Poke here. I've been big on Poke for a while, there was a food truck serving "sushi burritos" and poke every week at my office going back to 2011, and I lived off that stuff.
Now, last 18 months, the brick&mortar poke scene has exploded in Los Angeles. They're everywhere. A new one or five opens every week. I went to one out on the edge of the Valley on Saturday, when I was in the neighborhood, it was in a tiny little corner of an out-of-the-way strip mall, and the lines were out the door.
Looks like they're super cheap and super profitable to run. Couple of rice makers and you're in business... since you don't have to worry about cooking the fish. Less training for the staff than a Subway or Chipotle. Been growing out of LA into Houston and NYC in the last six months.
Sadly, a quick search didn't turn up any that are publicly traded, or, I'd drop a few racks into them.