West Pharmaceutical Services Inc (NYSE: WST), an SEC filer in Surgical & Medical Instruments & Apparatus, closed at $337.47, -2.5%, on 2026-08-28, with a market cap of $23.7B, a trailing P/E of 49.7, a return on equity of 16.9%, a net margin of 16.1% and 3-year sales growth of 2.1%. Institutional ownership, earnings history and filed financials are on the tabs below.
| # | Holder | Shares | Value | % of shares out | Δ QoQ |
|---|---|---|---|---|---|
| 1 | BlackRock, Inc. | 6,836,7146.8M | $1.7B | 9.49% | ADD 4% |
| 2 | VANGUARD CAPITAL MANAGEMENT LLC | 4,683,2864.7M | $1.2B | 6.50% | NEW† |
| 3 | VANGUARD PORTFOLIO MANAGEMENT LLC | 4,094,0094.1M | $1.0B | 5.68% | NEW† |
| 4 | STATE STREET CORP | 3,293,7783.3M | $826M | 4.57% | — |
| 5 | Artisan Partners Limited Partnership | 2,657,8932.7M | $666M | 3.69% | TRIM -7% |
| 6 | Bank of New York Mellon Corp | 2,465,8582.5M | $618M | 3.42% | TRIM -7% |
| 7 | T. Rowe Price Investment Management, Inc. | 2,340,4032.3M | $587M | 3.25% | ADD 19% |
| 8 | GENERATION INVESTMENT MANAGEMENT LLPtracked | 2,243,9762.2M | $562M | 3.12% | ADD 44% |
| 9 | GEODE CAPITAL MANAGEMENT, LLC | 1,912,4551.9M | $478M | 2.66% | ADD 2% |
| 10 | MORGAN STANLEY | 1,458,2821.5M | $366M | 2.02% | TRIM -5% |
† NEW this big is usually a rename.
Ranked by each filer’s own reported value, not shares.
1 holder — The filer reported no value for this line, so it carries no dollar figure and is left out of the percentage and value columns.
| Biggest buyers | Δ shares | Δ value | |
|---|---|---|---|
| VANGUARD CAPITAL MANAGEMENT LLC | +4,683,286 | $1.2B | OPEN |
| VANGUARD PORTFOLIO MANAGEMENT LLC | +4,094,009 | $1.0B | OPEN |
| FMR LLC | +1,140,094 | $286M | ADD |
| JPMORGAN CHASE & CO | +768,457 | $193M | ADD |
| GENERATION INVESTMENT MANAGEMENT LLP | +682,107 | $171M | ADD |
| Biggest sellers | Δ shares | Δ value | |
|---|---|---|---|
| VANGUARD GROUP INC | −9,539,173 | $2.4B | CLOSE |
| NORGES BANK | −988,737 | $248M | CLOSE |
| FRANKLIN RESOURCES INC | −876,596 | $220M | TRIM |
| BROWN ADVISORY INC | −602,729 | $151M | TRIM |
| STEADFAST CAPITAL MANAGEMENT LP | −429,907 | $108M | CLOSE |
Prior quarter split-rebased · 13Fs are long, US-listed only.
| Holder | 2024-Q4 | 2025-Q1 | 2025-Q2 | 2025-Q3 | 2025-Q4 | 2026-Q1 | Latest value |
|---|---|---|---|---|---|---|---|
| BlackRock, Inc. | 7.5M | 6.9M | 6.6M | 6.5M | 6.6M | 6.8M | $1.7B |
| VANGUARD CAPITAL MANAGEMENT LLC | — | — | — | — | — | 4.7M | $1.2B |
| VANGUARD PORTFOLIO MANAGEMENT LLC | — | — | — | — | — | 4.1M | $1.0B |
| STATE STREET CORP | 3.2M | 3.2M | 3.3M | 3.2M | 3.3M | 3.3M | $826M |
| Artisan Partners Limited Partnership | 3.1M | 2.2M | 2.3M | 2.8M | 2.9M | 2.7M | $666M |
| Bank of New York Mellon Corp | 3.4M | 3.4M | 3.2M | 2.9M | 2.7M | 2.5M | $618M |
| T. Rowe Price Investment Management, Inc. | 733K | 462K | 466K | 701K | 2.0M | 2.3M | $587M |
| GENERATION INVESTMENT MANAGEMENT LLPtracked | — | — | 1.2M | 976K | 1.6M | 2.2M | $562M |
| GEODE CAPITAL MANAGEMENT, LLC | 1.8M | 1.9M | 1.8M | 1.9M | 1.9M | 1.9M | $478M |
| MORGAN STANLEY | 1.0M | 1.3M | 1.5M | 1.5M | 1.5M | 1.5M | $366M |
Green = added, red = trimmed, grey = held; a dash is a quarter with no 13F on file — a gap, not an exit.
Breaks = no 13F that quarter.
Short interest has its own tab now — open SI →
SEC Form 13F · ~10,250 filers, 10y · long-only, US-listed, filed ≤45d after quarter-end.
SEC Schedule 13D/G XML · group aggregate.
