Apple at 50% of Your Portfolio - a 30% AAPL Drop Cuts Net Worth by 15%

So you inherited roughly $600,000 in Apple (NASDAQ: AAPL) stock and it now represents about half of your holdings. Short answer from the trading desk: that's concentrated. The rest of this note explains what that actually means in numbers and scenarios, without telling anyone what to do.

The setup
If Apple makes up 50% of your portfolio, that implies a total portfolio value around $1.2 million. One company driving half of your net worth creates a very different risk profile than owning a dozen similarly sized positions. Concentration risk isn't a buzzword - it's math and psychology.

How concentration amplifies moves
Here's a plain example to quantify the exposure. Assume annualized volatility for the Apple position is 30% and the rest of the portfolio has 12% volatility, with a modest 0.2 correlation between them. Using the standard portfolio variance formula, the blended annual volatility works out to roughly 17%.

Why this matters: a 30% volatile asset at half your weight can push portfolio swings well above what the non-Apple half would deliver on its own. And extremes are sharper: if Apple fell 40% in a shock while the other half held flat, the entire portfolio would slide about 20%.

Company-level facts that affect the risk picture
Apple is big, profitable, and cash-generative. It's diversified across hardware, services and wearables, and its buyback program has been reducing float for years. But there are real single-company exposures embedded in the position: a lot of revenue still flows from the iPhone franchise; supply-chain hiccups and China market trends matter a lot; antitrust and regulatory scrutiny can create episodic volatility; and big buybacks change float dynamics (good for EPS, but they also alter liquidity and concentration).

Tax and estate mechanics - the practical edge
One useful inheritance detail for U.S. taxpayers: the cost basis of inherited securities commonly receives a step-up to the market value at death. That means, in many cases, an immediate sale could generate little or no federal capital-gains tax based on the original decedent's purchase price. Estate-tax considerations are a separate matter and depend on the size of the full estate relative to exemption thresholds.

Common ways holders handle big single-stock positions
Market participants deal with concentrated holdings in different ways. You'll see people hold through volatility, sell portions over time, use option-based hedges to cap downside at a cost, gift or donate shares for tax or philanthropic planning, or use trust structures for estate reasons. Each tactic has trade-offs: execution costs, tax consequences, opportunity cost, and complexity.

How to think about the risk, quantitatively
If you want a crisp metric, calculate how much of a portfolio drawdown would come from a given hit to Apple. Example: a 30% drop in Apple = 15% hit to a 50%-weighted portfolio, assuming the rest doesn't move. Another approach is to compute the marginal contribution to portfolio volatility from the Apple position; if it's the largest contributor, it's the dominant driver of returns and losses.

A final, practical note
Concentration isn't inherently "bad" - plenty of wealthy individuals sit with large single-stock positions for years. But it is a feature of a portfolio, not a bug to ignore: it increases sensitivity to company-specific news, regulatory moves, and single-event shocks. How risky it feels depends on time horizon, cash needs, tax posture, and risk tolerance - variables that live in your spreadsheet, not in this memo.

Half your net worth in one mega-cap: clear and measurable exposure. What that looks like in practice will depend on the rest of the portfolio and the scenarios you care about. Which scenario worries you most - a sudden correction, a prolonged slowdown in a key market, or something else?