Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
385 institutional managers reported holding AAON for the quarter ended Mar 31, 2026. Together they hold about 83% of shares outstanding; the top 10 hold 41%. 52 opened new positions; 58 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Wellington Management | 7.98M | 9.59% | $660.1M | added +16.6% | 2024 Q4 |
| BlackRock | 6.56M | 7.89% | $542.9M | added +2.6% | ≤2013 |
| Vanguard Group | 6.56M | 7.88% | $542.6M | added +2.4% | ≤2013 |
| Wasatch Advisors LP | 2.27M | 2.73% | $187.7M | added +23.8% | 2017 Q1 |
| State Street | 2.06M | 2.48% | $170.7M | added +0.9% | 2015 Q4 |
| First Trust Advisors LP | 2.01M | 2.42% | $166.6M | added +22.1% | 2016 Q1 |
| Geneva Capital Management LLC | 1.72M | 2.07% | $142.5M | trimmed -6.9% | 2020 Q1 |
| Blair William & CO/IL | 1.62M | 1.95% | $134.2M | trimmed -3.4% | 2024 Q2 |
| Champlain Investment Partners, LLC | 1.60M | 1.93% | $132.6M | trimmed -3.8% | 2025 Q2 |
| Impax Asset Management Group plc | 1.44M | 1.73% | $118.9M | added +2.3% | 2024 Q2 |
| Geode Capital | 1.43M | 1.72% | $118.1M | added +3.3% | ≤2013 |
| Dimensional Fund Advisors | 1.38M | 1.67% | $114.6M | trimmed -1.7% | ≤2013 |
| Conestoga Capital Advisors, LLC | 1.27M | 1.53% | $105.1M | trimmed -28.5% | ≤2013 |
| Capital Group (American Funds) | 1.26M | 1.52% | $104.6M | added +117.7% | 2025 Q3 |
| Morgan Stanley | 1.25M | 1.51% | $103.8M | trimmed -25.7% | ≤2013 |
| Franklin Resources | 1.22M | 1.47% | $100.9M | unchanged | 2024 Q1 |
| Kayne Anderson Rudnick Investment Management LLC | 1.06M | 1.28% | $88.1M | trimmed -13.6% | ≤2013 |
| Spyglass Capital Management LLC (focused) | 858.8k | 1.03% | $71.1M | trimmed -28.4% | 2025 Q1 |
| Mawer Investment Management LTD. | 848.6k | 1.02% | $70.2M | added +10.8% | 2025 Q1 |
| Bamco INC /NY/ | 844.4k | 1.01% | $69.9M | added +14.4% | 2025 Q3 |
| Copeland Capital Management, LLC | 787.6k | 0.95% | $65.2M | trimmed -1.5% | 2025 Q3 |
| Ameriprise Financial INC | 787.0k | 0.95% | $65.1M | trimmed -39.4% | ≤2013 |
| Northern Trust | 743.5k | 0.89% | $61.5M | trimmed -1.1% | ≤2013 |
| FMR (Fidelity) | 736.0k | 0.89% | $60.9M | trimmed -42.1% | 2018 Q3 |
| Charles Schwab Investment Management | 729.2k | 0.88% | $60.3M | added +4.6% | ≤2013 |
| Bokf, NA | 681.7k | 0.82% | $56.4M | unchanged | 2014 Q3 |
| Brown Advisory INC | 672.8k | 0.81% | $55.7M | trimmed -14.3% | 2025 Q1 |
| Pictet Asset Management Holding SA | 671.2k | 0.81% | $55.5M | trimmed -23.7% | 2022 Q4 |
| Stephens Investment Management Group LLC | 634.1k | 0.76% | $52.5M | unchanged | 2024 Q2 |
| UBS | 612.7k | 0.74% | $50.7M | trimmed -8% | ≤2013 |
| Federated Hermes, INC. | 477.0k | 0.57% | $39.5M | trimmed -12.9% | 2024 Q2 |
| Royce & Associates | 472.5k | 0.57% | $39.1M | added +1.1% | 2025 Q1 |
| BNY Mellon | 442.5k | 0.53% | $36.6M | trimmed -2.4% | ≤2013 |
| Pembroke Management, LTD | 430.1k | 0.52% | $35.6M | trimmed -21.4% | 2024 Q2 |
| SEI Investments CO | 418.1k | 0.50% | $34.6M | trimmed -8.4% | 2014 Q4 |
| Amundi | 402.2k | 0.48% | $33.3M | trimmed -8.5% | 2022 Q3 |
| Grantham, Mayo, Van Otterloo & CO. LLC | 390.2k | 0.47% | $32.3M | added +15.6% | 2022 Q3 |
| Citadel Advisors | 375.4k | 0.45% | $31.1M | trimmed -4.2% | 2015 Q4 |
| Bank OF America CORP /DE/ | 352.7k | 0.42% | $29.2M | trimmed -17.8% | ≤2013 |
| Envestnet Asset Management INC | 324.5k | 0.39% | $26.8M | added +20.4% | 2015 Q3 |
| Senvest Management, LLC (focused) | 310.7k | 0.37% | $25.7M | added +63.9% | 2025 Q3 |
| Riverbridge Partners LLC | 302.4k | 0.36% | $25.0M | trimmed -14.7% | 2025 Q3 |
| Freestone Grove Partners LP | 291.9k | 0.35% | $24.2M | added +8008.2% | 2025 Q2 |
| ArrowMark Colorado Holdings LLC | 280.2k | 0.34% | $23.2M | added +35.6% | 2025 Q4 |
| Two Sigma | 280.0k | 0.34% | $23.2M | added +1141.4% | 2025 Q1 |
| American Capital Management INC | 276.9k | 0.33% | $22.9M | added +1.9% | 2025 Q3 |
| Raymond James Financial INC | 266.8k | 0.32% | $22.1M | trimmed -4.1% | 2014 Q4 |
| Ranger Investment Management, L.p. | 257.4k | 0.31% | $21.3M | trimmed -38.8% | 2024 Q2 |
| WCM Investment Management | 255.8k | 0.31% | $21.2M | trimmed -3.5% | 2025 Q1 |
| Wells Fargo & COMPANY/MN | 252.9k | 0.30% | $20.9M | trimmed -7.7% | ≤2013 |
Largest 50 of 385 shown; the full ranked, searchable register is at boothcheck.com/holders/AAON. 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.