Equity Derivatives Anatomy™
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Quantos, or "quantity adjusting options", are derivatives in which the underlying exposure is denominated in one currency, but the instrument itself is settled by reference to another currency at a fixed rate determined at the outset of the transaction. Quantos accordingly shield the purchaser from exchange rate fluctuations.

Essentially, a quanto has an embedded currency forward with a variable notional amount. It is that variable notional amount that give the quantity adjusting option its name.