MRSN 13F Hedge Fund and Asset Management Owners

Data as of 2021-05-08 11:50:41 -0400
Market Cap	1.065 Billion	Shares Outstanding	69.051 Million	Avg 30-day Volume	533.048 Thousand
P/E Ratio		Dividend Yield		EPS
Price/Sales		Debt to Equity		EBITDA
Price to Book Value	0.0	Forward PE	-9.39	Enterprise Value
Total Cash		Current Debt		Gross Profit
BETA	1.74883	52-week High/Low	29.09 / 9.0	Next Earnings Date		Price to Cash FLow (P/CF)	-9999999.0
				Data provided by IEX Cloud

Q4 2020	All 13F Filers	Prior	Change	Hedge Funds ¹	Prior	Change
In top 10:	6	8	-25.0%	4 (0.24%)	6 (0.37%)	-33.33%
Funds Holding:	153	137	11.68%	54 (3.24%)	54 (3.36%)	0.0%
13F shares:	68.942 Million	68.691 Million	0.36%	33.338 Million	32.836 Million	1.53%
% Ownership				48.6703	47.9371	1.53%
New Positions:	35	25	40.0%	11	13	-15.38%
Increased Positions	54	55	-1.82%	20	15	33.33%
Closed Positions	19	21	-9.52%	11	16	-31.25%
Reduced Positions	45	38	18.42%	16	21	-23.81%
Total Calls	482.118 Thousand	501.963 Thousand	-3.95%	196.1 Thousand	331.1 Thousand	-40.77%
Total Puts	215.785 Thousand	159.922 Thousand	34.93%	154.4 Thousand	25.4 Thousand	507.87%
PUT/CALL Ratio	0.45	0.32	40.63%	0.79	0.08	887.5%
¹ hedge funds and active managers as identified by whalewisdom.com through public filings.

Funds Holding MRSN (via 13F filings)

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Market Value:

Ranking:

% of portfolio

*Shares are split adjusted
*Please note that if a filer hasn't submitted a 13F filing for a quarter then the filer's shares will be listed as "Sold All"

Mutual Funds Holding MRSN BETA

Active Schedule 13D and 13G filings

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Open Market Buys/Sells Last 60 Days

Open Market Buys (P)

none

Open Market Sells (S)

12.3 Thousand total shares from 6 transactions

Exercise Derivative Conversion (M)

12.3 Thousand total shares from 6 transactions

Current/Former Insiders

Insider Name	Type	Last Reported Shares Held	Last Reported Date	Filings in past year
CARVAJAL ALEJANDRA CHIEF LEGAL OFFICER	Officer	137,500	2021-04-26	2
LOWINGER TIMOTHY B CHIEF SCIENCE & TECH. OFFICER	Officer	131,593	2021-04-20	10
DIAZ ALLENE M.	Director	0	2021-03-09	2
KAUFMAN MICHAEL J. SR VP, CHEMISTRY, MAN.&CONTROL	Officer	4,710	2021-01-15	1
PROTOPAPAS ANNA PRESIDENT & CEO	Officer Director	224,922	2021-01-15	1
HACK ANDREW A. F.	Director	0	2021-01-15	3
HEGE KRISTEN	Director	0	2021-01-15	2
MOTT DAVID M	Director	0	2021-01-15	5
ALLEVA LAWRENCE M	Director	0	2021-01-15	3
DERE WILLARD H	Director	0	2021-01-15	2
DESCHUYTNER BRIAN SR. VP., FIN, PRODUCT STRATEGY	Officer	6,423	2021-01-15	1
MANDELIA ASHISH VP, CONTROLLER	Officer	0	2021-01-15	3
HUBER MARTIN H. JR.	Director	0	2021-01-15	1
YANG ARVIN CHIEF MEDICAL OFFICER	Officer	0	2020-11-30	2
JACK EVA M. CHIEF BUS. OFFICER, TRES, SEC.	Officer	0	2020-09-14	1
FLORENCE ANTHONY A. JR.	10% Owner	5,972,990	2020-09-14	1
BASKETT FOREST	10% Owner	5,971,382	2020-09-14	1
SANDELL SCOTT D	10% Owner	5,970,885	2020-09-14	1
KERINS PATRICK J	10% Owner	5,963,114	2020-09-14	1
SONSINI PETER W.	10% Owner	5,960,861	2020-09-14	1
NEW ENTERPRISE ASSOCIATES 14, L.P.	10% Owner	5,959,520	2020-09-14	1
NEA PARTNERS 14, L.P. NEA 14 GP, LTD	10% Owner	5,959,520	2020-09-14	1
HUEBNER DIRK CHIEF MEDICAL OFFICER	Officer	0	2020-01-15	0
NEW ENTERPRISE ASSOCIATES 14, L.P. SONSINI PETER W. BASKETT FOREST FLORENCE ANTHONY A. JR. KERINS PATRICK J NEA 14 GP, LTD NEA PARTNERS 14, L.P. SANDELL SCOTT D	10% Owner	11,959,520	2019-08-28	1
NEW ENTERPRISE ASSOCIATES 14, L.P. SONSINI PETER W. NEA 14 GP, LTD NEA PARTNERS 14, L.P. BARRIS PETER J BASKETT FOREST FLORENCE ANTHONY A. JR. KERINS PATRICK J SANDELL SCOTT D	10% Owner	11,890,138	2019-03-05	1
FOSTER WAYNE VICE PRESIDENT OF FINANCE	Officer	0	2019-01-23	0
SPELLMAN DAVID A CHIEF FINANCIAL OFFICER	Officer	0	2019-01-23	0
BERGSTROM DONALD A CHIEF MEDICAL OFFICER	Officer	0	2018-02-02	0
NAYEEM SARA M.	Director	0	2018-01-02	0
NEW ENTERPRISE ASSOCIATES 14, L.P. NEA PARTNERS 14, L.P. NEA 14 GP, LTD	10% Owner	8,140,138	2017-07-03	0
BARRIS PETER J	10% Owner	8,140,138	2017-07-03	0
BARRETT M JAMES	10% Owner	8,140,138	2017-07-03	0
VISWANATHAN RAVI	10% Owner	8,140,138	2017-07-03	0
FMR LLC	SEE REMARK 1	No longer subject to file	2017-07-03	0
JONES ELAINE V	Director	0	2017-06-27	0

Insider Transactions Last 60 Days

Reporting Owners	Filing Date	Trans Date	Trans Code	Shares	Share Price	Acquired Disposed	Shares Owned after	D/I	10b5	Perf 1d*	Perf 5d*	Perf 1m*	Max Gain	Max Gain Days	Max Loss	Max Loss Days
CARVAJAL ALEJANDRA - Officer CHIEF LEGAL OFFICER	2021-04-28 16:32:45 -0400	2021-04-26	A	26,500		a	25,000	direct
CARVAJAL ALEJANDRA - Officer CHIEF LEGAL OFFICER	2021-04-28 16:32:45 -0400	2021-04-26	A	112,500		a	112,500	direct
LOWINGER TIMOTHY B - Officer CHIEF SCIENCE & TECH. OFFICER	2021-04-22 16:16:59 -0400	2021-04-20	M	2,227		d	86,092	direct	yes
LOWINGER TIMOTHY B - Officer CHIEF SCIENCE & TECH. OFFICER	2021-04-22 16:16:59 -0400	2021-04-20	M	2,227	$6.16	a	33,671	direct	yes	5.9925	-0.5618		5.9925	2	-0.5618	6
LOWINGER TIMOTHY B - Officer CHIEF SCIENCE & TECH. OFFICER	2021-04-22 16:16:59 -0400	2021-04-20	M	1,875		d	14,057	direct	yes
LOWINGER TIMOTHY B - Officer CHIEF SCIENCE & TECH. OFFICER	2021-04-22 16:16:59 -0400	2021-04-20	S	1,875	$15.91	d	31,444	direct	yes	5.9925	-0.5618		5.9925	2	-0.5618	6
LOWINGER TIMOTHY B - Officer CHIEF SCIENCE & TECH. OFFICER	2021-04-22 16:16:59 -0400	2021-04-20	S	2,227	$15.91	d	31,444	direct	yes	5.9925	-0.5618		5.9925	2	-0.5618	6
LOWINGER TIMOTHY B - Officer CHIEF SCIENCE & TECH. OFFICER	2021-04-22 16:16:59 -0400	2021-04-20	M	1,875	$3.51	a	33,319	direct	yes	5.9925	-0.5618		5.9925	2	-0.5618	6
LOWINGER TIMOTHY B - Officer CHIEF SCIENCE & TECH. OFFICER	2021-03-24 17:00:56 -0400	2021-03-22	M	1,874	$3.51	a	33,318	direct	yes	-2.0612	2.8857	-9.1873	6.4193	7	-12.1908	30
LOWINGER TIMOTHY B - Officer CHIEF SCIENCE & TECH. OFFICER	2021-03-24 17:00:56 -0400	2021-03-22	M	2,227		d	88,319	direct	yes
LOWINGER TIMOTHY B - Officer CHIEF SCIENCE & TECH. OFFICER	2021-03-24 17:00:56 -0400	2021-03-22	M	1,874		d	17,807	direct	yes
LOWINGER TIMOTHY B - Officer CHIEF SCIENCE & TECH. OFFICER	2021-03-24 17:00:56 -0400	2021-03-22	S	1,875	$17.50	d	31,444	direct	yes	-2.0612	2.8857	-9.1873	6.4193	7	-12.1908	30
LOWINGER TIMOTHY B - Officer CHIEF SCIENCE & TECH. OFFICER	2021-03-24 17:00:56 -0400	2021-03-22	M	2,227	$6.16	a	33,671	direct	yes	-2.0612	2.8857	-9.1873	6.4193	7	-12.1908	30
LOWINGER TIMOTHY B - Officer CHIEF SCIENCE & TECH. OFFICER	2021-03-24 17:00:56 -0400	2021-03-22	M	1,875		d	15,932	direct	yes
LOWINGER TIMOTHY B - Officer CHIEF SCIENCE & TECH. OFFICER	2021-03-24 17:00:56 -0400	2021-03-22	S	2,227	$17.50	d	31,444	direct	yes	-2.0612	2.8857	-9.1873	6.4193	7	-12.1908	30
LOWINGER TIMOTHY B - Officer CHIEF SCIENCE & TECH. OFFICER	2021-03-24 17:00:56 -0400	2021-03-22	M	1,875	$3.51	a	33,319	direct	yes	-2.0612	2.8857	-9.1873	6.4193	7	-12.1908	30
LOWINGER TIMOTHY B - Officer CHIEF SCIENCE & TECH. OFFICER	2021-03-24 17:00:56 -0400	2021-03-22	S	1,874	$17.50	d	31,444	direct	yes	-2.0612	2.8857	-9.1873	6.4193	7	-12.1908	30
LOWINGER TIMOTHY B - Officer CHIEF SCIENCE & TECH. OFFICER	2021-03-24 17:00:56 -0400	2021-03-22	M	2,227		d	90,546	direct	yes
LOWINGER TIMOTHY B - Officer CHIEF SCIENCE & TECH. OFFICER	2021-03-24 17:00:56 -0400	2021-03-22	M	2,227	$6.16	a	33,671	direct	yes	-2.0612	2.8857	-9.1873	6.4193	7	-12.1908	30
LOWINGER TIMOTHY B - Officer CHIEF SCIENCE & TECH. OFFICER	2021-03-24 17:00:56 -0400	2021-03-22	S	2,227	$17.50	d	31,444	direct	yes	-2.0612	2.8857	-9.1873	6.4193	7	-12.1908	30

* -

Transaction Code Definitions
Code	Definition
A	Grant, award or other acquisition pursuant to Rule 16b-3(d)
C	Conversion of derivative security
D	Disposition to the issuer of issuer equity securities pursuant to Rule 16b-3(e)
E	Expiration of short derivative position
F	Payment of exercise price or tax liability by delivering or withholding securities incident to the receipt, exercise or vesting of a security issued in accordance with Rule 16b-3
G	Bona fide gift
H	Expiration (or cancellation) of long derivative position with value received
I	Discretionary transaction in accordance with Rule 16b-3(f) resulting in acquisition or disposition of issuer securities
J	Other acquisition or disposition
L	Small acquisition under Rule 16a-6
M	Exercise or conversion of derivative security exempted pursuant to Rule 16b-3
O	Exercise of out-of-the-money derivative security
P	Open market or private purchase of non-derivative or derivative security
S	Open market or private sale of non-derivative or derivative security
U	Disposition pursuant to a tender of shares in a change of control transaction
W	Acquisition or disposition by will or the laws of descent and distribution
X	Exercise of in-the-money or at-the-money derivative security
Z	Deposit into or withdrawal from voting trust

IBR Securities Loan Availability

Updated throughout the day, this shows the number of shares available to borrow. Data provided by Interactive Brokers

Security	Date/Time	Rebate Rate	Fee Rate	Shares Available
MERSANA THERAPEUTICS INC MRSN	2021-05-10 22:15:04 UTC	-0.5164	0.5664	950000
MERSANA THERAPEUTICS INC MRSN	2021-05-10 21:45:02 UTC	-0.5164	0.5664	950000
MERSANA THERAPEUTICS INC MRSN	2021-05-10 21:15:02 UTC	-0.5164	0.5664	950000
MERSANA THERAPEUTICS INC MRSN	2021-05-10 20:45:03 UTC	-0.5164	0.5664	950000
MERSANA THERAPEUTICS INC MRSN	2021-05-10 20:15:03 UTC	-0.5164	0.5664	950000
MERSANA THERAPEUTICS INC MRSN	2021-05-10 19:45:03 UTC	-0.5164	0.5664	950000
MERSANA THERAPEUTICS INC MRSN	2021-05-10 19:15:03 UTC	-0.5164	0.5664	950000
MERSANA THERAPEUTICS INC MRSN	2021-05-10 18:45:03 UTC	-0.2769	0.3269	950000
MERSANA THERAPEUTICS INC MRSN	2021-05-10 18:15:03 UTC	-0.2769	0.3269	950000
MERSANA THERAPEUTICS INC MRSN	2021-05-10 17:45:02 UTC	-0.2769	0.3269	950000
MERSANA THERAPEUTICS INC MRSN	2021-05-10 17:15:03 UTC	-0.2769	0.3269	950000
MERSANA THERAPEUTICS INC MRSN	2021-05-10 16:45:03 UTC	-0.2769	0.3269	950000
MERSANA THERAPEUTICS INC MRSN	2021-05-10 16:15:03 UTC	-0.2769	0.3269	950000
MERSANA THERAPEUTICS INC MRSN	2021-05-10 15:45:03 UTC	-0.2769	0.3269	850000
MERSANA THERAPEUTICS INC MRSN	2021-05-10 15:15:03 UTC	-0.2769	0.3269	850000
MERSANA THERAPEUTICS INC MRSN	2021-05-10 14:45:04 UTC	-0.286	0.336	850000
MERSANA THERAPEUTICS INC MRSN	2021-05-10 14:15:04 UTC	-0.286	0.336	850000
MERSANA THERAPEUTICS INC MRSN	2021-05-10 13:45:04 UTC	-0.286	0.336	850000
MERSANA THERAPEUTICS INC MRSN	2021-05-10 13:15:03 UTC	-0.286	0.336	850000
MERSANA THERAPEUTICS INC MRSN	2021-05-10 12:45:02 UTC	-0.286	0.336	850000

Current Active Short Positions

Holder	Issuer	Net Short Position	Position Date	Origin
RUSSELL INVESTMENT CO- U.S. Small Cap Equity Fund	MRSN	-3573.0 shares, $-64385.46	2020-10-31	N-PORT
RUSSELL INVESTMENT FUNDS- U.S. Small Cap Equity Fund	MRSN	-500.0 shares, $-13305.0	2020-12-31	N-PORT

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