I guess this will answer your question, I got this from SH forum.
APCSF is the US broker symbol for trading the Canadian stock. US brokers cannot directly buy APH.V since it is on the Canadian exchange. So it has a US listing. The broker then buys APH.V thru APCSF. The volume represents only the US sales for APH that were purchased thru the US symbol APCSF. "does anyone on the board know why we have an OTC trading symbol for Alda under "APCSF" which appears to have trading volume, it accompanies the same news releases as APH on the venture exchange. If anyone has insight, perhaps they can post a reply."
