Form 13-F position report

WEST PHARMACEUTICAL SERV INC

Reported by BILL & MELINDA GATES FOUNDATION TRUST

Company profile Manager portfolio Source filing
WST CUSIP 955306105 Manager CIK 0001166559
Latest reported change

Reported 444,500 shares, unchanged from the prior quarter.

Reported value -8.9%; share count 0.0% vs. the prior quarter.

Unchanged
% of reported 13F value 0.35% This manager · Q1 2026
Shares 444,500 Quarter-end amount reported
Reported value $111,409,480 Fair value at quarter end
Consecutive quarters held 5 Through Q1 2026

Reported position value by quarter

Reported position value by quarter

Each bar is a Form 13-F quarter-end snapshot. It does not show trades made within the quarter.

Manager history

Quarterly position history

How this manager's reported quarter-end position changed over time.

6 quarters
Quarter Activity Shares Change % of reported 13F Reported value Filed
Q2 2026 Unchanged 444,500 0 (0.0%) 0.46% $159,575,500 2026-08-14
Q1 2026 Unchanged 444,500 0 (0.0%) 0.35% $111,409,480 2026-05-15
Q4 2025 Unchanged 444,500 0 (0.0%) 0.35% $122,299,730 2026-02-17
Q3 2025 Unchanged 444,500 0 (0.0%) 0.32% $116,605,685 2025-11-14
Q2 2025 Unchanged 444,500 0 (0.0%) 0.2% $97,256,600 2025-08-14
Q1 2025 New 444,500 +444,500 (0.0%) 0.24% $99,514,660 2025-05-15
Institutional context

Who else reported the position

887 managers reported WEST PHARMACEUTICAL SERV INC for Q1 2026.

Manager Activity Shares Change % of reported 13F Reported value Tenure
BlackRock Inc Added 6,836,714 +236,979 0.03% $1,713,554,040 7 qtrs
VANGUARD CAPITAL MANAGEMENT LLC New 4,683,286 +4,683,286 0.03% $1,173,818,803 1 qtr
VANGUARD PORTFOLIO MANAGEMENT LLC New 4,094,009 +4,094,009 0.05% $1,026,122,416 1 qtr
STATE STREET CORPORATION Added 3,293,778 +41,758 0.03% $825,552,518 52 qtrs
Artisan Partners Limited Partnership Reduced 2,657,893 -192,508 1.07% $666,174,221 35 qtrs
THE BANK OF NEW YORK MELLON CORPORATION Reduced 2,465,858 -196,177 0.11% $618,042,720 52 qtrs
T Rowe Price Investment Management Inc Added 2,340,403 +1,165,441 0.4% $586,599,000 15 qtrs
GENERATION INVESTMENT MANAGEMENT LLP Added 2,243,976 +682,107 5.04% $562,430,145 4 qtrs
GEODE CAPITAL MANAGEMENT LLC Added 1,912,455 +43,369 0.03% $477,525,250 52 qtrs
MORGAN STANLEY Reduced 1,458,282 -73,576 0.02% $365,504,513 52 qtrs
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Filing details and methodology As reported
Report period
March 31, 2026
Filed
May 15, 2026
Filing type
13F-HR
Position type
COM

Voting authority reported

Sole
444,500
Shared
0
None
0

“None” means the manager reported no voting authority for those shares on non-routine matters. It does not disclose why and is not evidence of securities lending.

Form 13-F is a delayed quarter-end snapshot of disclosed long Section 13(f) securities. It can be filed up to 45 days after quarter end, excludes short positions and most non-U.S. securities, and does not reveal intra-quarter trading. For options, reported shares and value describe the underlying-share exposure; strike, expiry, premium, and written positions are not disclosed.