More than 68,000 November 37 calls were sold for $0.23 against open interest, indicating that an existing position was closed. An equal number of December 38 calls were then bought for $0.48, so it looks as if the calls were rolled one month into the future.
Calls lock in the price where investors can buy stocks and funds, so they can control moves for a fraction of the price of the shares. The drawback is that they expire, and yesterday's trader was adjusting his or her position to keep from seeing the November contracts go to zero this Friday. The roll cost $0.25 and allows another five weeks to profit from upside in the fund.
The iShares FTSE China 25 Index Fund rose 0.25 percent to $36.55. Recent economic data from China has been improving, and Australia's refusal to cut rates last week reflected the growing strength in its biggest trading partner to the north. That could offset a weakening economic picture in Europe and concerns about higher taxes and less government spending in the U.S. (Read More: Chinese Leaders Say Economy Turning a Corner)
Total option volume was more than twice the daily average, with calls outnumbering puts by a bullish 5-to-1 ratio.
—By CNBC Contributor David Russell
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David Russell is a reporter and writer for OptionMonster. Russell has no positions in FXI.