Form 144 Filer Information UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

Form 144

NOTICE OF PROPOSED SALE OF SECURITIES
PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933

Form 144

144: Issuer Information

Name of Issuer
Altair Engineering Inc.
SEC File Number
001-38263
Address of Issuer
1820 E. BIG BEAVER ROAD
TROY
MICHIGAN
48083
Phone
248-614-2400
Name of Person for Whose Account the Securities are To Be Sold
Marraccini Jeffrey
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer
  1. Officer

144: Securities Information


Record Title of the Class of Securities To Be Sold Name and Address of the Broker Number of Shares or Other Units To Be Sold Aggregate Market Value Number of Shares or Other Units Outstanding Approximate Date of Sale Name the Securities Exchange
#1 COMMON
ETRADE FINANCIAL CORPORATION
3 EDISON DRIVE
ALPHARETTA
GEORGIA
30005
 3,151 $236,146.85 53,400,000 06/07/2023
NASDAQ

144: Securities To Be Sold

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

Record Title of the Class Date you Acquired Nature of Acquisition Transaction Name of Person from Whom Acquired Is this a Gift? Date Donor Acquired Amount of Securities Acquired Date of Payment Nature of Payment *
#1 COMMON 06/07/2023 STOCK OPTION EXERCISE ISSUER ☐ — 3,151 06/07/2023 COMPENSATION


* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

144: Securities Sold During The Past 3 Months

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

Record Name and Address of Seller Title of Securities Sold Date of Sale Amount of Securities Sold Gross Proceeds
#1 JEFFREY D MARRACCINI
1820 E. BIG BEAVER ROAD
TROY
MICHIGAN
48083		 RESTRICTED STOCK 05/12/2023 41 $2,763.40
#2 JEFFREY D MARRACCINI
1820 E. BIG BEAVER ROAD
TROY
MICHIGAN
48083		 RESTRICTED STOCK 03/16/2023 220 $14,292.81
#3 JEFFREY D MARRACCINI
1820 E. BIG BEAVER ROAD
TROY
MICHIGAN
48083		 RESTRICTED STOCK 03/13/2023 125 $7,811.27

144: Remarks and Signature

Remarks
Date of Notice
06/07/2023

ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature
/s/ Jeffrey David Marraccini

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)
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