Matrix Capital Management Company LP 13D and 13G filings for Altair Engineering 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 |
| 2025-04-07 4:15 pm Sale | 2025-03-31 | 13G | Altair Engineering Inc. ALTR | Matrix Capital Management Company LP | 0 0.000% | -12,430,000 (Position Closed) | Filing |
| 2024-11-13 09:09 am Purchase | 2024-09-30 | 13G | Altair Engineering Inc. ALTR | Matrix Capital Management Company LP | 12,430,000 20.900% | 196,826 (+1.61%) | Filing |
| 2024-02-13 4:15 pm Purchase | 2023-12-31 | 13G | Altair Engineering Inc. ALTR | Matrix Capital Management Company LP | 12,233,174 22.400% | 1,362,174 (+12.53%) | Filing |
| 2023-02-13 4:05 pm Purchase | 2022-12-31 | 13G | Altair Engineering Inc. ALTR | Matrix Capital Management Company LP | 10,871,000 20.750% | 2,271,000 (+26.41%) | Filing |
| 2022-02-14 12:05 pm Purchase | 2021-12-31 | 13G | Altair Engineering Inc. ALTR | Matrix Capital Management Company LP | 8,600,000 16.930% | 3,444,975 (+66.83%) | Filing |
| 2021-02-16 10:00 am Purchase | 2020-12-31 | 13G | Altair Engineering Inc. ALTR | Matrix Capital Management Company LP | 5,155,025 11.920% | 2,762,300 (+115.45%) | Filing |