Preparing to use ESO Fund — what to get ready first

The ESO Fund is about funding an option exercise without paying out of pocket. Here's what to understand before you engage.

Written & maintained by the PrivateTechShares team · Published November 2026 · Reviewed November 2026

Part of our guide to what it costs to exercise your options.

The Employee Stock Option Fund (ESO Fund) provides non-recourse funding to exercise stock options and cover the associated taxes, in exchange for a share of the proceeds if the company has a liquidity event. Non-recourse means that if the shares end up worthless, you don't repay. We're not affiliated with ESO Fund, and terms change — check directly.

When this kind of help is relevant

It's aimed at employees who have vested options worth exercising but don't want to risk the cash — or who face a large AMT bill to exercise. Non-recourse funding shifts the downside to the funder: you exercise now, and only pay back (plus a share of the gain) if there's a successful exit. The trade-off is that you give up a meaningful slice of the upside.

What to get ready first

• Know your grant — ISO vs NSO, how much is vested, your strike price, and any post-termination exercise deadline (often ~90 days).
• Work out the exercise cost — strike × shares, plus the AMT or income tax at exercise. That's the number the funding is meant to cover.
• Understand the terms — what share of the upside you give up if it goes well, and exactly what happens if it doesn't. Model the net, not the headline.
• Be honest about conviction — funding an exercise is a bet on the company. Size it to how strong that bet really is.

Weigh the cost against the alternative

Non-recourse funding removes the out-of-pocket risk of exercising — but it isn't free, and you share the upside. For some people it's the only way to avoid letting valuable options expire; for others, exercising less, or waiting, is cheaper. There's no universal answer — model your own numbers and take advice before committing. (See what to do when you can't afford to exercise, and preparing to use EquityBee.)

Further reading

General, independent references on how private-company shares and options work. We're not affiliated with any of them.

• Carta — cap tables, secondaries and valuation explainers
• Cooley GO — startup legal explainers, including rights of first refusal
• Forge Global and EquityZen — secondary marketplaces (larger, later-stage deals)
• Ledgy and Index Ventures OptionPlan — European equity & ESOP references

General information only — not financial, tax or legal advice. Every situation is different; check your own share and option agreements and take professional advice before selling. PrivateTechShares is an education and tools service: it is not a broker or marketplace, does not introduce buyers and sellers, does not hold funds, and does not execute or advise on transactions.