<SEC-DOCUMENT>0000947871-23-000180.txt : 20230214
<SEC-HEADER>0000947871-23-000180.hdr.sgml : 20230214
<ACCEPTANCE-DATETIME>20230214164321
ACCESSION NUMBER:		0000947871-23-000180
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		2
FILED AS OF DATE:		20230214
DATE AS OF CHANGE:		20230214
GROUP MEMBERS:		ORBIMED CAPITAL LLC

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			Mersana Therapeutics, Inc.
		CENTRAL INDEX KEY:			0001442836
		STANDARD INDUSTRIAL CLASSIFICATION:	PHARMACEUTICAL PREPARATIONS [2834]
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-90033
		FILM NUMBER:		23630656

	BUSINESS ADDRESS:	
		STREET 1:		840 MEMORIAL DRIVE
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02139
		BUSINESS PHONE:		617-498-0020

	MAIL ADDRESS:	
		STREET 1:		840 MEMORIAL DRIVE
		CITY:			CAMBRIDGE
		STATE:			MA
		ZIP:			02139

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MERSANA THERAPEUTICS INC
		DATE OF NAME CHANGE:	20080813

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			ORBIMED ADVISORS LLC
		CENTRAL INDEX KEY:			0001055951
		IRS NUMBER:				133976876
		STATE OF INCORPORATION:			DE

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		601 LEXINGTON AVENUE
		STREET 2:		54TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022
		BUSINESS PHONE:		(212) 739-6400

	MAIL ADDRESS:	
		STREET 1:		601 LEXINGTON AVENUE
		STREET 2:		54TH FLOOR
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10022
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>ss1758599_sc13g.htm
<DESCRIPTION>SCHEDULE 13G
<TEXT>
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<!-- 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="font: 12pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>UNITED STATES</B></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>SECURITIES AND EXCHANGE COMMISSION<BR>
Washington, DC 20549</B></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>SCHEDULE 13G</B></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>&nbsp;</B></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0; text-align: center"><B>Under the Securities Exchange Act of 1934</B></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>

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

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%; border-collapse: collapse">
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  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font: 12pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-size: 10pt">(Name of Issuer)</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: Black 1pt solid; font: 12pt Times New Roman, Times, Serif; padding-right: 5.4pt; padding-left: 5.4pt; text-align: center"><FONT STYLE="font-size: 10pt; background-color: white"><B>Common Stock, $0.0001 par value per share</B></FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font: 12pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-size: 10pt">(Title of Class of Securities)</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">&nbsp;</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-bottom: 1pt; border-bottom: Black 1pt solid; font: 12pt Times New Roman, Times, Serif; padding-right: 5.4pt; padding-left: 5.4pt; text-align: center"><FONT STYLE="font-size: 10pt; background-color: white"><B>59045L106</B></FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font: 12pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-size: 10pt">(CUSIP Number)</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="border-bottom: Black 1pt solid; font: 12pt Times New Roman, Times, Serif; padding-right: 5.4pt; padding-left: 5.4pt; text-align: center"><FONT STYLE="font-size: 10pt"><B>December 31, 2022</B></FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="padding-right: 5.4pt; padding-left: 5.4pt; font: 12pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-size: 10pt">(Date of Event Which Requires Filing of this Statement)</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

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

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

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"><FONT STYLE="font-family: Wingdings">x</FONT>
<FONT STYLE="font-size: 10pt">Rule 13d-1(b)</FONT></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"><FONT STYLE="font-family: Wingdings">o</FONT>
<FONT STYLE="font-size: 10pt">Rule 13d-1(c)</FONT></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify"><FONT STYLE="font-family: Wingdings">o</FONT>
<FONT STYLE="font-size: 10pt">Rule 13d-1(d)</FONT></P>

<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0 0 0 0.5in; text-align: justify">&nbsp;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">*The remainder of this cover page shall be filled
out for a reporting person&rsquo;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: 0">&nbsp;</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">The information required in the remainder of this
cover page shall not be deemed to be &ldquo;filed&rdquo; for the purpose of Section 18 of the Securities Exchange Act of 1934 (&ldquo;Act&rdquo;)
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: 0">&nbsp;</P>

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






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

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    <TD STYLE="width: 30%; border: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 6pt"><FONT STYLE="font-size: 10pt"><B>CUSIP No. <FONT STYLE="background-color: white">59045L106</FONT></B></FONT></TD>
    <TD STYLE="width: 40%; padding: 6pt; font: 12pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-size: 10pt">&nbsp;<B>SCHEDULE 13G</B></FONT></TD>
    <TD STYLE="width: 30%; border: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 6pt; text-align: right"><FONT STYLE="font-size: 10pt"><B>Page&nbsp;2 of&nbsp;7 Pages</B></FONT></TD></TR>
  </TABLE>
<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%">
  <TR>
    <TD STYLE="width: 7%; border-bottom: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt">&nbsp;</TD>
    <TD STYLE="width: 11%; border-bottom: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt">&nbsp;</TD>
    <TD STYLE="width: 7%; border-bottom: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt">&nbsp;</TD>
    <TD STYLE="width: 70%; border-bottom: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt">&nbsp;</TD>
    <TD STYLE="width: 5%; border-bottom: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt">&nbsp;</TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">1</FONT></TD>
    <TD COLSPAN="4" STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">NAME OF REPORTING PERSONS</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">OrbiMed Capital LLC</P></TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">2</FONT></TD>
    <TD COLSPAN="3" STYLE="border-bottom: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">(a) <FONT STYLE="font-family: Wingdings">o</FONT></P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">(b) <FONT STYLE="font-family: Wingdings">o</FONT></P></TD>
    <TD STYLE="white-space: nowrap; border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt">&nbsp;</TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">3</FONT></TD>
    <TD COLSPAN="4" STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt"><FONT STYLE="font-size: 10pt">SEC USE ONLY</FONT></TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">4</FONT></TD>
    <TD COLSPAN="4" STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">CITIZENSHIP OR PLACE OF ORGANIZATION</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">Delaware</P></TD></TR>
  <TR>
    <TD COLSPAN="2" ROWSPAN="4" STYLE="border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">NUMBER OF</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">SHARES</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">BENEFICIALLY</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">OWNED BY</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">EACH</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">REPORTING</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">PERSON</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">WITH</P></TD>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">5</FONT></TD>
    <TD COLSPAN="2" STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">SOLE VOTING POWER</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">7,082,837</P></TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">6</FONT></TD>
    <TD COLSPAN="2" STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">SHARED VOTING POWER</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">0</P></TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">7</FONT></TD>
    <TD COLSPAN="2" STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">SOLE DISPOSITIVE POWER</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">7,082,837</P></TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">8</FONT></TD>
    <TD COLSPAN="2" STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">SHARED DISPOSITIVE POWER</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">0</P></TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">9</FONT></TD>
    <TD COLSPAN="4" STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">7,082,837</P></TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">10</FONT></TD>
    <TD COLSPAN="3" STYLE="border-bottom: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt"><FONT STYLE="font-size: 10pt">CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES </FONT></TD>
    <TD STYLE="vertical-align: top; border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-family: Wingdings; font-size: 10pt">o</FONT></TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">11</FONT></TD>
    <TD COLSPAN="4" STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">7.1%</P></TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">12</FONT></TD>
    <TD COLSPAN="4" STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">TYPE OF REPORTING PERSON</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">IA</P></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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

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

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

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    <TD STYLE="width: 30%; border: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 6pt"><FONT STYLE="font-size: 10pt"><B>CUSIP No. <FONT STYLE="background-color: white">59045L106</FONT></B></FONT></TD>
    <TD STYLE="width: 40%; padding: 6pt; font: 12pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-size: 10pt">&nbsp;<B>SCHEDULE 13G</B></FONT></TD>
    <TD STYLE="width: 30%; border: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 6pt; text-align: right"><FONT STYLE="font-size: 10pt"><B>Page&nbsp;3 of&nbsp;7 Pages</B></FONT></TD></TR>
  </TABLE>
<P STYLE="font: 12pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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    <TD STYLE="width: 7%; border-bottom: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt">&nbsp;</TD>
    <TD STYLE="width: 11%; border-bottom: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt">&nbsp;</TD>
    <TD STYLE="width: 7%; border-bottom: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt">&nbsp;</TD>
    <TD STYLE="width: 70%; border-bottom: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt">&nbsp;</TD>
    <TD STYLE="width: 5%; border-bottom: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt">&nbsp;</TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">1</FONT></TD>
    <TD COLSPAN="4" STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">NAME OF REPORTING PERSONS</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">OrbiMed Advisors LLC</P></TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">2</FONT></TD>
    <TD COLSPAN="3" STYLE="border-bottom: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">(a) <FONT STYLE="font-family: Wingdings">o</FONT></P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">(b) <FONT STYLE="font-family: Wingdings">o</FONT></P></TD>
    <TD STYLE="white-space: nowrap; border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt">&nbsp;</TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">3</FONT></TD>
    <TD COLSPAN="4" STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt"><FONT STYLE="font-size: 10pt">SEC USE ONLY</FONT></TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">4</FONT></TD>
    <TD COLSPAN="4" STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">CITIZENSHIP OR PLACE OF ORGANIZATION</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">Delaware</P></TD></TR>
  <TR>
    <TD COLSPAN="2" ROWSPAN="4" STYLE="border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">NUMBER OF</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">SHARES</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">BENEFICIALLY</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">OWNED BY</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">EACH</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">REPORTING</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">PERSON</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center">WITH</P></TD>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">5</FONT></TD>
    <TD COLSPAN="2" STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">SOLE VOTING POWER</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">0</P></TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">6</FONT></TD>
    <TD COLSPAN="2" STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">SHARED VOTING POWER</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">1,928,600</P></TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">7</FONT></TD>
    <TD COLSPAN="2" STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">SOLE DISPOSITIVE POWER</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">0</P></TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">8</FONT></TD>
    <TD COLSPAN="2" STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">SHARED DISPOSITIVE POWER</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">1,928,600</P></TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">9</FONT></TD>
    <TD COLSPAN="4" STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">1,928,600</P></TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">10</FONT></TD>
    <TD COLSPAN="3" STYLE="border-bottom: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt"><FONT STYLE="font-size: 10pt">CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES </FONT></TD>
    <TD STYLE="vertical-align: top; border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-family: Wingdings; font-size: 10pt">o</FONT></TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">11</FONT></TD>
    <TD COLSPAN="4" STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">1.9%</P></TD></TR>
  <TR>
    <TD STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; border-left: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 2.25pt; text-align: center"><FONT STYLE="font-size: 14pt">12</FONT></TD>
    <TD COLSPAN="4" STYLE="border-right: black 1.5pt solid; border-bottom: black 1.5pt solid; padding: 2.25pt">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">TYPE OF REPORTING PERSON</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">IA</P></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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    <TD STYLE="width: 30%; border: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 6pt"><FONT STYLE="font-size: 10pt"><B>CUSIP No.&nbsp;&nbsp;<FONT STYLE="background-color: white">59045L106</FONT></B></FONT></TD>
    <TD STYLE="width: 40%; padding: 6pt; font: 12pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-size: 10pt">&nbsp;<B>SCHEDULE 13G</B></FONT></TD>
    <TD STYLE="width: 30%; border: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 6pt; text-align: right"><FONT STYLE="font-size: 10pt"><B>Page 4 of&nbsp;7 Pages</B></FONT></TD></TR>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

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  <TR STYLE="vertical-align: top">
    <TD STYLE="white-space: nowrap; width: 44px; padding-bottom: 6pt; font: 12pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt; letter-spacing: -0.15pt"><B>Item 1.</B></FONT></TD>
    <TD STYLE="width: 7px">&nbsp;</TD>
    <TD STYLE="padding-bottom: 6pt; font: 12pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt; letter-spacing: -0.15pt"><B>(a) Name of Issuer:</B></FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6pt 22pt; text-align: justify; text-indent: 22pt">Mersana Therapeutics,
Inc.</P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="width: 100%">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 44px">&nbsp;</TD>
    <TD STYLE="width: 7px">&nbsp;</TD>
    <TD STYLE="padding-bottom: 6pt; font: 12pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt; letter-spacing: -0.15pt"><B>(b) Address of Issuer&rsquo;s Principal Executive Offices:</B></FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6pt 22pt; text-align: justify; text-indent: 22pt">840 Memorial Drive</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6pt 22pt; text-align: justify; text-indent: 22pt">Cambridge, Massachusetts
02139</P>

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  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 44px; padding-bottom: 6pt; font: 12pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt; letter-spacing: -0.15pt"><B>Item 2.</B></FONT></TD>
    <TD STYLE="width: 7px">&nbsp;</TD>
    <TD STYLE="padding-bottom: 6pt; font: 12pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt; letter-spacing: -0.15pt"><B>(a) Name of Person Filing</B></FONT><FONT STYLE="font-size: 10pt">:</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6pt 44pt; text-align: justify">OrbiMed Capital LLC</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6pt 44pt; text-align: justify">OrbiMed Advisors LLC</P>

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  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 44px">&nbsp;</TD>
    <TD STYLE="width: 7px">&nbsp;</TD>
    <TD STYLE="padding-bottom: 6pt; font: 12pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt; letter-spacing: -0.15pt"><B>(b) Address of Principal Business Office:</B></FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6pt 44pt; text-align: justify">601 Lexington Avenue, 54th Floor</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6pt 44pt; text-align: justify">New York, NY 10022</P>

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  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 44px">&nbsp;</TD>
    <TD STYLE="width: 7px">&nbsp;</TD>
    <TD STYLE="padding-bottom: 6pt; font: 12pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt; letter-spacing: -0.15pt"><B>(c) Citizenship</B>:</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6pt 22pt; text-align: justify; text-indent: 22pt">Please refer to Item
4 on each cover page for each Reporting Person.</P>

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  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 44px; padding-bottom: 6pt; font: 12pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="width: 7px">&nbsp;</TD>
    <TD STYLE="padding-bottom: 6pt; font: 12pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt; letter-spacing: -0.15pt"><B>(d) Title of Class of Securities:</B></FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6pt 22pt; text-align: justify; text-indent: 22pt"><FONT STYLE="background-color: white">Common
Stock, $0.0001 par value per share</FONT></P>

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  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 44px; padding-bottom: 6pt; font: 12pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="width: 7px">&nbsp;</TD>
    <TD STYLE="padding-bottom: 6pt; font: 12pt Times New Roman, Times, Serif; text-align: justify"><FONT STYLE="font-size: 10pt; letter-spacing: -0.15pt"><B>(e) CUSIP No.:</B></FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 45pt">59045L106&nbsp;</P>

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

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    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 6pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
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    <TD STYLE="width: 30%; border: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 6pt"><FONT STYLE="font-size: 10pt"><B>CUSIP No.&nbsp;<FONT STYLE="background-color: white">59045L106</FONT></B></FONT></TD>
    <TD STYLE="width: 40%; padding: 6pt; font: 12pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-size: 10pt">&nbsp;<B>SCHEDULE 13G</B></FONT></TD>
    <TD STYLE="width: 30%; border: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 6pt; text-align: right"><FONT STYLE="font-size: 10pt"><B>Page&nbsp;5 of&nbsp;7 Pages</B></FONT></TD></TR>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

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  <TR STYLE="vertical-align: bottom">
    <TD STYLE="font: 12pt Times New Roman, Times, Serif; text-align: center">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 100%">
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 12pt 1in; text-align: justify; text-indent: -1in"><B>Item 3. </B>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</P>
    <P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6pt 44pt; text-align: justify">OrbiMed Advisors LLC (&ldquo;Advisors&rdquo;)
    and OrbiMed Capital LLC (&ldquo;Capital&rdquo;) are investment advisors in accordance with ss.240.13d-1(b)(1)(ii)(E).</P></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0">&nbsp;</P>

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

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    <DIV STYLE="break-before: page; margin-top: 6pt; margin-bottom: 6pt"><P STYLE="margin: 0pt">&nbsp;</P></DIV>
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    <TD STYLE="width: 30%; border: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 6pt"><FONT STYLE="font-size: 10pt"><B>CUSIP No.&nbsp;<FONT STYLE="background-color: white">59045L106</FONT></B></FONT></TD>
    <TD STYLE="width: 40%; padding: 6pt; font: 12pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-size: 10pt">&nbsp;<B>SCHEDULE 13G</B></FONT></TD>
    <TD STYLE="width: 30%; border: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 6pt; text-align: right"><FONT STYLE="font-size: 10pt"><B>Page 6 of&nbsp;7 Pages</B></FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify">&nbsp;</P>

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

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.15pt"><B>Item 4. Ownership:</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6pt 44pt; text-align: justify">Information with respect to the Reporting
Person&rsquo;s ownership as of December 31, 2022 is incorporated by reference to items (5) - (9) and (11) of the cover page for the Reporting
Person.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.15pt"><B>Item 5. Ownership
of Five Percent or Less of a Class.</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6pt 44pt; text-align: justify">If this statement is being filed to report
the fact that as of the date hereof the Reporting Person has ceased to be the beneficial owner of more than five percent of the class
of securities, check the following [ ].</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.15pt"><B>Item 6. Ownership
of More Than Five Percent on Behalf of Another Person</B></FONT>.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6pt 44pt; text-align: justify">The Reporting Persons are holding 9.0%
of the shares in the aggregate on behalf of other persons who have the right to receive or the power to direct the receipt of dividends
from, or proceeds from the sale of, such securities. No one such other person's interest in the securities whose ownership is reported
here relates to more than five percent of the class. Advisors and Capital exercise investment and voting power over the shares through
a management committee comprised of Carl L. Gordon, Sven H. Borho, and W. Carter Neild, each of whom disclaims beneficial ownership of
the Common Stock reported herein.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 31.5pt; text-align: justify; text-indent: -31.5pt"><FONT STYLE="letter-spacing: -0.15pt"><B>Item
7. Identification and Classification of the Subsidiary which Acquired the Security Being Reported on by the Parent Holding Company or
Control Person.</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6pt 22pt; text-align: justify; text-indent: 22pt">Not Applicable.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 1in; text-align: justify; text-indent: -1in"><FONT STYLE="letter-spacing: -0.15pt"><B>Item
8. Identification and Classification of Members of the Group</B></FONT>.</P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6pt 22pt; text-align: justify; text-indent: 22pt"><FONT STYLE="letter-spacing: -0.15pt">Not
Applicable.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 1in; text-align: justify; text-indent: -1in"><FONT STYLE="letter-spacing: -0.15pt"><B>Item
9. Notice of Dissolution of Group</B>.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6pt 22pt; text-align: justify; text-indent: 22pt"><FONT STYLE="letter-spacing: -0.15pt">Not
Applicable.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 1in; text-align: justify; text-indent: -1in"><FONT STYLE="letter-spacing: -0.15pt"><B>Item
10. Certification.</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 6pt 44pt; text-align: justify"><FONT STYLE="letter-spacing: -0.15pt">By
signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and 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
that purpose or effect.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0 0 0 1in; text-align: justify; text-indent: -1in"><FONT STYLE="letter-spacing: -0.15pt">&nbsp;</FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="letter-spacing: -0.15pt">&nbsp;</FONT></P>

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    <TD STYLE="width: 30%; border: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 6pt"><FONT STYLE="font-size: 10pt"><B>CUSIP No.&nbsp;<FONT STYLE="background-color: white">59045L106</FONT></B></FONT></TD>
    <TD STYLE="width: 40%; padding: 6pt; font: 12pt Times New Roman, Times, Serif; text-align: center"><FONT STYLE="font-size: 10pt">&nbsp;<B>SCHEDULE 13G</B></FONT></TD>
    <TD STYLE="width: 30%; border: black 1.5pt solid; font: 12pt Times New Roman, Times, Serif; padding: 6pt; text-align: right"><FONT STYLE="font-size: 10pt"><B>Page&nbsp;7 of&nbsp;7 Pages</B></FONT></TD></TR>
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.15pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="letter-spacing: -0.15pt"><B><U>SIGNATURES</U></B></FONT></P>

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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify; text-indent: 0.5in"><FONT STYLE="letter-spacing: -0.15pt">After
reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete
and correct.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.15pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.15pt">Dated: February
14, 2023</FONT></P>

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    <TD STYLE="width: 51%; font: 12pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="width: 3%; font: 12pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="width: 5%; font: 12pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="width: 41%; font: 12pt Times New Roman, Times, Serif">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="font: 12pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD COLSPAN="3" STYLE="font: 12pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt"><B>OrbiMed Advisors LLC</B></FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="font: 12pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 12pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 12pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 12pt Times New Roman, Times, Serif">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="font: 12pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 12pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">By:</FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: black 1pt solid; font: 12pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">/s/ Carl L. Gordon</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="font: 12pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 12pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 12pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">Name:</FONT></TD>
    <TD STYLE="font: 12pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;Carl L. Gordon</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD STYLE="font: 12pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 12pt Times New Roman, Times, Serif">&nbsp;</TD>
    <TD STYLE="font: 12pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">Title:</FONT></TD>
    <TD STYLE="font: 12pt Times New Roman, Times, Serif"><FONT STYLE="font-size: 10pt">&nbsp;Member</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="letter-spacing: -0.15pt"><B>&nbsp;</B></FONT></P>

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    <TD STYLE="width: 51%">&nbsp;</TD>
    <TD STYLE="width: 3%">&nbsp;</TD>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="width: 41%">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD COLSPAN="3"><FONT STYLE="font-size: 10pt"><B>OrbiMed Capital LLC</B></FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">By:</FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: black 1pt solid"><FONT STYLE="font-size: 10pt">/s/ Carl L. Gordon</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">Name:</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;Carl L. Gordon</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">Title:</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;Member</FONT></TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="letter-spacing: -0.15pt"><B>&nbsp;</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="letter-spacing: -0.15pt">&nbsp;</FONT></P>

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<DOCUMENT>
<TYPE>EX-99.A
<SEQUENCE>2
<FILENAME>ss1758599_ex99a.htm
<DESCRIPTION>JOINT FILING AGREEMENT
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<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="letter-spacing: -0.15pt"><B>EXHIBIT A</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="letter-spacing: -0.15pt"><B>JOINT FILING
AGREEMENT</B></FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.15pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.15pt">The undersigned
hereby agree that the Statement on this Schedule 13G dated December 31, 2022 (the &ldquo;Schedule 13G&rdquo;), with respect to the </FONT><FONT STYLE="background-color: white">Common
Stock, $0.0001 par value per share</FONT><FONT STYLE="letter-spacing: -0.15pt">, of Mersana Therapeutics, Inc. is filed on behalf of each
of us pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended, and that
this Agreement shall be included as an Exhibit to this Schedule 13G. Each of the undersigned agrees to be responsible for the timely filing
of the Schedule 13G, and for the completeness and accuracy of the information concerning itself contained therein. This Agreement may
be executed in any number of counterparts, all of which taken together shall constitute one and the same instrument.</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.15pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: justify"><FONT STYLE="letter-spacing: -0.15pt">IN WITNESS WHEREOF,
the undersigned have executed this Agreement as of February 14, 2023.</FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
  <TR STYLE="vertical-align: top">
    <TD STYLE="width: 51%">&nbsp;</TD>
    <TD STYLE="width: 3%">&nbsp;</TD>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="width: 41%">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD COLSPAN="3"><FONT STYLE="font-size: 10pt"><B>OrbiMed Advisors LLC</B></FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">By:</FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: black 1pt solid"><FONT STYLE="font-size: 10pt">/s/ Carl L. Gordon</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">Name:</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;Carl L. Gordon</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">Title:</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;Member</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0; text-align: center"><FONT STYLE="letter-spacing: -0.15pt"><B>&nbsp;</B></FONT></P>

<TABLE CELLSPACING="0" CELLPADDING="0" STYLE="font: 12pt Times New Roman, Times, Serif; width: 100%; border-collapse: collapse">
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    <TD STYLE="width: 51%">&nbsp;</TD>
    <TD STYLE="width: 3%">&nbsp;</TD>
    <TD STYLE="width: 5%">&nbsp;</TD>
    <TD STYLE="width: 41%">&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD COLSPAN="3"><FONT STYLE="font-size: 10pt"><B>OrbiMed Capital LLC</B></FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">By:</FONT></TD>
    <TD COLSPAN="2" STYLE="border-bottom: black 1pt solid"><FONT STYLE="font-size: 10pt">/s/ Carl L. Gordon</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">Name:</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;Carl L. Gordon</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD><FONT STYLE="font-size: 10pt">Title:</FONT></TD>
    <TD><FONT STYLE="font-size: 10pt">&nbsp;Member</FONT></TD></TR>
  <TR STYLE="vertical-align: top">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD></TR>
  </TABLE>
<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="letter-spacing: -0.15pt">&nbsp;</FONT></P>

<P STYLE="font: 10pt Times New Roman, Times, Serif; margin: 0"><FONT STYLE="letter-spacing: -0.15pt">&nbsp;</FONT></P>

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