1449 3rd Edition

How many companies have achieved UL 1449 3rd Edition status?

Many. UL1449 is the safety and performance standard for Transient Voltage Surge Suppressors and is specific to manufacturers of Transient Voltage Surge Suppressors.

Who are they?

I would start by looking at manufacturers of Transient Voltage Surge Suppressors (of which there are many).

http://www.globalspec.com/reference/3303/UL-1449-Rated-Surge-Protection

http://www.google.co.nz/search?hl=en&num=100&q=Transient+Voltage+Surge+Suppressor+manufacturers&meta=

Try including UL1449 and the specific type of product applicable to your search (I am assuming you are after UL1449 approved parts for a job or tender) in the search.