While the lock up on insider shares ended in early April it is my understanding that the insiders were prohibited from trading until 3 days after their EOY Quiet Period. That quite Period ends before the trading day on Monday.
If I am correct, please let me know if I misunderstood the quiet period, there is a potential for the next few days of trading to see sell volume from insiders looking to rebalance/diversify their portfolios and raising cash for their years of hard work.
After that the overhang of uncertain insider selling is gone.
if I am correct about the quite period then late Monday/Tuesday may be a good time to add to your position if you believe in ESTC.