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ALLIANCEBERNSTEIN L.P.
> ALTR
| Date | Name | Ticker | Shares | Change | Value | Change | Price |
| 06/30/2023 | Altair Engineering Inc. | ALTR | 1,523,120 | 120,401 | 115,513,421,000 | 14,363,354,000 | $75,840.00 |
| 03/31/2023 | Altair Engineering Inc. | ALTR | 1,402,719 | 1,341,623 | 101,150,067,000 | 98,372,032,000 | $72,110.00 |
| 12/31/2022 | Altair Engineering Inc. | ALTR | 61,096 | -78 | 2,778,035,000 | 2,775,330,000 | $45,470.00 |
| 09/30/2022 | Altair Engineering Inc. | ALTR | 61,174 | 65 | 2,705,000 | -503,000 | $44.22 |
| 06/30/2022 | Altair Engineering Inc. | ALTR | 61,109 | 5,090 | 3,208,000 | -400,000 | $52.50 |
| 03/31/2022 | Altair Engineering Inc. | ALTR | 56,019 | 226 | 3,608,000 | -706,000 | $64.41 |
| 12/31/2021 | Altair Engineering Inc. | ALTR | 55,793 | -167 | 4,314,000 | 456,000 | $77.32 |
| 09/30/2021 | Altair Engineering Inc. | ALTR | 55,960 | 0 | 3,858,000 | -2,000 | $68.94 |
| 06/30/2021 | Altair Engineering Inc. | ALTR | 55,960 | -600 | 3,860,000 | 321,000 | $68.98 |
| 03/31/2021 | Altair Engineering Inc. | ALTR | 56,560 | -2,100 | 3,539,000 | 126,000 | $62.57 |
| 12/31/2020 | Altair Engineering Inc. | ALTR | 58,660 | -5,750 | 3,413,000 | 709,000 | $58.18 |
| 09/30/2020 | Altair Engineering Inc. | ALTR | 64,410 | -1,650 | 2,704,000 | 78,000 | $41.98 |
| 06/30/2020 | Altair Engineering Inc. | ALTR | 66,060 | 6,300 | 2,626,000 | 1,042,000 | $39.75 |
| 03/31/2020 | Altair Engineering Inc. | ALTR | 59,760 | -680 | 1,584,000 | -586,000 | $26.51 |
| 12/31/2019 | Altair Engineering Inc. | ALTR | 60,440 | -591,006 | 2,170,000 | -20,383,000 | $35.90 |
| 09/30/2019 | Altair Engineering Inc. | ALTR | 651,446 | -757,498 | 22,553,000 | -34,354,000 | $34.62 |
| 06/30/2019 | Altair Engineering Inc. | ALTR | 1,408,944 | 33,241 | 56,907,000 | 6,267,000 | $40.39 |
| 03/31/2019 | Altair Engineering Inc. | ALTR | 1,375,703 | -143,884 | 50,640,000 | 8,730,000 | $36.81 |
| 12/31/2018 | Altair Engineering Inc. | ALTR | 1,519,587 | 61,985 | 41,910,000 | -21,423,000 | $27.58 |
| 09/30/2018 | Altair Engineering Inc. | ALTR | 1,457,602 | 1,307,332 | 63,333,000 | 58,197,000 | $43.45 |
| 06/30/2018 | Altair Engineering Inc. | ALTR | 150,270 | 150,270 | 5,136,000 | 5,136,000 | $34.18 |
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