Item 8.01. Other Events.




As previously disclosed, on May 6, 2021, ACON S2 Acquisition Corp., a Cayman
Islands exempted company, (the "Company" or "STWO"), entered into an Agreement
and Plan of Merger (as it may be amended, supplemented or otherwise modified
from time to time, the "Merger Agreement") with SCharge Merger Sub, Inc., a
Delaware corporation and a wholly-owned direct subsidiary of STWO ("Merger
Sub"), and ESS Tech, Inc., a Delaware corporation ("ESS"), pursuant to which,
subject to the terms and conditions of the Merger Agreement, STWO will
consummate its initial business combination with ESS (the "Business
Combination"). On September 9, 2021, STWO filed a registration statement (the
"Registration Statement") on Form S-4 (No. 333- 257232) containing a proxy
statement/prospectus of STWO in connection with the Business Combination (such
proxy statement/prospectus in definitive form, the "Proxy
Statement/Prospectus"), which was declared effective by the Securities and
Exchange Commission (the "SEC") on September 14, 2021, and STWO commenced
mailing the Proxy Statement/Prospectus on September 14, 2021.

On July 14, 2021, August 13, 2021, September 15, 2021 and September 16, 2021,
STWO received a total of four demand letters from purported shareholders of STWO
(the "Demand Letters") alleging that the Proxy Statement/Prospectus contained
disclosure deficiencies and/or incomplete information regarding the Business
Combination.

STWO believes that the disclosures set forth in the Proxy Statement/Prospectus
comply fully with applicable law and that the allegations contained in the
Demand Letters are entirely without merit. However, in order to moot the
purported STWO shareholders' unmeritorious disclosure claims, preclude any
efforts to delay the closing of the Business Combination, avoid nuisance and
alleviate the costs, distractions, risks and uncertainties inherent in
litigation, STWO has determined to voluntarily supplement the Proxy
Statement/Prospectus with certain supplemental disclosures (the "Supplemental
Disclosures") as described in the following section entitled "Supplemental
Disclosures to Proxy Statement Prospectus" in this Current Report on
Form 8-K. Nothing in this Current Report on Form 8-K shall be deemed an
admission of the legal necessity or materiality under applicable laws of any of
the disclosures set forth herein. To the contrary, STWO specifically denies all
allegations by the purported STWO shareholders in the Demand Letters that any
additional disclosure was or is required.

The Supplemental Disclosures contained herein will not affect the timing of
STWO's extraordinary general meeting of its shareholders, which is scheduled to
be held virtually on October 5, 2021 at 10:30 AM Eastern Time. You will be able
to virtually attend, vote your shares and submit questions during the
extraordinary general meeting via a live audio webcast by pre-registering at
https://www.cstproxy.com/acon/sm2021.

STWO's board of directors continues to recommend that STWO shareholders vote
"FOR" each proposal being submitted to a vote of the STWO shareholders at the
extraordinary general meeting.

Entry Into Irrevocable Proxy and Power of Attorney Agreement



As previously disclosed, ESS and SB Energy Global Holdings One Ltd. ("SBE")
filed a joint Committee on Foreign Investment in the United States ("CFIUS")
notice in August 2021 seeking CFIUS's approval of SBE's acquisition of certain
voting shares, as well as certain deferred information and governance rights, in
New ESS (the "SBE CFIUS Approval"). ESS and SBE will use their reasonable best
efforts to satisfy CFIUS and provide any documentation or information requested
or required by CFIUS prior to Closing, but the receipt of CFIUS approval is not
a condition to Closing. The receipt and timing of the SBE CFIUS Approval is
uncertain. In anticipation of Closing, ESS, STWO, and SBE entered into an
Irrevocable Proxy and Power of Attorney Agreement, dated as of September 30,
2021 (the "Irrevocable Proxy Agreement"), pursuant to which certain SBE rights
will be subject to receipt of the SBE CFIUS Approval. In particular, SBE will
grant the Secretary of New ESS an irrevocable proxy to vote its shares in New
ESS that represent more than 9.9% of all issued and outstanding shares of New
ESS pro rata in the same manner and proportion as how the other holders of New
ESS common stock vote their shares. Such proxy shall remain in place for all SBE
shares above 9.9% of all issued and outstanding shares until the SBE CFIUS
Approval is obtained, at which time it shall continue in place but with a
revised threshold, applying to all SBE shares above 19.9% of all issued and
outstanding shares. We cannot assure you that we will receive the SBE CFIUS
Approval, and cannot predict what (if any) mitigation measures CFIUS may
request, require or impose before granting the SBE CFIUS Approval or the impact
of such mitigation measures on New ESS' business, including our

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relationship with SBE. Failure to receive the SBE CFIUS Approval could have a
materially adverse effect on our business, prospects, and financial condition.
In addition, if we do become subject to CFIUS mitigation measures, actual or
alleged violations could damage New ESS' reputation and ability to do business.

The following is a summary of certain material terms and provisions of the
Irrevocable Proxy Agreement. This summary does not purport to describe all of
the terms and provisions of the Irrevocable Proxy Agreement and is qualified in
its entirety by the complete text of the Irrevocable Proxy Agreement, which is
filed as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated by
reference herein.

Supplemental Disclosures to Proxy Statement/Prospectus



The following supplemental information should be read in conjunction with the
Proxy Statement/Prospectus, which should be read in its entirety. All page
references are to pages in the Proxy Statement/Prospectus, and terms used below,
unless otherwise defined, have the meanings set forth in the Proxy
Statement/Prospectus.

The following disclosure replaces the third sentence of the last paragraph on page 102 of the Proxy Statement/Prospectus:



STWO entered into non-disclosure agreements with over 50 of these potential
business combination targets, each of which STWO believes contained customary
confidentiality terms for a special purpose acquisition company and a private
company target, including ESS, for purposes of performing due diligence and
further evaluating and analyzing these companies as potential business
combination targets.

The following disclosure is added after the second paragraph on page 105 of the Proxy Statement/Prospectus:

On January 9, 2021, ESS provided STWO with ESS' unaudited financial results for the fiscal year ended December 31, 2020.



The following disclosure is added before the first paragraph on page 112 of the
Proxy Statement/Prospectus before the heading "Certain ESS Projected Financial
Information".

Comparable Public Companies

STWO's management worked with its financial advisors to develop a comparable
companies data set and ran a comparable companies analysis to assess the value
that the public markets would likely ascribe to STWO following a business
combination with ESS. The relative valuation analysis was based on selected
publicly traded companies in the battery storage, fuel cell and electrolyzers,
and renewable technologies sectors (each further described below and together,
the "Publicly Traded Benchmark Companies"). The selected companies were chosen
because they were determined by STWO's management to be relevant comparisons to
ESS (but, for the avoidance of doubt, each of the selected companies is not
necessarily a direct competitor of ESS). Some of the factors considered by
STWO's management in selecting these companies as examples of comparable
publicly traded companies include the similarity of their end markets, business
models, go-to-market strategies, ESG characteristics, and forecasted margins and
growth rates relative to ESS. While these companies may share certain
characteristics that are similar to those of ESS, STWO recognized that no
company was identical in nature to ESS.

Using publicly available information, STWO's management reviewed, among other
things, the estimated revenues, revenue growth rate, estimated gross profit
margin, estimated EBITDA, and estimated EBITDA margin with respect to each such
selected comparable company over a range of years. The data reviewed by STWO for
the Publicly Traded Benchmark Companies is summarized as follows:

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Based on the review of these selected comparable publicly traded companies, the
STWO Board concluded that ESS' estimated revenues, revenue growth rate, gross
profit margin, EBITDA and EBITDA margin were attractive relative to the selected
comparable companies, as well as the median of the Publicly Traded Benchmark
Companies. The results of this analysis supported the STWO Board's
determination, based on a number of factors, that the terms of the merger were
fair to and in the best interests of STWO and its shareholders. The STWO Board
did not rely extensively on the results of this analysis because it saw ESS as a
category catalyst in long duration energy storage solutions.

The following disclosure amends the third sentence of the third paragraph on page 112 of the Proxy Statement/Prospectus:

Management of ESS provided STWO with internally prepared projections for estimated total revenue, gross profit, EBITDA, debt and capital expenditures of ESS for 2021 through 2027 on March 3, 2021.

The following disclosure is added after the last paragraph on page 117 of the Proxy Statement/Prospectus:

Interests of ESS' and STWO's Financial Advisors in the Business Combination



In connection with the consummation of the Business Combination, (i) Deutsche
Bank is entitled to (a) expense reimbursement and customary indemnification in
connection with its services as a M&A advisor to STWO and as placement agent for
the PIPE Financing and (b) customary placement agent fees from STWO in
connection with its services as placement agent for the PIPE Financing, and
(ii) Nomura is entitled to (a) expense reimbursement and customary
indemnification in connection with its services as a financial and capital
markets advisor to ESS and (b) customary financial advisory fees and a
discretionary bonus. Additionally, in connection with the consummation of the
Business Combination, Deutsche Bank will be entitled to deferred underwriting
compensation, as set forth in the registration statement for STWO's initial
public offering, which closed on September 18, 2020. These fees will be paid at
the closing of the Business Combination and are conditioned upon the successful
completion of the Business Combination. If the Business Combination does not
close, Deutsche Bank and Nomura will be entitled to expense reimbursement and
customary indemnification, but will not be entitled to such fees.

In addition, Deutsche Bank (together with its affiliates) and Nomura (together
with its affiliates) are each full service financial institutions engaged in
various activities, which may include sales and trading, commercial and
investment banking, advisory, investment management, investment research,
principal investing, hedging, market making, brokerage and other financial and
non-financial activities and services. Deutsche Bank has not provided any
investment banking or other commercial dealings unrelated to the Business
Combination (or STWO's Initial Public Offering) to STWO, ESS or their respective
affiliates.

In addition, in the ordinary course of its business activities, Deutsche Bank,
Nomura and their respective affiliates, officers, directors and employees may
make or hold a broad array of investments and actively trade debt and equity
securities (or related derivative securities) and financial instruments
(including bank loans) for their own account and for the accounts of their
customers. Such investments and securities activities may involve securities
and/or instruments of STWO or its affiliates or ESS or its affiliates. Deutsche
Bank and Nomura and their respective affiliates may also make investment
recommendations and/or publish or express independent research views in respect
of such securities or financial instruments and may hold, or recommend to
clients that they acquire, long and/or short positions in such securities and
instruments.

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The table of the Proxy Statement/Prospectus entitled "Security Ownership of
Certain Beneficial Owners and Management" is amended and supplemented for the
following stockholders to account for shares purchased in the PIPE Financing:



                                                                                                                     After the Business Combination
                                                  Before the Business Combination                   Assuming No Redemption                  Assuming Maximum Redemption
                                             Number            Number                         Number of                                  Number of
                                             of STWO           of STWO           % of         Shares of                    % of          Shares of                    % of
                                             Class A           Class B           Total         New ESS                     Total          New ESS                     Total
                                            Ordinary          Ordinary          Voting          Common         % of       Voting          Common          % of       Voting
Five percent holders                         Shares            Shares            Power          Stock         Class        Power           Stock         Class        Power
BASF Venture Capital GmbH (1)                      -                 -      

- % 7,721,878 5.1 % 5.1 % 7,721,878

     6.1 %        6.1 %
Breakthrough Energy Ventures, LLC (2)              -                 -               -  %      15,527,317       10.2 %       10.2 %       15,527,317       12.2 %       12.2 %
. . .

Item 9.01. Financial Statements and Exhibits.




(d) Exhibits.



Exhibit
  No.       Description

99.1          Irrevocable Proxy and Power of Attorney Agreement, dated as of
            September 30, 2021

104         Cover Page Interactive Data File (embedded within the Inline XBRL
            document)

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