Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
402 institutional managers reported holding QLYS for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 51%. 57 opened new positions; 90 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 5.36M | 15.03% | $471.1M | unchanged | ≤2013 |
| Vanguard Group | 4.44M | 12.43% | $389.8M | added +1.4% | ≤2013 |
| State Street | 1.39M | 3.89% | $122.0M | added +3% | ≤2013 |
| Geode Capital | 1.32M | 3.70% | $116.1M | added +5.2% | ≤2013 |
| AQR Capital | 1.04M | 2.91% | $91.3M | added +64% | 2013 Q4 |
| Legal & General Group PLC | 1.03M | 2.89% | $90.5M | trimmed -11% | 2014 Q3 |
| Boston Trust Walden CORP | 1.01M | 2.83% | $88.8M | trimmed -8.5% | 2021 Q1 |
| First Trust Advisors LP | 996.1k | 2.79% | $87.5M | trimmed -27.4% | 2015 Q1 |
| Arrowstreet Capital | 832.8k | 2.33% | $73.2M | added +127% | 2021 Q4 |
| Dimensional Fund Advisors | 763.1k | 2.14% | $67.1M | added +6.4% | 2015 Q4 |
| Penserra Capital Management LLC | 732.5k | 2.05% | $64.4M | added +33.9% | 2023 Q3 |
| Morgan Stanley | 646.4k | 1.81% | $56.8M | trimmed -6.6% | 2013 Q4 |
| UBS | 610.8k | 1.71% | $53.7M | added +12.1% | ≤2013 |
| RWA Wealth Partners, LLC | 548.8k | 1.54% | $48.2M | trimmed -6.8% | 2025 Q3 |
| Northern Trust | 510.5k | 1.43% | $44.9M | unchanged | ≤2013 |
| Charles Schwab Investment Management | 502.4k | 1.41% | $44.2M | added +6.8% | ≤2013 |
| Renaissance Technologies | 497.6k | 1.40% | $43.7M | added +3.6% | 2021 Q3 |
| Neuberger Berman Group LLC | 470.1k | 1.32% | $41.3M | trimmed -42.3% | 2015 Q2 |
| Cdam (UK) LTD (focused) | 469.0k | 1.31% | $41.2M | added +21.3% | 2020 Q1 |
| London CO OF Virginia | 466.3k | 1.31% | $41.0M | added +19.8% | 2021 Q1 |
| Mirae Asset Global Etfs Holdings LTD. | 447.7k | 1.25% | $39.3M | added +3.7% | 2017 Q1 |
| Invesco | 380.8k | 1.07% | $33.5M | added +1.2% | 2013 Q3 |
| Clark Capital Management Group, INC. | 380.5k | 1.07% | $33.4M | added +4.6% | 2024 Q4 |
| Goldman Sachs | 324.2k | 0.91% | $28.5M | trimmed -5% | 2013 Q3 |
| BNY Mellon | 318.3k | 0.89% | $28.0M | trimmed -3.6% | ≤2013 |
| Alyeska Investment Group | 304.7k | 0.85% | $26.8M | opened | 2025 Q3 |
| Voya Investment Management LLC | 297.4k | 0.83% | $26.1M | added +2.6% | 2014 Q2 |
| BNP Paribas Financial Markets | 258.9k | 0.73% | $22.7M | trimmed -8.9% | 2014 Q2 |
| Tudor Investment | 250.9k | 0.70% | $22.0M | added +15.4% | 2025 Q1 |
| Fort Washington Investment Advisors INC /OH/ | 243.9k | 0.68% | $21.4M | added +16.8% | 2023 Q2 |
| Portolan Capital Management, LLC | 239.0k | 0.67% | $21.0M | added +361% | 2025 Q4 |
| Millennium Management | 235.4k | 0.66% | $20.7M | trimmed -4.1% | 2018 Q3 |
| Fundsmith (focused) | 226.1k | 0.63% | $19.9M | trimmed -65.1% | 2020 Q2 |
| Envestnet Asset Management INC | 207.7k | 0.58% | $18.3M | added +38% | 2015 Q3 |
| Bank OF America CORP /DE/ | 206.6k | 0.58% | $18.2M | trimmed -24% | ≤2013 |
| Citadel Advisors | 203.5k | 0.57% | $17.9M | added +371.1% | 2018 Q2 |
| Canada Life Assurance CO | 188.7k | 0.53% | $16.6M | added +22.3% | 2015 Q1 |
| Ameriprise Financial INC | 184.0k | 0.52% | $16.2M | added +3.1% | ≤2013 |
| Acadian Asset Management | 182.1k | 0.51% | $16.0M | added +57.9% | 2023 Q4 |
| Retirement Systems of Alabama | 181.6k | 0.51% | $16.0M | added +0.5% | 2020 Q2 |
| Federated Hermes, INC. | 180.3k | 0.51% | $15.8M | added +3.6% | 2017 Q4 |
| Nordea Investment Management AB | 168.0k | 0.47% | $14.8M | added +33.7% | 2019 Q4 |
| Trexquant Investment LP | 156.0k | 0.44% | $13.7M | added +115.2% | 2021 Q3 |
| Two Sigma | 155.0k | 0.43% | $13.6M | trimmed -24.9% | 2019 Q2 |
| Principal Financial Group INC | 147.6k | 0.41% | $13.0M | added +18.5% | 2015 Q4 |
| Marshall Wace | 143.5k | 0.40% | $12.6M | added +5438.4% | 2024 Q2 |
| Barclays PLC | 135.5k | 0.38% | $11.9M | added +16.1% | ≤2013 |
| Janus Henderson | 126.2k | 0.35% | $11.1M | added +2.8% | 2017 Q3 |
| D. E. Shaw | 125.1k | 0.35% | $11.0M | added +95% | 2019 Q1 |
| Oberweis Asset Management INC/ | 118.9k | 0.33% | $10.4M | added +10.3% | 2024 Q4 |
Largest 50 of 402 shown; the full ranked, searchable register is at boothcheck.com/holders/QLYS. 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.