The wildest stock market story of the day once again involved a Nanaimo-based cannabis producer.

Tilray shares opened at US$233.58 after a rapid overnight run-up.

By early afternoon, they peaked at US$300 before plunging to a low of US$151.40.

Then a late-day rally pushed the stock to US$214.06 at the close, up 38.12 percent from yesterday's close.

Tilray's market capitalization is US$19.94 billion, which works out to $25.77 billion Canadian.

That puts it well ahead Restaurant Brands International's market cap of $19.2 billion. RBI owns Tim Hortons, Burger King, and Popeyes Louisiana Kitchen.

When Tilray was ready to launch its initial public offering on NASDAQ in July, it priced the shares at US$17,

The value has since risen by more than 1,250 percent.