Nasdaq Riga 

Vaļņu iela 1, Riga LV-1050, Latvia 
Phone: +371 6 721 2431 
Fax: +371 6 722 9411 

Office hours: 
Mon-Thu: 8:30–17:30 (CET +1h) 
Friday: 8:30–16:30 (CET +1h) 
The Nasdaq Riga office is located in the very center of Riga, in the old town, within a 20-minute drive from the Riga Airport and 7 minutes from the harbor.

Nasdaq CSD contact information available here.