Comparable stake leader
BlackRock, Inc.
SEC ownership of Altair Engineering Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001701732.
Disclosed value leader
BlackRock, Inc.
Comparable rows
2/13
Latest evidence
31 Mar 2026
- Parsed ownership sources
-
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
BlackRock, Inc.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
2 of 13
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
BlackRock, Inc.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001701732
- Issuer location
- Troy, MI
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Altair Engineering Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
BlackRock, Inc.
Disclosed value leader
BlackRock, Inc.
Comparable rows
2/13
Latest evidence
31 Mar 2026
13D/G
13F
3/4/5
Lead comparable stake: 12%
11 rows are not safely comparable across share classes.
13D/G row: BlackRock, Inc.
Showing 1-8 of 13 holder rows.
Quick read
BlackRock, Inc. leads the comparable SEC ownership view at 12%.
2 of 13 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens BlackRock, Inc.'s linked filing trail.
Comparable ownership
Top 2
BlackRock, Inc.
12%
HUNTINGTON NATIONAL BANK
0%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 13 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. |
13D/G
|
12%
|
$862,066,790
7,478,856 shares
|
$0 | 31 Dec 2024 |
| HUNTINGTON NATIONAL BANK |
13F
Company
|
0%
|
$2,075
1 shares
|
— | 31 Mar 2026 |
| Uwe Schramm |
3/4/5
Chief Vision Officer
|
—
mixed-class rows
|
$3,909,538
48,645 shares
mixed-class rows
|
— | 08 Jun 2022 |
| Ravi Kunju |
3/4/5
Chief Product Strategy Officer
|
—
class O/S missing
|
$3,827,384
34,388 shares
|
— | 26 Mar 2025 |
| David L. Simon |
3/4/5
Chief Administrative Officer
|
—
class O/S missing
|
$2,359,805
26,745 shares
|
— | 14 Jul 2022 |
| Brett R. Chouinard |
3/4/5
Chief Product and Strategy Officer, Director
|
—
mixed-class rows
|
$1,418,618
24,578 shares
mixed-class rows
|
— | 15 Feb 2022 |
| Richard J. Hart |
3/4/5
Director
|
—
class O/S missing
|
$1,057,655
11,987 shares
|
— | 02 Jun 2021 |
| Kentucky Retirement Systems |
13F
Company
|
—
class O/S missing
|
$862,000
26,513 shares
|
— | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Insider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 24 Jun 2025.
Buys
$0
Insiders: 0
Sells
$0
Insiders: 0
Net
$0
Shares: 0
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 0
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 28 reporting-owner rows connected to Altair Engineering Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
28
Largest Forms 3/4/5 holder
Uwe Schramm
Net 12M change
$0
Latest report
26 Mar 2025
Recent insider transactions for Altair Engineering Inc.
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| No insider transactions were found in the last 12 months for this issuer. | ||||||||||
* marks a reported price that did not pass the local price check.