Kouplen	OGS	Performance Units 2023	Options Exercise	-100%			-2,639	0	16 Feb 2026	Direct
Brian F. Brumfield	OGS	Common stock, par value $0.01	Tax liability	-13.2%			-438	2,870	16 Feb 2026	Direct
Brian F. Brumfield	OGS	Common stock, par value $0.01	Options Exercise	63.4%			1,284	3,309	16 Feb 2026	Direct
Brian F. Brumfield	OGS	Restricted Units 2026	Award				959	959	16 Feb 2026	Direct
Brian F. Brumfield	OGS	Performance Units 2026	Award				959	959	16 Feb 2026	Direct
Brian F. Brumfield	OGS	Performance Units 2023	Options Exercise	-100%			-1,513	0	16 Feb 2026	Direct
Regina L. Gregory	OGS	Restricted Units 2026	Award				2,557	2,557	16 Feb 2026	Direct
Regina L. Gregory	OGS	Performance Units 2026	Award				3,835	3,835	16 Feb 2026	Direct
Mark A. Bender	OGS	Common stock, par value $0.01	Tax liability	-4.25%			-1,268	28,582	16 Feb 2026	Direct
Mark A. Bender	OGS	Common stock, par value $0.01	Options Exercise	9.93%			2,697	29,851	16 Feb 2026	Direct
Mark A. Bender	OGS	Restricted Units 2026	Award				1,534	1,534	16 Feb 2026	Direct
Mark A. Bender	OGS	Performance Units 2026	Award				2,301	2,301	16 Feb 2026	Direct
Mark A. Bender	OGS	Performance Units 2023	Options Exercise	-100%			-3,179	0	16 Feb 2026	Direct
Curtis L. Dinan	OGS	Common stock, par value $0.01	Tax liability	-1.7%			-2,438	141,263	16 Feb 2026	Direct
Curtis L. Dinan	OGS	Common stock, par value $0.01	Options Exercise	3.9%			5,395	143,701	16 Feb 2026	Direct
Curtis L. Dinan	OGS	Restricted Units 2026	Award				4,649	4,649	16 Feb 2026	Direct
Curtis L. Dinan	OGS	Performance Units 2026	Award				6,974	6,974	16 Feb 2026	Direct
Curtis L. Dinan	OGS	Performance Units 2023	Options Exercise	-100%			-6,358	0	16 Feb 2026	Direct
Robert S. McAnnally	OGS	Common stock, par value $0.01	Tax liability	-13.1%			-8,410	56,005	16 Feb 2026	Direct
Robert S. McAnnally	OGS	Common stock, par value $0.01	Options Exercise	42.1%			19,088	64,415	16 Feb 2026	Direct
Robert S. McAnnally	OGS	Restricted Units 2026	Award				11,158	11,158	16 Feb 2026	Direct
Robert S. McAnnally	OGS	Performance Units 2026	Award				26,034	26,034	16 Feb 2026	Direct
Robert S. McAnnally	OGS	Performance Units 2023	Options Exercise	-100%			-22,497	0	16 Feb 2026	Direct

^* indicates a reported price that failed the local validity check.