Wellington Management Group’s Mersana Therapeutics MRSN Stock Holding History

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2025 Q1	–	Sell	-23,046	Closed	-$824K	–	2016
2024 Q4	$824K	Sell	23,046 -1,686	-7%	-$87.2K	﹤0.01%	1751
2024 Q3	$1.17M	Buy	24,732 +3,417	+16%	+$151K	﹤0.01%	1680
2024 Q2	$1.07M	Sell	21,315 -70	-0.3%	-$5.06K	﹤0.01%	1656
2024 Q1	$2.4M	Buy	+21,385	New	+$2.13M	﹤0.01%	1484
2022 Q3	–	Sell	-19,226	Closed	-$2.22M	–	2106
2022 Q2	$2.22M	Hold	19,226	–	–	﹤0.01%	1518
2022 Q1	$1.92M	Sell	19,226 -181,457	-90%	-$21.2M	﹤0.01%	1613
2021 Q4	$31.2M	Sell	200,683 -39,612	-16%	-$7.71M	0.01%	978
2021 Q3	$56.6M	Sell	240,295 -34,798	-13%	-$10.2M	0.01%	776
2021 Q2	$93.4M	Buy	275,093 +27,981	+11%	+$10.6M	0.02%	651
2021 Q1	$100M	Buy	247,112 +60,989	+33%	+$29.6M	0.02%	613
2020 Q4	$124M	Buy	186,123 +34,490	+23%	+$19.2M	0.02%	534
2020 Q3	$70.6M	Buy	151,633 +36,188	+31%	+$18.3M	0.01%	602
2020 Q2	$67.5M	Buy	115,445 +114,604	+13,627%	+$39.1M	0.02%	615
2020 Q1	$123K	Hold	841	–	–	﹤0.01%	1870
2019 Q4	$121K	Sell	841 -33,876	-98%	-$2.48M	﹤0.01%	1991
2019 Q3	$1.37M	Sell	34,717 -1,361	-4%	-$99K	﹤0.01%	1669
2019 Q2	$3.65M	Sell	36,078 -2,551	-7%	-$301K	﹤0.01%	1453
2019 Q1	$5.08M	Sell	38,629 -47	-0.1%	-$5.91K	﹤0.01%	1375
2018 Q4	$3.94M	Sell	38,676 -70,540	-65%	-$11.2M	﹤0.01%	1448
2018 Q3	$27.3M	Buy	109,216 +299	+0.3%	+$100K	0.01%	978
2018 Q2	$48.6M	Sell	108,917 -9,097	-8%	-$3.99M	0.01%	801
2018 Q1	$46.5M	Buy	118,014 +21,281	+22%	+$8.4M	0.01%	808
2017 Q4	$39.7M	Buy	96,733 +1,077	+1%	+$470K	0.01%	841
2017 Q3	$41.3M	Buy	95,656 +13,762	+17%	+$5.42M	0.01%	808
2017 Q2	$28.3M	Buy	+81,894	New	+$28.3M	0.01%	912