| SC 13D/A | 2024-02-14 | POWELL THOMAS W | POWELL INDUSTRIES INC | 2,454,277 | 20.5% | EDGAR |
| SC 13G/A | 2024-02-13 | VANGUARD GROUP INC | POWELL INDUSTRIES INC | 639,251 | 5.4% | EDGAR |
| SC 13G/A | 2024-02-09 | DIMENSIONAL FUND ADVISORS LP | POWELL INDUSTRIES INC | 807,985 | 6.8% | EDGAR |
| SC 13G/A | 2024-01-23 | BlackRock Inc. | POWELL INDUSTRIES INC | 1,452,142 | 12.1% | EDGAR |
| SC 13G/A | 2023-02-10 | DIMENSIONAL FUND ADVISORS LP | POWELL INDUSTRIES INC | 786,158 | 6.7% | EDGAR |
| SC 13G/A | 2023-02-09 | VANGUARD GROUP INC | POWELL INDUSTRIES INC | 602,928 | 5.1% | EDGAR |
| SC 13G/A | 2023-01-23 | BlackRock Inc. | POWELL INDUSTRIES INC | 1,465,213 | 12.4% | EDGAR |
| SC 13G/A | 2022-02-10 | VANGUARD GROUP INC | POWELL INDUSTRIES INC | 595,329 | 5.1% | EDGAR |
| SC 13G/A | 2022-02-08 | DIMENSIONAL FUND ADVISORS LP | POWELL INDUSTRIES INC | 798,922 | 6.8% | EDGAR |
| SC 13G/A | 2022-02-07 | BlackRock Inc. | POWELL INDUSTRIES INC | 1,459,707 | 12.5% | EDGAR |
| SC 13G/A | 2021-02-16 | DIMENSIONAL FUND ADVISORS LP | POWELL INDUSTRIES INC | 900,337 | 7.7% | EDGAR |
| SC 13G/A | 2021-02-11 | RENAISSANCE TECHNOLOGIES LLC | POWELL INDUSTRIES INC | 541,035 | 4.6% | EDGAR |
| SC 13G | 2021-02-10 | VANGUARD GROUP INC | POWELL INDUSTRIES INC | 593,736 | 5.1% | EDGAR |
| SC 13G/A | 2021-01-27 | BlackRock Inc. | POWELL INDUSTRIES INC | 1,422,390 | 12.2% | EDGAR |
| SC 13G/A | 2020-02-12 | VANGUARD GROUP INC | POWELL INDUSTRIES INC | 568,936 | 4.9% | EDGAR |
| SC 13G/A | 2020-02-12 | DIMENSIONAL FUND ADVISORS LP | POWELL INDUSTRIES INC | 944,217 | 8.2% | EDGAR |
| SC 13G | 2020-02-12 | RENAISSANCE TECHNOLOGIES LLC | POWELL INDUSTRIES INC | 606,898 | 4.9% | EDGAR |
| SC 13G/A | 2020-02-04 | BlackRock Inc. | POWELL INDUSTRIES INC | 1,418,229 | 12.2% | EDGAR |
| SC 13G/A | 2020-02-03 | DEPRINCE RACE & ZOLLO INC | POWELL INDUSTRIES INC | 103,512 | 0.9% | EDGAR |
| SC 13G | 2019-02-12 | VANGUARD GROUP INC | POWELL INDUSTRIES INC | 587,534 | 5.1% | EDGAR |