I picked up 500 shares today, on the ticker it looks like I bought them from Instinet, an interesting outfit.  

https://www.instinet.com/

Broker Preference Dark Pool

CBX™ Canada is a low-latency, continuous limit order book offered by Instinet Canada Cross (ICX®) that provides broker/time priority matching in an anonymous or trade-attributed environment. It is a dark pool that does not send lOIs, route orders, or display quotes in public markets. CBX is powered by proprietary matching technology that was designed for speed, performance and reliability.