Mailing Address 1820 E. BIG BEAVER ROAD TROY MI 48083
Business Address 1820 E. BIG BEAVER ROAD TROY MI 48083 248-614-2400
Altair Engineering Inc. CIK#: 0001701732 (see all company filings)

SIC: 7372 - SERVICES-PREPACKAGED SOFTWARE
State location: MI | State of Inc.: DE | Fiscal Year End: 1231
(CF Office: 06 Technology)
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Items 1 - 40  0001701732 Filings RSS Feed
Filings Format Description Filing Date File/Film Number
SCHEDULE 13G/A  Documents [Amend] Statement of Beneficial Ownership by Certain Investors
Acc-no: 0000902664-25-001703 (34 Act)  Size: 9 KB
2025-04-07 005-90370
25818295
15-12G  Documents Securities registration termination [Section 12(g)]
Acc-no: 0001193125-25-074144 (34 Act)  Size: 10 KB
2025-04-07 001-38263
25816555
8-K  Documents   Interactive Data Current report, items 1.01, 1.02, 2.01, 2.04, 3.01, 3.03, 5.01, 5.02, 5.03, and 9.01
Acc-no: 0001193125-25-066329 (34 Act)  Size: 322 KB
2025-03-28 001-38263
25781599
SCHEDULE 13G/A  Documents [Amend] Statement of Beneficial Ownership by Certain Investors
Acc-no: 0000950170-25-045545 (34 Act)  Size: 11 KB
2025-03-26 005-90370
25774669
SCHEDULE 13G/A  Documents [Amend] Statement of Beneficial Ownership by Certain Investors
Acc-no: 0000950170-25-045435 (34 Act)  Size: 10 KB
2025-03-26 005-90370
25774235
S-8 POS  Documents Securities to be offered to employees in employee benefit plans, post-effective amendments
Acc-no: 0001193125-25-064072 (33 Act)  Size: 29 KB
2025-03-26 333-221312
25773250
S-8 POS  Documents Securities to be offered to employees in employee benefit plans, post-effective amendments
Acc-no: 0001193125-25-064070 (33 Act)  Size: 29 KB
2025-03-26 333-236814
25773228
S-8 POS  Documents Securities to be offered to employees in employee benefit plans, post-effective amendments
Acc-no: 0001193125-25-064066 (33 Act)  Size: 29 KB
2025-03-26 333-223833
25773188
S-8 POS  Documents Securities to be offered to employees in employee benefit plans, post-effective amendments
Acc-no: 0001193125-25-064059 (33 Act)  Size: 29 KB
2025-03-26 333-230019
25773125
S-8 POS  Documents Securities to be offered to employees in employee benefit plans, post-effective amendments
Acc-no: 0001193125-25-064047 (33 Act)  Size: 29 KB
2025-03-26 333-255157
25773098
S-8 POS  Documents Securities to be offered to employees in employee benefit plans, post-effective amendments
Acc-no: 0001193125-25-064043 (33 Act)  Size: 29 KB
2025-03-26 333-255160
25773056
S-8 POS  Documents Securities to be offered to employees in employee benefit plans, post-effective amendments
Acc-no: 0001193125-25-064040 (33 Act)  Size: 29 KB
2025-03-26 333-263122
25773029
S-8 POS  Documents Securities to be offered to employees in employee benefit plans, post-effective amendments
Acc-no: 0001193125-25-064035 (33 Act)  Size: 29 KB
2025-03-26 333-277284
25773017
POSASR  Documents Post-effective Amendment to an automatic shelf registration statement
Acc-no: 0001193125-25-064020 (33 Act)  Size: 20 KB
2025-03-26 333-266587
25773001
25-NSE  Documents Notification filed by national security exchange to report the removal from listing and registration of matured, redeemed or retired securities
Acc-no: 0001354457-25-000243 (34 Act)  Size: 3 KB
2025-03-26 001-38263
25770891
10-K/A  Documents   Interactive Data [Amend] Annual report [Section 13 and 15(d), not S-K Item 405]
Acc-no: 0001193125-25-062603 (34 Act)  Size: 1 MB
2025-03-25 001-38263
25768827
10-K  Documents   Interactive Data Annual report [Section 13 and 15(d), not S-K Item 405]
Acc-no: 0000950170-25-024197 (34 Act)  Size: 19 MB
2025-02-20 001-38263
25645827
8-K  Documents   Interactive Data Current report, items 2.02 and 9.01
Acc-no: 0000950170-25-024159 (34 Act)  Size: 1 MB
2025-02-20 001-38263
25645527
SCHEDULE 13G/A  Documents [Amend] Statement of Beneficial Ownership by Certain Investors
Acc-no: 0002012383-25-001263 (34 Act)  Size: 12 KB
2025-02-05 005-90370
25592260
8-K  Documents   Interactive Data Current report, items 5.07, 8.01, and 9.01
Acc-no: 0001193125-25-010386 (34 Act)  Size: 167 KB
2025-01-22 001-38263
25546184
DEFA14A  Documents Additional definitive proxy soliciting materials and Rule 14(a)(12) material
Acc-no: 0001193125-25-007737 (34 Act)  Size: 61 KB
2025-01-16 001-38263
25536117
8-K  Documents   Interactive Data Current report, item 8.01
Acc-no: 0001193125-25-007735 (34 Act)  Size: 203 KB
2025-01-16 001-38263
25536087
DEFM14A  Documents Definitive proxy statement relating to merger or acquisition
Acc-no: 0001193125-24-281324 (34 Act)  Size: 2 MB
2024-12-18 001-38263
241559682
PREM14A  Documents   Interactive Data Preliminary proxy statements relating to merger or acquisition
Acc-no: 0001193125-24-270781 (34 Act)  Size: 2 MB
2024-12-04 001-38263
241526945
DEFA14A  Documents Additional definitive proxy soliciting materials and Rule 14(a)(12) material
Acc-no: 0001193125-24-263503 (34 Act)  Size: 30 KB
2024-11-21 001-38263
241485579
SC 13G  Documents Statement of Beneficial Ownership by Certain Investors
Acc-no: 0001193125-24-262941 (34 Act)  Size: 37 KB
2024-11-21 005-90370
241482058
DEFA14A  Documents Additional definitive proxy soliciting materials and Rule 14(a)(12) material
Acc-no: 0001193125-24-261775 (34 Act)  Size: 49 KB
2024-11-19 001-38263
241476853
SC 13G/A  Documents [Amend] Statement of Beneficial Ownership by Certain Investors
Acc-no: 0000902664-24-006450 (34 Act)  Size: 61 KB
2024-11-13 005-90370
241451469
SC 13G/A  Documents [Amend] Statement of Beneficial Ownership by Certain Investors
Acc-no: 0001193125-24-254205 (34 Act)  Size: 67 KB
2024-11-08 005-90370
241441390
SC 13G/A  Documents [Amend] Statement of Beneficial Ownership by Certain Investors
Acc-no: 0001193125-24-254192 (34 Act)  Size: 85 KB
2024-11-08 005-90370
241441241
DEFA14A  Documents Additional definitive proxy soliciting materials and Rule 14(a)(12) material
Acc-no: 0001193125-24-253667 (34 Act)  Size: 2 MB
2024-11-08 001-38263
241437847
DEFA14A  Documents Additional definitive proxy soliciting materials and Rule 14(a)(12) material
Acc-no: 0001193125-24-253346 (34 Act)  Size: 51 KB
2024-11-08 001-38263
241437357
DEFA14A  Documents Additional definitive proxy soliciting materials and Rule 14(a)(12) material
Acc-no: 0001193125-24-252754 (34 Act)  Size: 21 KB
2024-11-07 001-38263
241433589
DEFA14A  Documents Additional definitive proxy soliciting materials and Rule 14(a)(12) material
Acc-no: 0001193125-24-250703 (34 Act)  Size: 21 KB
2024-11-04 001-38263
241424682
DEFA14A  Documents Additional definitive proxy soliciting materials and Rule 14(a)(12) material
Acc-no: 0001193125-24-248529 (34 Act)  Size: 151 KB
2024-10-31 001-38263
241414713
10-Q  Documents   Interactive Data Quarterly report [Sections 13 or 15(d)]
Acc-no: 0000950170-24-119474 (34 Act)  Size: 10 MB
2024-10-31 001-38263
241414699
DEFA14A  Documents Additional definitive proxy soliciting materials and Rule 14(a)(12) material
Acc-no: 0001193125-24-248170 (34 Act)  Size: 23 KB
2024-10-31 001-38263
241412511
DFAN14A  Documents Additional definitive proxy soliciting materials filed by non-management and Rule 14(a)(12) material
Acc-no: 0001193125-24-247675 (34 Act)  Size: 7 MB
2024-10-30 001-38263
241411568
DFAN14A  Documents Additional definitive proxy soliciting materials filed by non-management and Rule 14(a)(12) material
Acc-no: 0001193125-24-247672 (34 Act)  Size: 47 KB
2024-10-30 001-38263
241411540
DEFA14A  Documents Additional definitive proxy soliciting materials and Rule 14(a)(12) material
Acc-no: 0001193125-24-247638 (34 Act)  Size: 273 KB
2024-10-30 001-38263
241411125