| XNYS - New York Stock Exchange | Altair Engineering Inc. - ALTR |
| XNAS - NASDAQ | Altair Engineering Inc. - ALTR |
| XFRA - Frankfurt Stock Exchange | Altair Engineering Inc. - 8A2 |
| XDUS - Düsseldorf Stock Exchange | Altair Engineering Inc. - A2DYPC |
| XBER - Berlin Stock Exchange | Altair Engineering Inc. - 8A2 |
| XMUN - Munich Stock Exchange | Altair Engineering - A2DYPC |
| XSTU - Stuttgart Stock Exchange | Altair Engineering Inc. - 8A2 |