Crude options volatility was little changed as oil futures fell for the fourth time in five days.
Implied volatility for at-the-money options expiring in April, a measure of expected price swings in futures and a gauge of options prices, was 20.06 percent at 3:35 p.m. on the New York Mercantile Exchange, up from 19.92 yesterday.
West Texas Intermediate crude for April delivery fell 39 cents to settle at $90.43 a barrel on the Nymex. Prices have slid 7.7 percent from a year-to-date high of $97.94 on Jan. 30.
The most-active options in electronic trading today were June $110 calls, which declined 2 cents to 11 cents a barrel on volume of 4,299 contracts. April $92 calls were the second-most active with 2,675 lots. They slipped 18 cents to 49 cents a barrel.
Calls accounted for 55 percent of electronic trading volume. In the previous session, puts made up 52 percent of the 126,495 contracts traded.
April $85 puts were the most active options traded yesterday, with 7,050 contracts changing hands. They fell 15 cents to 10 cents a barrel. April $82 puts declined 6 cents to 3 cents on 5,579 lots.
Open interest was highest for December $105 calls with 36,271 contracts. Next were April $110 calls at 34,205 and June $90 puts at 30,598.
The exchange distributes real-time data for electronic trading and releases information the next business day on open- outcry volume, where the bulk of options activity occurs.
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