West Pharmaceutical Services (WST) Stock Concentration Calculator

Calculator · free · no signup · WST

Quantify West Pharmaceutical Services concentration risk. Drawdown impact at 30 / 50 / 70%, with the tax-aware trade-off between selling down and hedging.

Beta · invite-only · AlphaLatitude Inc. · Free Tools

Your inputs

Adjust — results update instantly.

Position & portfolio

Default. Adjust to test.
35%
Default. Adjust to test.
20%
10%

Tax

67%
Highly concentratedLong-term
If 30% drop
−$150,000
If 50% drop
−$250,000
If 70% drop
−$350,000

Most fee-only advisors target ≤10% in any single name. You're at 67%.

Estimates only. Not financial advice.

Most sensitive to: Expected market return (±10% on this input swings best-plan wealth by ±$190,508).

Cost of fully de-concentrating

All three plans sell to 0% (no hedge).

Tax
Wealth (3y)$956,485
+$33,417 vs.

Tax
Wealth (3y)$994,174
+$71,106 vs.

Tax
Wealth (3y)$1.04M
+$112,490 vs.

Sensitivity. If your expected position return drops below 19.6%/yr, lump-sum (sell everything today) beats every spread plan above.

Have multiple RSU vest lots? The RSU Lot Order Calculator picks which lots to sell first, and on which dates, to divest at the lowest computed tax.

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Build your own plan

Toggle below — chart updates live. Sell buttons show the slice.
Sell over 1 yearSell over 2 yearsSell over 3 yearsCustom
$712,500$815,995$919,489$1,022,984$1,126,478Yr 0Yr 1Yr 2Yr 3
Year 1
Year 2
Year 3
Tax$200,753
Hedge cost$37,676
Wealth at Y3$1,046,371
Vs. best fixed plan+$10,813

Tech / Software single names hit a 50%+ peak-to-trough drawdown in roughly 1 of every 5 rolling 3-year windows over 2014–2024. Even mega-caps aren’t exempt.

Tax brackets: 2026 · Estimates only — not financial advice.

Estate note. Heirs receive a stepped-up basis at death (§1014), eliminating built-in gain on inherited shares. Older holders who plan to bequeath rather than sell may rationally never de-concentrate.

You sized one position's risk. The beta integrates hedging, sell-down, and tax timing into one optimized plan.

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Related calculators: Protect Your Stock Calculator · RSU Lot Order Calculator · Equity Funding Plan Calculator

About West Pharmaceutical Services

West Pharmaceutical Services (WST) is a public Medical Device company, incorporated in Pennsylvania and headquartered in Exton, PA.

Last close: $346.59 per share (as of 2026-08-19).

Equity grants at West Pharmaceutical Services typically include restricted stock units (RSUs).

West Pharmaceutical Services, Inc. is a designer and manufacturer of injectable pharmaceutical packaging and delivery systems. Founded in 1923 by Herman O. West and J.R. Wike of Philadelphia, the company is headquartered in Exton, Pennsylvania. In its early years of development, West produced rubber components for packaging injectable drugs, providing a sterile environment for the producers of penicillin and insulin.

Source: Wikipedia (CC BY-SA 4.0)

The company makes the rubber stoppers, seals, and syringe components that sit between an injectable drug and its container, a category most people never see and no drug maker can skip. Components are qualified as part of a drug's regulatory filing, so changing supplier means revisiting an approval, which produces switching costs out of all proportion to the price of the part. Growth has followed the shift toward biologics and self-administered injectables. Manufacturing precision and particulate control define the technical moat. Headquarters are in Exton, Pennsylvania.

Sources: sec.gov · en.wikipedia.org

OptionsAhoy is an independent tool and is not affiliated with, endorsed by, or sponsored by West Pharmaceutical Services.

If a meaningful share of your net worth sits in WST, concentration risk is the question. This calculator quantifies drawdown impact at 30 / 50 / 70%, and the trade-off between selling down (tax cost now) versus hedging (option premium drag), auto-filled with WST's option-implied volatility.

Example: 5,000 WST shares at $346.59 is a $1,732,950 position. A 30% drawdown costs $519,885; a 50% drawdown costs $866,475; a 70% drawdown costs $1,213,065. The calculator quantifies the trade-off between selling down (immediate capital-gains tax) and hedging (option premium drag) using WST's option-implied volatility and your cost basis.

All West Pharmaceutical Services tools → · Use the generic Stock Concentration Calculator for any company. Diversifying multiple RSU lots? See the lot-by-lot sell order →

West Pharmaceutical Services equity questions

How much WST stock is too much?
There is no single threshold, but the larger the share of your net worth in one stock, the more a single bad year can set back your plans. The calculator above quantifies the drawdown impact at 30, 50, and 70 percent for your WST position and weighs selling down (which triggers capital-gains tax now) against hedging (which costs option premium).
Does West Pharmaceutical Services grant ISOs, NSOs, or RSUs?
Equity compensation at West Pharmaceutical Services typically takes the form of restricted stock units (RSUs). Restricted stock units are taxed as ordinary income when they vest.
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