Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
307 institutional managers reported holding DORM for the quarter ended Mar 31, 2026. Together they hold about 85% of shares outstanding; the top 10 hold 46%. 38 opened new positions; 71 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 4.01M | 13.17% | $418.7M | added +0.7% | ≤2013 |
| Vanguard Group | 2.98M | 9.80% | $311.5M | unchanged | ≤2013 |
| Morgan Stanley | 1.42M | 4.65% | $147.9M | added +4.7% | ≤2013 |
| Dimensional Fund Advisors | 1.10M | 3.61% | $114.9M | added +4.9% | ≤2013 |
| State Street | 1.10M | 3.61% | $114.9M | added +3.5% | ≤2013 |
| Jennison Associates LLC | 826.3k | 2.72% | $86.3M | added +1.5% | 2023 Q3 |
| Geode Capital | 713.2k | 2.34% | $74.5M | unchanged | ≤2013 |
| Invesco | 635.5k | 2.09% | $66.4M | trimmed -16.8% | ≤2013 |
| Royce & Associates | 616.7k | 2.03% | $64.4M | added +23.6% | ≤2013 |
| Geneva Capital Management LLC | 564.4k | 1.85% | $59.0M | added +39.2% | 2020 Q1 |
| Gw&k Investment Management, LLC | 513.7k | 1.69% | $53.7M | trimmed -3% | 2014 Q2 |
| Ameriprise Financial INC | 472.7k | 1.55% | $49.4M | added +25.2% | ≤2013 |
| Wellington Management | 461.6k | 1.52% | $48.2M | trimmed -9.1% | 2023 Q4 |
| Westfield Capital Management CO LP | 461.3k | 1.52% | $48.2M | unchanged | 2025 Q4 |
| Fiera Capital CORP | 442.9k | 1.46% | $46.3M | added +2.7% | 2024 Q3 |
| Northern Trust | 425.0k | 1.40% | $44.4M | unchanged | ≤2013 |
| T. Rowe Price Investment Management, INC. | 421.7k | 1.39% | $44.1M | added +186.2% | 2022 Q3 |
| Bank OF America CORP /DE/ | 410.0k | 1.35% | $42.8M | added +11.6% | ≤2013 |
| Victory Capital Management INC | 398.1k | 1.31% | $41.6M | added +8.7% | 2015 Q2 |
| T. Rowe Price | 332.4k | 1.09% | $34.7M | trimmed -35% | ≤2013 |
| Charles Schwab Investment Management | 330.4k | 1.09% | $34.5M | added +1.9% | ≤2013 |
| Fuller & Thaler Asset Management, INC. | 307.9k | 1.01% | $32.2M | trimmed -65.1% | 2024 Q4 |
| Silvercrest Asset Management Group LLC | 283.0k | 0.93% | $29.6M | trimmed -14.9% | 2025 Q1 |
| Mawer Investment Management LTD. | 255.2k | 0.84% | $26.7M | added +179.7% | 2025 Q4 |
| Southernsun Asset Management, LLC (focused) | 246.5k | 0.81% | $25.8M | added +29.4% | 2020 Q1 |
| Bragg Financial Advisors, INC | 242.3k | 0.80% | $25.3M | opened | 2026 Q1 |
| Loomis Sayles & CO L P | 242.0k | 0.80% | $25.3M | trimmed -7.7% | 2020 Q3 |
| Bessemer Group INC | 218.9k | 0.72% | $22.9M | trimmed -10.4% | 2021 Q1 |
| UBS | 204.5k | 0.67% | $21.4M | added +37.1% | ≤2013 |
| Royal Bank OF Canada | 192.0k | 0.63% | $20.1M | trimmed -18.6% | ≤2013 |
| Goldman Sachs | 171.0k | 0.56% | $17.9M | added +5.2% | ≤2013 |
| BNY Mellon | 166.2k | 0.55% | $17.4M | trimmed -3.8% | ≤2013 |
| Envestnet Asset Management INC | 154.7k | 0.51% | $16.2M | trimmed -9.8% | 2014 Q1 |
| Principal Financial Group INC | 149.9k | 0.49% | $15.7M | trimmed -2.2% | ≤2013 |
| Leeward Investments, LLC - MA | 149.6k | 0.49% | $15.6M | added +28.4% | 2022 Q1 |
| Tributary Capital Management, LLC | 146.0k | 0.48% | $15.3M | added +33.6% | 2016 Q2 |
| D. E. Shaw | 144.0k | 0.47% | $15.0M | added +41.9% | 2017 Q1 |
| Voloridge Investment Management | 132.0k | 0.43% | $13.8M | added +196.1% | 2025 Q3 |
| Nomura Asset Management International INC. | 110.5k | 0.36% | $11.5M | trimmed -44.5% | 2025 Q4 |
| KTF Investments, LLC | 105.2k | 0.35% | $11.0M | trimmed -5.3% | 2025 Q4 |
| NEW York State Common Retirement Fund | 102.5k | 0.34% | $10.7M | trimmed -0.7% | ≤2013 |
| Public Sector Pension Investment Board | 99.5k | 0.33% | $10.4M | added +3.3% | ≤2013 |
| Arrowstreet Capital | 95.8k | 0.32% | $10.0M | added +28.3% | 2024 Q1 |
| First Eagle Investment Management | 91.3k | 0.30% | $9.5M | added +24.5% | 2025 Q4 |
| Citadel Advisors | 88.8k | 0.29% | $9.3M | opened | 2017 Q3 |
| Millennium Management | 87.7k | 0.29% | $9.2M | added +73.8% | 2019 Q4 |
| Pembroke Management, LTD | 87.1k | 0.29% | $9.1M | trimmed -44.7% | 2019 Q4 |
| WCM Investment Management | 85.6k | 0.28% | $8.9M | trimmed -33.8% | 2016 Q3 |
| Nordea Investment Management AB | 82.8k | 0.27% | $8.6M | trimmed -4.8% | 2024 Q1 |
| Rhumbline Advisers | 75.0k | 0.25% | $7.8M | added +1.8% | ≤2013 |
Largest 50 of 307 shown; the full ranked, searchable register is at boothcheck.com/holders/DORM. 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.