How concentrated is your portfolio?

Optimization. Quantifies single-stock drawdown exposure at 30/50/70% and searches the multi-year sell-down vs hold vs hedge space on an after-tax basis, returning the schedule that maximizes risk-adjusted terminal value. The search is deterministic: the same inputs on the same date return the same answer, so the recommendation is verifiable.

Tax-code coverage. Relevant federal code (ordinary brackets, long-term capital gains, AMT with credit recovery, FICA, Net Investment Income Tax) plus each state's own return for all 50 states and DC (starting income, deductions, exemptions, surtaxes, LTCG treatment). State AMT modeled for CA, CO, CT, MN. Brackets reflect IRS Rev. Proc. 2025-32 and the One Big Beautiful Bill Act (OBBBA) provisions for tax year 2026. Validated against 870+ unit tests covering bracket math, AMT credit recovery, state conformity, and the optimizer's search path.

Why use an optimizer rather than asking an LLM to do the math: a benchmark of five frontier large language models on the same multi-year ISO problem found that all 15 trials overstated the after-tax result of their own proposed schedule by 2x to 20x (HackerNoon write-up).