Updated July 28, 2026. Quick answer: Employer stock held inside a 401(k) is usually the least-examined position people own: it does not appear alongside their brokerage holdings, and its risk correlates directly with the job paying for the contributions.
Why it hides
It sits in a retirement account most people review once a year, denominated as a percentage of a plan rather than as a dollar amount next to other holdings. A position that would look alarming in a brokerage statement looks like a line item in a plan summary.
The correlation nobody prices
The same downturn that halves the stock can end the job funding the contributions. That is the opposite of diversification: the asset and the income stream fail together.
Before you simply sell it
If the shares are meaningfully appreciated, selling inside the plan or rolling to an IRA forfeits the NUA election permanently. Check the plan cost basis before doing anything — a low basis relative to value is exactly the case where the election is worth most.
The practical sequence
Find the plan cost basis. Compare the NUA route against a rollover. Decide which, then execute once and correctly — the election depends on a qualifying lump-sum distribution and is not recoverable if the sequence is wrong.
Sources
IRC §402(e)(4)(B); IRC §402(e)(4)(D); ERISA §404(a)(1)(C) (diversification duty).
This states what the cited authority says. It is not tax advice.