Currency Trading For Dummies
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In addition to the ebb and flow of liquidity and market interest during the global currency trading day, the following daily events tend to occur around the same times each day.

When currency options expire

Currency options are typically set to expire either at the Tokyo expiry (3 p.m. Tokyo time) or the New York expiry (10 a.m. ET). The New York option expiry is the more significant one, because it tends to capture both European and North American option market interest.

When an option expires, the underlying option ceases to exist. Any hedging in the spot market that was done based on the option being alive suddenly needs to be unwound, which can trigger significant price changes in the hours leading up to and just after the option expiry time.

Setting the rate at currency fixings

There are several daily currency fixings in various financial centers, but the two most important are the 8:55 a.m. Tokyo time and the 4 p.m. London time fixings. A currency fixing is a set time each day when the prices of currencies for commercial transactions are set, or fixed.

From a trading standpoint, these fixings may see a flurry of trading in a particular currency pair in the run-up (generally 15 to 30 minutes) to the fixing time that abruptly ends exactly at the fixing time. A sharp rally in a specific currency pair on fixing-related buying, for example, may suddenly come to an end at the fixing time and see the price quickly drop back to where it was before.

Squaring up on the currency futures markets

The Chicago Mercantile Exchange (CME), one of the larger futures markets in the world, offers currency futures through its International Monetary Market (IMM) subsidiary exchange. Daily currency futures trading closes each day on the IMM at 2 p.m. central time (CT), which is 3 p.m. ET. Many futures traders like to square up or close any open positions at the end of each trading session to limit their overnight exposure or for margin requirements.

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