Statement of Changes in Beneficial Ownership (4)

FORM 4

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP OF SECURITIES

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Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934 or Section 30(h) of the Investment Company Act of 1940

1. Name and Address of Reporting Person * Scapa James Ralph	2. Issuer Name and Ticker or Trading Symbol Altair Engineering Inc. [ ALTR ]	5. Relationship of Reporting Person(s) to Issuer (Check all applicable) __X__ Director                    __X__ 10% Owner __X__ Officer (give title below)    _____ Other (specify below) Chief Executive Officer
(Last)          (First)          (Middle) C/O ALTAIR ENGINEERING INC., 1820 E. BIG BEAVER ROAD	3. Date of Earliest Transaction (MM/DD/YYYY) 10/15/2020
(Street) TROY, MI 48083 (City)        (State)        (Zip)	4. If Amendment, Date Original Filed (MM/DD/YYYY)	6. Individual or Joint/Group Filing (Check Applicable Line) _X _ Form filed by One Reporting Person ___ Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1.Title of Security (Instr. 3)	2. Trans. Date	2A. Deemed Execution Date, if any	3. Trans. Code (Instr. 8)		4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	10/15/2020		C		19288	A	$0.00	19288	I	By James R. Scapa Declaration of Trust dated March 5, 1987 (1)
Class A Common Stock	10/15/2020		S(2)		18414 (2)	D	$45.748 (3)	874	I	By James R. Scapa Declaration of Trust dated March 5, 1987 (1)
Class A Common Stock	10/15/2020		S(2)		874 (2)	D	$46.179 (4)	0	I	By James R. Scapa Declaration of Trust dated March 5, 1987 (1)
Class A Common Stock	10/15/2020		C		9564	A	$0.00	9564	I	By JRS Investments LLC (5)
Class A Common Stock	10/15/2020		S(2)		9564 (2)	D	$45.765 (6)	0	I	By JRS Investments LLC (5)
Class A Common Stock	10/16/2020		C		11586	A	$0.00	11586	I	By James R. Scapa Declaration of Trust dated March 5, 1987 (1)
Class A Common Stock	10/16/2020		S(2)		11586 (2)	D	$46.281 (7)	0	I	By James R. Scapa Declaration of Trust dated March 5, 1987 (1)
Class A Common Stock	10/16/2020		C		6052	A	$0.00	6052	I	By JRS Investments LLC (5)
Class A Common Stock	10/16/2020		S(2)		6052 (2)	D	$46.29 (8)	0	I	By JRS Investments LLC (5)
Class A Common Stock								47636 (9)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivate Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Trans. Date	3A. Deemed Execution Date, if any	4. Trans. Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Class B Common Stock	$0.00	10/15/2020		C			19288	(10)	(10)	Class A Common Stock	19288	$0.00	10976708	I	By James R. Scapa Declaration of Trust dated March 5, 1987 (1)
Class B Common Stock	$0.00	10/15/2020		C			9564	(10)	(10)	Class A Common Stock	9564	$0.00	7184440	I	By JRS Investments LLC (5)
Class B Common Stock	$0.00	10/16/2020		C			11586	(10)	(10)	Class A Common Stock	11586	$0.00	10965122	I	By James R. Scapa Declaration of Trust dated March 5, 1987 (1)
Class B Common Stock	$0.00	10/16/2020		C			6052	(10)	(10)	Class A Common Stock	6052	$0.00	7178388	I	By JRS Investments LLC (5)

Explanation of Responses:
(1)	Reporting person serves as Trustee. Reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or for any other purpose.
(2)	The sale of the shares of Class A Common Stock were made pursuant to a plan intended to comply with Rule 10b5-1 of the Exchange Act, previously entered into on June 15, 2020.
(3)	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.13 to $46.12 per share, inclusive. The reporting person undertakes to provide to Altair Engineering Inc., any security holder of Altair Engineering Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein.
(4)	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $46.14 to $46.30 per share, inclusive. The reporting person undertakes to provide to Altair Engineering Inc., any security holder of Altair Engineering Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein.
(5)	Reporting person serves as Manager. Reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein, and the inclusion of these shares in this report shall not be deemed an admission of beneficial ownership of all of the reported shares for purposes of Section 16 or for any other purpose.
(6)	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.21 to $46.16 per share, inclusive. The reporting person undertakes to provide to Altair Engineering Inc., any security holder of Altair Engineering Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein.
(7)	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.83 to $46.51 per share, inclusive. The reporting person undertakes to provide to Altair Engineering Inc., any security holder of Altair Engineering Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein.
(8)	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $45.83 to $46.48 per share, inclusive. The reporting person undertakes to provide to Altair Engineering Inc., any security holder of Altair Engineering Inc., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth herein.
(9)	Includes 41,000 Class A Common Stock restricted stock units that are unvested.
(10)	Each share of Class B common stock is immediately convertible, at the option of the shareholder, into one share of Class A common stock and shall automatically convert into Class A common stock upon the occurrence of certain events. Please see Altair Engineering Inc. Registration Statement filed with the Securities and Exchange Commission on Form S-1 (File No. 333-225412) for a description of the conversion rights.

Reporting Owners
Reporting Owner Name / Address	Relationships
	Director	10% Owner	Officer	Other
Scapa James Ralph C/O ALTAIR ENGINEERING INC. 1820 E. BIG BEAVER ROAD TROY, MI 48083	X	X	Chief Executive Officer

Signatures
/s/ Raoul Maitra, attorney-in-fact for James R. Scapa		10/19/2020
**Signature of Reporting Person		Date