Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
426 institutional managers reported holding GPK for the quarter ended Mar 31, 2026. Reported positions total over 95% of shares outstanding; the top 10 hold 55%. 76 opened new positions; 79 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 36.39M | 12.27% | $361.8M | added +39.7% | ≤2013 |
| Vanguard Group | 30.39M | 10.24% | $302.1M | added +3.3% | ≤2013 |
| Fuller & Thaler Asset Management, INC. | 20.32M | 6.85% | $201.9M | added +8.6% | 2014 Q2 |
| Allspring Global Investments Holdings, LLC | 18.00M | 6.07% | $179.0M | trimmed -7.7% | 2021 Q4 |
| Dimensional Fund Advisors | 10.86M | 3.66% | $108.0M | trimmed -7.4% | ≤2013 |
| State Street | 10.11M | 3.41% | $100.5M | added +2.4% | ≤2013 |
| FMR (Fidelity) | 10.00M | 3.37% | $99.4M | trimmed -13.2% | ≤2013 |
| DME Capital Management, LP (focused) | 9.10M | 3.07% | $90.5M | added +8.1% | 2024 Q1 |
| UBS | 8.89M | 3.00% | $88.3M | trimmed -13.9% | ≤2013 |
| Manning & Napier Advisors LLC | 8.48M | 2.86% | $84.3M | added +6288.6% | 2025 Q3 |
| AQR Capital | 7.97M | 2.69% | $79.2M | trimmed -8.3% | 2019 Q4 |
| American Century Companies INC | 7.80M | 2.63% | $77.5M | trimmed -59.5% | ≤2013 |
| Thompson Siegel & Walmsley LLC | 7.49M | 2.52% | $74.5M | added +20.9% | 2019 Q4 |
| MFS Investment Management | 7.46M | 2.51% | $74.1M | trimmed -30.7% | 2014 Q3 |
| Morgan Stanley | 6.28M | 2.12% | $62.4M | added +43.6% | ≤2013 |
| Geode Capital | 5.87M | 1.98% | $58.4M | added +3.7% | ≤2013 |
| Citadel Advisors | 5.47M | 1.84% | $54.4M | added +457.1% | 2020 Q4 |
| Millennium Management | 5.29M | 1.78% | $52.6M | added +254.8% | 2025 Q3 |
| Qube Research & Technologies LTD | 4.60M | 1.55% | $45.7M | added +341.1% | 2025 Q3 |
| Wellington Management | 4.53M | 1.53% | $45.0M | trimmed -31.2% | ≤2013 |
| Shapiro Capital Management LLC (focused) | 4.27M | 1.44% | $42.5M | trimmed -27% | 2018 Q3 |
| Bank OF America CORP /DE/ | 3.91M | 1.32% | $38.9M | added +16% | ≤2013 |
| Charles Schwab Investment Management | 3.73M | 1.26% | $37.1M | added +11.7% | ≤2013 |
| Letko, Brosseau & Associates INC | 3.47M | 1.17% | $34.5M | added +0.6% | 2022 Q2 |
| Squarepoint Ops LLC | 3.45M | 1.16% | $34.3M | added +13.7% | 2025 Q2 |
| D. E. Shaw | 3.14M | 1.06% | $31.2M | added +320.1% | 2024 Q4 |
| Two Sigma | 2.86M | 0.96% | $28.5M | added +247.5% | 2025 Q1 |
| Marshall Wace | 2.71M | 0.92% | $27.0M | added +59.7% | 2024 Q1 |
| Goldman Sachs | 2.69M | 0.91% | $26.8M | added +16.9% | ≤2013 |
| Northern Trust | 2.45M | 0.82% | $24.3M | added +3.1% | ≤2013 |
| OpenArc Corporate Advisory, LLC | 2.35M | 0.79% | $23.4M | added +7620.3% | 2025 Q4 |
| BNY Mellon | 2.03M | 0.69% | $20.2M | added +14.1% | ≤2013 |
| Voloridge Investment Management | 1.84M | 0.62% | $18.3M | added +92.9% | 2025 Q2 |
| LSV Asset Management | 1.76M | 0.59% | $17.5M | trimmed -8% | 2020 Q2 |
| Pictet Asset Management Holding SA | 1.73M | 0.58% | $17.2M | added +6.3% | ≤2013 |
| Tudor Investment | 1.59M | 0.53% | $15.8M | opened | 2025 Q3 |
| SEI Investments CO | 1.56M | 0.53% | $15.5M | added +4.1% | ≤2013 |
| Algert Global LLC | 1.56M | 0.53% | $15.5M | opened | 2026 Q1 |
| HRT Financial LP | 1.51M | 0.51% | $15.0M | added +88.9% | 2025 Q2 |
| Boston Partners | 1.50M | 0.51% | $14.9M | opened | 2026 Q1 |
| Private Management Group INC | 1.35M | 0.46% | $13.4M | opened | 2026 Q1 |
| Barclays PLC | 1.32M | 0.45% | $13.2M | added +557.9% | ≤2013 |
| Envestnet Asset Management INC | 1.29M | 0.43% | $12.8M | added +165.8% | ≤2013 |
| Invesco | 1.26M | 0.42% | $12.5M | added +13.3% | ≤2013 |
| Renaissance Technologies | 1.25M | 0.42% | $12.4M | trimmed -3.5% | 2025 Q2 |
| Holocene Advisors | 1.24M | 0.42% | $12.3M | added +531.6% | 2025 Q2 |
| Trexquant Investment LP | 1.20M | 0.41% | $12.0M | added +239.7% | 2025 Q1 |
| Milford Funds LTD | 1.18M | 0.40% | $11.7M | trimmed -59% | 2025 Q4 |
| Arrowstreet Capital | 1.15M | 0.39% | $11.4M | opened | 2026 Q1 |
| Man Group | 1.14M | 0.38% | $11.3M | added +19.4% | 2019 Q1 |
Largest 50 of 426 shown; the full ranked, searchable register is at boothcheck.com/holders/GPK. 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.