Mersana Therapeutics Ownership

Who are the major shareholders and have insiders been buying or selling?

Recent Insider Transactions

Insider Trading Volume

Insider Buying: Insufficient data to determine if insiders have bought more shares than they have sold in the past 3 months.

Ownership Breakdown

What is the ownership structure of MRSN?
Owner Type	Number of Shares	Ownership Percentage
Individual Insiders	2,229,277	1.8%
General Public	4,252,027	3.44%
Hedge Funds	19,364,688	15.7%
VC/PE Firms	32,058,919	26%
Institutions	65,627,998	53.1%

Dilution of Shares: Shareholders have been diluted in the past year, with total shares outstanding growing by 2.4%.

Top Shareholders

Top 25 shareholders own 81.59% of the company

Ownership	Name	Shares	Current Value	Change %	Portfolio %
15.7%	EcoR1 Capital, LLC	19,364,688	US$39.5m	0%	1.33%
9.77%	Nextech Invest Ltd.	12,067,246	US$24.6m	26.7%	3.54%
9.17%	VR Adviser, LLC	11,328,000	US$23.1m	0%	1.09%
7.01%	Bain Capital Life Sciences Investors, LLC	8,663,673	US$17.7m	0%	1.78%
6.98%	BlackRock, Inc.	8,621,861	US$17.6m	2.84%	no data
5.81%	The Vanguard Group, Inc.	7,177,458	US$14.6m	7.09%	no data
3.57%	Citadel Advisors LLC	4,411,555	US$9.0m	60.8%	0.01%
2.47%	Rock Springs Capital Management LP	3,046,782	US$6.2m	0%	0.2%
2.21%	State Street Global Advisors, Inc.	2,725,394	US$5.6m	1.62%	no data
1.95%	Geode Capital Management, LLC	2,413,215	US$4.9m	-3.22%	no data
1.8%	Schonfeld Strategic Advisors LLC	2,223,308	US$4.5m	-25.3%	0.03%
1.56%	Goldman Sachs Group, Investment Banking and Securities Investments	1,924,284	US$3.9m	62.1%	no data
1.47%	Tavistock Life Sciences	1,817,000	US$3.7m	0%	0.23%
1.42%	Silverarc Capital Management, LLC	1,754,086	US$3.6m	10.6%	0.82%
1.29%	Deutsche Asset & Wealth Management	1,596,173	US$3.3m	1.28%	no data
1.1%	Morgan Stanley, Investment Banking and Brokerage Investments	1,355,169	US$2.8m	-40.1%	no data
1.06%	5AM Venture Management, LLC	1,305,000	US$2.7m	0%	0.54%
1.05%	Verition Fund Management LLC	1,303,249	US$2.7m	11,700%	0.02%
0.97%	Acuta Capital Partners, LLC	1,200,000	US$2.4m	-27.8%	2.06%
0.95%	Exome Asset Management LLC	1,178,570	US$2.4m	0%	1.63%
0.92%	JPMorgan Chase & Co, Brokerage and Securities Investments	1,131,126	US$2.3m	47.4%	no data
0.88%	JP Morgan Asset Management	1,086,983	US$2.2m	0.96%	no data
0.88%	Baker Bros. Advisors LP	1,086,115	US$2.2m	0%	0.02%
0.83%	D. E. Shaw & Co., L.P.	1,022,455	US$2.1m	-30.2%	no data
0.8%	Jacobs Levy Equity Management Inc	993,046	US$2.0m	105%	0.01%