Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
78 institutional managers reported holding SID for the quarter ended Mar 31, 2026. Together they hold about 67% of shares outstanding; the top 10 hold 48%. 18 opened new positions; 19 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Renaissance Technologies | 5.02M | 9.42% | $6.2M | added +41.9% | 2020 Q4 |
| Vanguard Group | 4.74M | 8.90% | $5.9M | trimmed -1.9% | ≤2013 |
| Dimensional Fund Advisors | 3.58M | 6.72% | $4.4M | unchanged | ≤2013 |
| American Century Companies INC | 3.11M | 5.84% | $3.8M | added +22.2% | 2019 Q2 |
| Jane Street | 1.85M | 3.48% | $2.3M | trimmed -27% | 2014 Q1 |
| State Street | 1.72M | 3.23% | $2.1M | added +4.4% | ≤2013 |
| Banque Cantonale Vaudoise | 1.60M | 3.00% | $2.0M | added +100% | 2025 Q4 |
| UBS | 1.59M | 2.97% | $2.0M | added +24.4% | ≤2013 |
| Goldman Sachs | 1.13M | 2.12% | $1.4M | trimmed -25.5% | ≤2013 |
| Morgan Stanley | 1.04M | 1.95% | $1.3M | trimmed -36.8% | ≤2013 |
| Marshall Wace | 988.1k | 1.85% | $1.2M | added +70.1% | 2025 Q1 |
| BNP Paribas Financial Markets | 914.2k | 1.72% | $1.1M | added +90.1% | ≤2013 |
| Two Sigma | 861.4k | 1.62% | $1.1M | trimmed -55.5% | 2022 Q3 |
| Millennium Management | 835.6k | 1.57% | $1.0M | trimmed -73.6% | 2022 Q1 |
| Citadel Advisors | 807.7k | 1.51% | $997k | trimmed -59.8% | 2014 Q4 |
| Caption Management, LLC | 663.4k | 1.25% | $819k | opened | 2026 Q1 |
| Northern Trust | 558.9k | 1.05% | $690k | trimmed -2.2% | ≤2013 |
| XTX Topco LTD | 524.1k | 0.98% | $647k | trimmed -29.5% | 2024 Q1 |
| HRT Financial LP | 478.9k | 0.90% | $591k | trimmed -15.1% | 2025 Q3 |
| BlackRock | 418.1k | 0.79% | $516k | added +14.9% | 2020 Q3 |
| VAN ECK Associates CORP | 388.5k | 0.73% | $480k | trimmed -15.4% | ≤2013 |
| Barometer Capital Management INC. | 374.8k | 0.70% | $463k | added +2415.4% | 2023 Q4 |
| Headlands Technologies LLC | 374.7k | 0.70% | $463k | added +800.4% | 2023 Q4 |
| Storebrand Asset Management AS | 224.8k | 0.42% | $278k | unchanged | 2025 Q4 |
| Stokes Family Office, LLC | 160.0k | 0.30% | $198k | added +100% | 2025 Q4 |
| Engineers Gate Manager LP | 139.0k | 0.26% | $172k | opened | 2026 Q1 |
| Inspire Investing, LLC | 136.2k | 0.26% | $168k | trimmed -7.1% | 2022 Q2 |
| Susquehanna International Group | 130.9k | 0.25% | $162k | trimmed -11.1% | 2021 Q3 |
| Invesco | 124.0k | 0.23% | $153k | trimmed -29.8% | ≤2013 |
| Virtu Financial LLC | 111.2k | 0.21% | $137k | opened | 2026 Q1 |
| TWO Sigma Securities, LLC | 80.6k | 0.15% | $100k | opened | 2022 Q2 |
| Point72 | 58.4k | 0.11% | $72k | trimmed -64.6% | 2025 Q4 |
| LPL Financial LLC | 54.3k | 0.10% | $67k | added +153.9% | 2025 Q4 |
| EntryPoint Capital, LLC | 50.5k | 0.10% | $62k | opened | 2026 Q1 |
| Simplex Trading, LLC | 44.6k | 0.08% | $55k | opened | 2024 Q4 |
| Scientech Research LLC | 42.4k | 0.08% | $52k | opened | 2025 Q3 |
| D. E. Shaw | 40.9k | 0.08% | $50k | trimmed -72.7% | 2024 Q2 |
| Centiva Capital, LP | 40.8k | 0.08% | $50k | opened | 2026 Q1 |
| Plan A Wealth LLC | 38.3k | 0.07% | $47k | added +3.5% | 2025 Q1 |
| First Affirmative Financial Network | 34.5k | 0.07% | $43k | opened | 2023 Q4 |
| SmartHarvest Portfolios, LLC | 33.2k | 0.06% | $41k | opened | 2026 Q1 |
| Tudor Investment | 31.3k | 0.06% | $39k | opened | 2026 Q1 |
| Tower Research Capital LLC (TRC) | 30.0k | 0.06% | $37k | opened | 2026 Q1 |
| AXQ Capital, LP | 27.2k | 0.05% | $34k | opened | 2026 Q1 |
| Bank OF America CORP /DE/ | 26.0k | 0.05% | $32k | trimmed -96.5% | ≤2013 |
| R Squared LTD | 23.7k | 0.04% | $29k | trimmed -27.6% | 2024 Q4 |
| Larch Capital Partners LLC | 23.4k | 0.04% | $29k | opened | 2026 Q1 |
| SG Americas Securities, LLC | 19.9k | 0.04% | $25k | trimmed -80% | 2025 Q1 |
| Hsbc Holdings PLC | 19.8k | 0.04% | $24k | opened | 2019 Q1 |
| MML Investors Services, LLC | 19.1k | 0.04% | $24k | added +8% | 2025 Q2 |
Largest 50 of 78 shown; the full ranked, searchable register is at boothcheck.com/holders/SID. 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.