neroden
Model S Owner and Frustrated Tesla Fan
The market makers in the options markets are different from the market makers in the stock.
The market markers in the stock *can't* hedge by trading the stock (think about it). They sometimes hedge by using the options markets. But they prefer to very strictly make their money off the spread. They try to avoid having a significant open position one way or the other ever. This is usually easy because liquidity on the NASDAQ is *huge* -- lots of real trading, unlike the thinly-traded options markets where over half the trades are probably with the market makers. So despite the huge amount of trading, the market maker in a stock can, if he's good at his job, typically end the day with NO position in the stock, every day.
If outside liquidity dries up on the stock and they're at risk of a one-sided position, the market makers on the stock will lower their bids and raise their asks (widen the spread) to protect themselves. I've seen that happen.
Options market makers differ because the options are much more thinly traded than the underlying stock, *and* the options market makers are trying to make money on time decay.
The market markers in the stock *can't* hedge by trading the stock (think about it). They sometimes hedge by using the options markets. But they prefer to very strictly make their money off the spread. They try to avoid having a significant open position one way or the other ever. This is usually easy because liquidity on the NASDAQ is *huge* -- lots of real trading, unlike the thinly-traded options markets where over half the trades are probably with the market makers. So despite the huge amount of trading, the market maker in a stock can, if he's good at his job, typically end the day with NO position in the stock, every day.
If outside liquidity dries up on the stock and they're at risk of a one-sided position, the market makers on the stock will lower their bids and raise their asks (widen the spread) to protect themselves. I've seen that happen.
Options market makers differ because the options are much more thinly traded than the underlying stock, *and* the options market makers are trying to make money on time decay.