Hedge fund manager Whitney Tilson, the founder of Kase Capital, pitched two new ideas at the Robin Hood Investors Conference in New York on Monday.
The newest long in his portfolio is the low-cost airline Spirit Airlines.
But Tilson, who gained attention for his short of the hardwood retailer Lumber Liquidators, is also betting against the furniture company Wayfair.
Tilson said he had five items of Wayfair's furniture tested for formaldehyde and, of the three he had received results on, two showed toxic levels.
Of the products Tilson had tested, one is being sold on the websites for Walmart, Kohl's, Staples, and Shop Your Way.
Tilson is the one who flagged the Lumber Liquidators formaldehyde issue for CBS' "60 Minutes." Since that report aired in March, the stock has collapsed by more than 72%.
We have reached out to a Wayfair representative for comment. So far, Wayfair's shares have held up under the scrutiny.
Here's Tilson's full 103-slide presentation:
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