From the article in my previous comment:
>Even assuming the worst case scenario here (let’s assuming somehow the put value was $10 and they held until now and the put is worthless, the max loss is $54 million for a hedge fund with $20 billion AUM, for a max risk of about 0.27%), Melvin Capital is sleeping fine. Because they bought puts, and didn’t short shares directly, their max loss is capped (the premium they paid).