Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
443 institutional managers reported holding SSD for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 52%. 61 opened new positions; 46 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Vanguard Group | 4.12M | 9.96% | $707.1M | added +2% | ≤2013 |
| BlackRock | 4.03M | 9.75% | $691.8M | added +0.6% | ≤2013 |
| Kayne Anderson Rudnick Investment Management LLC | 3.89M | 9.39% | $666.7M | trimmed -3.3% | 2019 Q3 |
| FMR (Fidelity) | 2.65M | 6.40% | $454.1M | added +23.5% | 2016 Q2 |
| ValueAct (focused) | 1.40M | 3.38% | $239.9M | trimmed -5% | 2025 Q2 |
| Morgan Stanley | 1.30M | 3.14% | $222.6M | trimmed -13.8% | ≤2013 |
| State Street | 1.27M | 3.07% | $218.1M | added +2.2% | ≤2013 |
| Baker Avenue Asset Management, LP | 914.7k | 2.21% | $156.9M | trimmed -2.8% | 2022 Q3 |
| Dimensional Fund Advisors | 870.4k | 2.10% | $149.3M | trimmed -0.9% | ≤2013 |
| Quantinno Capital Management LP | 857.9k | 2.07% | $147.2M | unchanged | 2020 Q1 |
| Geode Capital | 787.7k | 1.90% | $135.1M | added +2.9% | ≤2013 |
| Neuberger Berman Group LLC | 760.1k | 1.84% | $130.4M | added +2.3% | 2024 Q1 |
| Capital International Investors | 663.2k | 1.60% | $113.8M | unchanged | 2021 Q2 |
| Bank OF Montreal /CAN/ | 648.0k | 1.57% | $111.2M | trimmed -4.5% | ≤2013 |
| Conestoga Capital Advisors, LLC | 605.3k | 1.46% | $103.9M | trimmed -28.7% | ≤2013 |
| First Trust Advisors LP | 582.2k | 1.41% | $99.9M | added +6.3% | 2013 Q3 |
| Northern Trust | 581.0k | 1.40% | $99.7M | added +2.6% | ≤2013 |
| Maren Capital LLC (focused) | 510.4k | 1.23% | $87.6M | unchanged | 2023 Q4 |
| Charles Schwab Investment Management | 506.7k | 1.23% | $86.9M | added +4.3% | ≤2013 |
| Fiduciary Management INC /WI/ | 434.2k | 1.05% | $74.5M | trimmed -4.6% | 2021 Q2 |
| Victory Capital Management INC | 423.7k | 1.02% | $72.7M | added +6.5% | 2015 Q2 |
| Goldman Sachs | 414.2k | 1.00% | $71.1M | trimmed -16.2% | ≤2013 |
| Port Capital LLC | 408.1k | 0.99% | $70.0M | unchanged | 2019 Q2 |
| Wells Fargo & COMPANY/MN | 397.8k | 0.96% | $68.3M | trimmed -3.4% | ≤2013 |
| Raymond James Financial INC | 324.1k | 0.78% | $55.6M | trimmed -12.5% | 2019 Q1 |
| Snyder Capital Management L P | 309.1k | 0.75% | $53.0M | added +2.8% | ≤2013 |
| Allspring Global Investments Holdings, LLC | 304.0k | 0.73% | $52.2M | trimmed -6.3% | 2021 Q4 |
| Brown Advisory INC | 303.6k | 0.73% | $52.1M | trimmed -7.3% | 2017 Q1 |
| BNY Mellon | 296.6k | 0.72% | $50.9M | added +1.8% | ≤2013 |
| Bank OF America CORP /DE/ | 291.3k | 0.70% | $50.0M | added +4% | ≤2013 |
| Royce & Associates | 285.8k | 0.69% | $49.0M | trimmed -1.8% | ≤2013 |
| Champlain Investment Partners, LLC | 254.5k | 0.61% | $43.7M | trimmed -19.5% | 2024 Q3 |
| Federated Hermes, INC. | 251.4k | 0.61% | $43.1M | trimmed -2.1% | 2018 Q1 |
| Schroder Investment Management Group | 247.3k | 0.60% | $42.4M | added +56.5% | 2013 Q3 |
| Disciplined Growth Investors INC /MN | 241.6k | 0.58% | $41.4M | trimmed -7.2% | 2025 Q1 |
| Gw&k Investment Management, LLC | 212.5k | 0.51% | $36.5M | trimmed -3.1% | 2024 Q2 |
| T. Rowe Price | 205.5k | 0.50% | $35.3M | trimmed -23.1% | ≤2013 |
| Manufacturers Life Insurance Company, THE | 199.5k | 0.48% | $34.2M | trimmed -1.9% | ≤2013 |
| State Farm Mutual Automobile Insurance CO | 181.9k | 0.44% | $31.2M | unchanged | ≤2013 |
| Bessemer Group INC | 181.5k | 0.44% | $31.1M | added +2.1% | 2019 Q4 |
| Riverbridge Partners LLC | 181.0k | 0.44% | $31.1M | trimmed -19.3% | 2024 Q4 |
| AQR Capital | 179.0k | 0.43% | $30.7M | added +13.1% | 2016 Q2 |
| MFS Investment Management | 173.8k | 0.42% | $29.8M | added +9.6% | 2021 Q1 |
| Royal Bank OF Canada | 173.4k | 0.42% | $29.8M | trimmed -11.7% | ≤2013 |
| Capital Group (American Funds) | 172.8k | 0.42% | $29.7M | unchanged | 2025 Q2 |
| SEI Investments CO | 163.2k | 0.40% | $28.0M | added +5.8% | 2016 Q3 |
| Adage Capital Partners GP, L.l.c. | 157.5k | 0.38% | $27.0M | added +5% | 2025 Q2 |
| Ranger Investment Management, L.p. | 154.9k | 0.37% | $26.6M | trimmed -0.8% | 2024 Q3 |
| UBS | 149.6k | 0.36% | $25.7M | added +13.5% | ≤2013 |
| Ameriprise Financial INC | 144.7k | 0.35% | $24.8M | trimmed -47.2% | ≤2013 |
Largest 50 of 443 shown; the full ranked, searchable register is at boothcheck.com/holders/SSD. 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.