Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
763 institutional managers reported holding FLEX for the quarter ended Mar 31, 2026. Together they hold about 93% of shares outstanding; the top 10 hold 56%. 112 opened new positions; 98 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| BlackRock | 45.04M | 11.98% | $2.95B | trimmed -10.2% | ≤2013 |
| Vanguard Group | 39.16M | 10.42% | $2.56B | added +1% | ≤2013 |
| PRIMECAP Management | 25.38M | 6.75% | $1.66B | trimmed -4.9% | ≤2013 |
| Janus Henderson | 20.62M | 5.48% | $1.35B | trimmed -7.7% | ≤2013 |
| Wellington Management | 20.24M | 5.38% | $1.33B | added +14.8% | 2016 Q4 |
| FMR (Fidelity) | 16.38M | 4.36% | $1.07B | trimmed -6.4% | ≤2013 |
| State Street | 14.27M | 3.80% | $934.7M | added +1.5% | ≤2013 |
| Boston Partners | 12.99M | 3.46% | $850.9M | added +7.3% | ≤2013 |
| Geode Capital | 8.31M | 2.21% | $544.1M | added +9.2% | ≤2013 |
| Invesco | 7.24M | 1.93% | $473.9M | trimmed -12.7% | ≤2013 |
| Lyrical Asset Management LP (focused) | 6.96M | 1.85% | $455.9M | trimmed -7.6% | 2017 Q2 |
| Voya Investment Management LLC | 5.92M | 1.57% | $387.9M | unchanged | 2022 Q3 |
| Dimensional Fund Advisors | 5.58M | 1.49% | $365.7M | trimmed -2.7% | ≤2013 |
| MFS Investment Management | 5.42M | 1.44% | $354.9M | trimmed -1.7% | 2022 Q2 |
| UBS | 5.20M | 1.38% | $340.8M | added +30.8% | ≤2013 |
| Bank OF America CORP /DE/ | 3.75M | 1.00% | $245.6M | trimmed -20.5% | ≤2013 |
| Polar Capital Holdings PLC | 3.61M | 0.96% | $236.5M | trimmed -2.2% | 2025 Q1 |
| Nuveen | 3.38M | 0.90% | $221.5M | trimmed -15.5% | 2020 Q4 |
| Northern Trust | 3.37M | 0.90% | $220.9M | added +5.5% | ≤2013 |
| BNP Paribas Financial Markets | 3.09M | 0.82% | $202.3M | added +447.4% | ≤2013 |
| Charles Schwab Investment Management | 2.67M | 0.71% | $174.9M | added +2.8% | ≤2013 |
| Earnest Partners LLC | 2.63M | 0.70% | $172.2M | trimmed -8.7% | 2013 Q4 |
| Morgan Stanley | 2.62M | 0.70% | $171.6M | trimmed -11.1% | ≤2013 |
| BNY Mellon | 2.51M | 0.67% | $164.5M | trimmed -6% | ≤2013 |
| SEI Investments CO | 2.23M | 0.59% | $146.1M | added +52.2% | 2015 Q1 |
| Franklin Resources | 2.22M | 0.59% | $145.6M | added +15.6% | ≤2013 |
| AllianceBernstein | 2.17M | 0.58% | $141.9M | trimmed -27.2% | ≤2013 |
| LSV Asset Management | 2.03M | 0.54% | $132.6M | trimmed -45.9% | 2021 Q4 |
| KBC Group NV | 1.97M | 0.52% | $128.7M | added +541.5% | 2023 Q4 |
| Legal & General Group PLC | 1.96M | 0.52% | $128.2M | trimmed -16.3% | ≤2013 |
| Amundi | 1.49M | 0.40% | $97.9M | added +15.5% | 2017 Q4 |
| American Century Companies INC | 1.44M | 0.38% | $94.4M | unchanged | 2019 Q4 |
| Allianz Asset Management GmbH | 1.29M | 0.34% | $84.2M | trimmed -33.9% | 2019 Q3 |
| Cookson Peirce & CO INC | 1.19M | 0.32% | $77.6M | trimmed -2.7% | 2023 Q1 |
| T. Rowe Price | 1.17M | 0.31% | $76.7M | added +34.3% | 2023 Q1 |
| LPL Financial LLC | 1.17M | 0.31% | $76.6M | trimmed -9.5% | ≤2013 |
| NEW York State Common Retirement Fund | 1.15M | 0.30% | $75.2M | trimmed -16.5% | 2019 Q1 |
| Swiss National Bank | 1.09M | 0.29% | $71.1M | added +5.9% | ≤2013 |
| Envestnet Asset Management INC | 1.08M | 0.29% | $70.7M | unchanged | ≤2013 |
| Deutsche Bank AG\ | 1.08M | 0.29% | $70.6M | added +29.5% | 2013 Q3 |
| DekaBank Deutsche Girozentrale | 1.07M | 0.28% | $69.9M | unchanged | ≤2013 |
| Balyasny Asset Management | 1.06M | 0.28% | $69.3M | added +65.3% | 2015 Q4 |
| Wells Fargo & COMPANY/MN | 1.03M | 0.28% | $67.7M | added +5.3% | ≤2013 |
| Rhumbline Advisers | 1.03M | 0.27% | $67.6M | added +1.4% | 2022 Q1 |
| Squarepoint Ops LLC | 1.02M | 0.27% | $66.6M | opened | 2023 Q1 |
| Man Group | 1.00M | 0.27% | $65.5M | added +24.6% | 2020 Q3 |
| Park West Asset Management LLC (focused) | 991.5k | 0.26% | $64.9M | added +1% | 2022 Q3 |
| Voloridge Investment Management | 935.0k | 0.25% | $61.2M | added +3% | 2025 Q2 |
| Sound Shore Management INC /CT/ (focused) | 924.9k | 0.25% | $60.6M | trimmed -9.2% | 2020 Q3 |
| National Pension Service | 917.8k | 0.24% | $60.1M | added +47.7% | 2025 Q4 |
Largest 50 of 763 shown; the full ranked, searchable register is at boothcheck.com/holders/FLEX. 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.