Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
448 institutional managers reported holding RBRK for the quarter ended Mar 31, 2026. Together they hold about 58% of shares outstanding; the top 10 hold 29%. 101 opened new positions; 119 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 15.78M | 7.95% | $772.2M | added +7.3% | 2024 Q2 |
| BlackRock | 8.82M | 4.44% | $431.5M | trimmed -24.7% | 2024 Q2 |
| FMR (Fidelity) | 8.26M | 4.16% | $404.4M | added +56.7% | 2024 Q2 |
| First Trust Advisors LP | 4.90M | 2.47% | $239.6M | trimmed -30.7% | 2024 Q2 |
| Voya Investment Management LLC | 3.74M | 1.88% | $182.9M | trimmed -2.4% | 2024 Q2 |
| PointState Capital LP (focused) | 3.65M | 1.84% | $178.5M | added +73.6% | 2024 Q3 |
| Pictet Asset Management Holding SA | 3.33M | 1.68% | $162.8M | added +104.1% | 2024 Q2 |
| UBS | 2.81M | 1.42% | $137.5M | added +88.3% | 2024 Q2 |
| Geode Capital | 2.70M | 1.36% | $132.3M | added +6.9% | 2024 Q2 |
| State Street | 2.57M | 1.29% | $125.6M | added +8.9% | 2024 Q2 |
| Two Sigma | 2.31M | 1.17% | $113.2M | added +223% | 2024 Q2 |
| AQR Capital | 2.22M | 1.12% | $108.5M | added +105% | 2025 Q3 |
| Legal & General Group PLC | 1.82M | 0.92% | $89.2M | trimmed -4.3% | 2024 Q2 |
| Morgan Stanley | 1.72M | 0.87% | $84.3M | added +38.6% | 2024 Q2 |
| Penserra Capital Management LLC | 1.54M | 0.78% | $75.3M | added +18.8% | 2024 Q3 |
| Clearbridge Investments, LLC | 1.45M | 0.73% | $70.9M | added +6.2% | 2024 Q2 |
| Institutional Venture Management XV, LLC (focused) | 1.43M | 0.72% | $70.1M | unchanged | 2024 Q2 |
| BNP Paribas Financial Markets | 1.43M | 0.72% | $69.9M | added +19.5% | 2024 Q3 |
| Federated Hermes, INC. | 1.32M | 0.66% | $64.5M | trimmed -46.2% | 2024 Q3 |
| Champlain Investment Partners, LLC | 1.26M | 0.64% | $61.7M | opened | 2026 Q1 |
| Wells Fargo & COMPANY/MN | 1.18M | 0.59% | $57.8M | added +203.7% | 2024 Q2 |
| SG Americas Securities, LLC | 1.17M | 0.59% | $57.3M | added +1284.7% | 2024 Q3 |
| Charles Schwab Investment Management | 1.16M | 0.58% | $56.6M | added +12% | 2024 Q2 |
| Bank OF America CORP /DE/ | 1.02M | 0.52% | $50.0M | trimmed -10.5% | 2024 Q2 |
| Greenvale Capital LLP (focused) | 1.02M | 0.51% | $49.9M | opened | 2026 Q1 |
| Susquehanna International Group | 905.7k | 0.46% | $44.3M | trimmed -16% | 2024 Q2 |
| T. Rowe Price | 887.6k | 0.45% | $43.4M | added +59.5% | 2024 Q3 |
| AllianceBernstein | 872.6k | 0.44% | $42.7M | added +7.3% | 2024 Q2 |
| Squarepoint Ops LLC | 817.0k | 0.41% | $40.0M | trimmed -4.8% | 2024 Q2 |
| Fiera Capital CORP | 797.8k | 0.40% | $39.0M | added +2.6% | 2025 Q1 |
| Northern Trust | 755.2k | 0.38% | $37.0M | added +7.8% | 2024 Q2 |
| Mirae Asset Global Etfs Holdings LTD. | 736.4k | 0.37% | $36.0M | added +7.1% | 2025 Q2 |
| Qube Research & Technologies LTD | 733.4k | 0.37% | $35.9M | added +99.2% | 2024 Q2 |
| Citadel Advisors | 731.2k | 0.37% | $35.8M | added +27% | 2024 Q2 |
| Goldman Sachs | 728.6k | 0.37% | $35.7M | trimmed -15.7% | 2024 Q3 |
| Bank OF Nova Scotia | 726.7k | 0.37% | $35.6M | trimmed -1.5% | 2025 Q3 |
| Stephens Investment Management Group LLC | 699.4k | 0.35% | $34.2M | added +17.4% | 2024 Q2 |
| IEQ Capital, LLC | 689.8k | 0.35% | $33.8M | trimmed -4.8% | 2024 Q3 |
| Capital Group (American Funds) | 663.7k | 0.34% | $32.5M | opened | 2026 Q1 |
| Bain Capital Venture Investors, LLC (focused) | 659.6k | 0.33% | $32.3M | unchanged | 2024 Q2 |
| Capital International Investors | 618.1k | 0.31% | $30.3M | trimmed -51.8% | 2024 Q2 |
| Atreides Management, LP | 566.5k | 0.29% | $27.7M | trimmed -36.7% | 2025 Q2 |
| Amundi | 561.5k | 0.28% | $27.5M | added +449.5% | 2024 Q4 |
| BNY Mellon | 557.5k | 0.28% | $27.3M | unchanged | 2024 Q3 |
| Holocene Advisors | 555.7k | 0.28% | $27.2M | added +5.9% | 2025 Q2 |
| Congress Asset Management CO | 545.7k | 0.28% | $26.7M | opened | 2026 Q1 |
| Alkeon Capital Management LLC | 500.0k | 0.25% | $24.5M | trimmed -16.7% | 2024 Q4 |
| Wellington Management | 491.7k | 0.25% | $24.1M | added +31.6% | 2025 Q3 |
| Bienville Capital Management, LLC | 471.7k | 0.24% | $23.1M | added +62.7% | 2024 Q2 |
| Barclays PLC | 457.6k | 0.23% | $22.4M | added +34.7% | 2024 Q2 |
Largest 50 of 448 shown; the full ranked, searchable register is at boothcheck.com/holders/RBRK. 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.