$BeyondSpring (BYSI.US)$
I bought a put option for the October 15 delivery month for 6.2 yuan. The stock price dropped by 4.2 yuan today and the option didn't increase. Why? If anyone understands, please let me know, OK? I just started buying options. If I don't have any knowledge, please let me know, thank you!

$NIO Inc (NIO.US)$ The report shows a second-quarter loss of $52 million, or a loss of 3 cents per share, calculated on a non-generally accepted accounting principles basis. In comparison, the loss per share in the same period last year was 18 cents, with a generally expected loss of 11 cents per share.
Revenue was $1.3084 billion, a 127.2% increase from $0.55047 billion in the same period last year, exceeding the market's generally expected $1.298 billion. The company had previously expected second-quarter revenue to be $1.243 billion to $1.298 billion.
Auto sales totaled $1.2254 billion, accounting for 93.7% of total revenue. In the first quarter, this high-end electric auto manufacturer reported revenue of $1.22 billion, with a loss of 4 cents per share.
The auto profit margin in the second quarter was 20.3%, compared to 21.2% in the first quarter. A year ago, the auto profit margin was 9.7%.
NIO's cash balance at the end of the second quarter was $7.5 billion, compared to $7.3 billion at the end of the first quarter.