I think you misinterpreting BalastarG.I think the poster...

I think you misinterpreting BalastarG.

I think the poster originally opened a sold call position (over shares they own- a covered call) for 18 cents some time ago.

And then closed that same position (by buying back) for 0.9 cents more recently. Profit 17.1 cents/share.

I don't think he "resold" the same position directly after.

Also, whilst "market makers" certainly do provide quotes on asx options their price is determined by a mathematic formulaic method (variations of the Black- Scholes equation) - rather different to warrants, where the price is determined by the market makers. You can either buy or sell to open with asx options, this not possible with warrants, where you can only sell previously bought positions.

Because you can take either an initial bought or sold position, market makers cannot "force" you to take it or leave it when pricing, and have to establish a mathematically fair price (albeit wth as much spread or "slippage" as they can manage).