LDK Solar (LDK), which stumbled early in the week on cautious guidance, is up 3 cents to $8.92 and August 10 calls are busy. More than 5,000 traded, compared to open interest of 2,913. 96 percent traded ask-side and ISEE sentiment data confirm that customers are buying to open positions in LDK calls Friday. Meanwhile, implied volatility is up to 104, from about 100 the day before.