Nanex Research

Nanex ~ 05-Nov-2013 ~ $100 Billion Stock Spreads

Zooming in on best bids and offers,  from 1.5 hours down to 1 second of time in the stock of Siemens Aktiengesellschaft (symbol: SI, Market Cap $105 Billion).

Best bids and offers are color coded by exchange. The gray shading is the NBBO (National Best Bid/Offer) spread. This is what High Frequency Trading claims to narrow. Note the best bid varies from $114 to $124, while the best ask varies from about $125 to $130.

Normally you would expect the quote spread in a $105 billion dollar stock to be a bit more stable. And narrow.

Nanex Research