NWPX - CIK 0001001385
NORTHWEST PIPE CO has filed 1,361 documents with the SEC between 1996 and 2026. The most frequent type is insider trade (589 filings), alongside the regular cadence of annual reports, quarterly reports, and event disclosures every public company must make. Use the filters to focus on one filing type, or flip the sort to trace the company's history from its earliest paperwork.
Data parsed from SEC EDGAR XBRL filings. See the full market cap rankings.
| Filing | Type | Filed | Period covered |
|---|---|---|---|
| 10-K405 | - | 2000-03-22 | 1999-12-31 |
| Passive ownership stake | SC 13G | 2000-02-16 | - |
| Passive ownership stake | SC 13G | 2000-02-15 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-02-15 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-02-15 | - |
| Passive ownership stake | SC 13G | 2000-02-14 | - |
| Passive ownership stake | SC 13G | 2000-02-03 | - |
| Passive ownership stake (update) | SC 13G/A | 2000-01-31 | - |
| Passive ownership stake | SC 13G | 2000-01-28 | - |
| Quarterly report | 10-Q | 1999-11-08 | 1999-09-30 |
| Employee stock plan | S-8 | 1999-10-29 | - |
| Quarterly report | 10-Q | 1999-08-02 | 1999-06-30 |
| 8-A12G | - | 1999-07-01 | - |
| Major company event | 8-K | 1999-07-01 | 1999-06-28 |
| Quarterly report | 10-Q | 1999-05-07 | 1999-03-31 |
| Proxy statement | DEF 14A | 1999-04-09 | 1999-05-11 |
| 10-K405 | - | 1999-03-30 | 1998-12-31 |
| Passive ownership stake | SC 13G | 1999-02-16 | - |
| Passive ownership stake | SC 13G | 1999-02-12 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-02-11 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-02-11 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-02-08 | - |
| Passive ownership stake (update) | SC 13G/A | 1999-02-08 | - |
| Passive ownership stake | SC 13G | 1999-02-01 | - |
| Quarterly report | 10-Q | 1998-11-06 | 1998-09-30 |
| Employee stock plan | S-8 | 1998-09-23 | - |
| Major company event (amended) | 8-K/A | 1998-08-24 | 1998-03-06 |
| Quarterly report | 10-Q | 1998-08-14 | 1998-06-30 |
| Quarterly report | 10-Q | 1998-05-15 | 1998-03-31 |
| Major company event (amended) | 8-K/A | 1998-05-15 | 1998-03-06 |
| Proxy statement | DEF 14A | 1998-04-15 | 1998-05-19 |
| 10-K405 | - | 1998-03-27 | 1997-12-31 |
| Major company event | 8-K | 1998-03-20 | 1998-03-06 |
| Passive ownership stake | SC 13G | 1998-02-13 | - |
| Passive ownership stake (update) | SC 13G/A | 1998-02-12 | - |
| Passive ownership stake (update) | SC 13G/A | 1998-02-12 | - |
| Passive ownership stake | SC 13G | 1998-02-12 | - |
| Passive ownership stake | SC 13G | 1998-02-10 | - |
| Quarterly report | 10-Q | 1997-11-10 | 1997-09-30 |
| Quarterly report | 10-Q | 1997-08-12 | 1997-06-30 |
| Quarterly report | 10-Q | 1997-05-08 | 1997-03-31 |
| Proxy statement | DEF 14A | 1997-04-15 | 1997-05-22 |
| Annual report | 10-K | 1997-03-26 | 1996-12-31 |
| Passive ownership stake | SC 13G | 1997-02-13 | - |
| Passive ownership stake (update) | SC 13G/A | 1997-02-12 | - |
| Passive ownership stake | SC 13G | 1997-02-11 | - |
| Passive ownership stake | SC 13G | 1997-02-11 | - |
| Passive ownership stake (update) | SC 13G/A | 1997-02-11 | - |
| Passive ownership stake | SC 13G | 1997-02-10 | - |
| Employee stock plan | S-8 | 1997-01-22 | - |