There is a long list of 64 institutional holders of NGS 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 NGS by largest to smallest position reported in the institutional investor's latest 13F filing. In the institutional-holders-of-NGS table below, the initial column indicates the name of each top institutional holder of NGS, with a link to that fund's top holdings. The next columns indicate the amount of NGS stock held by each of the institutional holders of NGS, followed by the NGS 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
Mill Road Capital Management LLC	921,508	$14,818	12/31/2023
NGS	921,508	$14,818	12/31/2023
Dimensional Fund Advisors LP	891,342	$14,333	12/31/2023
NGS	891,342	$14,333	12/31/2023
Aegis Financial Corp	854,695	$13,743	12/31/2023
NGS	854,695	$13,743	12/31/2023
AWM Investment Company Inc.	769,233	$12,369	12/31/2023
NGS	769,233	$12,369	12/31/2023
Pacific Ridge Capital Partners LLC	620,298	$9,974	12/31/2023
NGS	620,298	$9,974	12/31/2023
Ameriprise Financial Inc.	535,751	$8,615	12/31/2023
NGS	535,751	$8,615	12/31/2023
Vanguard Group Inc.	485,038	$7,799	12/31/2023
NGS	485,038	$7,799	12/31/2023
Renaissance Technologies LLC	482,343	$7,756	12/31/2023
NGS	482,343	$7,756	12/31/2023
BlackRock Inc.	371,785	$5,978	12/31/2023
NGS	371,785	$5,978	12/31/2023
Royce & Associates LP	358,643	$5,767	12/31/2023
NGS	358,643	$5,767	12/31/2023
Bridgeway Capital Management Inc.	246,432	$3,963	12/31/2023
NGS	246,432	$3,963	12/31/2023
Acuitas Investments LLC	200,200	$3,219	12/31/2023
NGS	200,200	$3,219	12/31/2023
RBF Capital LLC	140,000	$2,251	12/31/2023
NGS	140,000	$2,251	12/31/2023
Russell Investments Group Ltd.	130,122	$2,092	12/31/2023
NGS	130,122	$2,092	12/31/2023
Geode Capital Management LLC	91,302	$1,469	12/31/2023
NGS	91,302	$1,469	12/31/2023
Susquehanna International Group LLP	83,912	$1,349	12/31/2023
NGS	83,912	$1,349	12/31/2023
Empowered Funds LLC	72,578	$1,167	12/31/2023
NGS	72,578	$1,167	12/31/2023
Millennium Management LLC	58,102	$934	12/31/2023
NGS	58,102	$934	12/31/2023
White Pine Capital LLC	50,666	$815	12/31/2023
NGS	50,666	$815	12/31/2023
Assenagon Asset Management S.A.	48,573	$781	12/31/2023
NGS	48,573	$781	12/31/2023
American Century Companies Inc.	43,602	$701	12/31/2023
NGS	43,602	$701	12/31/2023
Morgan Stanley	43,248	$695	12/31/2023
NGS	43,248	$695	12/31/2023
Acadian Asset Management LLC	42,668	$685	12/31/2023
NGS	42,668	$685	12/31/2023
Bank of America Corp DE	38,392	$617	12/31/2023
NGS	38,392	$617	12/31/2023
Jane Street Group LLC	36,650	$589	12/31/2023
NGS	36,650	$589	12/31/2023
State Street Corp	36,352	$585	12/31/2023
NGS	36,352	$585	12/31/2023
Qube Research & Technologies Ltd	36,288	$584	12/31/2023
NGS	36,288	$584	12/31/2023
Citigroup Inc.	35,738	$575	12/31/2023
NGS	35,738	$575	12/31/2023
Ancora Advisors LLC	31,790	$511	12/31/2023
NGS	31,790	$511	12/31/2023
Northern Trust Corp	29,154	$469	12/31/2023
NGS	29,154	$469	12/31/2023
Boston Partners	28,622	$460	12/31/2023
NGS	28,622	$460	12/31/2023
Connor Clark & Lunn Investment Management Ltd.	28,410	$457	12/31/2023
NGS	28,410	$457	12/31/2023
Bank of New York Mellon Corp	28,043	$451	12/31/2023
NGS	28,043	$451	12/31/2023
Balyasny Asset Management LLC	25,524	$410	12/31/2023
NGS	25,524	$410	12/31/2023
Laurion Capital Management LP	25,425	$409	12/31/2023
NGS	25,425	$409	12/31/2023
Citadel Advisors LLC		$387	12/31/2023
Call	23,500	$378	12/31/2023
NGS	893	$14	12/31/2023
Put	300	$5	12/31/2023
Barclays PLC	22,536	$363	12/31/2023
NGS	22,536	$363	12/31/2023
Marshall Wace LLP	20,876	$336	12/31/2023
NGS	20,876	$336	12/31/2023
Man Group plc	18,387	$296	12/31/2023
NGS	18,387	$296	12/31/2023
Goldman Sachs Group Inc.	18,002	$289	12/31/2023
NGS	18,002	$289	12/31/2023
ExodusPoint Capital Management LP	17,879	$287	12/31/2023
NGS	17,879	$287	12/31/2023
Advisor Group Holdings Inc.	14,926	$240	12/31/2023
NGS	14,926	$240	12/31/2023
Corton Capital Inc.	14,898	$240	12/31/2023
NGS	14,898	$240	12/31/2023
JPMorgan Chase & Co.	14,604	$235	12/31/2023
NGS	14,604	$235	12/31/2023
683 Capital Management LLC	14,327	$230	12/31/2023
NGS	14,327	$230	12/31/2023
Aristides Capital LLC	10,895	$175	12/31/2023
NGS	10,895	$175	12/31/2023
Jump Financial LLC	10,880	$175	12/31/2023
NGS	10,880	$175	12/31/2023
Perritt Capital Management Inc.	10,000	$161	12/31/2023
NGS	10,000	$161	12/31/2023
Proficio Capital Partners LLC	10,000	$161	12/31/2023
NGS	10,000	$161	12/31/2023
Royal Bank of Canada	9,369	$151	12/31/2023
NGS	9,369	$151	12/31/2023