Mersana Therapeutics Inc

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Mersana Therapeutics Inc
TickerMRSN
CIK #0001442836
CUSIP59045L106
SectorLife Sciences - Pharmaceutical Preparations
Address840 Memorial Drive, Cambridge, MA 02139
Source [EDGAR]
CIK Filing 2011 - 2025
[0001442836] 10-K
[0001442836] 10-Q
[0001442836] 3
[0001442836] 4
[0001442836] 8-K
[0001442836] D
[0001442836] SC 13D
[0001442836] SC 13G
Form 13D/13G Filer Form 13D/13G Subject Filed % Owned
Schonfeld Strategic Advisors LLC Mersana Therapeutics Inc [2025-05-15] 0.0
Nextech Crossover I GP Sa RL Mersana Therapeutics Inc [2024-05-17] 5.1
SilverArc Capital Management LLC Mersana Therapeutics Inc [2024-02-14] 5.3
Balyasny Asset Management LP Mersana Therapeutics Inc [2024-02-14] 81948.04
Vanguard Group Inc Mersana Therapeutics Inc [2024-02-13] 5.17
Venrock Healthcare Capital Partners III LP Mersana Therapeutics Inc [2023-08-07] 8.5
EcoR1 Capital LLC Mersana Therapeutics Inc [2023-07-27] 16.9
OrbiMed Advisors LLC Mersana Therapeutics Inc [2023-02-14] 7.1
Millennium Management LLC Mersana Therapeutics Inc [2022-02-17] 5.2
State Street Corp Mersana Therapeutics Inc [2022-02-11] 5.87
Vanguard Group Inc Mersana Therapeutics Inc [2022-02-10] 5.02
BlackRock Inc Mersana Therapeutics Inc [2022-01-27] 10.4
BB Biotech AG Mersana Therapeutics Inc [2021-09-16] 5.8
Avoro Capital Advisors LLC Mersana Therapeutics Inc [2021-02-12] 0.9
Wellington Management Group LLP Mersana Therapeutics Inc [2021-02-04] 6.79
Sarissa Capital Management LP Mersana Therapeutics Inc [2021-01-25] 5.5
Bain Capital Life Sciences Fund II LP Mersana Therapeutics Inc [2020-04-17] 5.2
BlackRock Inc Mersana Therapeutics Inc [2020-02-07] 5.1
Venrock Healthcare Capital Partners II LP Mersana Therapeutics Inc [2019-12-23] 5.2
Sarissa Capital Management LP Mersana Therapeutics Inc [2019-03-11] 7.9
Biotechnology Value Fund L P Mersana Therapeutics Inc [2019-03-11] 2.5
ArrowMark Colorado Holdings LLC Mersana Therapeutics Inc [2019-02-14] 8.75
Rho Ventures V LP Mersana Therapeutics Inc [2018-02-09] 3.6
Wellington Management Group LLP Mersana Therapeutics Inc [2017-08-10] 10.46
Pfizer Inc Mersana Therapeutics Inc [2017-07-13] 9.0
New Enterprise Associates 14 LP Mersana Therapeutics Inc [2017-07-11] 36.0
Rock Springs Capital Management LP Mersana Therapeutics Inc [2017-07-07] 6.8
FMR LLC Mersana Therapeutics Inc [2017-07-06] 0.0
Form 3/4/5 Filer 2011 - 2025
Mott David M
Mersana Therapeutics, Inc.
Hack Andrew A. F.
Alleva Lawrence M
Dere Willard H
Diaz Allene M.
Protopapas Anna
Hege Kristen
DeSchuytner Brian
Mandelia Ashish
Bala Mohan
Carvajal Alejandra
Lowinger Timothy B
Huber Martin H. Jr.
Nextech Crossover I SCSP
Sgobbo Rocco
Nextech Crossover I GP S.a r.l.
Constantinides Costas
Charoub Ian
EcoR1 Capital, LLC
Misra Tushar
Yang Arvin
Kaufman Michael J.
Sonsini Peter W.
Jack Eva M.
Florence Anthony A. Jr.
New Enterprise Associates 14, L.P.
NEA Partners 14, L.P.
NEA 14 GP Ltd
Sandell Scott D
Baskett Forest
Kerins Patrick J
Huebner Dirk
Barris Peter J
Foster Wayne
Spellman David A
Bergstrom Donald A
Nayeem Sara M.
Viswanathan Ravi
FMR LLC
Barrett M James
Jones Elaine V
Form 13F Holdings
Firm Period DFND Voting Shares
Nextech Invest Ltd [2025-06-30] SOLE 12,067,246 12,067,246
Bain Capital Life Sciences Investors, LLC [2025-06-30] SOLE 8,663,673 8,663,673
Vanguard Group Inc [2025-06-30] SOLE 0 7,643,667
Schonfeld Strategic Advisors LLC [2025-06-30] SOLE 5,673,852 5,673,852
AQR Capital Management LLC [2025-06-30] DFND 4,898,749 5,032,685
Rock Springs Capital Management LP [2025-06-30] SOLE 3,814,684 3,814,684
BlackRock, Inc. [2025-06-30] SOLE 3,739,717 3,763,419
SilverArc Capital Management LLC [2025-06-30] SOLE 3,128,421 3,128,421
Acadian Asset Management LLC [2025-06-30] DFND 2,955,280 2,955,280
Renaissance Technologies LLC [2025-06-30] SOLE 2,850,194 2,850,194
Millennium Management LLC [2025-06-30] SOLE 2,090,235 2,090,235
683 Capital Management LLC [2025-06-30] DFND 1,990,000 1,990,000
Catalio Capital Management LP [2025-06-30] SOLE 1,567,413 1,567,413
Goldman Sachs Group Inc [2025-06-30] DFND 1,433,760 1,433,760
Jacobs Levy Equity Management Inc [2025-06-30] SOLE 1,332,945 1,332,945
5AM Venture Management LLC [2025-06-30] SOLE 1,305,000 1,305,000
Geode Capital Management LLC [2025-06-30] DFND 1,049,205 1,049,205
Luminus Management LLC [2025-06-30] SOLE 1,039,314 1,039,314
Two Sigma Advisers LP [2025-06-30] SOLE 890,600 937,000
Two Sigma Investments LP [2025-06-30] SOLE 823,269 823,269
UBS Group AG [2025-06-30] DFND 770,501 775,501
Lion Point Capital LP [2025-06-30] SOLE 644,000 644,000
IEQ Capital LLC [2025-06-30] OTR 32,987 638,452
Alamea Verwaltungs GmbH [2025-06-30] SOLE 604,213 604,213
Jane Street Group LLC [2025-06-30] DFND 511,182 511,182
GSA Capital Partners LLP [2025-06-30] SOLE 471,681 471,681
State Street Corp [2025-06-30] DFND 446,110 452,110
Susquehanna International Group LLP [2025-06-30] OTR 449,369 449,369
Morgan Stanley [2025-06-30] DFND 351,597 357,597
Cerity Partners LLC [2025-06-30] SOLE 23,529 320,805
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