Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
343 institutional managers reported holding NOG for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 68%. 71 opened new positions; 41 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 15.72M | 15.96% | $459.5M | added +7.9% | ≤2013 |
| Vanguard Group | 11.91M | 12.09% | $348.2M | added +9.4% | ≤2013 |
| American Century Companies INC | 7.97M | 8.10% | $233.1M | trimmed -5.1% | 2022 Q4 |
| State Street | 6.54M | 6.64% | $191.2M | added +26.2% | ≤2013 |
| FMR (Fidelity) | 6.39M | 6.49% | $186.8M | trimmed -2.5% | 2018 Q3 |
| Invesco | 5.51M | 5.60% | $161.2M | added +26.4% | 2019 Q1 |
| Dimensional Fund Advisors | 4.15M | 4.21% | $121.2M | trimmed -2.3% | 2022 Q2 |
| AllianceBernstein | 3.43M | 3.49% | $100.4M | trimmed -3% | 2021 Q2 |
| UBS | 2.73M | 2.78% | $80.0M | added +11.7% | ≤2013 |
| Geode Capital | 2.44M | 2.48% | $71.4M | added +6.3% | ≤2013 |
| Morgan Stanley | 2.40M | 2.43% | $70.1M | added +6% | ≤2013 |
| Nuveen | 1.73M | 1.76% | $50.7M | added +31.7% | 2021 Q2 |
| Charles Schwab Investment Management | 1.68M | 1.71% | $49.2M | added +16% | 2018 Q2 |
| Hood River Capital Management LLC | 1.59M | 1.61% | $46.4M | added +24.9% | 2022 Q2 |
| BNY Mellon | 1.46M | 1.48% | $42.7M | trimmed -0.6% | ≤2013 |
| Goldman Sachs | 1.39M | 1.42% | $40.8M | added +73.8% | ≤2013 |
| Nomura Asset Management International INC. | 1.37M | 1.39% | $40.1M | trimmed -4.9% | 2022 Q4 |
| Voya Investment Management LLC | 1.32M | 1.34% | $38.5M | added +37.1% | 2021 Q2 |
| Bank OF America CORP /DE/ | 1.25M | 1.26% | $36.4M | added +18.5% | ≤2013 |
| Westwood Holdings Group INC | 1.22M | 1.24% | $35.8M | trimmed -63% | 2021 Q4 |
| Deprince Race & Zollo INC | 1.17M | 1.19% | $34.2M | trimmed -1.5% | 2025 Q4 |
| First Trust Advisors LP | 1.17M | 1.19% | $34.1M | added +116.8% | 2022 Q2 |
| Northern Trust | 1.02M | 1.04% | $29.9M | added +6.4% | ≤2013 |
| Kennedy Capital Management LLC | 928.9k | 0.94% | $27.2M | added +5.1% | 2021 Q1 |
| Tributary Capital Management, LLC | 830.4k | 0.84% | $24.3M | trimmed -0.9% | 2022 Q2 |
| NEW York State Common Retirement Fund | 824.6k | 0.84% | $24.1M | added +10.5% | 2021 Q2 |
| Royal Bank OF Canada | 812.3k | 0.82% | $23.7M | trimmed -2.7% | ≤2013 |
| Palisade Capital Management, LP | 778.1k | 0.79% | $22.7M | trimmed -1.7% | 2023 Q2 |
| Raymond James Financial INC | 737.3k | 0.75% | $21.6M | added +21.8% | 2021 Q1 |
| Wells Fargo & COMPANY/MN | 693.6k | 0.70% | $20.3M | added +4.3% | ≤2013 |
| Silvercrest Asset Management Group LLC | 640.3k | 0.65% | $18.7M | added +13.3% | 2022 Q2 |
| Citigroup INC | 613.8k | 0.62% | $17.9M | added +17.4% | ≤2013 |
| Bridgeway Capital Management, LLC | 598.2k | 0.61% | $17.5M | added +3.1% | 2025 Q3 |
| Requisite Capital Management, LLC | 565.5k | 0.57% | $16.5M | unchanged | 2022 Q1 |
| Penn Capital Management Company, LLC | 560.6k | 0.57% | $16.4M | added +13.3% | 2021 Q4 |
| Millennium Management | 538.2k | 0.55% | $15.7M | trimmed -61.9% | 2015 Q3 |
| Principal Financial Group INC | 506.7k | 0.51% | $14.8M | added +9.5% | 2022 Q2 |
| Victory Capital Management INC | 491.8k | 0.50% | $14.4M | trimmed -15.8% | 2019 Q3 |
| Allspring Global Investments Holdings, LLC | 467.5k | 0.47% | $13.7M | trimmed -64% | 2021 Q4 |
| Mutual OF America Capital Management LLC | 460.2k | 0.47% | $13.5M | unchanged | 2021 Q2 |
| SEI Investments CO | 450.3k | 0.46% | $13.2M | added +12.7% | 2021 Q1 |
| MetLife Investment Management, LLC | 415.3k | 0.42% | $12.1M | added +670.7% | 2021 Q2 |
| Empowered Funds, LLC | 403.1k | 0.41% | $11.8M | added +5.3% | 2023 Q3 |
| Hotchkis & Wiley Capital Management LLC | 388.5k | 0.39% | $11.4M | trimmed -32.2% | 2021 Q1 |
| Public Sector Pension Investment Board | 373.3k | 0.38% | $10.9M | added +10.9% | 2023 Q1 |
| Envestnet Asset Management INC | 340.5k | 0.35% | $10.0M | added +48.8% | 2021 Q2 |
| Barclays PLC | 327.3k | 0.33% | $9.6M | trimmed -28.5% | 2022 Q1 |
| Russell Investments Group, LTD. | 319.8k | 0.33% | $9.3M | added +12.9% | 2018 Q2 |
| Deutsche Bank AG\ | 312.5k | 0.32% | $9.1M | added +3% | ≤2013 |
| Lord, Abbett & CO. LLC | 306.2k | 0.31% | $9.0M | added +105.6% | 2023 Q4 |
Largest 50 of 343 shown; the full ranked, searchable register is at boothcheck.com/holders/NOG. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.