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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>As filed with the Securities and Exchange Commission
on May 8, 2025</B></P>

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

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

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

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>UNITED STATES</B></P>

<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><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; text-align: center">&nbsp;</P>

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



<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>FORM S-8</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="text-transform: uppercase"><I>&#8239;<B>Under</B></I></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><FONT STYLE="text-transform: uppercase"><B><I>THE
SECURITIES ACT OF 1933</I></B></FONT></P>

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

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



<P STYLE="font: 18pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>ASPEN AEROGELS, INC. </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="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 60%; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>Delaware</B></FONT></TD>
    <TD STYLE="width: 40%; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>04-3559972</B></FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt">(State or other jurisdiction of incorporation or organization)</FONT></TD>
    <TD STYLE="font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt">(I.R.S. Employer Identification No.)</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>30 Forbes Road, Building B </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Northborough, Massachusetts 01532 </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Address of Principal Executive Offices) (Zip Code)</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Aspen Aerogels Amended and Restated 2023 Equity
Incentive Plan </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Full title of the plan)</P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>President and Chief Executive Officer </B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>30 Forbes Road, Building B </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Northborough, Massachusetts 01532 </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(508)&nbsp;691-1111&nbsp;</B></P>

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

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>3900 Key Center</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>127 Public Square</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Cleveland, Ohio 44114</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(216) 566-5500</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: justify">Indicate by check mark whether the registrant
is a large accelerated filer, an accelerated filer, a&nbsp;non-accelerated&nbsp;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&nbsp;of the Exchange Act.</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 STYLE="vertical-align: bottom">
    <TD STYLE="width: 45%"><FONT STYLE="font-size: 10pt">Large&nbsp;accelerated&nbsp;filer</FONT></TD>
    <TD STYLE="width: 5%"><FONT STYLE="font-family: Wingdings">&#120;</FONT></TD>
    <TD STYLE="width: 45%"><FONT STYLE="font-size: 10pt">Accelerated&nbsp;filer</FONT></TD>
    <TD STYLE="width: 5%"><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD><FONT STYLE="font-size: 10pt">Non-accelerated filer</FONT></TD>
    <TD><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">Smaller&nbsp;reporting&nbsp;company</FONT></TD>
    <TD><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD></TR>
  <TR STYLE="vertical-align: bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">Emerging&nbsp;growth&nbsp;company</FONT></TD>
    <TD><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">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) of the Securities Act.&nbsp;&nbsp;<FONT STYLE="font-family: Wingdings">&#168;</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"></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; text-align: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">Aspen Aerogels, Inc. (the &ldquo;Registrant&rdquo;)
is filing this Registration Statement on Form S-8 (the &ldquo;Registration Statement&rdquo;) with the Securities and Exchange Commission
(the &ldquo;Commission&rdquo;) to register the offering of an additional 3,850,000 shares of common stock, par value $0.00001 per share
(&ldquo;Common Stock&rdquo;), of the Registrant, which are issuable under the Aspen Aerogels Amended and Restated 2023 Equity Incentive
Plan (the &ldquo;Plan&rdquo;) as a result of an increase to the reserve under the Plan, as approved by the Registrant&rsquo;s stockholders
at the Registrant&rsquo;s annual meeting of stockholders held on April 30, 2025.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">The additional shares of Common Stock issuable
pursuant to the Plan are securities of the same class as other securities for which a Registration Statement on Form S-8 was filed with
the Commission on June 1, 2023 (File No. <A HREF="https://www.sec.gov/Archives/edgar/data/1145986/000119312523159061/d448892ds8.htm">333-272346</A>) (the &ldquo;Prior Registration Statement&rdquo;). Accordingly, the contents of the
Prior Registration Statement are incorporated by reference into this Registration Statement pursuant to General Instruction E of Form
S-8, except to the extent supplemented, amended or superseded by the information set forth below.</P>

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>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&nbsp;3. Incorporation of Documents by Reference. </B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">The following documents, which have previously
been filed by the Registrant with the Commission pursuant to the Securities Exchange Act of 1934, as amended (the &ldquo;Exchange Act&rdquo;)
are incorporated herein by reference:</P>

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

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD>the Registrant&rsquo;s <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1145986/000095017025029252/aspn-20241231.htm">Annual Report on Form 10-K for the fiscal year ended December&nbsp;31, 2024</A>, filed with the Commission on February
27, 2025 (including the information incorporated by reference therein from the <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1145986/000095017025040250/aspn-20250317.htm">Registrant&rsquo;s Definitive Proxy Statement on Schedule 14A</A>, filed with the Commission on March 17, 2025);</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" STYLE="width: 100%; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 0.25in">&nbsp;</TD>
    <TD STYLE="font-size: 10pt; width: 0.25in"><FONT STYLE="font-family: Symbol; font-size: 10pt">&middot;</FONT></TD>
    <TD STYLE="font-size: 10pt"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">the Registrant&rsquo;s <A HREF="https://www.sec.gov/Archives/edgar/data/1145986/000095017025066992/aspn-20250331.htm" STYLE="-sec-extract: exhibit">Quarterly
    Report on Form 10-Q for the quarter ended March 31, 2025</A>, filed with the Commission on May 8, 2025;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</FONT></TD></TR>
  </TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">the
                                            Registrant&rsquo;s Current Reports on Form 8-K filed with the Commission on <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1145986/000117184325000772/f8k_021225.htm">February
                                            12, 2025</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1145986/000095017025034656/aspn-20250304.htm">March
                                            6, 2025</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1145986/000095017025035506/aspn-20250304.htm">March
                                            7, 2025</A>, <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/1145986/000095017025061852/aspn-20250430.htm">May
                                            1, 2025</A> and <A HREF="https://www.sec.gov/ix?doc=/Archives/edgar/data/0001145986/000117184325002948/f8k_050825.htm" STYLE="-sec-extract: exhibit">May
                                            8, 2025</A> (excluding any information furnished in such reports under Item 2.02, Item 7.01
                                            or Item 9.01); and</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in; text-align: justify">&nbsp;</P>

<TABLE CELLPADDING="0" CELLSPACING="0" WIDTH="100%" STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt"><TR STYLE="vertical-align: top">
<TD STYLE="width: 0.25in"></TD><TD STYLE="width: 0.25in"><FONT STYLE="font-family: Symbol">&middot;</FONT></TD><TD STYLE="text-align: justify">the description of the Registrant&rsquo;s common stock set forth in <A HREF="https://www.sec.gov/Archives/edgar/data/1145986/000156459020009181/aspn-ex43_89.htm">Exhibit 4.3</A> of the Registrant&rsquo;s
Annual Report on Form 10-K for the year ended December 31, 2019, together with any amendment or report filed with the Commission for the
purpose of updating such description.</TD></TR></TABLE>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">All documents filed by the Registrant with the
Commission pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act (other than those furnished pursuant to Item 2.02 or Item
7.01 of Form 8-K or other information &ldquo;furnished&rdquo; to the Commission) subsequent to the filing of this Registration Statement
and prior to the filing of a post-effective amendment that indicates that all securities offered have been sold or that deregisters all
securities then remaining unsold will be deemed to be incorporated by reference in this Registration Statement and to be part hereof from
the date of filing of such documents. Any statement contained in any document incorporated or deemed to be incorporated by reference herein
will be deemed to be modified or superseded for purposes of this Registration Statement to the extent that a statement contained herein
or in any other subsequently filed document that also is or is deemed to be incorporated by reference herein modifies or supersedes such
statement. Any such statement so modified or superseded will not be deemed, except as 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"></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Item&nbsp;8. Exhibits. </B></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="white-space: nowrap; vertical-align: top; width: 9%"><FONT STYLE="font-size: 10pt"><B><U>Exhibit No.</U></B></FONT></TD>
    <TD STYLE="vertical-align: bottom; width: 1%"><FONT STYLE="font-size: 10pt"><B>&nbsp;</B></FONT></TD>
    <TD STYLE="text-align: justify; vertical-align: top; width: 90%"><FONT STYLE="font-size: 10pt"><B><U>Description</U></B></FONT></TD></TR>
  <TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="white-space: nowrap; vertical-align: top"><A HREF="https://www.sec.gov/Archives/edgar/data/1145986/000119312514241484/d744800dex32.htm"><FONT STYLE="font-size: 10pt">4.1</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="text-align: justify; vertical-align: top"><A HREF="https://www.sec.gov/Archives/edgar/data/1145986/000119312514241484/d744800dex32.htm"><FONT STYLE="font-size: 10pt">Restated Certificate of Incorporation of the Registrant (incorporated herein by reference to Exhibit 3.2 to the Registrant&rsquo;s Current Report on Form 8-K filed on June 19, 2014).</FONT></A></TD></TR>
  <TR STYLE="background-color: White">
    <TD STYLE="white-space: nowrap; vertical-align: top"><A HREF="https://www.sec.gov/Archives/edgar/data/1145986/000095017023025706/aspn-ex3_1.htm"><FONT STYLE="font-size: 10pt">4.2</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="text-align: justify; vertical-align: top"><A HREF="https://www.sec.gov/Archives/edgar/data/1145986/000095017023025706/aspn-ex3_1.htm"><FONT STYLE="font-size: 10pt">Certificate of Amendment to the Restated Certificate of Incorporation (incorporated herein by reference to Exhibit 3.1 to the Registrant&rsquo;s Current Report on Form 8-K filed on June 1, 2023).</FONT></A></TD></TR>
  <TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="white-space: nowrap; vertical-align: top"><A HREF="https://www.sec.gov/Archives/edgar/data/1145986/000095017024028127/aspn-ex3_2.htm"><FONT STYLE="font-size: 10pt">4.3</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="text-align: justify; vertical-align: bottom"><A HREF="https://www.sec.gov/Archives/edgar/data/1145986/000095017024028127/aspn-ex3_2.htm"><FONT STYLE="font-size: 10pt">Amended and Restated Bylaws (effective November 8, 2023) (incorporated herein by reference to Exhibit 3.2 to the Registrant&rsquo;s Annual Report on Form 10-K filed on March 7, 2024).</FONT></A></TD></TR>
  <TR STYLE="background-color: White">
    <TD STYLE="white-space: nowrap; vertical-align: top"><A HREF="tm2513955d2_ex5-1.htm"><FONT STYLE="font-size: 10pt">5.1</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="text-align: justify; vertical-align: top"><A HREF="tm2513955d2_ex5-1.htm"><FONT STYLE="font-size: 10pt">Opinion of Thompson Hine LLP.</FONT></A></TD></TR>
  <TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="white-space: nowrap; vertical-align: top"><A HREF="tm2513955d2_ex23-1.htm"><FONT STYLE="font-size: 10pt">23.1</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="text-align: justify; vertical-align: top"><A HREF="tm2513955d2_ex23-1.htm"><FONT STYLE="font-size: 10pt">Consent of Independent Registered Public Accounting Firm.</FONT></A></TD></TR>
  <TR STYLE="background-color: White">
    <TD STYLE="white-space: nowrap; vertical-align: top"><A HREF="tm2513955d2_ex5-1.htm"><FONT STYLE="font-size: 10pt">23.2</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="text-align: justify; vertical-align: top"><A HREF="tm2513955d2_ex5-1.htm"><FONT STYLE="font-size: 10pt">Consent of Thompson Hine LLP (included in Exhibit 5.1).</FONT></A></TD></TR>
  <TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="white-space: nowrap; vertical-align: top"><A HREF="#m_001"><FONT STYLE="font-size: 10pt">24.1</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="text-align: justify; vertical-align: top"><A HREF="#m_001"><FONT STYLE="font-size: 10pt">Power of Attorney (included on the signature page to this Registration Statement).</FONT></A></TD></TR>
  <TR STYLE="background-color: White">
    <TD STYLE="white-space: nowrap; vertical-align: top"><A HREF="https://www.sec.gov/Archives/edgar/data/1145986/000095017025061852/aspn-ex10_1.htm"><FONT STYLE="font-size: 10pt">99.1</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="text-align: justify; vertical-align: top"><A HREF="https://www.sec.gov/Archives/edgar/data/1145986/000095017025061852/aspn-ex10_1.htm"><FONT STYLE="font-size: 10pt">Aspen Aerogels Amended and Restated 2023 Equity Incentive Plan (incorporated herein by reference to Exhibit 10.1 to the Registrant&rsquo;s Current Report on Form 8-K filed with the SEC on May 1, 2025).</FONT></A></TD></TR>
  <TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="white-space: nowrap; vertical-align: top"><A HREF="https://www.sec.gov/Archives/edgar/data/1145986/000095017023025706/aspn-ex10_2.htm"><FONT STYLE="font-size: 10pt">99.2</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="text-align: justify; vertical-align: top"><A HREF="https://www.sec.gov/Archives/edgar/data/1145986/000095017023025706/aspn-ex10_2.htm"><FONT STYLE="font-size: 10pt">Form of Stock Option Agreement under Aspen Aerogels 2023 Equity Incentive Plan (incorporated herein by reference to Exhibit 10.2 to the Registrant&rsquo;s Current Report on Form 8-K filed with the SEC on June 1, 2023).</FONT></A></TD></TR>
  <TR STYLE="background-color: White">
    <TD STYLE="white-space: nowrap; vertical-align: top"><A HREF="https://www.sec.gov/Archives/edgar/data/1145986/000095017023025706/aspn-ex10_3.htm"><FONT STYLE="font-size: 10pt">99.3</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="text-align: justify; vertical-align: top"><A HREF="https://www.sec.gov/Archives/edgar/data/1145986/000095017023025706/aspn-ex10_3.htm"><FONT STYLE="font-size: 10pt">Form of Restricted Stock Unit Agreement for Executive Officers under Aspen Aerogels 2023 Equity Incentive Plan (incorporated herein by reference to Exhibit 10.3 to the Registrant&rsquo;s Current Report on Form 8-K filed with the SEC on June 1, 2023).</FONT></A></TD></TR>
  <TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="white-space: nowrap; vertical-align: top"><A HREF="https://www.sec.gov/Archives/edgar/data/1145986/000095017023025706/aspn-ex10_4.htm"><FONT STYLE="font-size: 10pt">99.4</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="text-align: justify; vertical-align: top"><A HREF="https://www.sec.gov/Archives/edgar/data/1145986/000095017023025706/aspn-ex10_4.htm"><FONT STYLE="font-size: 10pt">Form of Restricted Stock Agreement for Directors under Aspen Aerogels 2023 Equity Incentive Plan (incorporated herein by reference to Exhibit 10.4 to the Registrant&rsquo;s Current Report on Form 8-K filed with the SEC on June 1, 2023).</FONT></A></TD></TR>
  <TR STYLE="background-color: White">
    <TD STYLE="white-space: nowrap; vertical-align: top"><A HREF="https://www.sec.gov/Archives/edgar/data/1145986/000095017023025706/aspn-ex10_5.htm"><FONT STYLE="font-size: 10pt">99.5</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="text-align: justify; vertical-align: top"><A HREF="https://www.sec.gov/Archives/edgar/data/1145986/000095017023025706/aspn-ex10_5.htm"><FONT STYLE="font-size: 10pt">Form of Director Stock Option Agreement under Aspen Aerogels 2023 Equity Incentive Plan (incorporated herein by reference to Exhibit 10.5 to the Registrant&rsquo;s Current Report on Form 8-K filed with the SEC on June 1, 2023).</FONT></A></TD></TR>
  <TR STYLE="background-color: rgb(204,238,255)">
    <TD STYLE="white-space: nowrap; vertical-align: top"><A HREF="tm2513955d2_ex-filingfees.htm"><FONT STYLE="font-size: 10pt">107</FONT></A></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="text-align: justify; vertical-align: top"><A HREF="tm2513955d2_ex-filingfees.htm"><FONT STYLE="font-size: 10pt">Filing Fee Table.</FONT></A></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-align: justify"></P>

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




<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B><A NAME="m_001"></A>SIGNATURES </B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">Pursuant to the requirements of the Securities
Act of 1933, the Registrant certifies that it has reasonable grounds to believe that it meets all of the requirements for filing on Form&nbsp;S-8&nbsp;and
has duly caused this Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized, in the city of Northborough,
state of Massachusetts on May 8, 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 STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD COLSPAN="2"><FONT STYLE="font-size: 10pt"><B>ASPEN AEROGELS, INC.</B></FONT></TD>
    </TR>
  <TR>
    <TD STYLE="width: 50%">&nbsp;</TD>
    <TD STYLE="width: 3%">&nbsp;</TD>
    <TD STYLE="width: 47%">&nbsp;</TD>
    </TR>
  <TR>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: top"><FONT STYLE="font-size: 10pt">By</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid; vertical-align: bottom"><FONT STYLE="font-size: 10pt">/s/ Donald R. Young</FONT></TD>
    </TR>
  <TR>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom"><FONT STYLE="font-size: 10pt">Donald R. Young</FONT></TD>
    </TR>
  <TR>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD STYLE="vertical-align: bottom"><FONT STYLE="font-size: 10pt">President and Chief Executive Officer</FONT></TD>
    </TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">Each person whose signature appears below constitutes
and appoints Donald R. Young, Ricardo C. Rodriguez and Virginia H. Johnson, and each of them singly, his or her true and lawful&nbsp;attorneys-in-fact&nbsp;and
agents, with full power of substitution and resubstitution in each of them singly, for him or her and in his or her name, place and stead,
and in any and all capacities, to sign any and all amendments (including post-effective amendments) to this Registration Statement on
Form&nbsp;S-8&nbsp;of Aspen Aerogels, Inc., and to file the same, with all exhibits thereto and other documents in connection therewith,
with the Securities and Exchange Commission, granting to the&nbsp;attorneys-in-fact&nbsp;and agents, and each of them, full power and
authority to do and perform each and every act and thing requisite or necessary to be done in or about the premises, as full to all intents
and purposes as he might or could do in person, hereby ratifying and confirming all that the&nbsp;attorneys-in-fact&nbsp;and agents or
any of each of them or their substitute may lawfully do or cause to be done by virtue hereof.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">Pursuant to the requirements of the Securities
Act of 1933, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated.</P>

<P STYLE="text-align: center; font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt">&nbsp;<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: bottom">
    <TD STYLE="border-bottom: Black 1pt solid; white-space: nowrap; text-align: center; width: 28%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Signature</B></FONT></TD>
    <TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: center; width: 50%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Title</B></FONT></TD>
    <TD STYLE="width: 2%">&nbsp;</TD>
    <TD STYLE="border-bottom: Black 1pt solid; text-align: center; width: 18%"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt"><B>Date</B></FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: Black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ Donald R. Young </FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">President, Chief Executive Officer and Director </FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">May 8, 2025</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Donald R. Young</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>
    <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>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: Black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ Ricardo C. Rodriguez </FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Chief Financial Officer and Treasurer </FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">May 8, 2025</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Ricardo C. Rodriguez </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>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ Santhosh P. Daniel</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>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">May 8, 2025</FONT></TD></TR>
  <TR>
    <TD STYLE="vertical-align: top; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Santhosh P. Daniel</FONT></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>
    <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>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: Black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ William P. Noglows </FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Chairperson of the Board</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">May 8, 2025</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">William P. Noglows</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</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>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: Black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ Steven R. Mitchell </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>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">May 8, 2025</FONT></TD></TR>
  <TR>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Steven R. Mitchell</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</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>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: Black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ James E. Sweetnam </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>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">May 8, 2025</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">James E. Sweetnam </FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</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>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: Black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ Kathleen M. Kool </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>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">May 8, 2025</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Kathleen M. Kool </FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: black 1pt solid; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">/s/ Cari Robinson</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>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">May 8, 2025</FONT></TD></TR>
  <TR>
    <TD STYLE="vertical-align: top; text-align: center"><FONT STYLE="font-family: Times New Roman, Times, Serif; font-size: 10pt">Cari Robinson</FONT></TD>
    <TD>&nbsp;</TD>
    <TD STYLE="text-align: center">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: top; text-align: center">&nbsp;</TD></TR>
  </TABLE>
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[{"type": "S-8", "sequence": "1", "filename": "tm2513955d2_s8.htm", "description": "FORM S-8", "secsgml_size_bytes": 40968}]
{"company-data": {"conformed-name": "ASPEN AEROGELS INC", "cik": "0001145986", "assigned-sic": "5030", "organization-name": "07 Trade & Services", "ein": "043559972", "state-of-incorporation": "DE", "fiscal-year-end": "1231"}, "filing-values": {"form-type": "S-8", "act": "33", "file-number": "333-287098", "film-number": "25927315"}, "business-address": {"street1": "30 FORBES ROAD", "street2": "BUILDING B", "city": "NORTHBOROUGH", "state": "MA", "zip": "01532", "phone": "5086911111"}, "mail-address": {"street1": "30 FORBES ROAD", "street2": "BUILDING B", "city": "NORTHBOROUGH", "state": "MA", "zip": "01532"}}
As filed with the Securities and Exchange Commission
on May 8, 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
ASPEN AEROGELS, INC.
(Exact name of registrant as specified in its charter)
Delaware
04-3559972
(State or other jurisdiction of incorporation or organization)
(I.R.S. Employer Identification No.)
30 Forbes Road, Building B
Northborough, Massachusetts 01532
(Address of Principal Executive Offices) (Zip Code)
Aspen Aerogels Amended and Restated 2023 Equity
Incentive Plan
(Full title of the plan)
Donald R. Young
President and Chief Executive Officer
Aspen Aerogels, Inc.
30 Forbes Road, Building B
Northborough, Massachusetts 01532
(508) 691-1111
(Name, address and telephone number, including
area code, of agent for service)
Copies to:
Jurgita Ashley
Thompson Hine LLP
3900 Key Center
127 Public Square
Cleveland, Ohio 44114
(216) 566-5500
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
¨
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 7(a)(2)(B) of the Securities Act.
¨
EXPLANATORY NOTE
Aspen Aerogels, Inc. (the "Registrant")
is filing this Registration Statement on Form S-8 (the "Registration Statement") with the Securities and Exchange Commission
(the "Commission") to register the offering of an additional 3,850,000 shares of common stock, par value $0.00001 per share
("Common Stock"), of the Registrant, which are issuable under the Aspen Aerogels Amended and Restated 2023 Equity Incentive
Plan (the "Plan") as a result of an increase to the reserve under the Plan, as approved by the Registrant's stockholders
at the Registrant's annual meeting of stockholders held on April 30, 2025.
The additional shares of Common Stock issuable
pursuant to the Plan are securities of the same class as other securities for which a Registration Statement on Form S-8 was filed with
the Commission on June 1, 2023 (File No.
333-272346
) (the "Prior Registration Statement"). Accordingly, the contents of the
Prior Registration Statement are incorporated by reference into this Registration Statement pursuant to General Instruction E of Form
S-8, except to the extent supplemented, amended or superseded by the information set forth below.
PART II
INFORMATION REQUIRED IN THE REGISTRATION STATEMENT
Item 3. Incorporation of Documents by Reference.
The following documents, which have previously
been filed by the Registrant with the Commission pursuant to the Securities Exchange Act of 1934, as amended (the "Exchange Act")
are incorporated herein by reference:
·
the Registrant's
Annual Report on Form 10-K for the fiscal year ended December 31, 2024
, filed with the Commission on February
27, 2025 (including the information incorporated by reference therein from the
Registrant's Definitive Proxy Statement on Schedule 14A
, filed with the Commission on March 17, 2025);
·
the Registrant's
Quarterly
    Report on Form 10-Q for the quarter ended March 31, 2025
, filed with the Commission on May 8, 2025;
·
the
                                            Registrant's Current Reports on Form 8-K filed with the Commission on
February
                                            12, 2025
,
March
                                            6, 2025
,
March
                                            7, 2025
,
May
                                            1, 2025
and
May
                                            8, 2025
(excluding any information furnished in such reports under Item 2.02, Item 7.01
                                            or Item 9.01); and
·
the description of the Registrant's common stock set forth in
Exhibit 4.3
of the Registrant's
Annual Report on Form 10-K for the year ended December 31, 2019, together with any amendment or report filed with the Commission for the
purpose of updating such description.
All documents filed by the Registrant with the
Commission pursuant to Sections 13(a), 13(c), 14 and 15(d) of the Exchange Act (other than those furnished pursuant to Item 2.02 or Item
7.01 of Form 8-K or other information "furnished" to the Commission) subsequent to the filing of this Registration Statement
and prior to the filing of a post-effective amendment that indicates that all securities offered have been sold or that deregisters all
securities then remaining unsold will be deemed to be incorporated by reference in this Registration Statement and to be part hereof from
the date of filing of such documents. Any statement contained in any document incorporated or deemed to be incorporated by reference herein
will be deemed to be modified or superseded for purposes of this Registration Statement to the extent that a statement contained herein
or in any other subsequently filed document that also is or is deemed to be incorporated by reference herein modifies or supersedes such
statement. Any such statement so modified or superseded will not be deemed, except as modified or superseded, to constitute a part of
this Registration Statement.
Item 8. Exhibits.
Exhibit No.
Description
4.1
Restated Certificate of Incorporation of the Registrant (incorporated herein by reference to Exhibit 3.2 to the Registrant's Current Report on Form 8-K filed on June 19, 2014).
4.2
Certificate of Amendment to the Restated Certificate of Incorporation (incorporated herein by reference to Exhibit 3.1 to the Registrant's Current Report on Form 8-K filed on June 1, 2023).
4.3
Amended and Restated Bylaws (effective November 8, 2023) (incorporated herein by reference to Exhibit 3.2 to the Registrant's Annual Report on Form 10-K filed on March 7, 2024).
5.1
Opinion of Thompson Hine LLP.
23.1
Consent of Independent Registered Public Accounting Firm.
23.2
Consent of Thompson Hine LLP (included in Exhibit 5.1).
24.1
Power of Attorney (included on the signature page to this Registration Statement).
99.1
Aspen Aerogels Amended and Restated 2023 Equity Incentive Plan (incorporated herein by reference to Exhibit 10.1 to the Registrant's Current Report on Form 8-K filed with the SEC on May 1, 2025).
99.2
Form of Stock Option Agreement under Aspen Aerogels 2023 Equity Incentive Plan (incorporated herein by reference to Exhibit 10.2 to the Registrant's Current Report on Form 8-K filed with the SEC on June 1, 2023).
99.3
Form of Restricted Stock Unit Agreement for Executive Officers under Aspen Aerogels 2023 Equity Incentive Plan (incorporated herein by reference to Exhibit 10.3 to the Registrant's Current Report on Form 8-K filed with the SEC on June 1, 2023).
99.4
Form of Restricted Stock Agreement for Directors under Aspen Aerogels 2023 Equity Incentive Plan (incorporated herein by reference to Exhibit 10.4 to the Registrant's Current Report on Form 8-K filed with the SEC on June 1, 2023).
99.5
Form of Director Stock Option Agreement under Aspen Aerogels 2023 Equity Incentive Plan (incorporated herein by reference to Exhibit 10.5 to the Registrant's Current Report on Form 8-K filed with the SEC on June 1, 2023).
107
Filing Fee Table.
SIGNATURES
Pursuant to the requirements of the Securities
Act of 1933, the Registrant 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 Northborough,
state of Massachusetts on May 8, 2025.
ASPEN AEROGELS, INC.
By
/s/ Donald R. Young
Donald R. Young
President and Chief Executive Officer
Each person whose signature appears below constitutes
and appoints Donald R. Young, Ricardo C. Rodriguez and Virginia H. Johnson, and each of them singly, his or her true and lawful attorneys-in-fact and
agents, with full power of substitution and resubstitution in each of them singly, for him or her and in his or her name, place and stead,
and in any and all capacities, to sign any and all amendments (including post-effective amendments) to this Registration Statement on
Form S-8 of Aspen Aerogels, Inc., and to file the same, with all exhibits thereto and other documents in connection therewith,
with the Securities and Exchange Commission, granting to the attorneys-in-fact and agents, and each of them, full power and
authority to do and perform each and every act and thing requisite or necessary to be done in or about the premises, as full to all intents
and purposes as he might or could do in person, hereby ratifying and confirming all that the attorneys-in-fact and agents or
any of each of them or their substitute may lawfully do or cause to be done by virtue hereof.
Pursuant to the requirements of the Securities
Act of 1933, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated.
Signature
Title
Date
/s/ Donald R. Young
President, Chief Executive Officer and Director
May 8, 2025
Donald R. Young
(Principal Executive Officer)
/s/ Ricardo C. Rodriguez
Chief Financial Officer and Treasurer
May 8, 2025
Ricardo C. Rodriguez
(Principal Financial Officer)
/s/ Santhosh P. Daniel
Chief Accounting Officer
May 8, 2025
Santhosh P. Daniel
(Principal Accounting Officer)
/s/ William P. Noglows
Chairperson of the Board
May 8, 2025
William P. Noglows
/s/ Steven R. Mitchell
Director
May 8, 2025
Steven R. Mitchell
/s/ James E. Sweetnam
Director
May 8, 2025
James E. Sweetnam
/s/ Kathleen M. Kool
Director
May 8, 2025
Kathleen M. Kool
/s/ Cari Robinson
Director
May 8, 2025
Cari Robinson