Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
102 institutional managers reported holding ARX for the quarter ended Mar 31, 2026. Together they hold about 24% of shares outstanding; the top 10 hold 16%. 27 opened new positions; 21 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Security Benefit Life Insurance CO /KS/ (focused) | 5.87M | 2.64% | $78.4M | unchanged | 2025 Q3 |
| Capital Group (American Funds) | 5.15M | 2.32% | $68.9M | trimmed -10.7% | 2025 Q3 |
| Vanguard Group | 4.14M | 1.86% | $55.3M | added +85.1% | 2025 Q3 |
| Keenan Capital, LLC (focused) | 3.99M | 1.80% | $53.4M | added +27.2% | 2025 Q4 |
| Gilder Gagnon Howe & CO LLC | 3.74M | 1.69% | $50.0M | added +1.1% | 2025 Q3 |
| American Century Companies INC | 3.19M | 1.44% | $42.6M | added +108.6% | 2025 Q3 |
| Barings LLC | 3.13M | 1.41% | $41.8M | unchanged | 2025 Q3 |
| AllianceBernstein | 2.80M | 1.26% | $37.4M | trimmed -1.6% | 2025 Q3 |
| Marshall Wace | 2.27M | 1.02% | $30.4M | added +553.2% | 2025 Q3 |
| Azora Capital LP (focused) | 1.98M | 0.89% | $26.5M | trimmed -18.8% | 2025 Q3 |
| Cresset Asset Management, LLC | 1.84M | 0.83% | $24.6M | opened | 2026 Q1 |
| FMR (Fidelity) | 1.81M | 0.82% | $24.2M | added +1.3% | 2025 Q3 |
| ArrowMark Colorado Holdings LLC | 1.55M | 0.70% | $20.7M | trimmed -5.8% | 2025 Q3 |
| Bamco INC /NY/ | 1.21M | 0.55% | $16.2M | unchanged | 2025 Q3 |
| Citadel Advisors | 1.14M | 0.52% | $15.3M | added +59.9% | 2025 Q3 |
| T. Rowe Price Investment Management, INC. | 975.9k | 0.44% | $13.0M | added +162.5% | 2025 Q3 |
| Qube Research & Technologies LTD | 930.9k | 0.42% | $12.4M | opened | 2025 Q3 |
| Jane Street | 860.7k | 0.39% | $11.5M | opened | 2025 Q3 |
| UBS | 768.3k | 0.35% | $10.3M | added +29.1% | 2025 Q3 |
| Susquehanna International Group | 708.0k | 0.32% | $9.5M | opened | 2026 Q1 |
| G2 Investment Partners Management LLC | 372.8k | 0.17% | $5.0M | added +299.4% | 2025 Q4 |
| Woodline Partners LP | 367.2k | 0.17% | $4.9M | added +86.1% | 2025 Q3 |
| BNP Paribas Financial Markets | 305.2k | 0.14% | $4.1M | added +753.2% | 2025 Q4 |
| Morgan Stanley | 287.2k | 0.13% | $3.8M | added +165.3% | 2025 Q3 |
| Renaissance Technologies | 276.6k | 0.13% | $3.7M | added +280.5% | 2025 Q4 |
| XTX Topco LTD | 237.7k | 0.11% | $3.2M | added +123.7% | 2025 Q3 |
| Squarepoint Ops LLC | 212.8k | 0.10% | $2.8M | added +6.9% | 2025 Q3 |
| Owls Nest Partners IA, LLC (focused) | 209.7k | 0.09% | $2.8M | opened | 2026 Q1 |
| Seven Grand Managers, LLC | 200.0k | 0.09% | $2.7M | unchanged | 2025 Q3 |
| Bank OF America CORP /DE/ | 180.2k | 0.08% | $2.4M | trimmed -46.3% | 2025 Q3 |
| Point72 | 166.7k | 0.07% | $2.2M | opened | 2025 Q3 |
| BlackRock | 165.6k | 0.07% | $2.2M | trimmed -33.1% | 2025 Q3 |
| Cannell Capital LLC (focused) | 156.1k | 0.07% | $2.1M | opened | 2026 Q1 |
| Militia Capital Management LLC | 150.0k | 0.07% | $2.0M | first filing | 2026 Q1 |
| Trexquant Investment LP | 149.1k | 0.07% | $2.0M | opened | 2026 Q1 |
| Robertson Opportunity Capital, LLC (focused) | 135.0k | 0.06% | $1.8M | opened | 2026 Q1 |
| Millennium Management | 125.1k | 0.06% | $1.7M | trimmed -31.1% | 2025 Q3 |
| Schonfeld Strategic Advisors | 113.8k | 0.05% | $1.5M | added +98.9% | 2025 Q3 |
| Burkehill Global Management, LP | 100.0k | 0.04% | $1.3M | unchanged | 2025 Q3 |
| Jain Global LLC | 86.4k | 0.04% | $1.2M | added +72% | 2025 Q3 |
| Lighthouse Investment Partners, LLC | 85.4k | 0.04% | $1.1M | trimmed -57.1% | 2025 Q3 |
| Boothbay Fund Management, LLC | 78.7k | 0.04% | $1.1M | added +202.6% | 2025 Q4 |
| Swiss National Bank | 77.9k | 0.04% | $1.0M | unchanged | 2025 Q4 |
| Tiger Global | 75.0k | 0.03% | $1.0M | unchanged | 2025 Q3 |
| SEI Investments CO | 73.9k | 0.03% | $989k | added +95.1% | 2025 Q3 |
| SummitTX Capital, L.p. | 63.0k | 0.03% | $842k | added +11% | 2025 Q3 |
| Hudson Bay Capital | 55.3k | 0.03% | $739k | added +71.4% | 2025 Q3 |
| Brevan Howard Capital Management LP | 54.4k | 0.03% | $728k | opened | 2026 Q1 |
| State OF Wisconsin Investment Board | 53.5k | 0.02% | $715k | added +111.6% | 2025 Q4 |
| Interval Partners, LP | 49.5k | 0.02% | $662k | trimmed -70.8% | 2025 Q3 |
Largest 50 of 102 shown; the full ranked, searchable register is at boothcheck.com/holders/ARX. 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.