CUSIP
No. 59045L106
|
13D
|
Page
2 of 19 Pages
|
1.
|
|
NAMES
OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
New
Enterprise Associates 14, L.P.
|
|
|
2.
|
|
CHECK
THE APPROPRIATE BOX IF A MEMBER OF A GROUP (see instructions)
|
|
(a)
☐
(b)
☐
|
3.
|
|
SEC
USE ONLY
|
|
|
4.
|
|
SOURCE
OF FUNDS (see instructions)
WC
|
|
|
5.
|
|
CHECK
BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
|
|
☐
|
6.
|
|
CITIZENSHIP
OR PLACE OF ORGANIZATION
Cayman
Islands
|
|
|
|
|
|
|
|
NUMBER
OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH
|
|
7.
|
|
SOLE
VOTING POWER
0
Shares
|
|
8.
|
|
SHARED
VOTING POWER
5,959,520 shares
|
|
9.
|
|
SOLE
DISPOSITIVE POWER
0
Shares
|
|
10.
|
|
SHARED
DISPOSITIVE POWER
5,959,520 shares
|
|
|
|
|
|
11.
|
|
AGGREGATE
AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
5,959,520 shares
|
|
|
12.
|
|
CHECK
BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (see instructions)
|
|
☐
|
13.
|
|
PERCENT
OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
8.7%
|
|
|
14.
|
|
TYPE
OF REPORTING PERSON (see instructions)
PN
|
|
|
CUSIP
No. 59045L106
|
13D
|
Page
3 of 19 Pages
|
1.
|
|
NAMES
OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
NEA
Partners 14, L.P.
|
|
|
2.
|
|
CHECK
THE APPROPRIATE BOX IF A MEMBER OF A GROUP (see instructions)
|
|
(a)
☐
(b)
☐
|
3.
|
|
SEC
USE ONLY
|
|
|
4.
|
|
SOURCE
OF FUNDS (see instructions)
AF
|
|
|
5.
|
|
CHECK
BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
|
|
☐
|
6.
|
|
CITIZENSHIP
OR PLACE OF ORGANIZATION
Cayman
Islands
|
|
|
|
|
|
|
|
NUMBER
OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH
|
|
7.
|
|
SOLE
VOTING POWER
0
Shares
|
|
8.
|
|
SHARED
VOTING POWER
5,959,520 shares
|
|
9.
|
|
SOLE
DISPOSITIVE POWER
0
Shares
|
|
10.
|
|
SHARED
DISPOSITIVE POWER
5,959,520 shares
|
|
|
|
|
|
11.
|
|
AGGREGATE
AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
5,959,520 shares
|
|
|
12.
|
|
CHECK
BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (see instructions)
|
|
☐
|
13.
|
|
PERCENT
OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
8.7%
|
|
|
14.
|
|
TYPE
OF REPORTING PERSON (see instructions)
PN
|
|
|
CUSIP
No. 59045L106
|
13D
|
Page
4 of 19 Pages
|
1.
|
|
NAMES
OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
NEA
14 GP, LTD
|
|
|
2.
|
|
CHECK
THE APPROPRIATE BOX IF A MEMBER OF A GROUP (see instructions)
|
|
(a)
☐
(b)
☐
|
3.
|
|
SEC
USE ONLY
|
|
|
4.
|
|
SOURCE
OF FUNDS (see instructions)
AF
|
|
|
5.
|
|
CHECK
BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
|
|
☐
|
6.
|
|
CITIZENSHIP
OR PLACE OF ORGANIZATION
Cayman
Islands
|
|
|
|
|
|
|
|
NUMBER
OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH
|
|
7.
|
|
SOLE
VOTING POWER
0
Shares
|
|
8.
|
|
SHARED
VOTING POWER
5,959,520 shares
|
|
9.
|
|
SOLE
DISPOSITIVE POWER
0
Shares
|
|
10.
|
|
SHARED
DISPOSITIVE POWER
5,959,520 shares
|
|
|
|
|
|
11.
|
|
AGGREGATE
AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
5,959,520 shares
|
|
|
12.
|
|
CHECK
BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (see instructions)
|
|
☐
|
13.
|
|
PERCENT
OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
8.7%
|
|
|
14.
|
|
TYPE
OF REPORTING PERSON (see instructions)
CO
|
|
|
CUSIP
No. 59045L106
|
13D
|
Page
5 of 19 Pages
|
1.
|
|
NAMES
OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
Forest
Baskett
|
|
|
2.
|
|
CHECK
THE APPROPRIATE BOX IF A MEMBER OF A GROUP (see instructions)
|
|
(a)
☐
(b)
☐
|
3.
|
|
SEC
USE ONLY
|
|
|
4.
|
|
SOURCE
OF FUNDS (see instructions)
AF
|
|
|
5.
|
|
CHECK
BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
|
|
☐
|
6.
|
|
CITIZENSHIP
OR PLACE OF ORGANIZATION
United
States
|
|
|
|
|
|
|
|
NUMBER
OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH
|
|
7.
|
|
SOLE
VOTING POWER
1,602 shares
|
|
8.
|
|
SHARED
VOTING POWER
5,959,520 shares
|
|
9.
|
|
SOLE
DISPOSITIVE POWER
1,602 shares
|
|
10.
|
|
SHARED
DISPOSITIVE POWER
5,959,520 shares
|
|
|
|
|
|
11.
|
|
AGGREGATE
AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
5,961,122 shares
|
|
|
12.
|
|
CHECK
BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (see instructions)
|
|
☐
|
13.
|
|
PERCENT
OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
8.7%
|
|
|
14.
|
|
TYPE
OF REPORTING PERSON (see instructions)
IN
|
|
|
CUSIP
No. 59045L106
|
13D
|
Page
6 of 19 Pages
|
1.
|
|
NAMES
OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
Anthony
A. Florence, Jr.
|
|
|
2.
|
|
CHECK
THE APPROPRIATE BOX IF A MEMBER OF A GROUP (see instructions)
|
|
(a)
☐
(b)
☐
|
3.
|
|
SEC
USE ONLY
|
|
|
4.
|
|
SOURCE
OF FUNDS (see instructions)
AF
|
|
|
5.
|
|
CHECK
BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
|
|
☐
|
6.
|
|
CITIZENSHIP
OR PLACE OF ORGANIZATION
United
States
|
|
|
|
|
|
|
|
NUMBER
OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH
|
|
7.
|
|
SOLE
VOTING POWER
3,210 shares
|
|
8.
|
|
SHARED
VOTING POWER
5,959,520 shares
|
|
9.
|
|
SOLE
DISPOSITIVE POWER
3,210 shares
|
|
10.
|
|
SHARED
DISPOSITIVE POWER
5,959,520 shares
|
|
|
|
|
|
11.
|
|
AGGREGATE
AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
5,962,730 shares
|
|
|
12.
|
|
CHECK
BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (see instructions)
|
|
☐
|
13.
|
|
PERCENT
OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
8.7%
|
|
|
14.
|
|
TYPE
OF REPORTING PERSON (see instructions)
IN
|
|
|
CUSIP
No. 59045L106
|
13D
|
Page
7 of 19 Pages
|
1.
|
|
NAMES
OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
Patrick
J. Kerins
|
|
|
2.
|
|
CHECK
THE APPROPRIATE BOX IF A MEMBER OF A GROUP (see instructions)
|
|
(a)
☐
(b)
☐
|
3.
|
|
SEC
USE ONLY
|
|
|
4.
|
|
SOURCE
OF FUNDS (see instructions)
AF
|
|
|
5.
|
|
CHECK
BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
|
|
☐
|
6.
|
|
CITIZENSHIP
OR PLACE OF ORGANIZATION
United
States
|
|
|
|
|
|
|
|
NUMBER
OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH
|
|
7.
|
|
SOLE
VOTING POWER
3,594 shares
|
|
8.
|
|
SHARED
VOTING POWER
5,959,520 shares
|
|
9.
|
|
SOLE
DISPOSITIVE POWER
3,594 shares
|
|
10.
|
|
SHARED
DISPOSITIVE POWER
5,959,520 shares
|
|
|
|
|
|
11.
|
|
AGGREGATE
AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
5,963,114 shares
|
|
|
12.
|
|
CHECK
BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (see instructions)
|
|
☐
|
13.
|
|
PERCENT
OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
8.7%
|
|
|
14.
|
|
TYPE
OF REPORTING PERSON (see instructions)
IN
|
|
|
CUSIP
No. 59045L106
|
13D
|
Page
8 of 19 Pages
|
1.
|
|
NAMES
OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
Scott
D. Sandell
|
|
|
2.
|
|
CHECK
THE APPROPRIATE BOX IF A MEMBER OF A GROUP (see instructions)
|
|
(a)
☐
(b)
☐
|
3.
|
|
SEC
USE ONLY
|
|
|
4.
|
|
SOURCE
OF FUNDS (see instructions)
AF
|
|
|
5.
|
|
CHECK
BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
|
|
☐
|
6.
|
|
CITIZENSHIP
OR PLACE OF ORGANIZATION
United
States
|
|
|
|
|
|
|
|
NUMBER
OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH
|
|
7.
|
|
SOLE
VOTING POWER
1,105 shares
|
|
8.
|
|
SHARED
VOTING POWER
5,959,520 shares
|
|
9.
|
|
SOLE
DISPOSITIVE POWER
1,105 shares
|
|
10.
|
|
SHARED
DISPOSITIVE POWER
5,959,520 shares
|
|
|
|
|
|
11.
|
|
AGGREGATE
AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
5,960,625
shares
|
|
|
12.
|
|
CHECK
BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (see instructions)
|
|
☐
|
13.
|
|
PERCENT
OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
8.7%
|
|
|
14.
|
|
TYPE
OF REPORTING PERSON (see instructions)
IN
|
|
|
CUSIP
No. 59045L106
|
13D
|
Page
9 of 19 Pages
|
1.
|
|
NAMES
OF REPORTING PERSONS I.R.S. IDENTIFICATION NOS. OF ABOVE PERSONS (ENTITIES ONLY)
Peter
W. Sonsini
|
|
|
2.
|
|
CHECK
THE APPROPRIATE BOX IF A MEMBER OF A GROUP (see instructions)
|
|
(a)
☐
(b)
☐
|
3.
|
|
SEC
USE ONLY
|
|
|
4.
|
|
SOURCE
OF FUNDS (see instructions)
AF
|
|
|
5.
|
|
CHECK
BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT TO ITEMS 2(d) or 2(e)
|
|
☐
|
6.
|
|
CITIZENSHIP
OR PLACE OF ORGANIZATION
United
States
|
|
|
|
|
|
|
|
NUMBER
OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH
|
|
7.
|
|
SOLE
VOTING POWER
1,341 shares
|
|
8.
|
|
SHARED
VOTING POWER
5,959,520 shares
|
|
9.
|
|
SOLE
DISPOSITIVE POWER
1,341 shares
|
|
10.
|
|
SHARED
DISPOSITIVE POWER
5,959,520 shares
|
|
|
|
|
|
11.
|
|
AGGREGATE
AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
5,960,861 shares
|
|
|
12.
|
|
CHECK
BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES (see instructions)
|
|
☐
|
13.
|
|
PERCENT
OF CLASS REPRESENTED BY AMOUNT IN ROW (11)
8.7%
|
|
|
14.
|
|
TYPE
OF REPORTING PERSON (see instructions)
IN
|
|
|
CUSIP
No. 59045L106
|
13D
|
Page
10 of 19 Pages
|
Item
1. Security and Issuer.
This
Amendment No. 3 (“Amendment No. 3”) to Schedule 13D amends and restates the statement on Schedule 13D originally filed
on July 11, 2017, Amendment No. 1 thereto filed on March 14, 2019 and Amendment No. 2 thereto filed on April 24, 2020 relating
to the common stock, $.0001 par value (the “Common Stock”) of Mersana Therapeutics, Inc. (the “Issuer”)
having its principal executive office at 840 Memorial Drive, Cambridge, Massachusetts 02139.
Certain
terms used but not defined in this Amendment No. 3 have the meanings assigned thereto in the Schedule 13D (including Amendment
No. 1 and Amendment No. 2 thereto). Except as specifically set forth herein, this Amendment No. 3 does not modify any of the information
previously reported on the Schedule 13D (including Amendment No. 1 and Amendment No. 2 thereto).
Item
2. Identity and Background.
This
statement is being filed by:
(a)
New Enterprise Associates 14, L.P. (“NEA 14”);
(b)
NEA Partners 14, L.P. (“NEA Partners 14”), which is the sole general partner of NEA 14; and NEA 14 GP, LTD (“NEA
14 LTD” and, together with NEA Partners 14, the “Control Entities”), which is the sole general partner of NEA
Partners 14; and
(c)
Forest Baskett (“Baskett”), Anthony A. Florence, Jr. (“Florence”), Patrick J. Kerins (“Kerins”),
Scott D. Sandell (“Sandell”) and Peter W. Sonsini (“Sonsini”) (together, the “Directors”).
The Directors are the directors of NEA 14 LTD.
The
persons named in this Item 2 are referred to individually herein as a “Reporting Person” and collectively as the “Reporting
Persons.”
The
address of the principal business office of NEA 14 and each Control Entity is New Enterprise Associates, 1954 Greenspring Drive,
Suite 600, Timonium, MD 21093. The address of the principal business office of each of Kerins is New Enterprise Associates, 5425
Wisconsin Avenue, Suite 800, Chevy Chase, MD 20815. The address of the principal business office of Baskett, Sandell and Sonsini
is New Enterprise Associates, 2855 Sand Hill Road, Menlo Park, California 94025. The address of the principal business office
of Florence is New Enterprise Associates, 104 5th Avenue, 19th Floor, New York, NY 10001.
The
principal business of NEA 14 is to invest in and assist growth-oriented businesses located principally in the United States. The
principal business of NEA Partners 14 is to act as the sole general partner of NEA 14. The principal business of NEA 14 LTD is
to act as the sole general partner of NEA Partners 14. The principal business of each of the Directors is to manage the Control
Entities, NEA 14 and a number of affiliated partnerships with similar businesses.
During
the five years prior to the date hereof, none of the Reporting Persons has been convicted in a criminal proceeding or has been
a party to a civil proceeding ending in a judgment, decree or final order enjoining future violations of, or prohibiting or mandating
activities subject to, federal or state securities laws or finding any violation with respect to such laws.
NEA
14 and NEA Partners 14 are exempted limited partnerships organized under the laws of the Cayman Islands. NEA 14 LTD is an exempted
company organized under the laws of the Cayman Islands. Each of the Directors is a United States citizen.
CUSIP
No. 59045L106
|
13D
|
Page
11 of 19 Pages
|
Item 3. Source and Amount
of Funds or Other Consideration.
On
September 14, 2020, NEA 14 engaged in a stock distribution of 2,000,000 shares of the Issuer’s Common Stock to its partners
for no consideration. NEA Partners 14 acquired 20,000 shares of the Issuer’s Common Stock as a result of the NEA 14 distribution
and subsequently engaged in a stock distribution of 20,000 shares of the Issuer’s Common Stock to its partners for no consideration.
NEA 14 now holds a total of 5,959,520 shares of the Issuer’s Common Stock (the “NEA 14 Shares”).
The
working capital of NEA 14 was the source of the funds for the purchase of the NEA 14 Shares. No part of the purchase price of
the NEA 14 Shares was represented by funds or other consideration borrowed or otherwise obtained for the purpose of acquiring,
holding, trading or voting the NEA 14 Shares.
Item
4. Purpose of Transaction.
NEA
14 acquired the NEA 14 Shares for investment purposes. Depending on market conditions, its continuing evaluation of the business
and prospects of the Issuer and other factors, NEA 14 and other Reporting Persons may dispose of or acquire additional shares
of the Issuer. Except as set forth above, none of the Reporting Persons has any present plans which relate to or would result
in:
|
(a)
|
The acquisition by any person of additional securities of the Issuer, or the disposition of securities
of the Issuer;
|
|
(b)
|
An extraordinary corporate transaction, such as a merger, reorganization or liquidation, involving
the Issuer or any of its subsidiaries;
|
|
(c)
|
A sale or transfer of a material amount of assets of the Issuer or any of its subsidiaries;
|
|
(d)
|
Any change in the present board of directors or management of the Issuer, including any plans or
proposals to change the number or term of directors or to fill any existing vacancies on the board;
|
|
(e)
|
Any material change in the present capitalization or dividend policy of the Issuer;
|
|
(f)
|
Any other material change in the Issuer’s business or corporate structure;
|
|
(g)
|
Changes in the Issuer’s charter, bylaws or instruments corresponding thereto or other actions
which may impede the acquisition of control of the Issuer by any person;
|
|
(h)
|
Causing a class of securities of the Issuer to be delisted from a national securities exchange
or to cease to be authorized to be quoted in an inter-dealer quotation system of a registered national securities association;
|
|
(i)
|
A class of equity securities of the Issuer becoming eligible for termination of registration pursuant
to Section 12(g)(4) of the Securities Exchange Act of 1934; or
|
|
(j)
|
Any action similar to any of those enumerated above.
|
CUSIP
No. 59045L106
|
13D
|
Page
12 of 19 Pages
|
Item
5. Interest in Securities of the Issuer.
|
(a)
|
NEA 14 is the record owner of the NEA 14 Shares. As the sole general
partner of NEA 14, NEA Partners 14 may be deemed to own beneficially the NEA 14 Shares. As the sole general partner of NEA Partners
14, NEA 14 LTD may be deemed to own beneficially the NEA 14 Shares. As members of NEA 14 LTD, each of the Directors may be deemed
to own beneficially the NEA 14 Shares.
|
Each Reporting Person disclaims beneficial
ownership of the NEA 14 Shares other than those shares which such person owns of record.
As of September 14, 2020, Florence
is the record owner of 3,210 shares of Common Stock (the “Florence Shares”). Accordingly, Florence may be deemed to
own beneficially the Florence Shares in addition to the NEA 14 Shares.
As of September 14, 2020, Kerins is
the record owner of 3,594 shares of Common Stock (the “Kerins Shares”). Accordingly, Kerins may be deemed to own beneficially
the Florence Shares in addition to the NEA 14 Shares.
As of September 14, 2020, Sonsini is
the record owner of 745 shares of Common Stock (the “Sonsini Shares”) and the Peter and Diane Sonsini Family Trust
dated January 17, 2007 (the “Sonsini Trust”) is the record owner of 596 shares of Common Stock (the “Sonsini
Trust Shares”). As trustee of the Sonsini Trust, Sonsini may be deemed to own beneficially the Sonsini Trust Shares in addition
to the Sonsini Shares and the NEA 14 Shares.
As of September 14, 2020, the Blue
Mountain Trust, dated April 29, 2019 (the “Blue Mountain Trust”) is the record owner of 829 shares of Common Stock
(the “Blue Mountain Trust Shares”), Genevieve P. Hardigg, as trustee of the Jennifer Ayer Sandell Rising River Trust,
dated December 20, 2012 (the “Jennifer Rising River Trust”) is the record owner of 138 shares of Common Stock (the
“Jennifer Rising River Trust Shares”) and Genevieve P. Hardigg, as trustee of the Scott Sandell Rising River Trust,
dated December 20, 2012 (the “Scott Rising River Trust”) is the record owner of 138 shares of Common Stock (the “Scott
Rising River Trust Shares”). Sandell may be deemed to own beneficially (i) the Blue Mountain Trust Shares as trustee of the
Blue Mountain Trust and (ii) the Jennifer Rising River Trust Shares and Scott Rising River Trust Shares as beneficial owner of
the Jennifer Rising River Trust and Scott Rising River Trust, in addition to the NEA 14 Shares.
As of September 14, 2020, the Baskett
Family Trust U/A DTD 10/12/2010 (the “Baskett Trust”) is the record owner of 1,602 shares of Common Stock (the “Baskett
Trust Shares”). As trustee of the Baskett Trust, Baskett may be deemed to own beneficially the Baskett Trust Shares in addition
to the NEA 14 Shares.
The percentage of outstanding Common Stock of the Issuer which
may be deemed to be beneficially owned by each Reporting Person is set forth on Line 13 of such Reporting Person’s cover
sheet. Such percentage was calculated based on the 68,415,100 shares of Common Stock reported to be outstanding as of August 4,
2020 on the Issuer’s Form 10-Q filed with the Securities and Exchange Commission on August 7, 2020.
|
(b)
|
Regarding
the number of shares as to which such person has:
|
|
(i)
|
sole
power to vote or to direct the vote: See line 7 of cover sheets
|
|
(ii)
|
shared
power to vote or to direct the vote: See line 8 of cover sheets
|
|
(iii)
|
sole
power to dispose or to direct the disposition: See line 9 of cover sheets
|
|
(iv)
|
shared
power to dispose or to direct the disposition: See line 10 of cover sheets
|
|
(c)
|
Except as set forth in Item 3 above, none of the Reporting Persons
has effected any transaction in the Common Stock during the last 60 days.
|
|
(d)
|
No other person is known to have the right to receive or the power
to direct the receipt of dividends from, or any proceeds from the sale of, Shares beneficially owned by any of the Reporting Persons.
|
CUSIP
No. 59045L106
|
13D
|
Page
13 of 19 Pages
|
Item
6. Contracts, Arrangements, Understandings or Relationships with Respect to Securities of the Issuer.
Not applicable.
Item
7. Material to Be Filed as Exhibits.
Exhibit
1 – Agreement regarding filing of joint Schedule 13D.
Exhibit
2 – Power of Attorney regarding filings under the Securities Exchange Act of 1934, as amended.
CUSIP
No. 59045L106
|
13D
|
Page
14 of 19 Pages
|
SIGNATURE
After
reasonable inquiry and to the best of its knowledge and belief, each of the undersigned certifies that the information set forth
in this statement is true, complete and correct.
EXECUTED
this 21st day of September, 2020.
NEW
ENTERPRISE ASSOCIATES 14, L.P.
|
By:
|
NEA
PARTNERS 14, L.P.
General
Partner
|
|
By:
|
NEA
14 GP, LTD
General
Partner
|
By: *
Scott
D. Sandell
Director
NEA
PARTNERS 14, L.P.
|
By:
|
NEA
14 GP, LTD
General Partner
|
By:
*
Scott
D. Sandell
Director
NEA
14 GP, LTD
By:
*
Scott
D. Sandell
Director
CUSIP
No. 59045L106
|
13D
|
Page
15 of 19 Pages
|
*
Forest
Baskett
*
Anthony
A. Florence, Jr.
*
Patrick
J. Kerins
*
Scott
D. Sandell
*
Peter
W. Sonsini
*/s/
Sasha O. Keough
Sasha
O. Keough
As
attorney-in-fact
This
Amendment No. 3 to Schedule 13D was executed by Sasha O. Keough on behalf of the individuals listed above pursuant to a Power
of Attorney a copy of which is attached as Exhibit 2.
CUSIP
No. 59045L106
|
13D
|
Page
16 of 19 Pages
|
EXHIBIT
1
AGREEMENT
Pursuant
to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, the undersigned hereby agree that only one statement containing
the information required by Schedule 13D need be filed with respect to the ownership by each of the undersigned of shares
of stock of Mersana Therapeutics, Inc.
EXECUTED
this 21st day of September, 2020.
NEW
ENTERPRISE ASSOCIATES 14, L.P.
|
By:
|
NEA
PARTNERS 14, L.P.
General
Partner
|
|
By:
|
NEA
14 GP, LTD
General
Partner
|
By: *
Scott
D. Sandell
Director
NEA
PARTNERS 14, L.P.
|
By:
|
NEA
14 GP, LTD
General Partner
|
By:
*
Scott
D. Sandell
Director
NEA
14 GP, LTD
By:
*
Scott
D. Sandell
Director
CUSIP
No. 59045L106
|
13D
|
Page
17 of 19 Pages
|
*
Forest
Baskett
*
Patrick
J. Kerins
*
Anthony
A. Florence, Jr.
*
Scott
D. Sandell
*
Peter
W. Sonsini
*/s/
Sasha O. Keough
Sasha
O. Keough
As
attorney-in-fact
This
Agreement relating to Schedule 13D was executed by Sasha O. Keough on behalf of the individuals listed above pursuant to
a Power of Attorney a copy of which is attached hereto as Exhibit 2.
CUSIP
No. 59045L106
|
13D
|
Page
18 of 19 Pages
|
EXHIBIT
2
POWER
OF ATTORNEY
KNOW
ALL MEN BY THESE PRESENTS, that the undersigned hereby constitutes and appoints Louis S. Citron, Timothy Schaller, Sasha Keough
and Stephanie Brecher, and each of them, with full power to act without the others, his or her true and lawful attorney-in-fact,
with full power of substitution, to sign any and all instruments, certificates and documents that may be necessary, desirable
or appropriate to be executed on behalf of himself as an individual or in his or her capacity as a direct or indirect general
partner, director, officer or manager of any partnership, corporation or limited liability company, pursuant to section 13
or 16 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), and any and all regulations promulgated
thereunder, and to file the same, with all exhibits thereto, and any other documents in connection therewith, with the Securities
and Exchange Commission, and with any other entity when and if such is mandated by the Exchange Act or by the Financial Industry
Regulatory Authority, granting unto said attorney-in-fact full power and authority to do and perform each and every act and thing
necessary, desirable or appropriate, fully to all intents and purposes as he or she might or could do in person, thereby ratifying
and confirming all that said attorney-in-fact, or his or her substitutes, may lawfully do or cause to be done by virtue hereof.
IN
WITNESS WHEREOF, this Power of Attorney has been signed as of the 13th day of March, 2017.
/s/
M. James Barrett
M.
James Barrett
/s/
Peter J. Barris
Peter
J. Barris
/s/
Forest Baskett
Forest
Baskett
/s/
Ali Behbahani
Ali
Behbahani
/s/
Colin Bryant
Colin
Bryant
/s/
Carmen Chang
Carmen
Chang
/s/
Anthony A. Florence, Jr.
Anthony
A. Florence, Jr.
/s/
Carol G. Gallagher
Carol
G. Gallagher
/s/
Dayna Grayson
Dayna
Grayson
/s/
Patrick J. Kerins
Patrick
J. Kerins
/s/
P. Justin Klein
P.
Justin Klein
CUSIP
No. 59045L106
|
13D
|
Page
19 of 19 Pages
|
/s/
Vanessa Larco
Vanessa
Larco
/s/
Joshua Makower
Joshua
Makower
/s/
Mohamad H. Makhzoumi
Mohamad
H. Makhzoumi
/s/
Edward T. Mathers
Edward
T. Mathers
/s/
David M. Mott
David
M. Mott
/s/
Sara M. Nayeem
Sara
M. Nayeem
/s/
Jason R. Nunn
Jason
R. Nunn
/s/
Gregory Papadopoulos
Gregory
Papadopoulos
/s/
Chetan Puttagunta
Chetan
Puttagunta
/s/
Jon Sakoda
Jon
Sakoda
/s/
Scott D. Sandell
Scott
D. Sandell
/s/
A. Brooke Seawell
A.
Brooke Seawell
/s/
Peter W. Sonsini
Peter
W. Sonsini
/s/
Melissa Taunton
Melissa
Taunton
/s/
Frank M. Torti
Frank
M. Torti
/s/
Ravi Viswanathan
Ravi
Viswanathan
/s/
Paul E. Walker
Paul
E. Walker
/s/
Rick Yang
Rick
Yang