Intuitive Surgical (ISRG) Stock Concentration Calculator

Calculator · free · no signup · ISRG

Quantify Intuitive Surgical 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 Intuitive Surgical

Intuitive Surgical (ISRG) is a public Other company, incorporated in Delaware and headquartered in Sunnyvale, CA.

Equity grants at Intuitive Surgical typically include restricted stock units (RSUs).

Intuitive Surgical, Inc. is an American biotechnology company that develops, manufactures, and markets robotic products designed to improve clinical outcomes of patients through minimally invasive surgery, most notably with the da Vinci Surgical System. The company is part of the Nasdaq-100, S&P 100 and S&P 500. As of 31 December 2021, Intuitive Surgical had an installed base of 6,730 da Vinci Surgical Systems, including 4,139 in the U.S., 1,199 in Europe, 1,050 in Asia, and 342 in the rest of the world.

Source: Wikipedia (CC BY-SA 4.0)

Founded in 1995 to commercialize robotic surgery research from SRI International, the company won clearance for the da Vinci system in 2000 and built a franchise on the razor-and-blade model: hospitals buy a system, then purchase instruments and accessories that expire after a set number of uses. That recurring revenue now exceeds system sales. Surgeon training and installed base create switching costs that have held competitors off for two decades. Ion extends the platform to lung biopsy. Headquarters are in Sunnyvale, California.

Sources: intuitive.com · en.wikipedia.org

Equity comp at Intuitive Surgical

  • RSUs use single-trigger vesting: shares become yours as each portion vests on schedule, and the value is taxed as ordinary income at that point. No IPO or acquisition is required.

Researched 2026-08-17.

OptionsAhoy is an independent tool and is not affiliated with, endorsed by, or sponsored by Intuitive Surgical.

If a meaningful share of your net worth sits in ISRG, 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 ISRG's option-implied volatility.

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

Intuitive Surgical equity questions

How much ISRG 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 ISRG position and weighs selling down (which triggers capital-gains tax now) against hedging (which costs option premium).
Does Intuitive Surgical grant ISOs, NSOs, or RSUs?
Equity compensation at Intuitive Surgical typically takes the form of restricted stock units (RSUs). Restricted stock units are taxed as ordinary income when they vest.
Do Intuitive Surgical RSUs use double-trigger vesting?
No. Intuitive Surgical restricted stock units (RSUs) use single-trigger vesting: each tranche becomes yours as it vests on schedule, taxed as ordinary income at that point, with no liquidity event required.
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