In this case, the trader will receive $10 if Sina closes above $80 at the August expiration three weeks from now. The investor paid $1 for the spread, which means that the profit would be 900 percent if the the Shanghai-based online media company reaches that $80 level.
Sina rose 1.04 percent to $64.29 yesterday and is up 22 percent in the last month. The call spread was initiated before Chinese Internet giant Baidu issued quarterly results after yesterday's close. That report was strong and sent Sina higher by another 3 percent in extended trading.
The company hasn't yet announced the timing of its own earnings release, but last year's calendar suggests that it will occur around Aug. 15. That would be before yesterday's spread expires, so there is at least one more potential catalyst coming.
Total option volume in the name was twice its daily average, with calls outnumbering puts by a bullish 3-to-1 ratio.
—By CNBC Contributor David Russell.
Additional news: China
stocks lead Asia up on stimulus talk
Additional views: Silent killer stalking stocks, says Cramer
Options Trading School:
David Russell is a reporter and writer for OptionMonster. Russell has no positions in SINA.