| SC 13G/A | 2024-02-09 | DIMENSIONAL FUND ADVISORS LP | Perma-Pipe International Holdings, Inc. | 444,985 | 5.5% | EDGAR |
| SC 13G/A | 2023-02-10 | DIMENSIONAL FUND ADVISORS LP | Perma-Pipe International Holdings, Inc. | 494,361 | 6.2% | EDGAR |
| SC 13G/A | 2022-02-10 | VANGUARD GROUP INC | Perma-Pipe International Holdings, Inc. | 342,184 | 4.2% | EDGAR |
| SC 13G/A | 2022-02-10 | VANGUARD INDEX FUNDS | Perma-Pipe International Holdings, Inc. | 342,184 | 4.2% | EDGAR |
| SC 13G/A | 2022-02-08 | DIMENSIONAL FUND ADVISORS LP | Perma-Pipe International Holdings, Inc. | 473,149 | 5.9% | EDGAR |
| SC 13G/A | 2021-02-16 | DIMENSIONAL FUND ADVISORS LP | Perma-Pipe International Holdings, Inc. | 552,044 | 6.8% | EDGAR |
| SC 13G/A | 2021-02-10 | VANGUARD GROUP INC | Perma-Pipe International Holdings, Inc. | 543,193 | 6.6% | EDGAR |
| SC 13G/A | 2021-02-08 | VANGUARD INDEX FUNDS | Perma-Pipe International Holdings, Inc. | 471,899 | 5.8% | EDGAR |
| SC 13G/A | 2020-02-14 | CANNELL CAPITAL LLC | Perma-Pipe International Holdings, Inc. | 600,396 | 7.4% | EDGAR |
| SC 13G/A | 2020-02-12 | DIMENSIONAL FUND ADVISORS LP | Perma-Pipe International Holdings, Inc. | 551,540 | 6.9% | EDGAR |
| SC 13G | 2020-02-12 | VANGUARD INDEX FUNDS | Perma-Pipe International Holdings, Inc. | 465,028 | 5.8% | EDGAR |
| SC 13G | 2020-02-11 | VANGUARD GROUP INC | Perma-Pipe International Holdings, Inc. | 536,322 | 6.7% | EDGAR |
| SC 13G | 2020-02-04 | WELLS FARGO & COMPANY/MN | Perma-Pipe International Holdings, Inc. | 1,000 | 0.0% | EDGAR |
| SC 13G/A | 2019-02-14 | CANNELL CAPITAL LLC | Perma-Pipe International Holdings, Inc. | 699,207 | 8.9% | EDGAR |
| SC 13G/A | 2019-02-08 | DIMENSIONAL FUND ADVISORS LP | Perma-Pipe International Holdings, Inc. | 561,284 | 7.1% | EDGAR |
| SC 13G/A | 2019-01-22 | WELLS FARGO & COMPANY/MN | Perma-Pipe International Holdings, Inc. | 565,420 | 7.2% | EDGAR |
| SC 13G | 2018-02-14 | CANNELL CAPITAL LLC | Perma-Pipe International Holdings, Inc. | 488,109 | 6.3% | EDGAR |
| SC 13G/A | 2018-02-09 | DIMENSIONAL FUND ADVISORS LP | Perma-Pipe International Holdings, Inc. | 559,416 | 7.2% | EDGAR |
| SC 13G | 2018-01-30 | WELLS FARGO & COMPANY/MN | Perma-Pipe International Holdings, Inc. | 470,837 | 6.1% | EDGAR |
| SC 13G/A | 2017-04-10 | WELLS FARGO & COMPANY/MN | Perma-Pipe International Holdings, Inc. | 141,500 | 1.9% | EDGAR |