Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
456 institutional managers reported holding BKH for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 53%. 56 opened new positions; 49 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 12.13M | 16.05% | $842.5M | unchanged | ≤2013 |
| Vanguard Group | 9.07M | 11.99% | $629.7M | added +0.8% | ≤2013 |
| State Street | 3.62M | 4.79% | $251.5M | trimmed -4.2% | 2015 Q4 |
| Nomura Asset Management International INC. | 2.68M | 3.54% | $186.1M | added +0.9% | 2025 Q4 |
| Capital Research Global Investors | 2.28M | 3.01% | $158.1M | unchanged | 2022 Q1 |
| Two Sigma | 2.22M | 2.93% | $153.9M | added +88.3% | 2023 Q2 |
| Adage Capital Partners GP, L.l.c. | 2.07M | 2.74% | $143.8M | added +30% | 2025 Q2 |
| Geode Capital | 1.99M | 2.64% | $138.6M | added +5.3% | ≤2013 |
| Point72 | 1.94M | 2.57% | $135.0M | added +3.6% | 2023 Q2 |
| Covalis Capital LLP | 1.75M | 2.32% | $121.8M | trimmed -14.8% | 2025 Q4 |
| AQR Capital | 1.60M | 2.11% | $110.8M | added +12.5% | 2017 Q3 |
| Goldman Sachs | 1.58M | 2.10% | $110.1M | added +63.8% | ≤2013 |
| Franklin Resources | 1.58M | 2.08% | $109.5M | added +89.3% | 2015 Q4 |
| Cohen & Steers | 1.27M | 1.68% | $88.1M | trimmed -8.5% | 2025 Q3 |
| Charles Schwab Investment Management | 1.22M | 1.61% | $84.5M | added +2.1% | ≤2013 |
| Dimensional Fund Advisors | 1.14M | 1.51% | $79.3M | added +1.6% | ≤2013 |
| Engineers Gate Manager LP | 1.06M | 1.41% | $73.8M | added +25.2% | 2023 Q1 |
| Invesco | 1.06M | 1.40% | $73.7M | added +74% | ≤2013 |
| Nuveen | 973.2k | 1.29% | $67.6M | trimmed -20.9% | ≤2013 |
| Northern Trust | 944.3k | 1.25% | $65.6M | added +2.8% | ≤2013 |
| Citadel Advisors | 903.0k | 1.19% | $62.7M | added +797% | 2019 Q1 |
| Bank OF America CORP /DE/ | 900.0k | 1.19% | $62.5M | added +109.2% | ≤2013 |
| Morgan Stanley | 820.8k | 1.09% | $57.0M | added +44.8% | ≤2013 |
| BNY Mellon | 784.3k | 1.04% | $54.5M | trimmed -0.7% | ≤2013 |
| Fuller & Thaler Asset Management, INC. | 768.7k | 1.02% | $53.4M | trimmed -4% | 2020 Q4 |
| Zimmer Partners, LP | 741.0k | 0.98% | $51.5M | added +168.5% | 2024 Q3 |
| First Trust Advisors LP | 705.1k | 0.93% | $49.0M | trimmed -3.3% | ≤2013 |
| Victory Capital Management INC | 685.1k | 0.91% | $47.6M | trimmed -3% | 2014 Q4 |
| Pictet Asset Management Holding SA | 593.5k | 0.79% | $41.2M | added +5286.1% | 2020 Q1 |
| GAMCO (Gabelli) | 530.3k | 0.70% | $36.8M | trimmed -0.6% | 2013 Q3 |
| Crawford Investment Counsel INC | 516.8k | 0.68% | $35.9M | added +5.6% | 2019 Q3 |
| UBS | 514.6k | 0.68% | $35.7M | trimmed -25.2% | ≤2013 |
| Duff & Phelps Investment Management CO | 459.5k | 0.61% | $31.9M | added +17.9% | 2019 Q2 |
| ProShare Advisors LLC | 447.6k | 0.59% | $31.1M | trimmed -25.8% | ≤2013 |
| OLD Republic International CORP | 416.0k | 0.55% | $28.9M | unchanged | 2018 Q1 |
| Manufacturers Life Insurance Company, THE | 395.0k | 0.52% | $27.4M | unchanged | ≤2013 |
| Freestone Grove Partners LP | 392.8k | 0.52% | $27.3M | added +47.7% | 2025 Q3 |
| Janus Henderson | 373.7k | 0.49% | $26.0M | trimmed -6.2% | 2017 Q2 |
| Hotchkis & Wiley Capital Management LLC | 352.6k | 0.47% | $24.5M | trimmed -7.4% | 2022 Q3 |
| D. E. Shaw | 347.7k | 0.46% | $24.1M | added +582.7% | 2025 Q3 |
| HighTower Advisors, LLC | 334.5k | 0.44% | $23.2M | added +20% | 2015 Q4 |
| Principal Financial Group INC | 320.9k | 0.42% | $22.3M | added +96.4% | ≤2013 |
| Legal & General Group PLC | 313.8k | 0.41% | $21.8M | trimmed -7.6% | ≤2013 |
| Connor, Clark & Lunn Investment Management LTD. | 281.4k | 0.37% | $19.5M | added +76.6% | 2025 Q1 |
| Squarepoint Ops LLC | 269.1k | 0.36% | $18.7M | added +26.3% | 2024 Q4 |
| Yaupon Capital Management LP | 246.6k | 0.33% | $17.1M | added +77.5% | 2025 Q4 |
| Think Investments LP (focused) | 237.5k | 0.31% | $16.5M | trimmed -55.8% | 2025 Q4 |
| Rhumbline Advisers | 230.8k | 0.30% | $16.0M | added +2.4% | ≤2013 |
| Paradiem, LLC | 224.9k | 0.30% | $15.6M | trimmed -4.2% | 2024 Q4 |
| Gamco Investors, INC. et al | 207.3k | 0.27% | $14.4M | unchanged | 2013 Q3 |
Largest 50 of 456 shown; the full ranked, searchable register is at boothcheck.com/holders/BKH. 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.