UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 13G

(Amendment No. )*

Under the Securities Exchange Act of 1934

AltC Acquisition Corp.

(Name of Issuer)

Class A Common Stock, par value $0.0001 per share

(Titles of Class of Securities)

02156V109

(CUSIP Number)

December 31, 2021

(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)

x Rule 13d-1(d)

* The remainder of this cover page shall be filled out of a reporting person’s initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be “filed” for the purpose of Section 18 of the Securities Exchange Act of 1934, as amended (the “Act”) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

CUSIP No. 02156V109 SCHEDULE 13G Page 2 of 9

1	NAME OF REPORTING PERSON AltC Sponsor LLC
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP			(a)   ¨ (b)   ¨
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION Delaware
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER 0
		6	SHARED VOTING POWER 13,950,000
		7	SOLE DISPOSITIVE POWER 0
		8	SHARED DISPOSITIVE POWER 13,950,000
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 13,950,000
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES			¨
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 21.8%
12	TYPE OF REPORTING PERSON OO

CUSIP No. 02156V109 SCHEDULE 13G Page 3 of 9

1	NAME OF REPORTING PERSON M. Klein Associates, Inc.
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP			(a)   ¨ (b)   ¨
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION New York
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER 0
		6	SHARED VOTING POWER 13,950,000
		7	SOLE DISPOSITIVE POWER 0
		8	SHARED DISPOSITIVE POWER 13,950,000
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 13,950,000
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES			¨
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 21.8%
12	TYPE OF REPORTING PERSON CO

CUSIP No. 02156V109 SCHEDULE 13G Page 4 of 9

1	NAME OF REPORTING PERSON Michael Klein
2	CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP			(a)   ¨ (b)   ¨
3	SEC USE ONLY
4	CITIZENSHIP OR PLACE OF ORGANIZATION United States
NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH		5	SOLE VOTING POWER 0
		6	SHARED VOTING POWER 13,950,000
		7	SOLE DISPOSITIVE POWER 0
		8	SHARED DISPOSITIVE POWER 13,950,000
9	AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 13,950,000
10	CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES			¨
11	PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 21.8%
12	TYPE OF REPORTING PERSON IN

CUSIP No. 02156V109 SCHEDULE 13G Page 5 of 9

Item 1(a).	Name of Issuer:
	AltC Acquisition Corp.
Item 1(b).	Address of Issuer’s Principal Executive Offices:
	640 Fifth Avenue, 12th Floor
	New York, NY 10019
Item 2(a).	Name of Person Filing:
	This statement is filed on behalf of each of the following persons (collectively, the “Reporting Persons”):
	1. AltC Sponsor LLC
	2. M. Klein Associates, Inc.
	3. Michael Klein
Item 2(b).	Address of Principal Business Office or, if none, Residence:
	The principal business address of each of the Reporting Persons is as follows:
	640 Fifth Avenue, 12th Floor
	New York, NY 10019
Item 2(c).	Citizenship:
	See responses to Item 4 on each cover page.
Item 2(d).	Titles of Classes of Securities:
	Class A Common Stock, par value $0.0001 per share.
Item 2(e).	CUSIP Number:
	02156V109

Item 3. If This Statement is Filed Pursuant to Rule 13d-1(b), or 13d-2(b) or (c), Check Whether the Person Filing is a(n):

(a)	¨	Broker or dealer registered under Section 15 of the Exchange Act (15 U.S.C. 78o).
(b)	¨	Bank as defined in Section 3(a)(6) of the Exchange Act (15 U.S.C. 78c).
(c)	¨	Insurance company as defined in Section 3(a)(19) of the Exchange 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)	¨	Investment adviser in accordance with §240.13d-1(b)(1)(ii)(E).
(f)	¨	Employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F).
(g)	¨	Parent holding company or control person in accordance with §240.13d-1(b)(1)(ii)(G).

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(h)	¨	Savings association as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813).
(i)	¨	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)	¨	Non-U.S. institution, in accordance with § 240.13d-1(b)(1)(ii)(J).
(k)	¨	Group in accordance with §240.13d-1(b)(1)(ii)(K).

If filing as a non-U.S. institution in accordance with §240. 13d-1(b)(1)(ii)(J), please specify the type of institution:

Item 4.	Ownership
	AltC Sponsor LLC (“AltC Sponsor”) directly owns 12,500,000 shares of Class B Common Stock, par value $0.0001 per share (“Class B Common Stock”), of the Issuer, which are convertible into the Issuer’s Class A Common Stock, par value $0.0001 per share (“Class A Common Stock”). AltC Sponsor directly owns 1,450,000 shares of Class A Common Stock. Such shares of Class A Common Stock and Class B Common Stock may be deemed to be indirectly owned by M. Klein Associates, Inc. (“M. Klein Associates”), which is the managing member of AltC Sponsor, and Michael Klein, who is the sole stockholder of M. Klein Associates. As a result of these relationships, each of AltC Sponsor, M. Klein Associates and Mr. Klein may be deemed to have or share beneficial ownership of the securities held directly by AltC Sponsor. Each of AltC Sponsor, M. Klein Associates and Mr. Klein disclaim beneficial ownership of such securities except to the extent of their direct ownership.
	Percentage ownership is based on 51,450,000 shares of Class A Common Stock and 12,500,000 shares of Class B Common Stock outstanding as of November 15, 2021, as reported by the Issuer in its Quarterly Report on Form 10-Q filed on November 15, 2021, and assumes conversion of all Class B Common Stock into Class A Common Stock.

(a)	Amount beneficially owned:
	See responses to Item 9 on each cover page.
(b)	Percent of class:
	See responses to Item 11 on each cover page.
(c)	Number of shares as to which such person has:

(i)	Sole power to vote or to direct the vote:
	See responses to Item 5 on each cover page.
(ii)	Shared power to vote or to direct the vote:
	See responses to Item 6 on each cover page.
(iii)	Sole power to dispose or to direct the disposition of:
	See responses to Item 7 on each cover page.

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(iv)	Shared power to dispose or to direct the disposition of:
	See responses to Item 8 on each cover page.

Item 5.	Ownership of Five Percent or Less of a Class.
	If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following ☐.
Item 6.	Ownership of More than Five 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.
	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.	Certification.
	Not Applicable.

CUSIP No. 02156V109 SCHEDULE 13G Page 8 of 9

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.

Dated: February 11, 2022

AltC Sponsor LLC
By:	M. Klein Associates, Inc., its manager
By:	/s/ Jay Taragin
Name:	Jay Taragin
Title:	Chief Financial Officer
M. Klein Associates, Inc.
By:	/s/ Jay Taragin
Name:	Jay Taragin
Title:	Chief Financial Officer
Michael Klein
By:	/s/ Michael Klein
Name:	Michael Klein

CUSIP No. 02156V109 SCHEDULE 13G Page 9 of 9

Exhibit Index

Exhibit No.	Description
Exhibit 1	Joint Filing Agreement, dated as of February 11, 2022, by and among AltC Sponsor LLC, M. Klein Associates, Inc. and Michael Klein