Meaty borrowing fees are keeping short sellers from adding to their bearish positions in Beyond Meat’s stock.

Though short sellers were to quick bet against the shares after they soared in their initial days of trading, short activity has quieted down more recently, in part because the stock has become so expensive to borrow.

See also: 5 things to know about the plant-based meat maker

Beyond Meat shares BYND, -1.77% now carry a stock-borrow rate of about 68%, according to data from S3 Partners, a financial technology and analytics firm, making it so would-be short sellers would have trouble achieving an attractive return on their investments after taking into account the borrowing cost.

A borrow fee of 68% makes Beyond Meat the most expensive stock to short of all U.S. stocks with over $100 million in short interest, Ihor Dusaniwsky, managing director at S3, told MarketWatch. Newly public Lyft Inc. LYFT, -0.74% ranks fifth with a 26% fee, which has come down in recent weeks.

“With much of its stock held by internal holders or in non-lending retail hands, coupled with a relatively small float, there is little hope of a significant amount of stock landing in lending programs until its 180-day lockups expire on Oct. 29,” Dusaniwsky said.

The maker of plant-based meat currently has the 14th-largest short interest in the food-products sector, recently crossing the $500-million threshold, but its “quick rise up the league tables” has been stalled by the high borrow costs and the paper losses that shorts have racked up thus far, Dusaniwsky said.

Shorts have seen mark-to-market losses of 20% on their short bets since the IPO. Beyond Meat’s stock is currently up nearly 300% from its IPO price of $25.

Read: Beyond Meat CEO wants to make traditional protein from animals ‘obsolete’

Analysts recently initiated coverage of Beyond Meat, with J.P. Morgan assigning the stock an overweight rating and a $97 price target while other analysts cautioned that the stock looked fairly priced after its massive post-IPO rally and set lower targets.