Rock Springs Capital Management LP Mersana Therapeutics, Inc. Transaction History

Rock Springs Capital Management LP

$1.47 Billion
Q2 2025

A detailed history of Rock Springs Capital Management LP transactions in Mersana Therapeutics, Inc. stock. As of the latest transaction made, Rock Springs Capital Management LP holds 3,814,684 shares of MRSN stock, worth $23.2 Million. This represents 0.08% of its overall portfolio holdings.

Number of Shares

3,814,684

Previous 3,814,684 -0.0%

Holding current value

$23.2 Million

Previous $1.3 Million 11.73%

% of portfolio

0.08%

Previous 0.08%

20 transactions

Quarter	Operation	Price Per share	shares change	shares Held
Q1 2025 May 15, 2025	BUY	$0.34 - $1.4 $130,220 - $536,200	383,000 Added 11.16%	3,814,684 $1.3 Million
Q4 2024 Feb 14, 2025	BUY	$1.42 - $2.68 $546,560 - $1.03 Million	384,902 Added 12.63%	3,431,684 $4.91 Million
Q4 2023 Feb 14, 2024	SELL	$1.11 - $2.34 $395,549 - $833,861	-356,351 Reduced 10.47%	3,046,782 $7.07 Million
Q2 2023 Aug 14, 2023	SELL	$3.08 - $9.55 $2.16 Million - $6.69 Million	-700,670 Reduced 17.07%	3,403,133 $11.2 Million
Q4 2022 Feb 14, 2023	BUY	$5.65 - $7.86 $157,324 - $218,861	27,845 Added 0.68%	4,103,803 $24 Million
Q2 2022 Aug 15, 2022	BUY	$2.84 - $5.0 $909,191 - $1.6 Million	320,138 Added 8.52%	4,075,958 $18.8 Million
Q1 2022 May 16, 2022	BUY	$3.74 - $6.63 $1.9 Million - $3.36 Million	506,870 Added 15.6%	3,755,820 $15 Million
Q4 2021 Feb 14, 2022	BUY	$5.48 - $9.86 $1.25 Million - $2.25 Million	228,248 Added 7.56%	3,248,950 $20.2 Million
Q3 2021 Nov 15, 2021	BUY	$8.56 - $14.47 $1.5 Million - $2.53 Million	175,084 Added 6.15%	3,020,702 $28.5 Million
Q2 2021 Aug 16, 2021	BUY	$13.28 - $18.07 $936,120 - $1.27 Million	70,491 Added 2.54%	2,845,618 $38.6 Million
Q1 2021 May 17, 2021	BUY	$15.31 - $26.52 $10.9 Million - $18.9 Million	711,460 Added 34.48%	2,775,127 $44.9 Million
Q4 2020 Feb 16, 2021	BUY	$16.84 - $27.59 $3 Million - $4.92 Million	178,239 Added 9.45%	2,063,667 $54.9 Million
Q3 2020 Nov 16, 2020	BUY	$16.2 - $25.7 $113,400 - $179,900	7,000 Added 0.37%	1,885,428 $35.1 Million
Q2 2020 Aug 14, 2020	BUY	$5.24 - $23.4 $3.38 Million - $15.1 Million	645,428 Added 52.35%	1,878,428 $44 Million
Q4 2019 Feb 14, 2020	SELL	$1.45 - $6.73 $242,150 - $1.12 Million	-167,000 Reduced 11.93%	1,233,000 $7.07 Million
Q1 2019 May 15, 2019	BUY	$3.51 - $7.3 $1.4 Million - $2.92 Million	400,000 Added 40.0%	1,400,000 $7.36 Million
Q2 2018 Aug 14, 2018	SELL	$14.2 - $22.68 $4.26 Million - $6.8 Million	-300,000 Reduced 23.08%	1,000,000 $17.9 Million
Q1 2018 May 15, 2018	SELL	$13.56 - $18.48 $363,408 - $495,264	-26,800 Reduced 2.02%	1,300,000 $20.5 Million
Q4 2017 Feb 14, 2018	SELL	$14.95 - $19.9 $47,840 - $63,679	-3,200 Reduced 0.24%	1,326,800 $21.8 Million
Q3 2017 Nov 14, 2017	BUY	$14.8 - $18.06 $19.7 Million - $24 Million	1,330,000	1,330,000 $23 Million

Others Institutions Holding MRSN

# of Institutions

Shares Held

95.3M

Call Options Held

34.3K

Put Options Held

14K

View Full List

About Mersana Therapeutics, Inc.

Ticker MRSN
Exchange NASDAQ
Sector Healthcare
Industry Biotechnology
Shares Outstandng 97,169,296
Market Cap $590M
Description
Mersana Therapeutics, Inc., a clinical stage biopharmaceutical company, develops antibody drug conjugates (ADC) for cancer patients with unmet need. It develops XMT-1592, a Dolasynthen ADC targeting NaPi2b-expressing tumor cells, which is in phase I clinical trial for the treatment of ovarian cancer and NSCLC adenocarcinoma. The company also dev...

More about MRSN

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Rock Springs Capital Management LP Mersana Therapeutics, Inc. Transaction History