Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
194 institutional managers reported holding GPGI for the quarter ended Mar 31, 2026. Together they hold about 93% of shares outstanding; the top 10 hold 70%. 43 opened new positions; 59 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Platinum Equity Advisors, LLC/DE (focused) | 52.83M | 19.57% | $903.4M | opened | 2026 Q1 |
| FMR (Fidelity) | 39.55M | 14.65% | $676.3M | added +29082.3% | 2022 Q3 |
| Alyeska Investment Group | 21.40M | 7.92% | $365.9M | added +4160.3% | 2024 Q3 |
| Vanguard Group | 17.48M | 6.47% | $298.8M | added +240.1% | 2022 Q1 |
| Locust Wood Capital Advisers, LLC (focused) | 13.70M | 5.07% | $234.2M | added +54.5% | 2024 Q3 |
| BlackRock | 13.68M | 5.07% | $233.9M | added +186% | 2022 Q1 |
| Capital Research Global Investors | 11.26M | 4.17% | $192.6M | added +22.2% | 2025 Q4 |
| Corsair Capital Management, L.p. | 8.47M | 3.14% | $144.8M | added +101.7% | 2025 Q1 |
| Barrow Hanley Mewhinney & Strauss LLC | 5.60M | 2.08% | $95.8M | added +2775.7% | 2025 Q4 |
| Alberta Investment Management CORP | 5.41M | 2.00% | $92.4M | opened | 2026 Q1 |
| Capital Group (American Funds) | 5.19M | 1.92% | $88.7M | added +13% | 2024 Q4 |
| Starboard Value (focused) | 5.03M | 1.86% | $86.0M | opened | 2026 Q1 |
| UBS | 4.25M | 1.57% | $72.7M | added +199.2% | 2022 Q3 |
| Geode Capital | 4.18M | 1.55% | $71.4M | added +182.1% | 2021 Q4 |
| Bleichroeder LP | 3.97M | 1.47% | $67.9M | unchanged | 2022 Q1 |
| State Street | 3.94M | 1.46% | $67.3M | added +205.6% | 2022 Q1 |
| Nine Ten Capital Management LLC (focused) | 2.90M | 1.08% | $49.7M | added +20.1% | 2024 Q4 |
| T. Rowe Price Investment Management, INC. | 2.87M | 1.06% | $49.0M | opened | 2026 Q1 |
| Thrivent Financial for Lutherans | 2.79M | 1.03% | $47.7M | trimmed -2.6% | 2025 Q3 |
| Janus Henderson | 2.12M | 0.78% | $36.2M | added +10911% | 2024 Q2 |
| Clearbridge Investments, LLC | 1.89M | 0.70% | $32.3M | added +158.5% | 2025 Q4 |
| Morgan Stanley | 1.88M | 0.70% | $32.2M | added +355.8% | 2022 Q1 |
| Northern Trust | 1.81M | 0.67% | $31.0M | added +141.4% | 2022 Q1 |
| Zuckerman Investment Group, LLC | 1.59M | 0.59% | $27.2M | unchanged | 2024 Q3 |
| Charles Schwab Investment Management | 1.47M | 0.55% | $25.2M | added +164% | 2022 Q2 |
| Bank OF America CORP /DE/ | 1.29M | 0.48% | $22.0M | added +33.7% | 2021 Q4 |
| Chescapmanager LLC (focused) | 1.06M | 0.39% | $18.2M | added +128.8% | 2025 Q4 |
| Bwcp, LP (focused) | 1.06M | 0.39% | $18.1M | opened | 2026 Q1 |
| Tikvah Management LLC (focused) | 1.01M | 0.37% | $17.3M | trimmed -32.9% | 2022 Q1 |
| AlTi Global, INC. | 807.6k | 0.30% | $13.8M | unchanged | 2024 Q4 |
| Tidal Investments LLC | 676.5k | 0.25% | $11.6M | trimmed -58.4% | 2021 Q4 |
| Ancora Advisors LLC | 623.5k | 0.23% | $10.7M | added +26.2% | 2025 Q1 |
| Wellington Management | 561.4k | 0.21% | $9.6M | trimmed -79.7% | 2022 Q3 |
| BNY Mellon | 503.7k | 0.19% | $8.6M | added +175.3% | 2022 Q2 |
| Goldman Sachs | 458.3k | 0.17% | $7.8M | added +52.2% | 2022 Q3 |
| Nuveen | 436.9k | 0.16% | $7.5M | added +242% | 2022 Q2 |
| Catawba River Capital (focused) | 386.7k | 0.14% | $6.6M | added +1179.5% | 2025 Q4 |
| Swiss National Bank | 368.6k | 0.14% | $6.3M | added +233.3% | 2024 Q4 |
| Russell Investments Group, LTD. | 358.6k | 0.13% | $6.1M | added +43.4% | 2022 Q2 |
| Ballast Asset Management, LP | 290.4k | 0.11% | $5.0M | added +2.5% | 2024 Q3 |
| Bard Associates INC | 285.1k | 0.11% | $4.9M | unchanged | 2024 Q1 |
| First Manhattan CO. LLC. | 270.5k | 0.10% | $4.6M | trimmed -2.1% | 2025 Q1 |
| Rice Hall James & Associates, LLC | 255.4k | 0.10% | $4.4M | trimmed -1.4% | 2024 Q3 |
| Prospect Capital Advisors, LLC (focused) | 240.3k | 0.09% | $4.1M | trimmed -23.1% | 2024 Q3 |
| Cannell Capital LLC (focused) | 238.2k | 0.09% | $4.1M | trimmed -34.6% | 2023 Q1 |
| Archon Partners LLC (focused) | 230.0k | 0.09% | $3.9M | opened | 2026 Q1 |
| California State Teachers Retirement System | 219.5k | 0.08% | $3.8M | added +310.2% | 2022 Q2 |
| AllianceBernstein | 207.0k | 0.08% | $3.5M | added +232% | 2024 Q2 |
| SEI Investments CO | 193.2k | 0.07% | $3.3M | added +73.8% | 2025 Q3 |
| T. Rowe Price | 186.9k | 0.07% | $3.2M | added +487.8% | 2024 Q4 |
Largest 50 of 194 shown; the full ranked, searchable register is at boothcheck.com/holders/GPGI. 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.