$MRSN #Mersana Therapeutics Mersana Therapeutics Inc: 2 directors bought: Two Directors at Mersana Therapeutics Inc bought 3,984,266 shares at between 5.590USD and 5.993USD. The significance rating of the trade was 100/100. Is that… https://t.co/BwwXbIkFjA #equity #stocks https://t.co/MQ7k4OQ0wr