Private company
Who owns Mexico affiliates (The West Company Mexico, S.A. de C.V.; Aluplast, S.A. de C.V.; Pharma Tap, S.A. de C.V.; Pharma Rubber, S.A. de C.V.)
One company in the researched set discloses a stake in Mexico affiliates (The West Company Mexico, S.A. de C.V.; Aluplast, S.A. de C.V.; Pharma Tap, S.A. de C.V.; Pharma Rubber, S.A. de C.V.), none of it sized by anyone who discloses it. Mexico affiliates (The West Company Mexico, S.A. de C.V.; Aluplast, S.A. de C.V.; Pharma Tap, S.A. de C.V.; Pharma Rubber, S.A. de C.V.) is private, so no 13F reports it: a 13F covers exchange listed positions only. These figures exist because each holder disclosed the stake in its own filings.
Mexico affiliates (The West Company Mexico, S.A. de C.V.; Aluplast, S.A. de C.V.; Pharma Tap, S.A. de C.V.; Pharma Rubber, S.A. de C.V.) - Profile
- Type
- joint venture
- Based in
- Mexico
These four Mexican companies form the West Pharmaceutical Services affiliate group in Mexico, which makes and sells containment and delivery components for injectable medicines. Three are manufacturers at Cuernavaca in the state of Morelos: Pharma Tap runs rubber mixing and compression moulding, Pharma Rubber compression moulds rubber sleeves, and Aluplast handles rubber finishing, plastic injection moulding and aluminium seal manufacture and assembly, producing rubber stoppers, syringe plungers, aluminium seals and plastic containers and closures. The fourth, The West Company Mexico, is the group's trading and sales company based in Mexico City. All four are ISO 9001 certified and are held as equity method affiliates rather than consolidated operations, sharing West technologies and product lines for the Mexican and Latin American pharmaceutical market.
Source
Mexico affiliates (The West Company Mexico, S.A. de C.V.; Aluplast, S.A. de C.V.; Pharma Tap, S.A. de C.V.; Pharma Rubber, S.A. de C.V.) files nothing with the SEC, so none of this comes from a filer record. The description was written for this site in August 2026 from West Pharmaceutical Services global locations, West Pharmaceutical Services Form 10-K for 2025 and Pharma Tap S.A. de C.V. company listing. The ownership figures below come from the holders' filings instead, and are sourced row by row.
The disclosed stakes
One row per position. Where a holder reports the same company in two share classes, both rows are shown rather than summed, because the class is part of a position's identity.
Where each figure comes from
A private stake has no ownership form behind it, so the source is always the holder's own filing or disclosure. Anything modelled says so, with the arithmetic.
- West Pharmaceutical Services, Inc.. West's FY2025 10-K (Note 7) lists four Mexico-based equity-method affiliates, each at a 49% ownership interest: The West Company Mexico, S.A. de C.V.; Aluplast, S.A. de C.V.; Pharma Tap, S.A. de C.V.; Pharma Rubber, S.A. de C.V. West's FY2019 10-K describes the Mexico relationship as '49% ownership interest in five companies majority-owned by a long-time partner located in Mexico', one company more than the four individually named in the current table; this task did not determine whether a fifth Mexico entity was dissolved, merged into one of the four, or is simply no longer individually listed, and that discrepancy is recorded in unknowns rather than resolved. value_usd is null for the same reason as the Daikyo row: all four (plus Daikyo) sit inside the single combined 'Equity method affiliates' balance ($207.1 million Q2 2026, $208.3 million FY2025 end), which is not broken out by entity in any filing found. Grouped into one holdings row here (rather than four separate null rows) because West's own MD&A treats them as one collective relationship ('the Mexico affiliates') when discussing equity-in-net-income drivers, and all four share the identical 49% ownership interest and the same undisaggregated carrying-value bucket. sourcesource 2
What this page is not
It is not a complete register. It lists the holders who happen to be inside the researched set and disclosed the stake themselves. A private company can have many other shareholders, and nothing here rules them out: venture investors, founders and employees usually appear in no public filing at all. Percentages are of Mexico affiliates (The West Company Mexico, S.A. de C.V.; Aluplast, S.A. de C.V.; Pharma Tap, S.A. de C.V.; Pharma Rubber, S.A. de C.V.) where a holder stated one, and are missing where no holder did.
