Looks like investors were very hungry for this one and the high jump on the first date indicates that they are viewing Pagerduty in the same market segment as MongoDB and Twilio. Same set of customers, expanding market as each of those customers increase their server foot print.
Also with the 50% pop looks like investors were ready to give them future growth so the company definitely left money on the table with their IPO pricing.
But none the less amazing IPO. Hopefully stock stays in the range on Friday.