Single-stock ETFs seem like an oxymoron: An investing vehicle that usually contains an entire portfolio reduced to just a single company? But whatever skepticism existed when this type of ETF — which are either leveraged or inverse — first launched two years agoCHTK has abated. Traders are hooked on this type of ETF "hot sauce," even if it sounds a lot like gambling. Assets in single-stock ETFs have doubled in assets this year, to more than $5 billion. The most popular such ETF, GraniteShares 2x Long NVDA Daily ETF ($NVDL), takes Nvidia's performance — an incredible upward trajectory of late — and doubles it. (Its daily volume usually exceeds most blue-chip stocks.) You can also go short with the GraniteShares 2x NVDA Daily ETF ($NVD). 

On this episode of Trillions, Eric Balchunas and Joel Weber explore single-stock ETFs with Will Rhind, the founder and CEO of GraniteShares, which currently has about a dozen such offerings. They discuss how the ETFs work, who uses them, what the risks are, why enthusiasm for a given stock is so important, and where this interesting new category — and the "Vanguard-free zone" — could go from here.