person is a large trader, “a registered broker-dealer need take into account only transactions in NMS securities effected by or through such broker-dealer.” Rule 13h-1(a)(9). 5. See Phase Three Extension Order, supra note . 3 (extending the Phase Three compliance date until November 1, 2017). See also Phases Two and Three Order, supra note 3, 78 Large Trader Identification Number 3, Record Sequence Number Seven, Field Position 28 to 40 Firms should use this record to submit the Large Trader Identification Number. This information is requested under the approved SEC Large Trader Reporting Rule (SEA Rule 13h-1) requirements.