Vanguard Group Inc

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: 8.38M shares
Security Ownership: 6.72%

Shares, Excluding Options vs Price

Value, Excluding Options

The Vanguard Group ownership in Mersana Therapeutics, Inc. Common Stock, par value $0.0001 per share (MRSN)

2025-04-30 - The Vanguard Group has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 8.38M shares of Mersana Therapeutics, Inc. Common Stock, par value $0.0001 per share (MRSN). This represents 6.72% percent ownership of the company.

Reporting Name	Ownership %	Change	Value $	Shares owned	Change	Activity %	Price	Form	Report date	Filed at
The Vanguard Group	6.72%		$2.51M	8.38M			$0.30	13G/A	3/31/2025	30 Apr 2025 11:23:39

Holdings date	Weight	Change	Value $	Shares	Change	Activity %	Price	All Holders
9/30/2025		0%	$0	0	-7,678,391	-100%		Q3 2025
6/30/2025	0%	0%	$2.27M	7.68M	-699,376	-8.35%	$0.30	Q2 2025
3/31/2025	0%	+0%	$2.88M	8.38M	+1,320,251		$0.34	Q1 2025
12/31/2024	0%	0%	$10.1M	7.06M	-119,942	-1.67%	$1.43	Q4 2024
9/30/2024	0%	+0%	$13.6M	7.18M	+474,937	+7.09%	$1.89	Q3 2024
6/30/2024	0%	+0%	$13.5M	6.7M	+428,151	+6.82%	$2.01	Q2 2024
3/31/2024	0%	+0%	$28.1M	6.27M	+36,782	+0.59%	$4.48	Q1 2024
12/31/2023	0%	+0%	$14.5M	6.24M	+51,465	+0.83%	$2.32	Q4 2023
9/30/2023	0%	+0%	$7.86M	6.19M	+461,504	+8.06%	$1.27	Q3 2023
6/30/2023	0%	+0%	$18.8M	5.72M	+1,086,127	+23.4%	$3.29	Q2 2023
3/31/2023	0%	+0%	$19.1M	4.64M	+189,452	+4.26%	$4.11	Q1 2023
12/31/2022	0%	+0%	$26.1M	4.45M	+71,041	+1.62%	$5.86	Q4 2022
9/30/2022	0%	0%	$29.6M	4.38M	-355,732	-7.51%	$6.76	Q3 2022
6/30/2022	0%	+0%	$21.9M	4.73M	+1,298,461	+37.8%	$4.62	Q2 2022
3/31/2022	0%	0%	$13.7M	3.44M	-172,161	-4.77%	$3.99	Q1 2022
12/31/2021	0%	0%	$22.4M	3.61M	-74,163	-2.01%	$6.22	Q4 2021
9/30/2021	0%	+0%	$34.7M	3.68M	+500,009	+15.7%	$9.43	Q3 2021
6/30/2021	0%	+0%	$43.2M	3.18M	+64,216	+2.06%	$13.58	Q2 2021
3/31/2021	0%	+0%	$50.4M	3.12M	+48,851	+1.59%	$16.18	Q1 2021
12/31/2020	0%	+0%	$81.7M	3.07M	+227,817	+8.02%	$26.61	Q4 2020
9/30/2020	0%	0%	$52.9M	2.84M	-23,762	-0.83%	$18.62	Q3 2020
6/30/2020	0%	+0%	$67M	2.86M	+972,435	+51.4%	$23.40	Q2 2020
3/31/2020	0%	+0%	$11M	1.89M	+24,764	+1.33%	$5.83	Q1 2020
12/31/2019	0%	0%	$10.7M	1.87M	-4,207	-0.22%	$5.73	Q4 2019
9/30/2019	0%	0%	$2.96M	1.87M	-32,031	-1.68%	$1.58	Q3 2019
6/30/2019	0%	+0%	$7.71M	1.9M	+403,011	+26.9%	$4.05	Q2 2019
3/31/2019	0%	+0%	$7.89M	1.5M	+1,233,807	+463%	$5.26	Q1 2019
12/31/2018	0%	0%	$1.09M	267K	-334,417	-55.6%	$4.08	Q4 2018
9/30/2018	0%	+0%	$6.01M	601K	+153,923	+34.4%	$10.00	Q3 2018
6/30/2018	0%	+0%	$7.99M	447K	+25,480	+6.04%	$17.86	Q2 2018
3/31/2018	0%	+0%	$6.65M	422K	+240,361	+133%	$15.77	Q1 2018
12/31/2017	0%	+0%	$2.98M	181K	+22,900	+14.5%	$16.43	Q4 2017
9/30/2017	0%	+0%	$2.74M	158K	+83,437	+111%	$17.29	Q3 2017
6/30/2017	0%	+0%	$1.05M	75K	+75,000	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.