### Comment:
Why 16k? You don't need 100 blocks to the IB program. 
  
 They loan them out in 100s, hold side is &gt;1

### REPLY:
I was thinking you'd need to hold enough for a single call/put option (block of 100 \* \~$160 share price). So they do batch orders and you can opt in as long as you hold at least 1 share?

### END.