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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">As filed with the Securities and Exchange Commission
on June&nbsp;16, 2025</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 3pt; text-align: right">Registration No.&nbsp;333-________</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: right"></P>

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<P STYLE="font: 14pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif"><B>UNITED
STATES<BR>
</B></FONT><B>SECURITIES AND EXCHANGE COMMISSION</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Washington, D.C. 20549</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 18pt"><B>FORM&nbsp;S-8</B></FONT><B><FONT STYLE="font-size: 10pt"><BR>
</FONT><FONT STYLE="font-size: 14pt">Registration Statement under<BR>
the Securities Act of 1933</FONT></B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>CENTURY ALUMINUM COMPANY</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Exact name of registrant as specified in its charter)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 55%; padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Delaware<BR>
</B></FONT>(State or other jurisdiction of incorporation or organization)</TD>
    <TD STYLE="width: 12%; padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center">&nbsp;</TD>
    <TD STYLE="width: 33%; padding-right: 5.4pt; padding-left: 5.4pt; font-size: 10pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>13-3070826<BR>
</B></FONT>(I.R.S. Employer Identification No.)</TD></TR>
  </TABLE>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>One
South Wacker Drive<BR>
Suite&nbsp;1000<BR>
Chicago,&nbsp;Illinois 60606<BR>
</B></FONT>(Address, including zip code of registrant&rsquo;s principal executive office)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 14pt"><B>Century
Aluminum Company 2025 Incentive Plan<BR>
</B></FONT><FONT STYLE="font-size: 10pt">(Full title of the plan)</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif"><B>John
DeZee<BR>
Executive Vice President, General Counsel and Secretary<BR>
Century Aluminum Company<BR>
One South Wacker Drive, Suite&nbsp;1000<BR>
Chicago,&nbsp;Illinois 60606<BR>
(312) 696-3101</B></FONT><BR>
(Name, address and telephone number, including area code, of agent for service)</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Indicate by check mark whether the registrant is a large accelerated
filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of
 &ldquo;large accelerated filer,&rdquo; &ldquo;accelerated filer,&rdquo; &ldquo;smaller reporting company&rdquo; and &ldquo;emerging growth
company&rdquo; in Rule&nbsp;12b-2 of the Exchange Act.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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    <TD STYLE="width: 35%; padding-right: 5.4pt; padding-left: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Large accelerated filer</FONT></TD>
    <TD STYLE="text-align: center; width: 3%; padding-right: 5.4pt; padding-left: 5.4pt"><FONT STYLE="font-family: Wingdings; font-size: 10pt">&#120;</FONT></TD>
    <TD STYLE="width: 12%; padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="width: 30%; padding-right: 5.4pt; padding-left: 5.4pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Accelerated filer</FONT></TD>
    <TD STYLE="color: Black; width: 20%; padding-right: 5.4pt; padding-left: 5.4pt"><FONT STYLE="font-family: Wingdings; font-size: 10pt">&#168;</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Non-Accelerated filer</FONT></TD>
    <TD STYLE="text-align: center; padding-right: 5.4pt; padding-left: 5.4pt"><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Smaller reporting company</FONT></TD>
    <TD STYLE="color: Black; padding-right: 5.4pt; padding-left: 5.4pt"><FONT STYLE="font-family: Wingdings; font-size: 10pt">o</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 0.5in">&nbsp;</TD>
    <TD STYLE="text-align: center; padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Emerging growth company</FONT></TD>
    <TD STYLE="color: Black; padding-right: 5.4pt; padding-left: 5.4pt"><FONT STYLE="font-family: Wingdings; font-size: 10pt">o</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif">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&nbsp;7(a)(2)(B)&nbsp;of the Securities Act. </FONT><FONT STYLE="font-family: Wingdings">o</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Explanatory Note</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif">This
Registration Statement relates to the registration of shares of common stock, $0.01 par value per share (the &ldquo;Common Stock&rdquo;),
of Century Aluminum Company (the &ldquo;Company&rdquo;) that may be offered from time to time under the Company&rsquo;s 2025 Incentive
Plan (the &ldquo;Plan&rdquo;). </FONT>Pursuant to the Note to Part&nbsp;I of Form&nbsp;S-8, the plan information specified by Part&nbsp;I
of Form&nbsp;S-8 is not required to be filed with the Securities and Exchange Commission (the &ldquo;SEC&rdquo;) and has been omitted
from this Registration Statement. The documents containing the information specified in Part&nbsp;I of Form&nbsp;S-8 have been or will
be provided to participants in the Plan.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Part&nbsp;II<BR>
Information Required in the Registration Statement</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Item 3. Incorporation of Documents by Reference.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The following documents filed by the Company with
the SEC are specifically incorporated by reference in this Registration Statement:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">(a)</TD><TD><A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/949157/000094915725000024/cenx-20241231.htm">Annual Report on Form&nbsp;10-K for the year ended December&nbsp;31, 2024</A> (file no. 001-34474);</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">(b)</TD><TD><A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/949157/000094915725000035/cenx-20250331.htm">Quarterly Report on Form&nbsp;10-Q for the quarter ended March&nbsp;31, 2025</A> (file no. 001-34474);</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">(c)</TD><TD>all other reports (excluding any information furnished under Items 2.02 and 7.01 therein) filed by the Company pursuant to Section&nbsp;13(a)&nbsp;or
Section&nbsp;15(d)&nbsp;of the Securities Exchange Act of 1934, as amended (the &ldquo;Exchange Act&rdquo;) since the end of the fiscal
year covered by the Annual Report referred to in clause&nbsp;(a)&nbsp;above; and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<TD STYLE="width: 0"></TD><TD STYLE="width: 0.5in">(d)</TD><TD>The description of our common stock contained in the &ldquo;Description of the Registrant&rsquo;s Securities Registered Under Section&nbsp;12
of the Securities Exchange Act of 1934&rdquo; in <A HREF="https://www.sec.gov/Archives/edgar/data/949157/000094915720000023/exhibit46-descriptiono.htm">Exhibit&nbsp;4.6</A> to the Annual Report on Form&nbsp;10-K for the year ended December&nbsp;31,
2020.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">All documents subsequently filed by the Company
pursuant to Sections&nbsp;13(a), 13(c), 14 and 15(d)&nbsp;of the Exchange Act, prior to the filing of a post-effective amendment which
indicates that all securities offered have been sold or which deregisters all securities remaining unsold, shall be deemed to be incorporated
by reference into this Registration Statement and be a part hereof from the date of filing of such documents. Any statement contained
in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for purposes
of this Registration Statement to the extent that a statement contained herein or in any subsequently filed document which also is or
is deemed to be incorporated by reference herein modifies or supersedes such statement. Any statement modified or superseded shall not
be deemed, except as so modified or superseded, to constitute a part of this Registration Statement.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Item 4. Description of Securities.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Not applicable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><FONT STYLE="font-family: Times New Roman, Times, Serif"><B>Item 5.
Interests of Named Experts and Counsel</B></FONT><B>.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Not applicable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Item 6. Indemnification of Directors and Officers.</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Century Aluminum Company is incorporated under
the Delaware General Corporation Law (&ldquo;DGCL&rdquo;).</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Section&nbsp;102(b)(7)&nbsp;of the DGCL provides
that a certificate of incorporation may contain a provision to limit the personal liability of a director to the corporation or its stockholders
for monetary damages for breach of fiduciary duties as a director, except for liability: (1)&nbsp;for any breach of the director&rsquo;s
duty of loyalty to the corporation or its stockholders, (2)&nbsp;for acts or omissions not in good faith or which involve intentional
misconduct or a knowing violation of law, (3)&nbsp;under Section&nbsp;174 of the DGCL providing for liability of directors for unlawful
payment of dividends or unlawful stock purchase or redemption, or (4)&nbsp;for any transaction from which the director derived an improper
personal benefit. The certificate of incorporation of Century Aluminum Company provides for such limitation of liability.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Section&nbsp;145 of the DGCL provides that a corporation
may indemnify any person, including officers and directors, who are, or are threatened to be made, parties to any threatened, pending
or completed legal action, suit or proceeding, whether civil, criminal, administrative or investigative (other than an action by or in
the right of such corporation), by reason of the fact that such person was an officer, director, employee or agent of such corporation,
or is or was serving at the request of such corporation as a director, officer, employee or agent of such corporation, as a director,
officer, employee or agent of another corporation. The indemnity may include expenses (including attorneys&rsquo; fees), judgments, fines
and amounts paid in settlement actually and reasonably incurred by such person in connection with such action, suit or proceeding, provided
such officer, director, employee or agent acted in good faith and in a manner he reasonably believed to be in or not opposed to the corporation&rsquo;s
best interests and, for criminal proceedings, had no reasonable cause to believe that his conduct was unlawful. A Delaware corporation
may indemnify officers and directors in an action by or in the right of the corporation under the same conditions, except that no indemnification
is permitted without judicial approval if the officer or director is adjudged to be liable to the corporation. Where an officer or director
is successful on the merits or otherwise in defense of any action referred to above, the corporation must indemnify him against the expenses
that such officer or director actually or reasonably incurred.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">The certificate of incorporation and bylaws of
Century Aluminum Company provide for indemnification to fullest extent permitted by Section&nbsp;145 of the DGCL of all persons who we
have the power to indemnify under such section. In addition, we maintain officers&rsquo; and directors&rsquo; liability insurance, which
insures against liabilities that our officers and directors may incur in such capacities.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<TD STYLE="width: 0.5in; text-align: left"><B>Item 7.</B></TD><TD STYLE="text-align: justify"><B>Exemption from Registration Claimed.</B></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Not applicable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<TD STYLE="width: 0.5in; text-align: left"><B>Item 8.</B></TD><TD STYLE="text-align: justify"><B>Exhibits.</B></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">See Index to Exhibits, which is incorporated herein
by reference.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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<TD STYLE="width: 0.5in; text-align: left"><B>Item 9.</B></TD><TD STYLE="text-align: justify"><B>Undertakings.</B></TD>
</TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(a)</FONT>&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;<FONT STYLE="font-size: 10pt">The
Company hereby undertakes:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(1)</FONT>&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;<FONT STYLE="font-size: 10pt">To
file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(i)</FONT>&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;<FONT STYLE="font-size: 10pt">To
include any prospectus required by Section&nbsp;10(a)(3)&nbsp;of the Securities Act;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(ii)</FONT>&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;<FONT STYLE="font-size: 10pt">To
reflect in the prospectus any facts or events arising after the effective date of this registration statement (or the most recent post-effective
amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in this registration
statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar volume of securities
offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range
may be reflected in the form of prospectus filed with the SEC pursuant to Rule&nbsp;424(b)&nbsp;if, in the aggregate, the changes in volume
and price represent no more than 20% change in the maximum aggregate offering price set forth in the &ldquo;Calculation of Registration
Fee&rdquo; table in the Registration Statement;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(iii)</FONT>&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;<FONT STYLE="font-size: 10pt">To
include any material information with respect to the plan of distribution not previously disclosed in this registration statement or any
material change to such information in this registration statement;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">Provided, however, that clauses&nbsp;(a)(1)(i)&nbsp;and
(a)(1)(ii)&nbsp;above do not apply if the information required to be included in a post-effective amendment by those clauses is contained
in periodic reports filed with or furnished to the SEC by the Company pursuant to Section&nbsp;13 or Section&nbsp;15(d)&nbsp;of the Exchange
Act that are incorporated by reference in this registration statement.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(2)</FONT>&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;<FONT STYLE="font-size: 10pt">That,
for the purpose of determining any liability under the Securities Act, each such post-effective amendment shall be deemed to be a new
registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to
be the initial bona fide offering thereof.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(3)</FONT>&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;<FONT STYLE="font-size: 10pt">To
remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination
of the offering.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(b)</FONT>&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;<FONT STYLE="font-size: 10pt">The
Company hereby undertakes that, for purposes of determining any liability under the Securities Act, each filing of the Company&rsquo;s
annual report pursuant to Section&nbsp;13(a)&nbsp;or 15(d)&nbsp;of the Exchange Act (and, where applicable, each filing of an employee
benefit plan&rsquo;s annual report pursuant to Section&nbsp;15(d)&nbsp;of the Exchange Act) that is incorporated by reference in this
registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering
of such securities at that time shall be deemed to be the initial bona fide offering thereof.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(c)</FONT>&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;&#8239;<FONT STYLE="font-size: 10pt">Insofar
as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers and controlling persons of
the Company pursuant to the foregoing provisions, or otherwise, the Company has been advised that in the opinion of the SEC such indemnification
is against public policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Company of expenses incurred or paid by a director, officer or controlling person
of the Company in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person
in connection with the securities being registered, the Company will, unless in the opinion of its counsel the matter has been settled
by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act and will be governed by the final adjudication of such issue.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; text-align: center; margin-top: 0pt; margin-bottom: 0pt"><B>SIGNATURES</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Pursuant to the requirements of the Securities
Act of 1933, as amended, the Company certifies that it has reasonable grounds to believe that it meets all of the requirements for filing
on Form&nbsp;S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized,
in the City of Chicago, State of Illinois on this 16<SUP>th</SUP> day of June, 2025.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD COLSPAN="2">CENTURY ALUMINUM COMPANY</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%">&nbsp;</TD>
    <TD STYLE="width: 3%">&nbsp;</TD>
    <TD STYLE="width: 47%">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">By:</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid">/s/ Jesse E. Gary</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>Jesse E. Gary</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>President and Chief Executive Officer</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Pursuant to the requirements of the Securities
Act of 1933, as amended, this Registration Statement has been signed by the following persons in the capacities indicated on this 16<SUP>th</SUP>
day of June, 2025.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR>
    <TD STYLE="text-align: center; width: 49%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><U>Signature</U></B></FONT></TD>
    <TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="text-align: center; width: 49%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><U>Title</U></B></FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
  <TR>
    <TD STYLE="border-bottom: black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/Jesse E. Gary</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">President and Chief Executive Officer, Director </FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Jesse E. Gary</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(Principal Executive Officer)</FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
  <TR>
    <TD STYLE="vertical-align: top; border-bottom: black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ Peter Trpkovski</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Executive Vice President and Chief Financial Officer</FONT></TD></TR>
  <TR>
    <TD STYLE="vertical-align: top; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Peter Trpkovski</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(Principal Financial Officer)</FONT></TD></TR>
  <TR>
    <TD STYLE="vertical-align: top; text-align: center">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
  <TR>
    <TD STYLE="vertical-align: top; border-bottom: black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/
    Robert Hoffman</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Senior Vice President, Chief Information Officer and</FONT></TD></TR>
  <TR>
    <TD STYLE="vertical-align: top; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Robert Hoffman</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Chief Accounting Officer</FONT></TD></TR>
  <TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">(Principal Accounting Officer)</FONT></TD></TR>
  <TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
  <TR>
    <TD STYLE="border-bottom: black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">*/s/
    Jarl Berntzen</FONT></TD>
    <TD>&nbsp;</TD>
    <TD ROWSPAN="2" STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Director&nbsp;</FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Jarl Berntzen</FONT></TD>
    <TD>&nbsp;</TD></TR>
  <TR>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR>
    <TD STYLE="border-bottom: black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">*/s/
    Errol Glasser</FONT></TD>
    <TD>&nbsp;</TD>
    <TD ROWSPAN="2" STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Director&nbsp;</FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Errol Glasser</FONT></TD>
    <TD>&nbsp;</TD></TR>
  <TR>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR>
    <TD STYLE="border-bottom: black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">*/s/ Wilhelm van Jaarsveld</FONT></TD>
    <TD>&nbsp;</TD>
    <TD ROWSPAN="2" STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Director&nbsp;</FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Wilhelm van Jaarsveld</FONT></TD>
    <TD>&nbsp;</TD></TR>
  <TR>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR>
    <TD STYLE="border-bottom: black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">*/s/ Andrew Michelmore</FONT></TD>
    <TD>&nbsp;</TD>
    <TD ROWSPAN="2" STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Director&nbsp;</FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Andrew Michelmore</FONT></TD>
    <TD>&nbsp;</TD></TR>
  <TR>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<!-- Field: Page; Sequence: 5 -->
    <DIV STYLE="margin-top: 12pt; margin-bottom: 6pt; border-bottom: Black 1pt solid"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR>
    <TD STYLE="text-align: center; width: 49%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><U>Signature</U></B></FONT></TD>
    <TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="text-align: center; width: 49%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><U>Title</U></B></FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
  <TR>
    <TD STYLE="border-bottom: black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">*/s/
    Jennifer Bush</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Director</FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Jennifer Bush</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
  <TR>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
  <TR>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: center">*/s/ Tamla A. Olivier</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">Director</TD></TR>
  <TR>
    <TD STYLE="text-align: center">Tamla A. Olivier</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
  </TABLE>

<P STYLE="margin: 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR>
    <TD STYLE="width: 5%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">*By:</FONT></TD>
    <TD STYLE="width: 44%; border-bottom: black 1pt solid"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/
    John DeZee</FONT></TD>
    <TD STYLE="width: 1%">&nbsp;</TD>
    <TD STYLE="width: 50%; text-align: center">&nbsp;</TD></TR>
  <TR>
    <TD COLSPAN="2" STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">John DeZee**</FONT></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR>
    <TD COLSPAN="2" STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">** By authority of the power of attorney filed herewith.</FONT></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

<!-- Field: Page; Sequence: 6 -->
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    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <!-- Field: /Page -->

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="text-transform: uppercase"><B>INDEX
TO EXHIBITS</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="width: 14%; padding-right: 5.4pt; padding-left: 5.4pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Exhibit<BR>
<U>Number</U></B></FONT></TD>
    <TD STYLE="width: 86%; padding-right: 5.4pt; padding-left: 5.4pt; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B><U>Description</U></B></FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 10pt; padding-right: 5.4pt; padding-left: 5.4pt; text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/949157/000094915712000071/cenx-9302012xex31.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">4.1</FONT></A></TD>
    <TD STYLE="padding-bottom: 10pt; padding-right: 5.4pt; padding-left: 5.4pt"><A HREF="https://www.sec.gov/Archives/edgar/data/949157/000094915712000071/cenx-9302012xex31.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Amended and Restated Certificate of Incorporation of the Company, as amended (incorporated herein by reference to Exhibit&nbsp;3.1 to the Company&rsquo;s Quarterly Report on Form&nbsp;10-Q filed with the SEC on November&nbsp;9, 2012).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 10pt; padding-right: 5.4pt; padding-left: 5.4pt; text-align: center"><A HREF="https://www.sec.gov/Archives/edgar/data/949157/000094915719000134/exhibit31-amendedandre.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">4.2</FONT></A></TD>
    <TD STYLE="padding-bottom: 10pt; padding-right: 5.4pt; padding-left: 5.4pt"><A HREF="https://www.sec.gov/Archives/edgar/data/949157/000094915719000134/exhibit31-amendedandre.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Amended and Restated Bylaws of the Company (incorporated herein by reference to Exhibit&nbsp;3.1 to the Company&rsquo;s Current Report on Form&nbsp;8-K filed with the SEC on December&nbsp;6, 2019).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 10pt; padding-right: 5.4pt; padding-left: 5.4pt; text-align: center"><A HREF="tm2518038d1_ex5.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">5</FONT></A></TD>
    <TD STYLE="padding-bottom: 10pt; padding-right: 5.4pt; padding-left: 5.4pt"><A HREF="tm2518038d1_ex5.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Opinion of Vedder Price P.C.*</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 10pt; padding-right: 5.4pt; padding-left: 5.4pt; text-align: center"><A HREF="tm2518038d1_ex23-1.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">23.1</FONT></A></TD>
    <TD STYLE="padding-bottom: 10pt; padding-right: 5.4pt; padding-left: 5.4pt"><A HREF="tm2518038d1_ex23-1.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Consent of Independent Registered Public Accounting Firm (Deloitte&nbsp;&amp; Touche LLP).*</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 10pt; padding-right: 5.4pt; padding-left: 5.4pt; text-align: center"><A HREF="tm2518038d1_ex5.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">23.2</FONT></A></TD>
    <TD STYLE="padding-bottom: 10pt; padding-right: 5.4pt; padding-left: 5.4pt"><A HREF="tm2518038d1_ex5.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Consent of Vedder Price P.C. (included in Exhibit&nbsp;5 to the Registration Statement).</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 10pt; padding-right: 5.4pt; padding-left: 5.4pt; text-align: center"><A HREF="tm2518038d1_ex24.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">24</FONT></A></TD>
    <TD STYLE="padding-bottom: 10pt; padding-right: 5.4pt; padding-left: 5.4pt"><A HREF="tm2518038d1_ex24.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Power of Attorney.*</FONT></A></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center"><A HREF="tm2518038d1_ex99-1.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">99.1</FONT></A></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt"><A HREF="tm2518038d1_ex99-1.htm"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Century Aluminum Company 2025 Incentive Plan*</FONT></A></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center">&nbsp;</TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">&nbsp;</TD></TR>
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    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: center"><A HREF="tm2518038d1_ex-filingfees.htm">107*</A></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt"><A HREF="tm2518038d1_ex-filingfees.htm">Filing Fee Table.</A></TD></TR>
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<P STYLE="margin: 0">* Filed herewith.</P>

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[{"type": "S-8", "sequence": "1", "filename": "tm2518038d1_s8.htm", "description": "FORM S-8", "secsgml_size_bytes": 48768}]
{"company-data": {"conformed-name": "CENTURY ALUMINUM CO", "cik": "0000949157", "assigned-sic": "3334", "organization-name": "04 Manufacturing", "ein": "133070826", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-288080", "film-number": "251050194"}, "business-address": {"street1": "1 SOUTH WACKER DRIVE", "street2": "SUITE 1000", "city": "CHICAGO", "state": "IL", "zip": "60606", "phone": "3126963101"}, "mail-address": {"street1": "1 SOUTH WACKER DRIVE", "street2": "SUITE 1000", "city": "CHICAGO", "state": "IL", "zip": "60606"}}
As filed with the Securities and Exchange Commission
on June 16, 2025
Registration No. 333-________
UNITED
STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM S-8
Registration Statement under
the Securities Act of 1933
CENTURY ALUMINUM COMPANY
(Exact name of registrant as specified in its charter)
Delaware
(State or other jurisdiction of incorporation or organization)
13-3070826
(I.R.S. Employer Identification No.)
One
South Wacker Drive
Suite 1000
Chicago, Illinois 60606
(Address, including zip code of registrant's principal executive office)
Century
Aluminum Company 2025 Incentive Plan
(Full title of the plan)
John
DeZee
Executive Vice President, General Counsel and Secretary
Century Aluminum Company
One South Wacker Drive, Suite 1000
Chicago, Illinois 60606
(312) 696-3101
(Name, address and telephone number, including area code, of agent for service)
Indicate by check mark whether the registrant is a large accelerated
filer, an accelerated filer, a non-accelerated filer, a smaller reporting company or an emerging growth company. See the definitions of
 "large accelerated filer," "accelerated filer," "smaller reporting company" and "emerging growth
company" in Rule 12b-2 of the Exchange Act.
Large accelerated filer
x
Accelerated filer
¨
Non-Accelerated filer
¨
Smaller reporting company
o
Emerging growth company
o
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 7(a)(2)(B) of the Securities Act.
o
Explanatory Note
This
Registration Statement relates to the registration of shares of common stock, $0.01 par value per share (the "Common Stock"),
of Century Aluminum Company (the "Company") that may be offered from time to time under the Company's 2025 Incentive
Plan (the "Plan").
Pursuant to the Note to Part I of Form S-8, the plan information specified by Part I
of Form S-8 is not required to be filed with the Securities and Exchange Commission (the "SEC") and has been omitted
from this Registration Statement. The documents containing the information specified in Part I of Form S-8 have been or will
be provided to participants in the Plan.
Part II
Information Required in the Registration Statement
Item 3. Incorporation of Documents by Reference.
The following documents filed by the Company with
the SEC are specifically incorporated by reference in this Registration Statement:
(a)
Annual Report on Form 10-K for the year ended December 31, 2024
(file no. 001-34474);
(b)
Quarterly Report on Form 10-Q for the quarter ended March 31, 2025
(file no. 001-34474);
(c)
all other reports (excluding any information furnished under Items 2.02 and 7.01 therein) filed by the Company pursuant to Section 13(a) or
Section 15(d) of the Securities Exchange Act of 1934, as amended (the "Exchange Act") since the end of the fiscal
year covered by the Annual Report referred to in clause (a) above; and
(d)
The description of our common stock contained in the "Description of the Registrant's Securities Registered Under Section 12
of the Securities Exchange Act of 1934" in
Exhibit 4.6
to the Annual Report on Form 10-K for the year ended December 31,
2020.
All documents subsequently filed by the Company
pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act, prior to the filing of a post-effective amendment which
indicates that all securities offered have been sold or which deregisters all securities remaining unsold, shall be deemed to be incorporated
by reference into this Registration Statement and be a part hereof from the date of filing of such documents. Any statement contained
in a document incorporated or deemed to be incorporated by reference herein shall be deemed to be modified or superseded for purposes
of this Registration Statement to the extent that a statement contained herein or in any subsequently filed document which also is or
is deemed to be incorporated by reference herein modifies or supersedes such statement. Any statement modified or superseded shall not
be deemed, except as so modified or superseded, to constitute a part of this Registration Statement.
Item 4. Description of Securities.
Not applicable.
Item 5.
Interests of Named Experts and Counsel
.
Not applicable.
Item 6. Indemnification of Directors and Officers.
Century Aluminum Company is incorporated under
the Delaware General Corporation Law ("DGCL").
Section 102(b)(7) of the DGCL provides
that a certificate of incorporation may contain a provision to limit the personal liability of a director to the corporation or its stockholders
for monetary damages for breach of fiduciary duties as a director, except for liability: (1) for any breach of the director's
duty of loyalty to the corporation or its stockholders, (2) for acts or omissions not in good faith or which involve intentional
misconduct or a knowing violation of law, (3) under Section 174 of the DGCL providing for liability of directors for unlawful
payment of dividends or unlawful stock purchase or redemption, or (4) for any transaction from which the director derived an improper
personal benefit. The certificate of incorporation of Century Aluminum Company provides for such limitation of liability.
Section 145 of the DGCL provides that a corporation
may indemnify any person, including officers and directors, who are, or are threatened to be made, parties to any threatened, pending
or completed legal action, suit or proceeding, whether civil, criminal, administrative or investigative (other than an action by or in
the right of such corporation), by reason of the fact that such person was an officer, director, employee or agent of such corporation,
or is or was serving at the request of such corporation as a director, officer, employee or agent of such corporation, as a director,
officer, employee or agent of another corporation. The indemnity may include expenses (including attorneys' fees), judgments, fines
and amounts paid in settlement actually and reasonably incurred by such person in connection with such action, suit or proceeding, provided
such officer, director, employee or agent acted in good faith and in a manner he reasonably believed to be in or not opposed to the corporation's
best interests and, for criminal proceedings, had no reasonable cause to believe that his conduct was unlawful. A Delaware corporation
may indemnify officers and directors in an action by or in the right of the corporation under the same conditions, except that no indemnification
is permitted without judicial approval if the officer or director is adjudged to be liable to the corporation. Where an officer or director
is successful on the merits or otherwise in defense of any action referred to above, the corporation must indemnify him against the expenses
that such officer or director actually or reasonably incurred.
The certificate of incorporation and bylaws of
Century Aluminum Company provide for indemnification to fullest extent permitted by Section 145 of the DGCL of all persons who we
have the power to indemnify under such section. In addition, we maintain officers' and directors' liability insurance, which
insures against liabilities that our officers and directors may incur in such capacities.
Item 7.
Exemption from Registration Claimed.
Not applicable.
Item 8.
Exhibits.
See Index to Exhibits, which is incorporated herein
by reference.
Item 9.
Undertakings.
(a)
The
Company hereby undertakes:
(1)
To
file, during any period in which offers or sales are being made, a post-effective amendment to this registration statement:
(i)
To
include any prospectus required by Section 10(a)(3) of the Securities Act;
2
(ii)
To
reflect in the prospectus any facts or events arising after the effective date of this registration statement (or the most recent post-effective
amendment thereof) which, individually or in the aggregate, represent a fundamental change in the information set forth in this registration
statement. Notwithstanding the foregoing, any increase or decrease in volume of securities offered (if the total dollar volume of securities
offered would not exceed that which was registered) and any deviation from the low or high end of the estimated maximum offering range
may be reflected in the form of prospectus filed with the SEC pursuant to Rule 424(b) if, in the aggregate, the changes in volume
and price represent no more than 20% change in the maximum aggregate offering price set forth in the "Calculation of Registration
Fee" table in the Registration Statement;
(iii)
To
include any material information with respect to the plan of distribution not previously disclosed in this registration statement or any
material change to such information in this registration statement;
Provided, however, that clauses (a)(1)(i) and
(a)(1)(ii) above do not apply if the information required to be included in a post-effective amendment by those clauses is contained
in periodic reports filed with or furnished to the SEC by the Company pursuant to Section 13 or Section 15(d) of the Exchange
Act that are incorporated by reference in this registration statement.
(2)
That,
for the purpose of determining any liability under the Securities Act, each such post-effective amendment shall be deemed to be a new
registration statement relating to the securities offered therein, and the offering of such securities at that time shall be deemed to
be the initial bona fide offering thereof.
(3)
To
remove from registration by means of a post-effective amendment any of the securities being registered which remain unsold at the termination
of the offering.
(b)
The
Company hereby undertakes that, for purposes of determining any liability under the Securities Act, each filing of the Company's
annual report pursuant to Section 13(a) or 15(d) of the Exchange Act (and, where applicable, each filing of an employee
benefit plan's annual report pursuant to Section 15(d) of the Exchange Act) that is incorporated by reference in this
registration statement shall be deemed to be a new registration statement relating to the securities offered therein, and the offering
of such securities at that time shall be deemed to be the initial bona fide offering thereof.
(c)
Insofar
as indemnification for liabilities arising under the Securities Act may be permitted to directors, officers and controlling persons of
the Company pursuant to the foregoing provisions, or otherwise, the Company has been advised that in the opinion of the SEC such indemnification
is against public policy as expressed in the Securities Act and is, therefore, unenforceable. In the event that a claim for indemnification
against such liabilities (other than the payment by the Company of expenses incurred or paid by a director, officer or controlling person
of the Company in the successful defense of any action, suit or proceeding) is asserted by such director, officer or controlling person
in connection with the securities being registered, the Company will, unless in the opinion of its counsel the matter has been settled
by controlling precedent, submit to a court of appropriate jurisdiction the question whether such indemnification by it is against public
policy as expressed in the Securities Act and will be governed by the final adjudication of such issue.
3
SIGNATURES
Pursuant to the requirements of the Securities
Act of 1933, as amended, the Company certifies that it has reasonable grounds to believe that it meets all of the requirements for filing
on Form S-8 and has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized,
in the City of Chicago, State of Illinois on this 16
th
day of June, 2025.
CENTURY ALUMINUM COMPANY
By:
/s/ Jesse E. Gary
Jesse E. Gary
President and Chief Executive Officer
Pursuant to the requirements of the Securities
Act of 1933, as amended, this Registration Statement has been signed by the following persons in the capacities indicated on this 16
th
day of June, 2025.
Signature
Title
/s/Jesse E. Gary
President and Chief Executive Officer, Director
Jesse E. Gary
(Principal Executive Officer)
/s/ Peter Trpkovski
Executive Vice President and Chief Financial Officer
Peter Trpkovski
(Principal Financial Officer)
/s/
    Robert Hoffman
Senior Vice President, Chief Information Officer and
Robert Hoffman
Chief Accounting Officer
(Principal Accounting Officer)
*/s/
    Jarl Berntzen
Director
Jarl Berntzen
*/s/
    Errol Glasser
Director
Errol Glasser
*/s/ Wilhelm van Jaarsveld
Director
Wilhelm van Jaarsveld
*/s/ Andrew Michelmore
Director
Andrew Michelmore
Signature
Title
*/s/
    Jennifer Bush
Director
Jennifer Bush
*/s/ Tamla A. Olivier
Director
Tamla A. Olivier
*By:
/s/
    John DeZee
John DeZee**
** By authority of the power of attorney filed herewith.
INDEX
TO EXHIBITS
Exhibit
Number
Description
4.1
Amended and Restated Certificate of Incorporation of the Company, as amended (incorporated herein by reference to Exhibit 3.1 to the Company's Quarterly Report on Form 10-Q filed with the SEC on November 9, 2012).
4.2
Amended and Restated Bylaws of the Company (incorporated herein by reference to Exhibit 3.1 to the Company's Current Report on Form 8-K filed with the SEC on December 6, 2019).
5
Opinion of Vedder Price P.C.*
23.1
Consent of Independent Registered Public Accounting Firm (Deloitte & Touche LLP).*
23.2
Consent of Vedder Price P.C. (included in Exhibit 5 to the Registration Statement).
24
Power of Attorney.*
99.1
Century Aluminum Company 2025 Incentive Plan*
107*
Filing Fee Table.
* Filed herewith.