Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
335 institutional managers reported holding DSGX for the quarter ended Mar 31, 2026. Together they hold about 77% of shares outstanding; the top 10 hold 32%. 50 opened new positions; 64 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| T. Rowe Price | 6.26M | 7.15% | $448.6M | trimmed -10.4% | 2014 Q2 |
| 1832 Asset Management L.p. | 3.83M | 4.38% | $274.5M | added +47.8% | 2016 Q2 |
| Vanguard Group | 3.68M | 4.21% | $263.8M | added +1.9% | 2015 Q1 |
| Janus Henderson | 2.57M | 2.94% | $184.3M | added +4.1% | 2018 Q1 |
| Mackenzie Financial CORP | 2.45M | 2.79% | $175.2M | trimmed -27.4% | ≤2013 |
| T. Rowe Price Investment Management, INC. | 2.18M | 2.49% | $156.3M | added +712.4% | 2022 Q3 |
| Conestoga Capital Advisors, LLC | 2.11M | 2.41% | $151.2M | trimmed -15.8% | 2016 Q4 |
| Bank OF Montreal /CAN/ | 1.53M | 1.74% | $109.3M | trimmed -2% | ≤2013 |
| Morgan Stanley | 1.49M | 1.70% | $106.6M | trimmed -6% | 2013 Q4 |
| Temasek Holdings | 1.46M | 1.67% | $104.8M | unchanged | 2025 Q2 |
| Geneva Capital Management LLC | 1.33M | 1.52% | $95.1M | trimmed -7.1% | 2020 Q1 |
| Arrowstreet Capital | 1.26M | 1.44% | $90.1M | trimmed -27.8% | 2023 Q1 |
| Connor, Clark & Lunn Investment Management LTD. | 1.22M | 1.39% | $87.0M | added +140.2% | 2013 Q4 |
| Waratah Capital Advisors LTD. | 1.19M | 1.36% | $85.2M | added +969.1% | 2025 Q4 |
| PRIMECAP Management | 1.18M | 1.35% | $84.4M | unchanged | ≤2013 |
| Two Sigma | 1.13M | 1.29% | $81.1M | added +173% | 2016 Q4 |
| Manufacturers Life Insurance Company, THE | 1.10M | 1.26% | $78.8M | added +140.5% | 2013 Q4 |
| Geode Capital | 1.09M | 1.24% | $78.0M | trimmed -3% | 2014 Q1 |
| Select Equity Group | 1.08M | 1.23% | $77.3M | added +182.5% | 2025 Q4 |
| Cibc Asset Management INC | 1.06M | 1.21% | $75.9M | trimmed -9.1% | 2013 Q4 |
| FMR (Fidelity) | 1.04M | 1.19% | $74.5M | added +8.7% | 2019 Q4 |
| TD Asset Management INC | 1.01M | 1.16% | $72.6M | added +48.2% | 2013 Q4 |
| D. E. Shaw | 988.7k | 1.13% | $70.8M | added +23.6% | 2021 Q2 |
| Fiera Capital CORP | 837.2k | 0.96% | $59.9M | trimmed -38.9% | ≤2013 |
| Westfield Capital Management CO LP | 801.9k | 0.92% | $57.4M | trimmed -32.8% | 2024 Q1 |
| Renaissance Technologies | 798.8k | 0.91% | $57.2M | added +18.7% | ≤2013 |
| Goldman Sachs | 769.0k | 0.88% | $55.1M | added +33.7% | 2017 Q1 |
| Bank OF America CORP /DE/ | 733.5k | 0.84% | $52.5M | added +62% | ≤2013 |
| Royal Bank OF Canada | 657.2k | 0.75% | $47.1M | trimmed -5.2% | ≤2013 |
| BlackRock | 650.8k | 0.74% | $46.6M | added +76.4% | 2018 Q4 |
| Franklin Resources | 603.8k | 0.69% | $43.2M | trimmed -19.9% | 2018 Q1 |
| BNP Paribas Financial Markets | 555.0k | 0.63% | $39.7M | added +129.3% | 2022 Q3 |
| Picton Mahoney Asset Management | 553.6k | 0.63% | $39.6M | added +11.5% | 2025 Q2 |
| AQR Capital | 511.7k | 0.58% | $36.6M | added +169.2% | 2025 Q3 |
| Clearbridge Investments, LLC | 474.3k | 0.54% | $34.0M | added +17.4% | 2023 Q4 |
| American Century Companies INC | 468.5k | 0.54% | $33.5M | added +2843.6% | 2014 Q2 |
| Principal Financial Group INC | 465.4k | 0.53% | $33.3M | added +67% | 2022 Q1 |
| Riverbridge Partners LLC | 451.4k | 0.52% | $32.3M | trimmed -15.5% | 2019 Q2 |
| Bank OF Nova Scotia | 434.6k | 0.50% | $31.1M | trimmed -3.2% | 2014 Q4 |
| FIL LTD | 404.1k | 0.46% | $28.9M | added +630% | 2014 Q1 |
| Sone Capital Management, LLC | 391.8k | 0.45% | $28.1M | added +98.4% | 2024 Q4 |
| Legal & General Group PLC | 391.6k | 0.45% | $28.0M | trimmed -5.1% | 2016 Q1 |
| Toronto Dominion Bank | 368.3k | 0.42% | $26.4M | trimmed -7.2% | ≤2013 |
| UBS | 348.4k | 0.40% | $24.9M | added +54.2% | ≤2013 |
| Dixon Mitchell Investment Counsel INC. | 340.4k | 0.39% | $24.4M | added +2.5% | 2025 Q2 |
| Dimensional Fund Advisors | 333.3k | 0.38% | $23.9M | added +1.8% | 2017 Q1 |
| SEB Asset Management AB | 319.4k | 0.36% | $22.9M | opened | 2026 Q1 |
| Premier Fund Managers LTD | 317.5k | 0.36% | $22.7M | trimmed -6.8% | 2020 Q2 |
| Praesidium Investment Management Company, LLC (focused) | 307.5k | 0.35% | $22.0M | added +85% | 2024 Q4 |
| Marshall Wace | 305.9k | 0.35% | $21.9M | added +455.9% | 2025 Q3 |
Largest 50 of 335 shown; the full ranked, searchable register is at boothcheck.com/holders/DSGX. 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.