Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
282 institutional managers reported holding BLKB for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 66%. 40 opened new positions; 57 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Clearlake Capital Group, L.p. (focused) | 9.75M | 21.04% | $376.4M | unchanged | 2020 Q4 |
| Vanguard Group | 5.27M | 11.37% | $203.4M | trimmed -2% | ≤2013 |
| BlackRock | 4.77M | 10.28% | $184.0M | unchanged | ≤2013 |
| Morgan Stanley | 4.27M | 9.20% | $164.6M | trimmed -1.2% | ≤2013 |
| Janus Henderson | 1.56M | 3.36% | $60.1M | added +3.9% | ≤2013 |
| State Street | 1.52M | 3.27% | $58.5M | added +0.7% | ≤2013 |
| Geode Capital | 971.1k | 2.10% | $37.5M | added +1% | ≤2013 |
| Dimensional Fund Advisors | 951.3k | 2.05% | $36.7M | trimmed -2.4% | ≤2013 |
| Geneva Capital Management LLC | 719.1k | 1.55% | $27.8M | trimmed -34% | 2020 Q1 |
| Van Berkom & Associates INC. | 718.7k | 1.55% | $27.7M | trimmed -7.9% | 2020 Q3 |
| Fuller & Thaler Asset Management, INC. | 684.5k | 1.48% | $26.4M | added +70.8% | 2024 Q2 |
| Goldman Sachs | 662.3k | 1.43% | $25.6M | added +130.9% | ≤2013 |
| Palisade Capital Management, LP | 577.4k | 1.25% | $22.3M | added +18.3% | ≤2013 |
| Northern Trust | 572.8k | 1.24% | $22.1M | unchanged | ≤2013 |
| Shapiro Capital Management LLC (focused) | 516.6k | 1.11% | $19.9M | added +56.5% | 2025 Q2 |
| Charles Schwab Investment Management | 495.7k | 1.07% | $19.1M | added +6.5% | ≤2013 |
| P2 Capital Partners, LLC (focused) | 482.9k | 1.04% | $18.6M | trimmed -23.4% | 2022 Q2 |
| Qube Research & Technologies LTD | 473.3k | 1.02% | $18.3M | added +256.8% | 2023 Q2 |
| First Trust Advisors LP | 405.3k | 0.87% | $15.6M | added +2.9% | 2021 Q4 |
| BNY Mellon | 360.4k | 0.78% | $13.9M | trimmed -9.3% | ≤2013 |
| Bank OF America CORP /DE/ | 351.8k | 0.76% | $13.6M | trimmed -34.7% | ≤2013 |
| Clearline Capital LP | 350.2k | 0.76% | $13.5M | trimmed -9.1% | 2025 Q1 |
| AQR Capital | 347.3k | 0.75% | $13.4M | trimmed -54.8% | 2017 Q2 |
| Jane Street | 317.7k | 0.69% | $12.3M | added +58.7% | 2020 Q2 |
| Arrowstreet Capital | 313.0k | 0.68% | $12.1M | added +50.2% | 2024 Q4 |
| UBS | 302.2k | 0.65% | $11.7M | added +18.6% | ≤2013 |
| Public Sector Pension Investment Board | 268.8k | 0.58% | $10.4M | added +25.3% | 2025 Q1 |
| Tributary Capital Management, LLC | 227.3k | 0.49% | $8.8M | trimmed -7.5% | 2021 Q1 |
| FMR (Fidelity) | 224.0k | 0.48% | $8.6M | added +23.9% | 2018 Q3 |
| NEW York State Common Retirement Fund | 224.0k | 0.48% | $8.6M | added +20.9% | ≤2013 |
| Public Employees Retirement Association OF Colorado | 212.0k | 0.46% | $8.2M | trimmed -32.9% | ≤2013 |
| Voloridge Investment Management | 178.8k | 0.39% | $6.9M | added +75.6% | 2024 Q3 |
| Allspring Global Investments Holdings, LLC | 170.0k | 0.37% | $6.6M | added +7.4% | 2021 Q4 |
| Robeco Institutional Asset Management B.v. | 162.2k | 0.35% | $6.3M | opened | 2026 Q1 |
| Two Sigma | 162.0k | 0.35% | $6.3M | opened | 2026 Q1 |
| Point72 | 160.6k | 0.35% | $6.2M | added +133.6% | 2024 Q4 |
| Citadel Advisors | 151.9k | 0.33% | $5.9M | trimmed -33.6% | 2015 Q2 |
| Hillsdale Investment Management INC. | 138.1k | 0.30% | $5.3M | added +13.3% | 2025 Q4 |
| Lord, Abbett & CO. LLC | 133.9k | 0.29% | $5.2M | added +31.9% | 2025 Q4 |
| Calamos Advisors LLC | 133.0k | 0.29% | $5.1M | unchanged | 2023 Q2 |
| Millennium Management | 129.5k | 0.28% | $5.0M | trimmed -3% | 2018 Q3 |
| Invesco | 127.2k | 0.27% | $4.9M | added +19.9% | ≤2013 |
| SG Capital Management LLC | 123.0k | 0.27% | $4.7M | trimmed -63.8% | 2025 Q2 |
| Rhumbline Advisers | 114.3k | 0.25% | $4.4M | trimmed -0.5% | ≤2013 |
| Man Group | 112.2k | 0.24% | $4.3M | trimmed -3% | 2018 Q1 |
| Susquehanna International Group | 98.3k | 0.21% | $3.8M | added +518.2% | 2018 Q2 |
| Envestnet Asset Management INC | 97.9k | 0.21% | $3.8M | trimmed -10.6% | ≤2013 |
| Nuveen | 93.6k | 0.20% | $3.6M | trimmed -63.2% | 2019 Q2 |
| D. E. Shaw | 89.4k | 0.19% | $3.5M | trimmed -23.9% | ≤2013 |
| Capital Fund Management S.a. | 83.3k | 0.18% | $3.2M | added +97.5% | 2025 Q1 |
Largest 50 of 282 shown; the full ranked, searchable register is at boothcheck.com/holders/BLKB. 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.