Today was one of the craziest days on the market. The DOW had it's biggest intra-day point drop ever, falling over 1,000 points from 10,800 to just under 10,000 -- over 9%. 9% for an index! Then as quickly as it dropped, it jumped up, closing down only 3% by the end of the day. Here's what the day looked like:
But that wasn't the weirdest part. Accenture, a $40 stock, within a few minutes ended up trading at 4 cents, 1 cent, and then immediately right back up to $40. Here's the full day picture:
And here's the close-up of a single 1 minute timespan at the craziest moment (click the image for a larger version):
Remember, the chart above spans just 1 minute! There were a couple of times when there would be a trade at $30-ish or so, and then the very next trade would occur at 1 cent, and the next trade back at $30-ish. But it wasn't just one single oddball trade caused by some glitch. You can see that there were hundreds of trades (over 400, actually) in this 1 minute that gradually brought the stock price to its knees.
A few other stocks supposedly traded down at the 1 cent level as well. Also, Procter & Gamble, an extremely stable stock, briefly dropped from $60 to just below $40, before immediately returning to $60.
So What Happened?
Markets were already spooked with the riots in Greece today and the whole Greek Debt Crisis. Original sources were trying to place the blame of the market crash on a "fat finger" -- someone accidentally entering a billion-dollar order instead of a million-dollar one, which then supposedly set off a wave of automated selling. But a lot of people are saying that the markets had already dropped a lot before any supposed erroneous trades or price quotes occurred, and the drop was led by large moves in the currency markets.
Here is one article that places the blame on automated high-frequency trading:
I think it will take a few days for people to fully analyze the situation and for us to get some good, interesting articles on what happened today. I personally think that this is something that could happen any time due to the highly-automated world of trading we now live in, and it's quite scary. The Accenture graph above shows what strange things can happen when only the computers are in control.
I think this quote sums up everything the best:
"We did not know what a stock was worth today, and that is a serious problem," -- Joe Saluzzi of Themis Trading.