Wed, Aug 27, 2014, 1:56 PM EDT - U.S. Markets close in 2 hrs 4 mins

Recent

% | $
Quotes you view appear here for quick access.

Datalink Corporation Message Board

  • cool_scirocco cool_scirocco Nov 30, 2011 2:22 PM Flag

    Those wild and wacky algorithms

    So I decided to sell 600 shares I bought on Monday for $7.08, in order lock in a 9% gain. (not a lot, I know, but I dollar cost average in and out).

    The first attempt was to sell them at $7.79, when the bid was at $7.77 and the ask was at $7.80.

    Within 10 seconds of my order showing on LII, the computer sold a couple of hundred shares into the bid, and moved the bid/ask down to $7.75/$7.78.

    I pulled my order.

    Within three or four minutes, the computer worked it back to $7.79, and a few minutes after that, the bid/ask was at $7.80/$7.82.

    So I placed an order to sell 600 at $7.81.

    My order appeared, and within a few seconds, the computer sold into the bid and moved the best ask to below my price.

    This time I left it active, and over the next 6 minutes, it executed in small chunks.

    Really funny to me how a small order from a retail investor can cause a reaction from the computer algorithm driving most of the trading.

    SortNewest  |  Oldest  |  Most Replied Expand all replies
 
DTLK
12.40+0.10(+0.81%)1:56 PMEDT

Trending Tickers

i
Trending Tickers features significant U.S. stocks showing the most dramatic increase in user interest in Yahoo Finance in the previous hour over historic norms. The list is limited to those equities which trade at least 100,000 shares on an average day and have a market cap of more than $300 million.