Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
338 institutional managers reported holding IESC for the quarter ended Mar 31, 2026. Together they hold about 95% of shares outstanding; the top 10 hold 79%. 52 opened new positions; 52 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| Gendell Jeffrey L | 10.34M | 51.22% | $4.93B | unchanged | ≤2013 |
| FMR (Fidelity) | 2.37M | 11.75% | $1.13B | added +17.6% | 2020 Q1 |
| Vanguard Group | 868.7k | 4.30% | $414.4M | added +1.7% | ≤2013 |
| BlackRock | 709.6k | 3.52% | $338.5M | trimmed -1.8% | ≤2013 |
| Dimensional Fund Advisors | 457.9k | 2.27% | $218.5M | unchanged | ≤2013 |
| First Trust Advisors LP | 349.2k | 1.73% | $166.6M | added +40.4% | 2023 Q4 |
| Geode Capital | 295.8k | 1.47% | $141.1M | added +7.7% | ≤2013 |
| Pertento Partners LLP (focused) | 231.2k | 1.15% | $110.3M | added +10.5% | 2025 Q2 |
| State Street | 207.5k | 1.03% | $99.0M | added +0.8% | 2016 Q2 |
| UBS | 194.7k | 0.96% | $92.9M | added +86.2% | 2013 Q3 |
| Morgan Stanley | 177.6k | 0.88% | $84.7M | added +3.6% | 2013 Q3 |
| Franklin Resources | 165.2k | 0.82% | $78.8M | added +7.3% | 2023 Q2 |
| Arrowstreet Capital | 156.4k | 0.78% | $74.6M | trimmed -5.1% | 2023 Q1 |
| Thrivent Financial for Lutherans | 152.7k | 0.76% | $72.8M | unchanged | 2024 Q3 |
| Royce & Associates | 149.0k | 0.74% | $71.1M | trimmed -13% | ≤2013 |
| AltraVue Capital, LLC (focused) | 129.8k | 0.64% | $61.9M | trimmed -9% | 2018 Q4 |
| Parsifal Capital Management, LP (focused) | 90.1k | 0.45% | $43.0M | trimmed -10.1% | 2025 Q3 |
| Charles Schwab Investment Management | 83.5k | 0.41% | $39.8M | added +2.5% | 2016 Q2 |
| Renaissance Technologies | 82.4k | 0.41% | $39.3M | trimmed -15.4% | ≤2013 |
| American Century Companies INC | 80.5k | 0.40% | $38.4M | trimmed -14.8% | 2023 Q3 |
| Invesco | 77.7k | 0.39% | $37.1M | trimmed -15.3% | 2020 Q3 |
| Northern Trust | 76.9k | 0.38% | $36.7M | added +2.7% | ≤2013 |
| Lord, Abbett & CO. LLC | 72.4k | 0.36% | $34.5M | trimmed -16.8% | 2025 Q1 |
| Goldman Sachs | 68.7k | 0.34% | $32.8M | trimmed -23% | 2020 Q4 |
| T. Rowe Price | 62.2k | 0.31% | $29.7M | added +2.3% | 2024 Q1 |
| Ophir Asset Management Pty LTD (focused) | 55.0k | 0.27% | $26.3M | trimmed -7.6% | 2024 Q1 |
| Swedbank Robur | 54.0k | 0.27% | $25.8M | trimmed -16.9% | 2025 Q2 |
| LPL Financial LLC | 48.0k | 0.24% | $22.9M | trimmed -7.1% | 2024 Q2 |
| United Capital Management of KS, INC. | 44.5k | 0.22% | $21.2M | trimmed -1.7% | 2025 Q2 |
| Congress Asset Management CO | 43.5k | 0.22% | $20.8M | added +27% | 2025 Q2 |
| Segall Bryant & Hamill, LLC | 40.1k | 0.20% | $19.1M | added +196.4% | 2025 Q4 |
| Neuberger Berman Group LLC | 40.0k | 0.20% | $19.1M | trimmed -19.8% | 2017 Q4 |
| Deutsche Bank AG\ | 39.0k | 0.19% | $18.6M | added +2.3% | 2015 Q2 |
| Bank OF America CORP /DE/ | 33.8k | 0.17% | $16.1M | added +33.1% | ≤2013 |
| NEW York State Common Retirement Fund | 33.2k | 0.17% | $15.9M | trimmed -7.3% | 2016 Q2 |
| Kennedy Capital Management LLC | 33.0k | 0.16% | $15.8M | trimmed -3.1% | 2021 Q3 |
| BNY Mellon | 31.1k | 0.15% | $14.8M | trimmed -4.7% | ≤2013 |
| Raymond James Financial INC | 27.7k | 0.14% | $13.2M | trimmed -3.5% | 2024 Q1 |
| Legato Capital Management LLC | 27.5k | 0.14% | $13.1M | trimmed -9.5% | 2023 Q2 |
| Ameriprise Financial INC | 26.6k | 0.13% | $12.7M | added +14% | 2021 Q3 |
| Man Group | 26.6k | 0.13% | $12.7M | added +117.3% | 2024 Q4 |
| Bridgewater Associates | 22.2k | 0.11% | $10.6M | trimmed -4.2% | 2025 Q3 |
| Ethic INC. | 21.7k | 0.11% | $10.3M | opened | 2026 Q1 |
| Renaissance Group LLC | 21.6k | 0.11% | $10.3M | added +34.7% | 2025 Q4 |
| AQR Capital | 21.6k | 0.11% | $10.3M | added +4.5% | 2023 Q2 |
| Prudential Financial INC | 21.3k | 0.10% | $10.1M | trimmed -17.8% | 2025 Q2 |
| Nuveen | 19.9k | 0.10% | $9.5M | trimmed -16.6% | 2019 Q2 |
| Susquehanna International Group | 18.7k | 0.09% | $8.9M | added +18.3% | 2022 Q4 |
| Victory Capital Management INC | 18.5k | 0.09% | $8.8M | added +50.1% | 2023 Q4 |
| Steamboat Capital Partners, LLC | 18.0k | 0.09% | $8.6M | trimmed -0.6% | 2024 Q2 |
Largest 50 of 338 shown; the full ranked, searchable register is at boothcheck.com/holders/IESC. 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.