Should I hold my employer's stock in my 401(k)?
Keep it small — usually under 10% of the portfolio — because holding it ties your savings to the same company that already pays your salary.
The risk is correlation, not the company. If the business struggles, the plausible outcomes include your income and your retirement account falling together, at the moment you can least afford either. DiversificationOwning enough different things that no single outcome decides your result. It is the one adjustment that reduces risk without a matching reduction in expected return.Read the evidence on this → exists specifically to break that link, and company stock re-creates it.
It is also a bet made on the worst available evidence. Observed allocations to employer stock track the share price's recent performance, which is the classic pattern of buying after a rise. Employees are not better informed about their employer's stock than the market is; they are more attached to it.
The general case is stronger still: most individual stocks underperform Treasury billShort-dated US government debt, the conventional stand-in for a risk-free asset. When a study says a stock underperformed T-bills, it means holding it was worse than holding the safest thing available. over their lifetimes, and aggregate market wealth traces to a small minority of them. Concentration is not a way to raise Expected returnThe probability-weighted average of what could happen — not a prediction of what will. A strategy can have the higher expected return and still be the wrong choice for someone who cannot survive its bad tail. — it is a way to widen the distribution.
When the answer is different
- Vesting schedules, blackout periods and insider-trading windows can restrict when you are allowed to sell.
- Net unrealised appreciation rules can make a lump-sum distribution of employer stock tax-advantaged in specific circumstances — one of the few places where individual advice genuinely earns its fee.
Put your own numbers to it
Every answer here is general. These are not.
- Allocation and risk capacity
How much risk can I take, and how much can I stand?
The research this rests on
Each note states its claim, rates how strong the evidence actually is, and lists the conditions under which it fails.
- Company stock in your 401(k) doubles a bet you have already made
Holding your employer's shares in your retirement account correlates your savings with your income, and observed allocations track the stock's past returns rather than any forward-looking judgement. (strong)
- Most individual stocks lose money; a few pay for everything
The majority of individual stocks underperform Treasury bills over their lifetimes, and aggregate stock market wealth creation traces to a small minority of firms. (strong)
- Investors underperform the funds they own
The return the average investor earns is measurably lower than the return of the funds they hold, because of when they buy and sell. (strong)
Terms used on this page
The same definitions the underlined words open, written out so nothing on this page depends on a click.
- Diversification
- Owning enough different things that no single outcome decides your result. It is the one adjustment that reduces risk without a matching reduction in expected return. Evidence →
- Treasury bill
- Short-dated US government debt, the conventional stand-in for a risk-free asset. When a study says a stock underperformed T-bills, it means holding it was worse than holding the safest thing available.
- Expected return
- The probability-weighted average of what could happen — not a prediction of what will. A strategy can have the higher expected return and still be the wrong choice for someone who cannot survive its bad tail.