Dropbox saw its best day since going public Thursday, with massive trading volumes sending shares up roughly 20 percent at their peak.
The stock closed 14 percent up at $36.12, after hitting an all-time high of $38.09 earlier in the day. Shares traded at 10 times their normal trading volume.
Thursday's surge lifts Dropbox roughly 80 percent over its IPO price of $21.
Dropbox debuted on the public markets in March, soaring 35 percent on its first day. The company offers cloud storage for personal and enterprise use.