Jim Simons acquired 832k Spero Therapeutics shares worth $1.78M. That's 0.00% of their equity portfolio (2158th largest holding). The investor owns 2.53% of the outstanding Spero Therapeutics stock. The first Spero Therapeutics trade was made in Q3 2018. Since then Jim Simons bought shares fifteen more times and sold shares on eight occasions. The investor's estimated purchase price is $2.22M, resulting in a loss of 20%.