<SEC-DOCUMENT>0001104659-20-019178.txt : 20200212
<SEC-HEADER>0001104659-20-019178.hdr.sgml : 20200212
<ACCEPTANCE-DATETIME>20200212155318
ACCESSION NUMBER:		0001104659-20-019178
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20200212
DATE AS OF CHANGE:		20200212
GROUP MEMBERS:		DANIEL MACK
GROUP MEMBERS:		WILMOT B. HARKEY

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			CATALYST BIOSCIENCES, INC.
		CENTRAL INDEX KEY:			0001124105
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				562020050
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-82442
		FILM NUMBER:		20603897

	BUSINESS ADDRESS:	
		STREET 1:		611 GATEWAY BLVD., SUITE 710
		CITY:			SOUTH SAN FRANCISCO
		STATE:			CA
		ZIP:			94080
		BUSINESS PHONE:		650-871-0761

	MAIL ADDRESS:	
		STREET 1:		611 GATEWAY BLVD., SUITE 710
		CITY:			SOUTH SAN FRANCISCO
		STATE:			CA
		ZIP:			94080

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	TARGACEPT INC
		DATE OF NAME CHANGE:	20000919

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Nantahala Capital Management, LLC
		CENTRAL INDEX KEY:			0001472322
		IRS NUMBER:				201151760
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		130 MAIN ST.
		STREET 2:		2ND FLOOR
		CITY:			NEW CANAAN
		STATE:			CT
		ZIP:			06840
		BUSINESS PHONE:		203-404-1172

	MAIL ADDRESS:	
		STREET 1:		130 MAIN ST.
		STREET 2:		2ND FLOOR
		CITY:			NEW CANAAN
		STATE:			CT
		ZIP:			06840
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>tm207751-5_sc13ga.htm
<DESCRIPTION>SC 13G/A
<TEXT>
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<P STYLE="margin: 0"></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: 0">&nbsp;</P>

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

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

<P STYLE="font: 10pt 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"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>SCHEDULE 13G</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>Under the Securities Exchange Act of
1934</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><B>(Amendment No. 1)*</B></P>

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

<P STYLE="font: 14pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"><U>Catalyst Biosciences, Inc.</U></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Name of Issuer)</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"><U>Common Stock, $0.001 par value </U></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Title of Class of Securities)</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"><U>14888D208 </U></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(CUSIP Number)</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"><U>December 31, 2019</U></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">(Date of Event Which Requires Filing of
this 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">Check the appropriate box to designate the rule pursuant to
which this Schedule is filed:</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">&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: 46%; padding-right: 5.4pt; padding-left: 5.4pt; text-align: right"><FONT STYLE="font: 10pt Wingdings">&#120;</FONT></TD>
    <TD STYLE="width: 54%; padding-right: 5.4pt; padding-left: 5.4pt"><FONT STYLE="font-size: 10pt">&nbsp;Rule 13d-1(b)</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: right"><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt"><FONT STYLE="font-size: 10pt">&nbsp;Rule 13d-1(c)</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; text-align: right"><FONT STYLE="font-family: Wingdings">&#168;</FONT></TD>
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt"><FONT STYLE="font-size: 10pt">&nbsp;Rule 13d-1(d)</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; text-align: justify">*The remainder of this cover page shall
be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any
subsequent amendment containing information which would alter the disclosures provided in a prior cover page.</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 information required on the remainder
of this cover page shall not be deemed to be &quot;filed&quot; for the purpose of Section 18 of the Securities Exchange Act of
1934 (&quot;Act&quot;) or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions
of the Act (however, see the Notes).</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">Continued on following pages</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center">Page 1 of 7 Pages</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>

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

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

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    <DIV STYLE="margin-top: 12pt; margin-bottom: 6pt; border-bottom: Black 1pt solid"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
    <DIV STYLE="page-break-before: always; 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: center">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: center"></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: 50%; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>CUSIP NO. &nbsp;14888D208</B></FONT></TD>
    <TD STYLE="width: 50%; font-size: 10pt; font-weight: bold; text-align: right"><FONT STYLE="font-size: 10pt"><B>Page </B></FONT><B>
    2 <FONT STYLE="font-size: 10pt">of 7 Pages</FONT></B></TD></TR>
</TABLE>
<P STYLE="font: bold 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"></P>




<TABLE CELLSPACING="1" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR>
    <TD COLSPAN="2" STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">CUSIP
    No.&nbsp;&nbsp;14888D208</FONT></TD></TR>
<TR>
    <TD STYLE="width: 75%; padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(1)
    Names of reporting persons</FONT></TD>
    <TD STYLE="width: 25%; padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">Nantahala
    Capital Management, LLC</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(2) Check the
    appropriate box if a member of a group</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(a)</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt; text-align: center"><FONT STYLE="font-size: 10pt">(see
    instructions)</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(b)</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(3) SEC use only</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt">&nbsp;</TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(4) Citizenship
    or place of organization</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">MA</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">Number of shares
    beneficially owned by each reporting person with:</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt">&nbsp;</TD></TR>
<TR>
    <TD STYLE="padding: 0.75pt 0.75pt 0.75pt 0.375in"><FONT STYLE="font-size: 10pt">(5) Sole voting power</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">0</FONT></TD></TR>
<TR>
    <TD STYLE="padding: 0.75pt 0.75pt 0.75pt 0.375in"><FONT STYLE="font-size: 10pt">(6) Shared voting power</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">1,071,749</FONT></TD></TR>
<TR>
    <TD STYLE="padding: 0.75pt 0.75pt 0.75pt 0.375in"><FONT STYLE="font-size: 10pt">(7) Sole dispositive power</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">0</FONT></TD></TR>
<TR>
    <TD STYLE="padding: 0.75pt 0.75pt 0.75pt 0.375in"><FONT STYLE="font-size: 10pt">(8) Shared dispositive power</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">1,071,749</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(9) Aggregate
    amount beneficially owned by each reporting person</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">1,071,749</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(10) Check if
    the aggregate amount in Row (9) excludes certain shares (see instructions)</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt">&nbsp;</TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(11) Percent
    of class represented by amount in Row (9)</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">8.9%</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(12) Type of
    reporting person (see instructions)</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">IA</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -1in"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -1in"></P>

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    <DIV STYLE="page-break-before: always; margin-top: 6pt; margin-bottom: 12pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -1in"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -1in"></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: 50%; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>CUSIP NO. &nbsp;14888D208</B></FONT></TD>
    <TD STYLE="width: 50%; font-size: 10pt; font-weight: bold; text-align: right"><FONT STYLE="font-size: 10pt"><B>Page 3 of 7
    Pages</B></FONT></TD></TR>
</TABLE>
<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<TABLE CELLSPACING="1" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR>
    <TD COLSPAN="2" STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">CUSIP
    No.&nbsp;&nbsp;14888D208</FONT></TD></TR>
<TR>
    <TD STYLE="width: 75%; padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(1)
    Names of reporting persons</FONT></TD>
    <TD STYLE="width: 25%; padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">Wilmot
    B. Harkey</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(2) Check the
    appropriate box if a member of a group</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(a)</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt; text-align: center"><FONT STYLE="font-size: 10pt">(see
    instructions)</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(b)</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(3) SEC use only</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt">&nbsp;</TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(4) Citizenship
    or place of organization</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">USA</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">Number of shares
    beneficially owned by each reporting person with:</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt">&nbsp;</TD></TR>
<TR>
    <TD STYLE="padding: 0.75pt 0.75pt 0.75pt 0.375in"><FONT STYLE="font-size: 10pt">(5) Sole voting power</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">0</FONT></TD></TR>
<TR>
    <TD STYLE="padding: 0.75pt 0.75pt 0.75pt 0.375in"><FONT STYLE="font-size: 10pt">(6) Shared voting power</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">1,071,749</FONT></TD></TR>
<TR>
    <TD STYLE="padding: 0.75pt 0.75pt 0.75pt 0.375in"><FONT STYLE="font-size: 10pt">(7) Sole dispositive power</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">0</FONT></TD></TR>
<TR>
    <TD STYLE="padding: 0.75pt 0.75pt 0.75pt 0.375in"><FONT STYLE="font-size: 10pt">(8) Shared dispositive power</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">1,071,749</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(9) Aggregate
    amount beneficially owned by each reporting person</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">1,071,749</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(10) Check if
    the aggregate amount in Row (9) excludes certain shares (see instructions)</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt">&nbsp;</TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(11) Percent
    of class represented by amount in Row (9)</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">8.9%</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(12) Type of
    reporting person (see instructions)</FONT></TD>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">HC</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -1in"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -1in"></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -1in"><B>&nbsp;</B></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -1in"></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: 50%; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>CUSIP NO. &nbsp;14888D208</B></FONT></TD>
    <TD STYLE="width: 50%; font-size: 10pt; font-weight: bold; text-align: right"><FONT STYLE="font-size: 10pt"><B>Page 4 of 7
    Pages</B></FONT></TD></TR>
</TABLE>
<P STYLE="font: bold 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P>

<TABLE CELLSPACING="1" CELLPADDING="0" STYLE="font: 10pt Times New Roman, Times, Serif; width: 100%">
<TR>
    <TD COLSPAN="2" STYLE="padding: 0.75pt"><FONT STYLE="font-size: 10pt">CUSIP No.&nbsp;&nbsp;14888D208</FONT></TD></TR>
<TR>
    <TD STYLE="width: 75%; padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(1)
    Names of reporting persons</FONT></TD>
    <TD STYLE="width: 25%; padding: 0.75pt"><FONT STYLE="font-size: 10pt">Daniel Mack</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(2) Check the
    appropriate box if a member of a group</FONT></TD>
    <TD STYLE="padding: 0.75pt"><FONT STYLE="font-size: 10pt">(a)</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt; text-align: center"><FONT STYLE="font-size: 10pt">(see
    instructions)</FONT></TD>
    <TD STYLE="padding: 0.75pt"><FONT STYLE="font-size: 10pt">(b)</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(3) SEC use only</FONT></TD>
    <TD STYLE="padding: 0.75pt">&nbsp;</TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(4) Citizenship
    or place of organization</FONT></TD>
    <TD STYLE="padding: 0.75pt"><FONT STYLE="font-size: 10pt">USA</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">Number of shares
    beneficially owned by each reporting person with:</FONT></TD>
    <TD STYLE="padding: 0.75pt">&nbsp;</TD></TR>
<TR>
    <TD STYLE="padding: 0.75pt 0.75pt 0.75pt 24pt"><FONT STYLE="font-size: 10pt">(5) Sole voting power</FONT></TD>
    <TD STYLE="padding: 0.75pt"><FONT STYLE="font-size: 10pt">0</FONT></TD></TR>
<TR>
    <TD STYLE="padding: 0.75pt 0.75pt 0.75pt 24pt"><FONT STYLE="font-size: 10pt">(6) Shared voting power</FONT></TD>
    <TD STYLE="padding: 0.75pt"><FONT STYLE="font-size: 10pt">1,071,749</FONT></TD></TR>
<TR>
    <TD STYLE="padding: 0.75pt 0.75pt 0.75pt 24pt"><FONT STYLE="font-size: 10pt">(7) Sole dispositive power</FONT></TD>
    <TD STYLE="padding: 0.75pt"><FONT STYLE="font-size: 10pt">0</FONT></TD></TR>
<TR>
    <TD STYLE="padding: 0.75pt 0.75pt 0.75pt 24pt"><FONT STYLE="font-size: 10pt">(8) Shared dispositive power</FONT></TD>
    <TD STYLE="padding: 0.75pt"><FONT STYLE="font-size: 10pt">1,071,749</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(9) Aggregate
    amount beneficially owned by each reporting person</FONT></TD>
    <TD STYLE="padding: 0.75pt"><FONT STYLE="font-size: 10pt">1,071,749</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(10) Check if
    the aggregate amount in Row (9) excludes certain shares (see instructions)</FONT></TD>
    <TD STYLE="padding: 0.75pt">&nbsp;</TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(11) Percent
    of class represented by amount in Row (9)</FONT></TD>
    <TD STYLE="padding: 0.75pt"><FONT STYLE="font-size: 10pt">8.9%</FONT></TD></TR>
<TR>
    <TD STYLE="padding-top: 0.75pt; padding-right: 0.75pt; padding-bottom: 0.75pt"><FONT STYLE="font-size: 10pt">(12) Type of
    reporting person (see instructions)</FONT></TD>
    <TD STYLE="padding: 0.75pt"><FONT STYLE="font-size: 10pt">HC</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0 0pt 1in; text-indent: -1in"><B>&nbsp;</B></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: 1in"><FONT STYLE="font-size: 10pt"><B>Item 1(a).</B></FONT></TD>
    <TD><FONT STYLE="font-size: 10pt"><B>Name of Issuer: </B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><P STYLE="margin: 0pt 0; font: 10pt Times New Roman, Times, Serif">Catalyst Biosciences, Inc. (the &ldquo;Issuer&rdquo;).</P>


</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-size: 10pt"><B>Item 1(b).</B></FONT></TD>
    <TD><FONT STYLE="font-size: 10pt"><B>Address of the Issuer's Principal Executive Offices:</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><P STYLE="margin: 0pt 0; font: 10pt Times New Roman, Times, Serif">611 Gateway Blvd. Suite 710, South San Francisco, California
94080</P>


</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-size: 10pt"><B>Item 2(a).</B></FONT></TD>
    <TD><FONT STYLE="font-size: 10pt"><B>Name of Person Filing</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Nantahala Capital Management, LLC (&ldquo;Nantahala&rdquo;)</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Wilmot B. Harkey</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Daniel Mack (together the &ldquo;Reporting Persons&rdquo;)</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-size: 10pt"><B>Item 2(b).</B></FONT></TD>
    <TD><FONT STYLE="font-size: 10pt"><B>Address of Principal Business Office or, if None, Residence:</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">130 Main St 2<SUP>nd</SUP> Floor</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">New Canaan, CT 06840</P></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-indent: 1in">&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: 1in"><FONT STYLE="font-size: 10pt"><B>Item 2(c).</B></FONT></TD>
    <TD><FONT STYLE="font-size: 10pt"><B>Citizenship:</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Nantahala is a Massachusetts limited liability company.</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Each of Messrs. Harkey and Mack is a citizen of the
        United States of America.</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-size: 10pt"><B>Item 2(d).</B></FONT></TD>
    <TD><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Title of Class of Securities:</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P>

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

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Common Stock, $0.001 par value (the &ldquo;Shares&rdquo;).</P>



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



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



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



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



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

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

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

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

<P STYLE="margin-top: 0; margin-bottom: 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: 50%; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>CUSIP NO. &nbsp;14888D208</B></FONT></TD>
    <TD STYLE="width: 50%; font-size: 10pt; font-weight: bold; text-align: right"><FONT STYLE="font-size: 10pt"><B>Page 5 of 7
    Pages</B></FONT></TD></TR>
</TABLE>
<P STYLE="font: bold 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: 1in"><FONT STYLE="font-size: 10pt"><B>Item 2(e).</B></FONT></TD>
    <TD><FONT STYLE="font-size: 10pt"><B>CUSIP Number:</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><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">14888D208</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><BR STYLE="clear: both">
    </FONT><FONT STYLE="font-size: 10pt"><B>Item 3.</B></FONT></TD>
    <TD><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>If this statement is filed pursuant to Rule 13d-1(b),
        or 13d-2(b) or (c), check whether the person filing is a:</B></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">(a) <FONT STYLE="font-family: Wingdings">&#168;</FONT>
        Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o).</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) <FONT STYLE="font-family: Wingdings">&#168;</FONT>
        Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).</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">(c) <FONT STYLE="font-family: Wingdings">&#168;</FONT>
        Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).</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">(d) <FONT STYLE="font-family: Wingdings">&#168;</FONT>
        Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C 80a-8).</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">(e) <FONT STYLE="font-family: Wingdings">&#120;</FONT>
        An investment adviser in accordance with &sect;240.13d-1(b)(1)(ii)(E).</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">(f) <FONT STYLE="font-family: Wingdings">&#168;</FONT>
        An employee benefit plan or endowment fund in accordance with &sect;240.13d-1(b)(1)(ii)(F).</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">(g) <FONT STYLE="font-family: Wingdings">&#120;</FONT>
        A parent holding company or control person in accordance with &sect; 240.13d-1(b)(1)(ii)(G).</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">(h) <FONT STYLE="font-family: Wingdings">&#168;</FONT>
        A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813).</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">(i) <FONT STYLE="font-family: Wingdings">&#168;</FONT>
        A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">Investment Company Act of 1940 (15 U.S.C. 80a-3).</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">(j) <FONT STYLE="font-family: Wingdings">&#168;</FONT>&nbsp;Group,
        in accordance with &sect;240.13d-1(b)(1)(ii)(J).</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD><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 4.</B></P></TD>
    <TD><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>Ownership:</B></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="white-space: nowrap"><FONT STYLE="font-size: 10pt"><B>Item 4(a).</B></FONT></TD>
    <TD><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>Amount Beneficially Owned: </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"></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">As of December 31, 2019, Nantahala may
be deemed to be the beneficial owner of 1,071,749 Shares held by funds and separately managed accounts under its control, and as
the managing members of Nantahala, each of Messrs. Harkey and Mack may be deemed to be a beneficial owner of those Shares.</P>



<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-size: 10pt"><B>Item 4(b).</B></FONT></TD>
    <TD><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify"><B>Percent of Class: </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"></P>

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

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

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

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">As of December 31, 2019, each of the Reporting
Persons may be deemed to be the beneficial owner of 8.9% of the total number of Shares outstanding (based upon information provided
by the Issuer on Form 10-Q filed November 7, 2019, there were 12,040,835 Shares outstanding as of October 25, 2019).</P>



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



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



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



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



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

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

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

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

<P STYLE="margin: 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 STYLE="width: 50%; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>CUSIP NO. &nbsp;14888D208</B></FONT></TD>
    <TD STYLE="width: 50%; font-size: 10pt; font-weight: bold; text-align: right"><FONT STYLE="font-size: 10pt"><B>Page 6 of 7
    Pages</B></FONT></TD></TR>
</TABLE>
<P STYLE="font: bold 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: 1in"><FONT STYLE="font-size: 10pt"><B>Item 4(c).</B></FONT></TD>
    <TD><FONT STYLE="font-size: 10pt"><B>Number of shares as to which such person has:</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="width: 100%; font: 10pt Times New Roman, Times, Serif; border-collapse: collapse">
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD COLSPAN="3"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><U>Nantahala Capital Management, LLC</U></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 1in">&nbsp;</TD>
    <TD STYLE="width: 0.5in"><FONT STYLE="font-size: 10pt">(i)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">Sole power to vote or direct the vote</FONT></TD>
    <TD STYLE="width: 1in; text-align: right"><FONT STYLE="font-size: 10pt">0</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">(ii)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">Shared power to vote or to direct the vote</FONT></TD>
    <TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">1,071,749</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">(iii)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">Sole power to dispose or to direct the disposition of</FONT></TD>
    <TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">0</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"></P></TD>
    <TD><FONT STYLE="font-size: 10pt">(iv)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">Shared power to dispose or to direct the disposition of</FONT></TD>
    <TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">1,071,749</FONT></TD></TR>
</TABLE>
<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><FONT STYLE="font-size: 10pt">&nbsp;</FONT></TD>
    <TD COLSPAN="3"><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><U>Each of Messrs. Harkey and Mack:</U></P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 1in">&nbsp;</TD>
    <TD STYLE="width: 0.5in"><FONT STYLE="font-size: 10pt">(i)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">Sole power to vote or direct the vote</FONT></TD>
    <TD STYLE="width: 1in; text-align: right"><FONT STYLE="font-size: 10pt">0</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">(ii)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">Shared power to vote or to direct the vote</FONT></TD>
    <TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">1,071,749</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">(iii)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">Sole power to dispose or to direct the disposition of</FONT></TD>
    <TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">0</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">(iv)</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">Shared power to dispose or to direct the disposition of</FONT></TD>
    <TD STYLE="text-align: right"><FONT STYLE="font-size: 10pt">1,071,749</FONT></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

<P STYLE="margin: 0"></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: 1in"><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Item 5.</B></FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Ownership of Five Percent or Less of a Class:</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">This Item 5 is not applicable.</P>
        <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0"><B>&nbsp;</B></P></TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Item 6.</B></FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Ownership of More than Five Percent on Behalf
    of Another Person:</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: justify">&nbsp;</TD>
    <TD><P STYLE="margin: 0pt 0; font: 10pt Times New Roman, Times, Serif">This Item 6 is not applicable.</P>


</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Item 7.</B></FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Identification and Classification of the
    Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company:</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Each of Messrs. Harkey and Mack is filing this
    Schedule 13G as a control person in respect of shares beneficially owned by Nantahala, an investment adviser as described
    in &sect;240.13d-1(b)(1)(ii)(E).&nbsp;&nbsp;See Item 4(a).</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Item 8.</B></FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Identification and Classification of Members
    of the Group:</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">This Item 8 is not applicable.</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Item 9.</B></FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Notice of Dissolution of Group:</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">This Item 9 is not applicable.</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Item 10.</B></FONT></TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif"><B>Certification:</B></FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="text-align: justify">&nbsp;</TD>
    <TD><P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify">By signing below each Reporting
        Person certifies that, to the best of such person's knowledge and belief, the securities referred to above were acquired
        and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the
        effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in
        connection with or as a participant in any transaction having such purpose or effect.</P></TD></TR>
</TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0">&nbsp;</P>

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    <TD STYLE="width: 50%; font-size: 10pt"><FONT STYLE="font-size: 10pt"><B>CUSIP NO. &nbsp;14888D208</B></FONT></TD>
    <TD STYLE="width: 50%; padding-left: 5.4pt; font-size: 10pt; font-weight: bold; text-align: right"><FONT STYLE="font-size: 10pt"><B>Page
    </B></FONT><B> 7 <FONT STYLE="font-size: 10pt">of 7 Pages</FONT></B></TD></TR>
</TABLE>
<P STYLE="font: bold 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>SIGNATURES</B></P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0pt 0; text-align: justify; text-indent: 0.5in">After reasonable inquiry
and to the best of my knowledge and belief, the undersigned certifies that the information set forth in this statement is true,
complete, and correct.</P>

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    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Date:&nbsp;&nbsp;February 12, 2020</FONT></TD>
    <TD COLSPAN="2"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">NANTAHALA CAPITAL MANAGEMENT, LLC</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD STYLE="width: 50%">&nbsp;</TD>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="width: 45%">&nbsp;</TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">By:</FONT></TD>
    <TD STYLE="border-bottom: Black 1pt solid"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">/s/ Paul
    E. Rehm</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Paul E. Rehm</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Chief Compliance Officer</FONT></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 COLSPAN="2" STYLE="border-bottom: Black 1pt solid"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">/s/ Wilmot B. Harkey</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD COLSPAN="2"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Wilmot B. Harkey</FONT></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 COLSPAN="2" STYLE="border-bottom: Black 1pt solid"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">/s/ Daniel Mack</FONT></TD></TR>
<TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD COLSPAN="2"><FONT STYLE="font: 10pt Times New Roman, Times, Serif">Daniel Mack</FONT></TD></TR>
</TABLE>
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