Volatility Index (VIX)
1 Year daily reading
Chart via Yahoo
I haven’t done a study on the actual correlation between the dropping of the uptick rule in July 2007 and what its impact has been on volatility. My assumption is that it would lead to an increase in the VIX readings, and that is what you see on the chart above.
While there is correlation, I do not if there is any causation for sure. Some smart academic should do a study on this.
Meanwhile, I can tell you anecdotally that many of the short firms we deal with are far more willing to cover positions quickly. Last Friday’s rally is a perfect example. There is less of a worry of being able to get an uptick to reshort a position.
Perversely, the initial effect seems to be increased upside volatilty!
Bespoke Group has some words about the Uptick Rule and Its Pilot Period that are worth reviewing.
A comment asked for a longer term VIX chart:
Please use the comments to demonstrate your own ignorance, unfamiliarity with empirical data and lack of respect for scientific knowledge. Be sure to create straw men and argue against things I have neither said nor implied. If you could repeat previously discredited memes or steer the conversation into irrelevant, off topic discussions, it would be appreciated. Lastly, kindly forgo all civility in your discourse . . . you are, after all, anonymous.