Wellington Management Group LLP 13D and 13G filings for ImmunoGen, Inc.:
- Schedule 13D must be filed within ten days after a person or an organization acquires beneficial ownership of more than 5% of a voting class of a company's equity securities.
- Shares have been adjusted for stock splits.
| Reported DateTime | Transaction Date | Type | Company Symbol | Filed By Symbol | Shares Owned % Owned | Shares Vs. Prev Report | View |
| 2023-02-06 2:53 pm Sale | 2022-12-30 | 13G | ImmunoGen, Inc. IMGN | Wellington Management Group LLP | 9,226,708 4.180% | -4,675,790 (-33.63%) | Filing |
| 2022-01-10 08:37 am Sale | 2021-12-31 | 13G | ImmunoGen, Inc. IMGN | Wellington Management Group LLP | 13,902,498 6.320% | -8,181,605 (-37.05%) | Filing |
| 2021-02-04 09:37 am Purchase | 2020-12-31 | 13G | ImmunoGen, Inc. IMGN | Wellington Management Group LLP | 22,084,103 11.340% | 3,981,879 (+22.00%) | Filing |