A small private equity fund devoted to the growth of the marijuana industry is getting a big boost from its stake in Tilray.

Shares of Tilray nearly doubled at one point on Wednesday in volatile trading that included multiple trading halts. But it was the third straight day of gains. On Tuesday, the company said it had the okay from the U.S. Drug Enforcement Administration to import medical marijuana for a clinical trial in California. The stock only began trading publicly in July.

Seattle-based Privateer Holdings has at least a 76 percent stake in Tilray, according to FactSet. Earlier this year, the fund raised $100 million, bringing the total amount it has raised since 2010 to $200 million. Privateer has disclosed investments in four cannabis-related companies, including Tilray and Leafly, Marley Natural and The Goodship.