Staged, tax-budgeted diversification
Instead of one large sale, the position is reduced over several tax years against a defined annual gain budget. Sales are coordinated with realized losses elsewhere in the portfolio, with your other income in each year, and with any trading windows that apply to you.
Most concentrated holders, as a baseline to compare every other approach against. Often combined with the strategies below.
The unsold portion keeps its single-company risk for the entire unwind, and the stock can fall while you wait. Spreading sales assumes future tax rates and your future income, neither of which is known. Gains are still taxed when realized.