Mersana Therapeutics, Inc. - Common Stock, $0.0001 par value per share (MRSN)

Historical Holders from Q2 2025 to Q3 2025

Type / Class
Equity / Common Stock, $0.0001 par value per share
Symbol
MRSN on Nasdaq
Shares outstanding
4,998,537
Price per share
$28.14
All holders as of 30 Sep 2025
Q3 2025
Total 13F shares
3,128,210
Total reported value
$24,272,592
% of total 13F portfolios
0%
Share change
+2,899,340
Value change
+$24,189,774
Number of holders
45
Reported Shares, Excluding Options vs Price
Reported Value, Excluding Options
Total Investors

Significant Owners of Mersana Therapeutics, Inc. - Common Stock, $0.0001 par value per share (MRSN) based on Schedule 13D/G filings

Filer Ownership Change % Holdings Value Net Change Nb Shares Change % Reporting Name Report Period
683 Capital Management, LLC 5.5% $2,542,806 273,420 683 Capital Management, LLC 17 Nov 2025
As of 30 Sep 2025, Mersana Therapeutics, Inc. - Common Stock, $0.0001 par value per share (MRSN) has 45 institutional shareholders filing 13F forms. They hold 3,128,210 shares. of 4,998,537 outstanding shares (63%) .

Top 25 institutional shareholders own 62% of the company.

Filer Ownership Nb Shares Share Change % Portfolio % Holdings Value
Nextech Invest, Ltd. 9.7% 482,689 0.57% $3,745,667
Alamea Verwaltungs GmbH 8.6% 430,025 2.3% $3,336,994
Bain Capital Life Sciences Investors, LLC 6.9% 346,545 0.18% $2,689,189
VANGUARD GROUP INC 6.1% 302,553 0% $2,347,812
Schonfeld Strategic Advisors LLC 5.5% 273,579 0.01% $2,122,970
Rock Springs Capital Management LP 3.1% 152,586 0.07% $1,184,067
ACADIAN ASSET MANAGEMENT LLC 2.8% 142,360 0% $1,103,000
SILVERARC CAPITAL MANAGEMENT, LLC 2.7% 133,636 0.15% $1,037,015
683 Capital Management, LLC 2% 100,000 0.07% $776,000
BlackRock, Inc. 1.9% 96,193 0% $746,458
RENAISSANCE TECHNOLOGIES LLC 1.8% 88,465 0% $686,488
MILLENNIUM MANAGEMENT LLC 1.6% 77,989 0% $605,195
BANK OF AMERICA CORP /DE/ 1.3% 66,397 0% $515,241
5AM Venture Management, LLC 1% 52,200 0.15% $405,072
MORGAN STANLEY 0.97% 48,327 0% $375,017
MACKENZIE FINANCIAL CORP 0.96% 47,819 0% $371,075
AQR CAPITAL MANAGEMENT LLC 0.93% 46,720 0% $362,547
GEODE CAPITAL MANAGEMENT, LLC 0.83% 41,648 0% $323,291
TWO SIGMA ADVISERS, LP 0.81% 40,640 0% $315,366
TWO SIGMA INVESTMENTS, LP 0.61% 30,688 0% $238,139
STATE STREET CORP 0.6% 29,843 0% $231,582
Lion Point Capital, LP 0.52% 25,760 1.1% $199,898
IEQ CAPITAL, LLC 0.3% 15,240 0% $118,262
DRW Securities, LLC 0.28% 13,851 0.01% $107,483
Voleon Capital Management LP 0.26% 13,200 0% $102,432

Institutional Holders of Mersana Therapeutics, Inc. - Common Stock, $0.0001 par value per share (MRSN) across Reporting Periods

Period Reported Shares, Excl. Options Value, Excl. Options Value Change Price Investors
2025 Q3 3,128,210 $24,272,592 +$24,189,774 $7.76 45
2025 Q2 228,339 $68,496 +$68,496 $0.30 2