Mariner
WST icon

Mariner’s West Pharmaceutical WST Stock Holding History

Mariner’s Portfolio WST Stock Details WST Fund Activity
Bought
Maintained
Sold
Quarter Market Value Status Shares Change in
Stake 		Trade Value Portfolio Weight Portfolio Position
2026
Q1 		$3.12M Sell
12,434
-10,181
-45% -$2.53M ﹤0.01% 1274
2025
Q4 		$6.23M Buy
22,615
+3,585
+19% +$981K 0.01% 915
2025
Q3 		$4.99M Buy
19,030
+6,094
+47% +$1.48M 0.01% 927
2025
Q2 		$2.83M Buy
12,936
+1,469
+13% +$314K ﹤0.01% 1135
2025
Q1 		$2.57M Sell
11,467
-199
-2% -$54.8K ﹤0.01% 1104
2024
Q4 		$3.82M Buy
11,666
+183
+2% +$57.6K 0.01% 898
2024
Q3 		$3.45M Buy
11,483
+1,078
+10% +$330K 0.01% 919
2024
Q2 		$3.43M Sell
10,405
-1,200
-10% -$424K 0.01% 873
2024
Q1 		$4.59M Buy
11,605
+928
+9% +$343K 0.01% 768
2023
Q4 		$3.76M Sell
10,677
-1,400
-12% -$495K 0.01% 792
2023
Q3 		$4.53M Buy
12,077
+388
+3% +$150K 0.01% 674
2023
Q2 		$4.47M Buy
11,689
+377
+3% +$135K 0.01% 682
2023
Q1 		$3.92M Buy
11,312
+977
+9% +$285K 0.01% 711
2022
Q4 		$2.45M Buy
10,335
+3,801
+58% +$901K 0.01% 839
2022
Q3 		$1.61M Buy
+6,534
New +$1.99M 0.01% 859
2019
Q3 		– Sell
-3,645
Closed -$456K – 1061
2019
Q2 		$456K Buy
3,645
+54
+2% +$6.37K 0.01% 752
2019
Q1 		$396K Buy
+3,591
New +$374K 0.01% 725

Other funds holding WST

BlackRock
BlackRock New York $5.72T AUM 30.48% 1-Year Est. Return
VCM
Vanguard Capital Management Malvern, Pennsylvania $4.04T AUM
VPM
Vanguard Portfolio Management Malvern, Pennsylvania $1.91T AUM
State Street
State Street Boston, Massachusetts $2.9T AUM 29.55% 1-Year Est. Return
Artisan Partners
Artisan Partners Milwaukee, Wisconsin $62.3B AUM 26.25% 1-Year Est. Return
Bank of New York Mellon
Bank of New York Mellon New York $544B AUM 28.31% 1-Year Est. Return
T. Rowe Price Investment Management
T. Rowe Price Investment Management Baltimore, Maryland $145B AUM 22.78% 1-Year Est. Return
GIM
Generation Investment Management London, United Kingdom $11.2B AUM 0.58% 1-Year Est. Return
Geode Capital Management
Geode Capital Management Boston, Massachusetts $1.61T AUM 30.72% 1-Year Est. Return
Morgan Stanley
Morgan Stanley New York $1.66T AUM 25.57% 1-Year Est. Return

Mariner's WST Position: Q1 2026 in Review

Mariner reduced its West Pharmaceutical (WST) stake by 45% in Q1 2026, selling an estimated $2.53M and leaving 12,434 shares worth $3.12M. The position accounts for ﹤0.01% of the portfolio, ranked #1274.

Mariner first reported a position in WST in Q1 2019 and has held it in 17 quarters since. The position peaked at $6.23M in Q4 2025. 753 funds tracked by Wall St. Rank hold WST as of Q1 2026.

  • Mariner held 12,434 shares of West Pharmaceutical worth $3.12M as of Q1 2026.
  • Mariner sold 10,181 West Pharmaceutical shares in Q1 2026, an estimated $2.53M.
  • West Pharmaceutical made up ﹤0.01% of Mariner's portfolio in Q1 2026, its #1274 holding.
  • Mariner first reported a position in West Pharmaceutical in Q1 2019 and has held it in 17 quarters since.
  • Mariner's West Pharmaceutical position peaked at $6.23M in Q4 2025.
  • 753 funds tracked by Wall St. Rank held West Pharmaceutical as of Q1 2026.

Based on Mariner's 13F filing for Q1 2026, filed 13 May 2026.