UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or Section 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): March 25, 2021

ARCLIGHT CLEAN TRANSITION CORP. II

(Exact name of registrant as specified in its charter)

(617) 531-6300

Registrant’s telephone number, including area code

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation to the registrant under any of the following provisions:

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934.

Emerging growth company  ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☐

Item 8.01. Other Events.

On March 25, 2021, ArcLight Clean Transition Corp. II (the “Company”) consummated an initial public offering (the “IPO”) of 31,116,305 units (the “Units”) at an offering price of $10.00 per Unit, which includes an additional sale of 3,616,305 units, pursuant to the partial exercise of the underwriters’ option to purchase an additional 4,125,000 Units at the initial public offering price to cover over-allotments, and a private placement with ArcLight CTC Holdings II, L.P. of 9,223,261 private placement warrants at a price of $1.00 per warrant (the “Private Placement”). The net proceeds from the IPO together with certain of the proceeds from the Private Placement, $311,163,050 in the aggregate (the “Offering Proceeds”), were placed in a trust account established for the benefit of the Company’s public shareholders and the underwriters of the IPO with Continental Stock Transfer & Trust Company acting as trustee. Except with respect to interest earned on the Offering Proceeds held in the trust account that may be released to the Company to pay its income taxes, if any, the Company’s amended and restated memorandum and articles of association will provide that the Offering Proceeds will not be released from the trust account (1) to the Company, until the completion of its initial business combination, or (2) to its public shareholders, until the earliest of (a) the completion of the its initial business combination, and then only in connection with those Class A ordinary shares that such shareholders properly elected to redeem, (b) the redemption of any public shares properly tendered in connection with a shareholder vote to amend the Company’s amended and restated memorandum and articles of association (A) to modify the substance or timing of the Company’s obligation to provide holders of its Class A ordinary shares the right to have their shares redeemed in connection with the Company’s initial business combination or to redeem 100% of its public shares if the Company does not complete its initial business combination within 24 months from the closing of the IPO, or 30 months from the closing of the IPO if the Company has executed a letter of intent, agreement in principle or definitive agreement for an initial business combination within 24 months from the closing of the IPO, or (B) with respect to any other provision relating to the rights of holders of its Class A ordinary shares, and (c) the redemption of the public shares if the Company has not consummated its business combination within 24 months from the closing of the IPO, or 30 months from the closing of the IPO if the Company has executed a letter of intent, agreement in principle or definitive agreement for an initial business combination within 24 months from the closing of the IPO, subject to applicable law.

An audited balance sheet as of March 25, 2021 reflecting receipt of the Offering Proceeds has been issued by the Company and is included as Exhibit 99.1 to this Current Report on Form 8-K.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

Dated: March 31, 2021