Altair Engineering Inc.
ALTRDelisted Mar 26, 2025- Industry
- Services-Prepackaged Software
- SEC CIK
- 0001701732
Altair Engineering Inc. was delisted on Mar 26, 2025; its insiders filed their last Form 4 on Mar 26, 2025; 298 institutions reported holding it in 13F filings for Q4 2024, worth $6.27B in total; ARK Invest was the only superinvestor holding it.
Holders of 5% or more of ALTR
Holders whose latest Schedule 13D or 13G filing reports 5% or more of Altair Engineering Inc., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| BlackRock, Inc. | 13G/A | 12.50%7.48M shares | – | Feb 5, 20251 filing | Feb 5, 2025 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
4 Schedule 13D and 13G filings on Altair Engineering Inc., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Apr 7, 20254:15 PM ET | Matrix Capital Management Company, LPand 1 other | 13G/A | 0.00%0 shares | –Below 5% | Mar 31, 2025 | SEC |
| Mar 26, 20256:31 PM ET | Scapa James Ralphand 2 others | 13G/A | 0.00%0 shares | –Below 5% | Mar 26, 2025 | SEC |
| Mar 26, 20255:10 PM ET | Christ George Jand 2 others | 13G/A | 0.00%0 shares | –Below 5% | Mar 26, 2025 | SEC |
| Feb 5, 20251:23 PM ET | BlackRock, Inc. | 13G/A | 12.50%7.48M shares | – | Dec 31, 2024 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell Altair Engineering Inc. shares.
No Form 144 notices for Altair Engineering Inc. are on file.