The stock is up 500% from its IPO price of $25 per share. Beyond Meat has an outstanding short position valued at around $813 million, or roughly 51 percent of the stock's float, according to financial analytics firm S3 Partners. Short sellers took a $229 million loss last Friday alone. Tyson Foods shares traded up 2.9% at $84.30 in Thursday's pre-market session. Beyond Meat shares traded down 3.4% at $137.10. Related Links: Beyond Meat Taking A Bite Out Of Short Sellers There's A Beyond Meat Shortage At Freebirds Restaurants