Quote from Option Trader:
Based on what your saying (including your last message), it may be either the programmed traders, or the specialists who do the job. What I mentioned does not require they initiate a downtick, rather only to scare away buyers with showing gigantic asks, which also "requires" others to sell at the bid to pull out of their positions, letting the retail folks to drive it down themselves.
FWIW, we teach our new traders that "price goes to size" - big offers are often only put up if the seller is pretty sure there are plenty of buyers. The old adage "no buyers at the bottom, and no sellers at the top" tends to ring true. If I'm long, and all market conditions being equal, I like to see a bigger offer....and watch all the newbies sell a penny below the offer, have the buyer take the penny better stock and all the offer, leaving those penny shorts to chase the stock up a nickel or dime to cover.
A specialist won't show a false "gigantic ask" for many reasons, mostly regulatory.
Don