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Altair Engineering Inc. (ALTR) institutional ownership

Market cap$9.6B SectorTechnology
Funds holding · Q4 2025
1
reported ALTR position changes
Top owners · Q1 2026
No disclosed owners are available.
Institutional activity · Q4 2025
Activity unavailable N/A
0 buyers · 1 sellers

Altair Engineering Inc. (ALTR) price and institutional activity

Dates

Q4 2025

$0 bought by 0 investors
$0 sold by 1 investors
Barclays PLC
Bought Sold Totals per quarter; hover a bar for the names.

Altair Engineering Inc. (ALTR) institutional activity · 1

Investor Type Est. change Change Δ Own Date
Barclays PLC · Exited
Change −105K Δ Own −100.0% Date Q4 2025
Barclays PLC Exited· Q4 2025 −105K −100.0% Q4 2025
Data through Q4 2025 · filed Mar 19, 2026
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Famous investor activity in Altair Engineering Inc. (ALTR)

Altair Engineering Inc. (ALTR) activist and large shareholders

Dates
Owner/Filer identity Shares reported % of shares outstanding Filing date
Scapa James Ralph 17.1M
% of shares outstanding 22.3% Filing date Nov 8, 2024
Scapa James Ralph 17.1M 22.3% Nov 8, 2024
Matrix Capital Management Company, LP 12.4M
% of shares outstanding 20.9% Filing date Nov 13, 2024
Matrix Capital Management Company, LP 12.4M 20.9% Nov 13, 2024
Christ George J 9.5M
% of shares outstanding 13.9% Filing date Nov 8, 2024
Christ George J 9.5M 13.9% Nov 8, 2024
BlackRock Inc. 7.9M
% of shares outstanding 13.8% Filing date Jul 8, 2024
BlackRock Inc. 7.9M 13.8% Jul 8, 2024
Vanguard Group Inc 5.8M
% of shares outstanding 10.6% Filing date Feb 13, 2024
Vanguard Group Inc 5.8M 10.6% Feb 13, 2024
Pictet Asset Management SA 2.3M
% of shares outstanding 3.8% Filing date Nov 21, 2024
Pictet Asset Management SA 2.3M 3.8% Nov 21, 2024
Matrix Capital Management Company, LP 0
% of shares outstanding 0.0% Filing date Apr 7, 2025
Matrix Capital Management Company, LP 0 0.0% Apr 7, 2025
Scapa James Ralph 0
% of shares outstanding 0.0% Filing date Mar 26, 2025
Scapa James Ralph 0 0.0% Mar 26, 2025
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Altair Engineering Inc. (ALTR) ownership FAQ

Who owns ALTR?

1 reporting institutions disclosed ALTR position changes in the Q4 2025 snapshot.

How is institutional activity calculated?

For each manager, WhoBought compares accepted consecutive 13F share counts. Share change is current shares minus prior shares. Estimated dollar change is that signed share change multiplied by the split-adjusted quarter-mean close. The activity table on this page uses Q4 2025.

What are activist and large shareholder filings?

An investor crossing 5% of a share class generally files Schedule 13D for activist intent or Schedule 13G for a passive position. The technical form names appear here rather than in the activity rows.

Where does this data come from?

Ownership and institutional activity come from SEC Form 13F filings. Insider activity comes from SEC Form 4, and large-shareholder activity from SEC Schedules 13D and 13G. FMP supplies price data only. Company logos use the local verified Parqet cache with one shared fallback.

Why are ownership reports delayed?

Form 13F is a quarterly disclosure and is normally filed after the quarter ends. Every ownership and activity value therefore names its represented period; it is not presented as a live position.

How are missing table values shown?

A muted dash marks a missing table value. It means the filing omitted the value, comparable data is unavailable, or no prior position exists for comparison.