<SEC-DOCUMENT>0001104659-21-054467.txt : 20210423
<SEC-HEADER>0001104659-21-054467.hdr.sgml : 20210423
<ACCEPTANCE-DATETIME>20210423161542
ACCESSION NUMBER:		0001104659-21-054467
CONFORMED SUBMISSION TYPE:	8-K
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20210420
ITEM INFORMATION:		Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers
FILED AS OF DATE:		20210423
DATE AS OF CHANGE:		20210423

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ClearSign Technologies Corp
		CENTRAL INDEX KEY:			0001434524
		STANDARD INDUSTRIAL CLASSIFICATION:	INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL [3823]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			WA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		8-K
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-35521
		FILM NUMBER:		21849874

	BUSINESS ADDRESS:	
		STREET 1:		12870 INTERURBAN AVENUE SOUTH
		CITY:			SEATTLE
		STATE:			WA
		ZIP:			98168
		BUSINESS PHONE:		(206) 673-4848

	MAIL ADDRESS:	
		STREET 1:		12870 INTERURBAN AVENUE SOUTH
		CITY:			SEATTLE
		STATE:			WA
		ZIP:			98168

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	CLEARSIGN COMBUSTION CORP
		DATE OF NAME CHANGE:	20080507
</SEC-HEADER>
<DOCUMENT>
<TYPE>8-K
<SEQUENCE>1
<FILENAME>tm2113920d1_8k.htm
<DESCRIPTION>FORM 8-K
<TEXT>
<HTML>
<HEAD>
     <TITLE></TITLE>
</HEAD>
<BODY STYLE="font: 10pt Times New Roman, Times, Serif">

<P STYLE="margin: 0pt"></P>

<!-- Field: Rule-Page --><DIV STYLE="margin-top: 12pt; margin-bottom: 3pt; width: 100%"><DIV STYLE="font-size: 1pt; border-top: Black 2pt solid; border-bottom: Black 1pt solid">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

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

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

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

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

<!-- Field: Rule-Page --><DIV STYLE="margin: 3pt auto; width: 25%"><DIV STYLE="font-size: 1pt; border-top: Black 1pt solid">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

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

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>Pursuant to Section 13 or 15(d) of the </B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Securities Exchange Act of 1934 </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-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Date of report (Date of earliest event reported):
April 20, 2021</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"></P>

<!-- Field: Rule-Page --><DIV STYLE="margin: 3pt auto; width: 25%"><DIV STYLE="font-size: 1pt; border-top: Black 1pt solid">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

<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>CLEARSIGN TECHNOLOGIES CORPORATION</B></P>

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

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
  <TR>
    <TD STYLE="vertical-align: top; width: 33%; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>Washington</B></FONT></TD>
    <TD STYLE="vertical-align: bottom; width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 32%; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>001-35521</B></FONT></TD>
    <TD STYLE="vertical-align: bottom; width: 1%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 33%; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>26-2056298</B></FONT></TD></TR>
  <TR>
    <TD STYLE="vertical-align: top">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(State or other jurisdiction of</B></P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>incorporation or organization)</B></P></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>(Commission File No.)</B></FONT></TD>
    <TD STYLE="vertical-align: bottom">&nbsp;</TD>
    <TD STYLE="vertical-align: top; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>(IRS Employee Identification<BR>
 No.)</B></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-top: 0pt; margin-bottom: 0pt; text-align: center"><B>12870 Interurban Avenue South</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>Seattle, Washington 98168</B></P>

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>206-673-4848</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin-top: 0pt; margin-bottom: 0pt; text-align: center"><B>(Issuer Telephone number) </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">Check the appropriate box below if the Form 8-K filing is intended
to simultaneously satisfy the filing obligation of the Registrant under any of the following provisions (see General Instruction A.2 below).</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%">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 24px; font-size: 10pt"><FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;</TD>
    <TD STYLE="font-size: 10pt; text-align: justify"><FONT STYLE="font-size: 10pt">Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)</FONT></TD></TR>
  </TABLE>
<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%">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 24px; font-size: 10pt"><FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;</TD>
    <TD STYLE="font-size: 10pt; text-align: justify"><FONT STYLE="font-size: 10pt">Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR240.14a-12)</FONT></TD></TR>
  </TABLE>
<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%">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 24px; font-size: 10pt"><FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;</TD>
    <TD STYLE="font-size: 10pt; text-align: justify"><FONT STYLE="font-size: 10pt">Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)).</FONT></TD></TR>
  </TABLE>
<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%">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 24px; font-size: 10pt"><FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;</TD>
    <TD STYLE="font-size: 10pt; text-align: justify"><FONT STYLE="font-size: 10pt">Pre-commencement communications pursuant to Rule 13e-(c) under the Exchange Act (17 CFR 240.13(e)-4(c))</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">Securities registered pursuant to Section 12(b) of the 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: top">
    <TD STYLE="width: 33%; border-bottom: black 1pt solid; padding: 0.25pt 0.25pt 0.5pt; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>Title of each class</B></FONT></TD>
    <TD STYLE="width: 1%; padding: 0.25pt 0.25pt 1.25pt">&nbsp;</TD>
    <TD STYLE="width: 32%; border-bottom: black 1pt solid; padding: 0.25pt 0.25pt 0.5pt; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>Trading Symbol(s)</B></FONT></TD>
    <TD STYLE="width: 1%; padding: 0.25pt 0.25pt 1.25pt">&nbsp;</TD>
    <TD STYLE="width: 33%; border-bottom: black 1pt solid; padding: 0.25pt 0.25pt 0.5pt; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>Name of each exchange on which<BR>
 registered</B></FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0.25pt">&nbsp;</TD>
    <TD STYLE="padding: 0.25pt">&nbsp;</TD>
    <TD STYLE="padding: 0.25pt">&nbsp;</TD>
    <TD STYLE="padding: 0.25pt">&nbsp;</TD>
    <TD STYLE="padding: 0.25pt">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding: 0.25pt; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>Common Stock</B></FONT></TD>
    <TD STYLE="padding: 0.25pt">&nbsp;</TD>
    <TD STYLE="padding: 0.25pt; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>CLIR</B></FONT></TD>
    <TD STYLE="padding: 0.25pt">&nbsp;</TD>
    <TD STYLE="padding: 0.25pt; font-size: 10pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>The Nasdaq Stock Market LLC</B></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">Indicate by check mark whether the registrant is an emerging growth
company as defined in Rule 405 of the Securities Act of 1933 (&sect;230.405 of this chapter) or Rule 12b-2 of the Securities Exchange
Act of 1934 (&sect;240.12b-2 of this chapter).</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%">
  <TR STYLE="vertical-align: top">
    <TD STYLE="text-align: right; width: 85%; font-size: 10pt"><FONT STYLE="font-size: 10pt">Emerging growth company <FONT STYLE="font-family: Wingdings">&#168;</FONT></FONT></TD>
    <TD STYLE="width: 15%; font-size: 10pt">&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">If an emerging growth company, indicate by check mark if the registrant
has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant
to Section 13(a) of the Exchange Act. <FONT STYLE="font-family: Wingdings"><FONT STYLE="font-family: Wingdings">&#168;</FONT></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>

<!-- Field: Rule-Page --><DIV STYLE="margin-top: 3pt; margin-bottom: 12pt; width: 100%"><DIV STYLE="font-size: 1pt; border-top: Black 1pt solid; border-bottom: Black 2pt solid">&nbsp;</DIV></DIV><!-- Field: /Rule-Page -->

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

<!-- Field: Page; Sequence: 1 -->
    <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%">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 96px; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>Item 5.02.</B></FONT></TD>
    <TD STYLE="text-align: justify; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers</B></FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">On April 20, 2021, Brian G.
Fike announced his intent to resign from his position as Chief Financial Officer, Treasurer, and Secretary of ClearSign Technologies Corporation
(the &#8220;Company&#8221;), effective December 3, 2021 (the &#8220;Resignation Date&#8221;). The Company plans to transfer the Chief
Financial Officer, Treasurer, and Secretary positions full-time from the Company&#8217;s Seattle office to the Company&#8217;s Tulsa office
this year and Mr. Fike is unable to relocate because of family circumstances. Mr. Fike articulated his commitment to support the Company
through the search, onboarding, and transition of its next Chief Financial Officer, Treasurer, and Secretary.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">In order to provide for an
orderly transition of Mr. Fike&#8217;s responsibilities and relationships, the Company and Mr. Fike entered into a letter agreement (the
 &#8220;Letter Agreement&#8221;) on April 20, 2021, pursuant to which Mr. Fike agreed to serve as a Chief Financial Officer, Treasurer,
and Secretary of the Company until the Resignation Date. Under the terms of the Letter Agreement, Mr. Fike will be paid his current compensation
and benefits and perform such functions as reasonably requested by the Company during this period including responding to inquiries, providing
historical information, or advising on business matters that are within the scope of his current responsibilities. Additionally, Mr. Fike
agreed to the documentation of the information related to his duties and responsibilities (the &#8220;Transition Services&#8221;) to aid
the transition and onboarding of the next Chief Financial Officer, Treasurer, and Secretary of the Company. In consideration, if Mr. Fike
remains employed by the Company through the Resignation Date, or some other date as may be mutually agreed to, the Company will provide
Mr. Fike with a severance payment in an amount equal to approximately six (6) weeks of pay at his current pay rate, subject to standard
payroll deductions and withholdings (the &#8220;Base Severance Payment&#8221;). Upon the successful completion of the Transition Services,
the Company will make an additional payment of $77,000 (the &#8220;Additional Severance Payment&#8221;) to the Base Severance Payment
and will also cause the vesting of up to 15,000 unvested stock options (the &#8220;Option Acceleration&#8221;). The receipt of the Base
Severance Payment, the Additional Severance Payment, and the Option Acceleration (collectively, the &#8220;Severance Benefits&#8221;)
are each contingent upon Mr. Fike&#8217;s execution of a separation agreement that will include a waiver and release of claims in addition
to other customary provisions. In the event, Mr. Fike&#8217;s employment is terminated for cause prior to the Resignation Date, Mr. Fike
will not be entitled to any of the Severance Benefits. &#8220;For cause&#8221; under the Letter Agreement means, after receiving at least
one warning, Mr. Fike fails to adequately perform all of the responsibilities of his position or he violates a Company policy or law.
In the event, Mr. Fike is terminated without cause or voluntarily resigns prior to the Resignation Date, Mr. Fike will only be entitled
to receive the Base Severance Payment, subject to execution of a separation agreement, unless the Transition Services are fully performed
and Mr. Fike&#8217;s separation date is mutually agreed upon, in which case, Mr. Fike will also receive the Additional Severance and Option
Acceleration.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">The board of directors of
the Company and the Company&#8217;s Chief Executive Officer express their gratitude to Mr. Fike for his service to the Company and wish
him and his family well.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">The foregoing description
of the Letter Agreement does not purport to be a complete description of the rights and obligations of the parties thereunder and is qualified
in its entirety by reference to the Letter Agreement, which will be included as an exhibit to the Company&#8217;s Quarterly Report on
Form 10-Q for the fiscal quarter ended June 30, 2021.</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">The statements in this Current
Report on Form 8-K include forward-looking statements regarding the intent, belief or current expectations of the Company and members
of its management team, as well as the assumptions on which such statements are based, and generally are identified by the use of words
such as &#8220;may,&#8221; &#8220;will,&#8221; &#8220;seeks,&#8221; &#8220;strives,&#8221; &#8220;anticipates,&#8221; &#8220;believes,&#8221;
 &#8220;estimates,&#8221; &#8220;expects,&#8221; &#8220;plans,&#8221; &#8220;intends,&#8221; &#8220;should&#8221; or similar expressions.
Actual results may differ materially from those contemplated by such forward-looking statements, including as a result of those factors
set forth in the Risk Factors section of the Company&#8217;s most recent Annual Report on Form 10-K for the year ended December 31, 2020
filed on March 31, 2021 and all other filings with the Securities and Exchange Commission after that date. Forward-looking statements
speak only as of the date they are made, and the Company undertakes no obligation to update or revise forward-looking statements to reflect
changed assumptions, the occurrence of unanticipated events, or changes to future operating results over time, unless required by law.</P>

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

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

<!-- Field: Page; Sequence: 2 -->
    <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; text-align: justify; text-indent: 0.5in">&nbsp;</P>

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

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




<P STYLE="text-align: justify; font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 0.5in">Pursuant to the requirements of the Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.</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">Dated: April 23, 2021</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%">
  <TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD COLSPAN="2" STYLE="font-size: 10pt"><FONT STYLE="font-size: 10pt">CLEARSIGN TECHNOLOGIES CORPORATION</FONT></TD></TR>
  <TR>
    <TD STYLE="vertical-align: top; width: 50%">&nbsp;</TD>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="vertical-align: top; width: 45%">&nbsp;</TD></TR>
  <TR>
    <TD STYLE="vertical-align: top; padding-bottom: 1pt">&nbsp;</TD>
    <TD STYLE="padding-bottom: 1pt; font-size: 10pt"><FONT STYLE="font-size: 10pt">By: </FONT></TD>
    <TD STYLE="vertical-align: top; border-bottom: black 1pt solid; padding-bottom: 0.5pt; font-size: 10pt"><FONT STYLE="font-size: 10pt">/s/ Colin J. Deller</FONT></TD></TR>
  <TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: top; font-size: 10pt"><FONT STYLE="font-size: 10pt">Colin J. Deller</FONT></TD></TR>
  <TR>
    <TD STYLE="vertical-align: top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD STYLE="vertical-align: top; font-size: 10pt"><FONT STYLE="font-size: 10pt">Chief Executive Officer</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"></P>

<!-- Field: Page; Sequence: 3; Options: Last -->
    <DIV STYLE="margin-top: 12pt; margin-bottom: 6pt; border-bottom: Black 1pt solid"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <!-- Field: /Page -->

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

</BODY>
</HTML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
