In the past couple of years, since Walmart's RFID plans became public, I have been looking for stock opportunities in this field. I haven't found any publicly traded companies that are pure plays. This article mentions ThingMagic LLC, and I went to their website and they talk about "generous stock options" for prospective employees. But I can't find that company listed on any exchange or OTC.
Siemens
They seem to be owned by Tyco Electronics. http://www.rfidsolutionsonline.com/content/news/article.asp?docid=afbb9716-4640-4961-ae4f-b50f0d41243b&VNETCOOKIE=NO
Zebra Technologies. They make the printers that print RFID tags. Check out it out at Zebra.com.
IMHO, it would be a good buy now that RFID is moving away from the early adopters into wide spread use.
The stock took a few hits recently as they did not have the kind of growth rate some investors were looking for.
To me it is more of an issue of how long it takes to roll out RFID integration projects.
I have owned the stock for years. It is a great company.
Good luck!
>>>I have been looking for stock opportunities in this field.
Try http://www.optibrand.com