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1 put = 100 shares of the stock. Without knowing the put details it's hard to know the extent of their loss. But your total could be close to what they lost just on GME.

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I understand basic options. They listed only long puts in 13F, the max they could lose is the premium they paid. So there must be some other securities that they didn't disclose (mostly short calls as @tchanglington mentioned) which resulted in the loss. I was asking if hedgefunds can disclose selectively? If so that can be exploited in so many ways.

When you buy a put, you are only risking the cost of the put. Unlike a short call or short put.

Yes 1 put contract is technically the right to sell 100 shares at the strike price of the put.

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