Schonfeld Strategic Advisors LLC

13F Holdings History for Mersana Therapeutics, Inc. - Common Stock, par value $0.0001 per share (MRSN)

Symbol: MRSN on Nasdaq
Investment type: Equity / Common Stock, par value $0.0001 per share
Latest Disclosed Ownership: 274K shares
Security Ownership: 5.48%

Shares, Excluding Options vs Price

Value, Excluding Options

Schonfeld Strategic Advisors LLC ownership in Mersana Therapeutics, Inc. Common Stock, par value $0.0001 per share (MRSN)

2025-11-14 - Schonfeld Strategic Advisors LLC has filed an SCHEDULE 13G form with the Securities and Exchange Commission (SEC) disclosing ownership of 274K shares of Mersana Therapeutics, Inc. Common Stock, par value $0.0001 per share (MRSN). This represents 5.48% percent ownership of the company. In their previous filing dated 2025-08-14, Schonfeld Strategic Advisors LLC had reported owning 5.67M shares, indicating a decrease of -95.2% percent.

Reporting Name	Ownership %	Change	Value $	Shares owned	Change	Activity %	Price	Form	Report date	Filed at
Schonfeld Strategic Advisors LLC	5.48%	+18.6%	$2.12M	274K	-5,400,273	-95.2%	$7.76	13G	9/30/2025	14 Nov 2025 16:15:33
Schonfeld Strategic Advisors LLC	4.55%	-26%	$1.76M	5.67M	-1,940,213	-25.5%	$0.31	13G/A	6/30/2025	14 Aug 2025 16:31:35
Schonfeld Strategic Advisors LLC	6.11%		$2.28M	7.61M			$0.30	13G	3/31/2025	15 May 2025 16:31:50

Holdings date	Option	Weight	Change	Value $	Shares	Change	Activity %	Price	All Holders
9/30/2025			-0.01%	$0	0	-5,673,852	-100%		Q3 2025
6/30/2025		0.01%	0%	$1.68M	5.67M	-1,940,212	-25.5%	$0.30	Q2 2025
3/31/2025		0.02%	+0.01%	$2.62M	7.61M	+5,494,478	+200%	$0.34	Q1 2025
12/31/2024		0.02%	0%	$3.03M	2.12M	-103,722	-4.67%	$1.43	Q4 2024
9/30/2024		0.03%	-0.01%	$4.2M	2.22M	-753,610	-25.3%	$1.89	Q3 2024
6/30/2024		0.05%	+0.03%	$5.98M	2.98M	+1,968,260	+195%	$2.01	Q2 2024
3/31/2024		0.04%	0%	$4.52M	1.01M	-130,749	-11.5%	$4.48	Q1 2024
12/31/2023		0.02%	+0.02%	$2.64M	1.14M	+1,139,407	NEW	$2.32	Q4 2023
9/30/2023			-0.01%	$0	0	-320,540	-100%		Q3 2023
9/30/2023	call		0%	$0	0	-50,000	-100%	^*	Q3 2023
6/30/2023		0.01%	+0.01%	$1.05M	321K	+320,540	NEW	$3.29	Q2 2023
6/30/2023	call	0%	+0%	$9.5K	50K	+50,000	NEW	$0.19^*	Q2 2023
12/31/2022			0%	$0	0	-86,151	-100%		Q4 2022
9/30/2022		0%	+0%	$583K	86.2K	+86,151	NEW	$6.77	Q3 2022
6/30/2022			0%	$0	0	-52,900	-100%		Q2 2022
3/31/2022		0%	+0%	$211K	52.9K	+52,900	NEW	$3.99	Q1 2022
9/30/2021			0%	$0	0	-22,500	-100%		Q3 2021
6/30/2021		0%	0%	$306K	22.5K	-23,402	-51%	$13.60	Q2 2021
3/31/2021		0.01%	-0.02%	$743K	45.9K	-107,435	-70.1%	$16.19	Q1 2021
12/31/2020		0.05%	+0.02%	$4.08M	153K	+60,692	+65.5%	$26.61	Q4 2020
9/30/2020		0.03%	+0.02%	$1.73M	92.6K	+43,208	+87.4%	$18.62	Q3 2020
6/30/2020		0.03%	+0.01%	$1.16M	49.4K	+8,930	+22%	$23.40	Q2 2020
3/31/2020		0.01%	+0.01%	$236K	40.5K	+30,007	+286%	$5.83	Q1 2020
12/31/2019		0%	+0%	$60K	10.5K	+10,500	NEW	$5.71	Q4 2019
6/30/2018			-0.01%	$0	0	-10,447	-100%		Q2 2018
3/31/2018		0.01%	+0.01%	$165K	10.4K	+10,447	NEW	$15.79	Q1 2018
9/30/2017			-0.05%	$0	0	-35,000	-100%		Q3 2017
6/30/2017		0.05%	+0.05%	$489K	35K	+35,000	NEW	$13.97	Q2 2017

* Reported Price is the price of the security as of the portfolio date. This value is significant in that it is the last known price at which the security was still held.
An asterisk sign (*) next to the price indicates that the price is likely invalid.