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Filing Details

Accession Number:: 0000950170-25-045435
Form Type:: 13G Filing
Publication Date:: 2025-03-25 20:00:00

Filed By:: George J. Christ
Company:: Altair Engineering Inc. (NASDAQ:ALTR)
Filing Date:: 2025-03-26
SEC Url:: 13G Filing

Ownership Summary

Please notice the below summary table is generated without human intervention and may contain errors. Please refer to the complete filing displayed below for exact figures.

Name	Beneficially Owned Number of Shares	Beneficially Owned Number of Aggregate Shares	Percent of Class
George J. Christ	0	0	0%
Christ Revocable Trust dated May 8, 2015	0	0	0%
GC Investments, LLC	0	0	0%

Filing

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 8)

Altair Engineering Inc.

(Name of Issuer)

Class A Common Stock $0.0001 par value per share

(Title of Class of Securities)

021369103

(CUSIP Number)

03/26/2025

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No.

021369103

Names of Reporting Persons

George J. Christ

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

0 %

Type of Reporting Person (See Instructions)

Comment for Type of Reporting Person: See Item 2 for additional information.

SCHEDULE 13G

CUSIP No.

021369103

Names of Reporting Persons

Christ Revocable Trust dated May 8, 2015

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

0 %

Type of Reporting Person (See Instructions)

Comment for Type of Reporting Person: See Item 2 for additional information.

SCHEDULE 13G

CUSIP No.

021369103

Names of Reporting Persons

GC Investments, LLC

Check the appropriate box if a member of a Group (see instructions)

(a)

(b)

Sec Use Only

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 0.00

Aggregate Amount Beneficially Owned by Each Reporting Person

0.00

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

Checkbox not checked

Percent of class represented by amount in row (9)

0 %

Type of Reporting Person (See Instructions)

Comment for Type of Reporting Person: See Item 2 for additional information.

SCHEDULE 13G

Item 1.

(a)

Name of issuer:

Altair Engineering Inc.

(b)

Address of issuer's principal executive offices:

1820 E. Big Beaver Road, Troy, MI 48083

Item 2.

(a)

Name of person filing:

This report on Schedule 13G is being jointly filed by (i) Christ Revocable Trust dated May 8, 2015 (the "Christ Trust"), (ii) GC Investments, LLC (the "GC LLC"), and (iii) George J. Christ as the Trustee of the Christ Trust, the Manager of the GC LLC, the Co-Trustee of The Dana Christ Irrevocable Trust Dated May 8, 2015 and the Co-Trustee of The Lauren Christ Irrevocable Trust Dated May 8, 2015 ("Mr. Christ" and, collectively with the Christ Trust and the GC LLC, the "Reporting Persons").

(b)

Address or principal business office or, if none, residence:

The address for the Reporting Persons is: c/o Altair Engineering Inc. 1820 E. Big Beaver Road Troy, MI 48083

(c)

Citizenship:

Mr. Christ is a citizen of the United States. The Christ Trust is governed by the laws of Arizona. The GC LLC is organized under the laws of Michigan.

(d)

Title of class of securities:

Class A Common Stock $0.0001 par value per share

(e)

CUSIP No.:

021369103

Item 3.

If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

(a)

Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);

(b)

Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);

(c)

Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);

(d)

Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);

(e)

An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);

(f)

An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);

(g)

A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);

(h)

A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i)

A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);

(j)

A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:

(k)

Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).

Item 4.

Ownership

(a)

Amount beneficially owned:

George J. Christ - 0.00 Christ Revocable Trust dated May 8, 2015 - 0.00 GC Investments, LLC - 0.00

(b)

Percent of class:

George J. Christ - 0.0 % Christ Revocable Trust dated May 8, 2015 - 0.0 % GC Investments, LLC - 0.0

(c)

Number of shares as to which the person has:

(i) Sole power to vote or to direct the vote:

George J. Christ - 0.00 Christ Revocable Trust dated May 8, 2015 - 0.00 GC Investments, LLC - 0.00

(ii) Shared power to vote or to direct the vote:

George J. Christ - 0.00 Christ Revocable Trust dated May 8, 2015 - 0.00 GC Investments, LLC - 0.00

(iii) Sole power to dispose or to direct the disposition of:

George J. Christ - 0.00 Christ Revocable Trust dated May 8, 2015 - 0.00 GC Investments, LLC - 0.00

(iv) Shared power to dispose or to direct the disposition of:

George J. Christ - 0.00 Christ Revocable Trust dated May 8, 2015 - 0.00 GC Investments, LLC - 0.00

Item 5.

Ownership of 5 Percent or Less of a Class.

Ownership of 5 percent or less of a class

Item 6.

Ownership of more than 5 Percent on Behalf of Another Person.

Not Applicable

Item 7.

Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.

Not Applicable

Item 8.

Identification and Classification of Members of the Group.

Not Applicable

Item 9.

Notice of Dissolution of Group.

Not Applicable

Item 10.

Certifications:

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

George J. Christ

Signature:	/s/ Raoul Maitra
Name/Title:	Raoul Maitra, Attorney-in-fact for George J. Christ **
Date:	03/26/2025

Christ Revocable Trust dated May 8, 2015

Signature:	/s/ Raoul Maitra
Name/Title:	Raoul Maitra, Attorney-in-fact for Christ Revocable Trust dated May 8, 2015 **
Date:	03/26/2025

GC Investments, LLC

Signature:	/s/ Raoul Maitra
Name/Title:	Raoul Maitra, Attorney-in-fact for GC Investments, LLC **
Date:	03/26/2025

Comments accompanying signature: ** A power of attorney was previously filed with the Commission and is incorporated herein by reference to Exhibits 99.2, 99.3 and 99.4 to the Schedule 13G filed by George J. Christ on February 14, 2018. The original statement shall be signed by each person on whose behalf the statement is filed or such person's authorized representative. If the statement is signed on behalf of a person by such person's authorized representative (other than an executive officer or general partner of the filing person), evidence of the representative's authority to sign on behalf of such person shall be filed with the statement; provided, however, that a power of attorney for this purpose which is already on file with the Commission may be incorporated by reference. The name and any title of each person who signs the statement shall be typed or printed beneath such person's signature.

Exhibit Information

Exhibit 99.1 - A Joint Filing Agreement was previously filed with the Commission and is incorporated herein by reference to Exhibit 99.1 to the Schedule 13G/A filed by George J. Christ on February 14, 2019.