| Symbol | Company | Owner | Relationship | Date | Transaction | Cost | # Shares | Value ($) | Total Shares | Filing | |
|---|---|---|---|---|---|---|---|---|---|---|---|
| ALTR | Altair Engineering Inc. | GC Investments LLC | 10% Owner | Dec 08, 2023 | Sale | $71.58 | 4,564 | 326,688 | 0 | Dec 11, 2023, 09:10 AM | |
| ALTR | Altair Engineering Inc. | GC Investments LLC | 10% Owner | Dec 06, 2023 | Sale | $72.05 | 14,411 | 1,038,366 | 900 | Dec 08, 2023, 11:55 AM | |
| ALTR | Altair Engineering Inc. | GC Investments LLC | 10% Owner | Dec 01, 2023 | Sale | $72.79 | 45,766 | 3,331,165 | 0 | Dec 05, 2023, 02:58 PM | |
| ALTR | Altair Engineering Inc. | GC Investments LLC | 10% Owner | Nov 29, 2023 | Sale | $73.10 | 25,554 | 1,868,038 | 100 | Dec 01, 2023, 02:20 PM | |
| ALTR | Altair Engineering Inc. | GC Investments LLC | 10% Owner | Nov 30, 2023 | Sale | $72.65 | 1,128 | 81,949 | 0 | Dec 01, 2023, 02:20 PM | |
| ALTR | Altair Engineering Inc. | GC Investments LLC | 10% Owner | Nov 21, 2023 | Sale | $73.09 | 8,577 | 626,929 | 633 | Nov 22, 2023, 12:06 PM | |
| ALTR | Altair Engineering Inc. | GC Investments LLC | 10% Owner | Apr 13, 2023 | Sale | $71.34 | 50,000 | 3,566,900 | 0 | Apr 17, 2023, 08:40 AM | |
| ALTR | Altair Engineering Inc. | GC Investments LLC | 10% Owner | Apr 14, 2023 | Sale | $71.13 | 50,000 | 3,556,497 | 9,167 | Apr 17, 2023, 08:40 AM | |
| ALTR | Altair Engineering Inc. | GC Investments LLC | 10% Owner | Mar 14, 2023 | Sale | $66.02 | 50,182 | 3,312,964 | 15,430 | Mar 16, 2023, 09:04 AM | |
| ALTR | Altair Engineering Inc. | GC Investments LLC | 10% Owner | Mar 10, 2023 | Sale | $64.76 | 49,818 | 3,226,463 | 0 | Mar 14, 2023, 02:10 PM | |
| ALTR | Altair Engineering Inc. | GC Investments LLC | 10% Owner | Aug 01, 2019 | Sale | $41.37 | 7,235 | 299,319 | 0 | Aug 05, 2019, 08:09 PM | |
| ALTR | Altair Engineering Inc. | GC Investments LLC | 10% Owner | Aug 02, 2019 | Sale | $40.42 | 32,765 | 1,324,361 | 0 | Aug 05, 2019, 08:09 PM | |
| ALTR | Altair Engineering Inc. | GC Investments LLC | 10% Owner | Jul 12, 2019 | Sale | $41.44 | 6,989 | 289,617 | 0 | Jul 16, 2019, 04:59 PM | |
| ALTR | Altair Engineering Inc. | GC Investments LLC | 10% Owner | Jul 11, 2019 | Sale | $42.22 | 12,935 | 546,051 | 0 | Jul 15, 2019, 02:31 PM | |
| ALTR | Altair Engineering Inc. | GC Investments LLC | 10% Owner | Jul 10, 2019 | Sale | $42.21 | 20,076 | 847,368 | 0 | Jul 12, 2019, 08:21 AM | |
| ALTR | Altair Engineering Inc. | GC Investments LLC | 10% Owner | Jun 11, 2018 | Sale | $33.42 | 200,000 | 6,685,000 | 0 | Jun 11, 2018, 04:20 PM | |
| ALTR | Altair Engineering Inc. | GC Investments LLC | 10% Owner | Nov 03, 2017 | Sale | $12.09 | 1,200,000 | 14,508,000 | 0 | Jun 11, 2018, 04:11 PM | |
| ALTR | Altair Engineering Inc. | GC Investments LLC | 10% Owner | Nov 03, 2017 | Sale | $12.09 | 800,000 | 9,672,000 | 0 | Nov 03, 2017, 09:55 AM |
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