Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
253 institutional managers reported holding ATEN for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 52%. 51 opened new positions; 37 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 13.09M | 17.95% | $302.6M | added +0.8% | 2014 Q2 |
| Vanguard Group | 7.11M | 9.75% | $164.4M | trimmed -1.8% | 2014 Q2 |
| Penserra Capital Management LLC | 3.59M | 4.93% | $83.1M | trimmed -15.6% | 2024 Q4 |
| State Street | 3.09M | 4.24% | $71.4M | trimmed -0.8% | 2015 Q4 |
| Boston Trust Walden CORP | 2.17M | 2.98% | $50.2M | trimmed -11% | 2025 Q1 |
| Wellington Management | 2.07M | 2.85% | $48.0M | added +2.7% | 2024 Q4 |
| Barclays PLC | 1.87M | 2.57% | $43.3M | added +1.8% | 2014 Q2 |
| Renaissance Technologies | 1.78M | 2.45% | $41.3M | trimmed -16.4% | 2014 Q4 |
| First Trust Advisors LP | 1.72M | 2.36% | $39.8M | trimmed -30.2% | 2019 Q1 |
| Geode Capital | 1.72M | 2.35% | $39.7M | trimmed -3.4% | 2014 Q2 |
| Dimensional Fund Advisors | 1.64M | 2.24% | $37.8M | trimmed -0.8% | 2018 Q4 |
| Mirae Asset Global Etfs Holdings LTD. | 1.58M | 2.17% | $36.6M | added +7.5% | 2019 Q1 |
| Arrowstreet Capital | 1.50M | 2.05% | $34.6M | added +36.7% | 2024 Q1 |
| Punch & Associates Investment Management, INC. | 1.46M | 2.00% | $33.8M | added +1.7% | 2022 Q1 |
| Two Sigma | 1.32M | 1.81% | $30.5M | added +79.9% | 2015 Q4 |
| Goldman Sachs | 1.19M | 1.63% | $27.4M | added +14.7% | 2014 Q2 |
| T. Rowe Price | 1.07M | 1.47% | $24.8M | trimmed -30.2% | 2022 Q3 |
| Prudential Financial INC | 885.2k | 1.21% | $20.5M | added +1105.9% | 2018 Q3 |
| Royce & Associates | 817.4k | 1.12% | $18.9M | added +12.4% | 2014 Q4 |
| Boston Partners | 815.8k | 1.12% | $18.9M | trimmed -2.9% | 2025 Q4 |
| Morgan Stanley | 813.1k | 1.11% | $18.8M | added +1.1% | 2014 Q2 |
| Charles Schwab Investment Management | 744.0k | 1.02% | $17.2M | added +2.1% | 2014 Q2 |
| Northern Trust | 704.4k | 0.97% | $16.3M | added +2.4% | 2014 Q2 |
| BNY Mellon | 660.6k | 0.91% | $15.3M | trimmed -0.8% | 2014 Q2 |
| Jane Street | 595.9k | 0.82% | $13.8M | opened | 2022 Q4 |
| Deprince Race & Zollo INC | 564.8k | 0.78% | $13.1M | opened | 2026 Q1 |
| UBS | 551.6k | 0.76% | $12.8M | trimmed -2.8% | 2014 Q2 |
| Royal Bank OF Canada | 536.5k | 0.74% | $12.4M | added +9899.3% | 2014 Q2 |
| Citadel Advisors | 514.0k | 0.70% | $11.9M | added +238.1% | 2014 Q1 |
| Oberweis Asset Management INC/ | 504.3k | 0.69% | $11.7M | opened | 2026 Q1 |
| Impax Asset Management Group plc | 470.0k | 0.65% | $10.9M | added +30.6% | 2022 Q1 |
| Aptus Capital Advisors, LLC | 455.0k | 0.62% | $10.5M | added +1% | 2025 Q1 |
| Principal Financial Group INC | 436.3k | 0.60% | $10.1M | trimmed -3.5% | 2020 Q2 |
| Defiance ETFs, LLC | 423.1k | 0.58% | $9.8M | trimmed -24.5% | 2025 Q4 |
| Millennium Management | 414.9k | 0.57% | $9.6M | added +95.7% | 2024 Q2 |
| BNP Paribas Financial Markets | 401.8k | 0.55% | $9.3M | added +80.7% | 2014 Q3 |
| Paradigm Capital Management INC/NY | 401.4k | 0.55% | $9.3M | unchanged | 2015 Q3 |
| Bridge City Capital, LLC | 400.7k | 0.55% | $9.3M | added +5.6% | 2021 Q1 |
| Russell Investments Group, LTD. | 389.8k | 0.54% | $9.0M | added +1064.4% | 2016 Q4 |
| Invesco | 362.7k | 0.50% | $8.4M | trimmed -56.6% | 2016 Q2 |
| Rice Hall James & Associates, LLC | 336.8k | 0.46% | $7.8M | added +6.4% | 2021 Q2 |
| Wells Fargo & COMPANY/MN | 332.5k | 0.46% | $7.7M | added +29.8% | 2014 Q2 |
| Crawford Investment Counsel INC | 320.6k | 0.44% | $7.4M | added +5.8% | 2025 Q3 |
| HRT Financial LP | 320.4k | 0.44% | $7.4M | opened | 2025 Q3 |
| Man Group | 304.4k | 0.42% | $7.0M | added +60% | 2020 Q2 |
| Jump Financial | 287.5k | 0.39% | $6.6M | opened | 2026 Q1 |
| D. E. Shaw | 263.4k | 0.36% | $6.1M | opened | 2025 Q2 |
| Public Sector Pension Investment Board | 255.8k | 0.35% | $5.9M | added +3.1% | 2022 Q2 |
| Tudor Investment | 238.9k | 0.33% | $5.5M | trimmed -35.5% | 2024 Q2 |
| NEW York State Common Retirement Fund | 235.7k | 0.32% | $5.5M | added +140.9% | 2015 Q2 |
Largest 50 of 253 shown; the full ranked, searchable register is at boothcheck.com/holders/ATEN. 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.