On an option expiry day like today. The market will head to a price where the most numerous option holders will be hurt. This is MAXIMUM PAIN principle. Took as example, let's look at why we have some strange low prices today, and ONLY for today:
BRCD: If prices at slightly < $6, then, 47000 Nov call out of 48000 total will expire worth less, and 10000 Nov put out of 13000 total will expire.
LEXR: slightly <$20, so that 11500 Nov call out of 12000 total will expire
and 10000 out of 13000 Nov put will expire worthless
CYD: ~ $25, so that 7000 out of 8000 call will expire, 3000 out of 4400 put will expire.
BRCD: If prices at slightly < $6, then, 47000 Nov call out of 48000 total will expire worth less, and 10000 Nov put out of 13000 total will expire.
LEXR: slightly <$20, so that 11500 Nov call out of 12000 total will expire
and 10000 out of 13000 Nov put will expire worthless
CYD: ~ $25, so that 7000 out of 8000 call will expire, 3000 out of 4400 put will expire.