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 4.9%; share count 0.0% vs. the prior quarter.

Unchanged
% of reported 13F value 0.35% This manager · Q4 2025
Shares 444,500 Quarter-end amount reported
Reported value $122,299,730 Fair value at quarter end
Consecutive quarters held 4 Through Q4 2025

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

861 managers reported WEST PHARMACEUTICAL SERV INC for Q4 2025.

Manager Activity Shares Change % of reported 13F Reported value Tenure
VANGUARD GROUP INC Reduced 9,539,173 -165,775 0.04% $2,624,608,060 51 qtrs
BlackRock Inc Added 6,599,735 +143,874 0.03% $1,815,851,080 6 qtrs
STATE STREET CORPORATION Added 3,252,020 +44,109 0.03% $894,760,783 51 qtrs
Artisan Partners Limited Partnership Added 2,850,401 +79,481 1.17% $784,259,419 34 qtrs
THE BANK OF NEW YORK MELLON CORPORATION Reduced 2,662,035 -242,674 0.13% $732,432,196 51 qtrs
BROWN ADVISORY INC Reduced 1,943,606 -554,476 0.75% $534,770,720 36 qtrs
GEODE CAPITAL MANAGEMENT LLC Added 1,869,086 +11,962 0.03% $512,249,725 51 qtrs
GENERATION INVESTMENT MANAGEMENT LLP Added 1,561,869 +585,855 2.98% $429,732,636 3 qtrs
MORGAN STANLEY Added 1,531,858 +53,229 0.03% $421,476,429 51 qtrs
T Rowe Price Investment Management Inc Added 1,174,962 +473,547 0.2% $323,280,000 14 qtrs
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Filing details and methodology As reported
Report period
December 31, 2025
Filed
February 17, 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.