I don't give stock advice all that often. However, I called this one well ahead of it tripling from single-digit lows. Investors will misread Apple's iTunes Radio gains, which I expect to come, and Pandora's moderated growth, which I also expect to continue, for trouble. But again, they're missing the real story, the next chapter in Pandora's evolution just as they did with mobile advertising and such. They are missing Pandora's ability to change the music industry and open up new lines of revenue for itself, its partners, particularly artists of all sizes, and sign advertisers to deals that focus on key local markets and demographics.
So, if I could own Pandora (TheStreet's insider trading policy prevents me from owning individual stocks) and I had profits on paper, I would sell now, wait for the inevitable Apple-related dips and buy modest amounts on any dives below $20 a share. If it never gets that low, who cares? You're much better off having played it conservative, taken profits and protected yourself so you can live to fight another day.