Filing Details

---

CUSIP No. 03940F103

Page 2 of 24

CUSIP No. 03940F103

Page 3 of 24

.

CUSIP No. 03940F103

Page 4 of 24

CUSIP No. 03940F103

Page 5 of 24

CUSIP No. 03940F103

Page 6 of 24

CUSIP No. 03940F103

Page 7 of 24

CUSIP No. 03940F103

Page 8 of 24

**Less than 1%.

CUSIP No. 03940F103

Page 9 of 24

**Less than 1%.

CUSIP No. 03940F103

Page 10 of 24

**Less than 1%.

CUSIP No. 03940F103

Page 11 of 24

**Less than 1%.

CUSIP No. 03940F103

Page 12 of 24

**Less than 1%.

CUSIP No. 03940F103

Page 13 of 24

**Less than 1%.

CUSIP No. 03940F103

Page 14 of 24

**Less than 1%.

CUSIP No. 03940F103

Page 15 of 24

This Amendment No. 6 (this “Amendment No. 6”) to the statement on Schedule 13D amends and supplements the statement on Schedule 13D filed by the Reporting Persons on September 27, 2021 (the “Original Schedule 13D”), as amended by Amendment No. 1 to the Original Schedule 13D filed by the Reporting Persons on November 8, 2021, Amendment No. 2 to the Original Schedule 13D filed by the Reporting Persons on November 24, 2021, Amendment No. 3 to the Original Schedule 13D filed by the Reporting Persons on December 13, 2021, Amendment No. 4 to the Original Schedule 13D filed by the Reporting Persons on December 15, 2021 and Amendment No. 5 to the Original Schedule 13D filed by the Reporting Persons on January 3, 2022 (“Amendment No. 5” and collectively with all previous amendments, the “13D Filing” and, together with this Amendment No. 6, the “Schedule 13D”). Except as amended in this Amendment No. 6, the 13D Filing remains in full force and effect. Terms defined in the 13D Filing are used in this Amendment No. 6 as so defined, unless otherwise defined in this Amendment No. 6.

Item 1.

Item 1 of the 13D Filing is hereby amended by deleting the second, third and fourth paragraphs thereunder.

Item 4.  Purpose of Transaction.

Item 4 of the Schedule 13D Filing is hereby amended to include the following information:

On March 22, 2022, Archaea Energy Inc. (the “Issuer”), Aria RES, as the selling stockholder (the “Selling Stockholder”), and Barclays Capital Inc. and Jefferies LLC, as representatives of the underwriters listed on Schedule I to the Underwriting Agreement (as defined below) (the “Underwriters”), entered into an underwriting agreement (the “Underwriting Agreement”) with respect to, among other things, the sale by Aria RES of up to 14,962,643 shares of Class A Common Stock, par value $0.0001 per share, of the Issuer pursuant to the Underwriting Agreement (the “Underwritten Offering”). Pursuant to the Underwriting Agreement, the Selling Stockholder agreed to sell 12,933,603 shares of Class A Common Stock to the Underwriters at a price of $17.04 per share (net of underwriting discounts and commissions). In addition, pursuant to the Underwriting Agreement, the Selling Stockholder granted the Underwriters an option to purchase up to an additional 1,949,040 shares of Class A Common Stock within 30 days following the date of the prospectus supplement relating to the Underwritten Offering at a price of $17.04 per share (net of underwriting discounts and commissions), which option was exercised by the Underwriters in full. The foregoing description of the Underwriting Agreement is qualified in its entirety by reference to the full text of the Underwriting Agreement, a copy of which is filed as Exhibit 15 hereto, and is incorporated by reference into this Item 4.

CUSIP No. 03940F103

Page 16 of 24

The sale of the Class A Common Stock pursuant to the Underwriting Agreement closed on March 25, 2022. Upon completion of the Underwritten Offering, the Ares Investor (as defined in the Stockholders’ Agreement), which includes the Reporting Persons, no longer held at least 50% of the Registrable Securities (as defined in the Stockholders’ Agreement) held by it on the Closing Date (as defined in the Stockholders’ Agreement). As a result, the Ares Investor no longer has board designation rights pursuant to the Stockholders’ Agreement and the term of the director designated by the Ares Investor to serve on the Board automatically ended. In addition, all unvested RSUs held by the director were automatically terminated and forfeited.

In connection with the Underwriting Agreement, on March 22, 2022, each of the Selling Stockholder, certain other stockholders and the directors and executive officers of the Issuer (collectively, the “Lock-Up Parties”) entered into a lock-up agreement with the Underwriters (the “Lock-Up Agreement”). Pursuant to the terms of the Lock-Up Agreement, the Selling Stockholder has agreed, with certain limited exceptions, not to (1) offer for sale, sell, pledge, or otherwise dispose of (or enter into any transaction or device that is designed to, or would be expected to, result in the disposition by any person at any time in the future of) any shares of Class A Common Stock (including, without limitation, shares of Class A Common Stock that may be deemed to be beneficially owned by the Selling Stockholder in accordance with the rules and regulations of the Securities and Exchange Commission (the “SEC”) and shares of Class A Common Stock that may be issued upon exercise of any options or warrants) or securities convertible into or exercisable or exchangeable for Class A Common Stock, except sales of the Class A Common Stock pursuant to the Underwriting Agreement, (2) enter into any swap or other derivatives transaction that transfers to another, in whole or in part, any of the economic benefits or risks of ownership of shares of Class A Common Stock, whether any such transaction described in clause (1) or (2) above is to be settled by delivery of Class A Common Stock or other securities, in cash or otherwise, (3) make any demand for the filing of or exercise any right or cause to be confidentially submitted or filed, a registration statement, including any amendments thereto, with respect to the registration of any shares of Class A Common Stock or securities convertible into or exercisable or exchangeable for Class A Common Stock or any other securities of the Issuer, except for any registration on Form S-8, or any demands or requests for, exercises of any right with respect to, or taking of any action in preparation of, the registration by the Issuer under the Securities Act of 1933, as amended (the “Securities Act”), of a Lock-Up Party’s shares of Class A Common Stock, provided that no transfer of the Lock-Up Party’s shares of Class A Common Stock registered pursuant to the exercise of any such right and no registration statement shall be filed under the Securities Act with respect to any of the Lock-Up Party’s shares of Class A Common Stock during the Lock-Up Period (as defined below), or (4) publicly disclose the intention to do any of the foregoing for a period commencing on the date of the prospectus relating to the Underwritten Offering and ending on the 45th day after such date (the “Lock-Up Period”). The foregoing description of the Lock-Up Agreement is qualified in its entirety by reference to the full text of the Form of the Lock-Up Agreement, a copy of which is filed as Exhibit 16 hereto, and is incorporated by reference into this Item 4.

Item 5 of the 13D Filing is hereby amended and restated in its entirety as follows:

The information set forth or incorporated by reference in Items 2 and 6 of the Schedule 13D is incorporated by reference in this Item 5.

The aggregate percentage of shares of Class A Common Stock that the Reporting Persons may be deemed to beneficially own is determined in accordance with the rules of the SEC and is based on 80,189,841 shares of Class A Common Stock outstanding as of the date of this filing, which consists of 65,247,198 shares of Class A Common Stock outstanding as of March 4, 2022, as reported in the Issuer’s Annual Report on Form 10-K filed with the SEC on March 18, 2022, and 14,942,643 shares of Class A Common Stock issued in exchange for the same number of LFG Class A Units beneficially owned by the Reporting Persons in the aggregate in connection with the Underwritten Offering.

CUSIP No. 03940F103

Page 17 of 24

(a) and (b)

As of the date of this filing, each of Ares Management LLC, Ares Management Holdings, Ares Holdco, Ares Management, Ares Voting, Ares Management GP and Ares Partners (collectively, the “Ares Management Entities”) beneficially own 1,877 shares of Class A Common Stock held directly by Ares Management LLC. The percentage of Class A Common Stock beneficially owned by each of the Ares Management Entities is less than 1% of the outstanding shares of Class A Common Stock as of the date of this filing. Each of the Ares Entities, as a result of the relationships described in Item 2, may be deemed to directly or indirectly beneficially own the shares of Class A Common Stock held by Ares Management LLC.

Other than as described in the immediately preceding paragraph, none of the Reporting Persons beneficially own any other shares of Class A Common Stock as a result of the Underwritten Offering.

(c) Except in connection with the Underwritten Offering, none of the Reporting Persons has effected any transaction related to the Common Stock during the past 60 days.

(d) Except as otherwise described in this Schedule 13D, no other person has the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, securities covered by this Schedule 13D.

(e) As of March 25, 2022, none of the Reporting Persons hold or beneficially own shares of Class A Common Stock representing 5.0% or more of the outstanding shares of Class A Common Stock.

Item 6 of the 13D Filing is hereby amended to add the following:

The information set forth in Item 4 above is hereby incorporated by reference into this Item 6.

Item 7.  Material to be Filed as Exhibits.

The information contained in Item 7 of the 13D Filing is hereby amended and supplemented by adding the following:

CUSIP No. 03940F103

Page 18 of 24

CUSIP No. 03940F103

Page 19 of 24

SIGNATURES

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

Date: March 28, 2022

	Aria Renewable Energy Systems LLC
	/s/ Noah Ehrenpreis
	By:  Noah Ehrenpreis
	Its:  Vice President
	United States Power Fund III, L.P.
	By: EIF US Power III, LLC, its general partner
	By: Ares EIF Management, LLC, its managing member
	/s/ Noah Ehrenpreis
	By:  Noah Ehrenpreis
	Its:  Vice President
	EIF US Power III, LLC
	By: Ares EIF Management, LLC, its managing member
	/s/ Noah Ehrenpreis
	By:  Noah Ehrenpreis
	Its:  Vice President
	EIF United States Power Fund IV, L.P.
	By: EIF US Power IV, LLC, its general partner
	By: Ares EIF Management, LLC, its managing member
	/s/ Noah Ehrenpreis
	By:  Noah Ehrenpreis
	Its:  Vice President

CUSIP No. 03940F103

Page 20 of 24

CUSIP No. 03940F103

Page 21 of 24