 De Group Property Simon, 10 Owner at Life Time Group Hldgs NYSE:LTH, made a large insider buy on October 12, according to a new SEC filing. What Happened: A Form 4 filing from the U.S. Securities and Exchange Commission on Tuesday showed that Simon exercised options to purchase 611,834 shares of Life Time Group Hldgsat prices ranging from 0.00 to 18.00. 