I got this from someone in Hoffman's (TTM's) trading room -
14 July. Hoffman started buying TF on a dip at about 838. Bought 1 contract. He normally goes for 7 to 10 ticks. Got a bounce to 3 ticks up. Not enough profit. Then TF continued down. Hoffman began to Martingale up in size (average down in price) as TF continued down. As his size grew there were a number of times he could have taken a scratch trade or a small ($1,000-$3,000) profit or loss along the downward path. After about an hour, his position was up to 852 contracts, showing a $200,000 loss ($8,520 a tick) . He was trying to add more when his broker's risk system blocked his buy side, notified him of a margin violation, and then closed his position at the market for a $312,000 loss.
14 July. Hoffman started buying TF on a dip at about 838. Bought 1 contract. He normally goes for 7 to 10 ticks. Got a bounce to 3 ticks up. Not enough profit. Then TF continued down. Hoffman began to Martingale up in size (average down in price) as TF continued down. As his size grew there were a number of times he could have taken a scratch trade or a small ($1,000-$3,000) profit or loss along the downward path. After about an hour, his position was up to 852 contracts, showing a $200,000 loss ($8,520 a tick) . He was trying to add more when his broker's risk system blocked his buy side, notified him of a margin violation, and then closed his position at the market for a $312,000 loss.