More specifically, Renaissance Technologies was the largest shareholder of Unum Therapeutics Inc. (NASDAQ:UMRX), with a stake worth $0.1 million reported as of the end of September. Trailing Renaissance Technologies was Millennium Management, which amassed a stake valued at $0.1 million. Citadel Investment Group was also very fond of the stock, becoming one of the largest hedge fund holders of the company. In terms of the portfolio weights assigned to each position Millennium Management allocated the biggest weight to Unum Therapeutics Inc. (NASDAQ:UMRX), around 0.0001% of its 13F portfolio. Renaissance Technologies is also relatively very bullish on the stock, earmarking 0.0001 percent of its 13F equity portfolio to UMRX.