William Blair Investment Management’s West Pharmaceutical WST Stock Holding History

Bought

Maintained

Sold

Quarter	Market Value	Status	Shares	Change in Stake	Trade Value	Portfolio Weight	Portfolio Position
2026 Q1	$9.96M	Sell	39,725 -1,517	-4%	-$377K	0.03%	314
2025 Q4	$11.3M	Buy	41,242 +437	+1%	+$120K	0.03%	309
2025 Q3	$10.7M	Sell	40,805 -325,347	-89%	-$79.1M	0.03%	318
2025 Q2	$80.1M	Buy	366,152 +13,314	+4%	+$2.85M	0.21%	114
2025 Q1	$79M	Sell	352,838 -287,897	-45%	-$79.3M	0.22%	115
2024 Q4	$210M	Buy	640,735 +563,705	+732%	+$177M	0.51%	53
2024 Q3	$23.1M	Buy	77,030 +10,545	+16%	+$3.23M	0.06%	287
2024 Q2	$21.9M	Buy	66,485 +5,492	+9%	+$1.94M	0.06%	288
2024 Q1	$24.1M	Buy	+60,993	New	+$22.6M	0.06%	286
2023 Q2	–	Sell	-1,595	Closed	-$553K	–	424
2023 Q1	$553K	Buy	+1,595	New	+$466K	﹤0.01%	356
2019 Q1	–	Sell	-749,634	Closed	-$73.5M	–	428
2018 Q4	$73.5M	Sell	749,634 -684,983	-48%	-$74.3M	0.37%	91
2018 Q3	$177M	Sell	1,434,617 -194,122	-12%	-$21.8M	0.62%	51
2018 Q2	$162M	Buy	1,628,739 +318,397	+24%	+$29.3M	0.6%	50
2018 Q1	$116M	Buy	1,310,342 +37,935	+3%	+$3.55M	0.44%	76
2017 Q4	$126M	Buy	1,272,407 +383,646	+43%	+$37.6M	0.49%	68
2017 Q3	$85.6M	Buy	+888,761	New	+$80.4M	0.31%	108
2015 Q4	–	Sell	-7,345	Closed	-$398K	–	475
2015 Q3	$398K	Buy	+7,345	New	+$428K	﹤0.01%	1013