NorthWest Biotherapeutics Inc (NWBO)

[Doktornolittle]

Tried to sell some other calls to buy straight NWBO and could not. My ask was 10 cents, and I was out-offered at 7 cents. Note that options trade in 5 cent denominations.

This is the third time this has happened. Different stocks, same $ numbers. A 7 cent ask squeezes in and sells off blocking my 10 cent ask.

TD Ameritrade told me these are probably from straddles or some other coordinated transaction which forces a partial transaction for one component.

I just don't believe it. Why does this only happen when I have an ask of 10 cents?

Bank Swiss recently hit with a record fine for partial denomination transactions. May have been straight stock sales, but I wonder if it was or included calls.