impossible to say. we dont know the stop size.
but the notional value of each position is around 20 million usd.
~0.5 pip commission x 10$ per pip, per full lot = 5$ commission, per lot.
1000 / 5 = 200 lots
200 lots x 100,000 = 20 million
assuming risk per trade of 2%, account size can be guessed at
10 pip stop = 200 lots x 10 pips x 10 dollars per pip = 20,000 / 2% = 1 million account value
50 pip stop = 200 lots x 50 pips x 10 dollars per pip = 100,000 / 2% = 5 million account value
probably between 1 and 5 million