There is a long list of 328 institutional holders of OGS within the last two holding periods in our database of 13F filers, so we've sorted through to present to you just the top 50 institutional holders of OGS by largest to smallest position reported in the institutional investor's latest 13F filing. In the institutional-holders-of-OGS table below, the initial column indicates the name of each top institutional holder of OGS, with a link to that fund's top holdings. The next columns indicate the amount of OGS stock held by each of the institutional holders of OGS, followed by the OGS position size held by the institution, and finally the date of the quarterly 13F filing period the holdings data represents for that institution.

Holder	Amount	Position Size ($ in 1000's)	As of
BlackRock Inc.	8,049,655	$512,924	12/31/2023
OGS	8,049,655	$512,924	12/31/2023
Vanguard Group Inc.	6,412,557	$408,608	12/31/2023
OGS	6,412,557	$408,608	12/31/2023
American Century Companies Inc.	3,977,709	$253,460	12/31/2023
OGS	3,977,709	$253,460	12/31/2023
State Street Corp	3,183,957	$202,882	12/31/2023
OGS	3,183,957	$202,882	12/31/2023
T. Rowe Price Investment Management Inc.	2,122,359	$135,237	12/31/2023
OGS	2,122,359	$135,237	12/31/2023
Wellington Management Group LLP	1,555,206	$99,098	12/31/2023
OGS	1,555,206	$99,098	12/31/2023
Victory Capital Management Inc.	1,548,689	$98,682	12/31/2023
OGS	1,548,689	$98,682	12/31/2023
Geode Capital Management LLC	1,229,344	$78,343	12/31/2023
OGS	1,229,344	$78,343	12/31/2023
Morgan Stanley	1,224,856	$78,048	12/31/2023
OGS	1,224,856	$78,048	12/31/2023
First Trust Advisors LP	1,108,868	$70,657	12/31/2023
OGS	1,108,868	$70,657	12/31/2023
Boston Trust Walden Corp	1,003,954	$63,972	12/31/2023
OGS	1,003,954	$63,972	12/31/2023
Goldman Sachs Group Inc.	944,846	$60,206	12/31/2023
OGS	944,846	$60,206	12/31/2023
Silvercrest Asset Management Group LLC	845,123	$53,851	12/31/2023
OGS	845,123	$53,851	12/31/2023
JPMorgan Chase & Co.	830,732	$52,934	12/31/2023
OGS	830,732	$52,934	12/31/2023
Dimensional Fund Advisors LP	817,199	$52,073	12/31/2023
OGS	817,199	$52,073	12/31/2023
Bank of New York Mellon Corp	752,561	$47,953	12/31/2023
OGS	752,561	$47,953	12/31/2023
Northern Trust Corp	736,451	$46,927	12/31/2023
OGS	736,451	$46,927	12/31/2023
Energy Income Partners LLC	692,317	$44,114	12/31/2023
OGS	692,317	$44,114	12/31/2023
Massachusetts Financial Services Co. MA	686,068	$43,716	12/31/2023
OGS	686,068	$43,716	12/31/2023
Charles Schwab Investment Management Inc.	658,667	$41,970	12/31/2023
OGS	658,667	$41,970	12/31/2023
ProShare Advisors LLC	598,404	$38,130	12/31/2023
OGS	598,404	$38,130	12/31/2023
Duff & Phelps Investment Management Co.	576,000	$36,703	12/31/2023
OGS	576,000	$36,703	12/31/2023
Schroder Investment Management Group	547,994	$34,918	12/31/2023
OGS	547,994	$34,918	12/31/2023
Balyasny Asset Management LLC	483,766	$30,826	12/31/2023
OGS	483,766	$30,826	12/31/2023
Norges Bank	477,012	$30,395	12/31/2023
OGS	477,012	$30,395	12/31/2023
Nuveen Asset Management LLC	452,964	$28,863	12/31/2023
OGS	452,964	$28,863	12/31/2023
Jupiter Asset Management Ltd.	411,835	$26,242	12/31/2023
OGS	411,835	$26,242	12/31/2023
FMR LLC	401,853	$25,606	12/31/2023
OGS	401,853	$25,606	12/31/2023
Legal & General Group Plc	382,933	$24,400	12/31/2023
OGS	382,933	$24,400	12/31/2023
Standard Life Aberdeen plc	344,673	$21,963	12/31/2023
OGS	344,673	$21,963	12/31/2023
Invesco Ltd.	322,376	$20,542	12/31/2023
OGS	322,376	$20,542	12/31/2023
Ameriprise Financial Inc.	318,805	$20,314	12/31/2023
OGS	318,805	$20,314	12/31/2023
California Public Employees Retirement System	299,344	$19,074	12/31/2023
OGS	299,344	$19,074	12/31/2023
Royal Bank of Canada	295,832	$18,849	12/31/2023
OGS	295,832	$18,849	12/31/2023
AQR Capital Management LLC	247,079	$15,744	12/31/2023
OGS	247,079	$15,744	12/31/2023
Panagora Asset Management Inc.	239,508	$15,261	12/31/2023
OGS	239,508	$15,261	12/31/2023
Millennium Management LLC	212,946	$13,569	12/31/2023
OGS	212,946	$13,569	12/31/2023
Jacobs Levy Equity Management Inc.	211,570	$13,481	12/31/2023
OGS	211,570	$13,481	12/31/2023
Principal Financial Group Inc.	207,083	$13,195	12/31/2023
OGS	207,083	$13,195	12/31/2023
Rhumbline Advisers	201,233	$12,823	12/31/2023
OGS	201,233	$12,823	12/31/2023
Sei Investments Co.	200,439	$12,772	12/31/2023
OGS	200,439	$12,772	12/31/2023
Clearbridge Investments LLC	197,579	$12,590	12/31/2023
OGS	197,579	$12,590	12/31/2023
Citadel Advisors LLC		$12,433	12/31/2023
OGS	193,820	$12,350	12/31/2023
Call	6,700	$427	12/31/2023
Put	5,400	$344	12/31/2023
Gabelli Funds LLC	190,800	$12,158	12/31/2023
OGS	190,800	$12,158	12/31/2023
Janus Henderson Group PLC	184,914	$11,783	12/31/2023
OGS	184,914	$11,783	12/31/2023
Hotchkis & Wiley Capital Management LLC	179,680	$11,449	12/31/2023
OGS	179,680	$11,449	12/31/2023
Bank of America Corp DE	166,112	$10,585	12/31/2023
OGS	166,112	$10,585	12/31/2023
Retirement Systems of Alabama	156,453	$9,969	12/31/2023
OGS	156,453	$9,969	12/31/2023
BOKF NA	154,154	$9,823	12/31/2023
OGS	154,154	$9,823	12/31/2023
Barclays PLC	137,744	$8,777	12/31/2023
OGS	137,744	$8,777	12/31/2023