I bought 3 call options with expiry in November but as soon as I had bought them the ‘bid’ disappeared with only an ‘ask’ remaining.
All the bid-ask prices in every other strike remain visible, only no bid in the strike I bought as well as another lower strike which also had been bought by someone (not me).
My question is:
Are market makers not prohibited from refusing to make a market in options they happily accept premium from?