Product Update
Is RounderBum Still in Business? (2026 Update)
Is RounderBum from Shark Tank still around in 2026? The deal it made, the sharks who invested, and where to buy RounderBum today.
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Jonathan Diersing built a business around a category most men do not talk about openly: padded underwear designed to enhance shape. He pitched it on Shark Tank anyway, and years later RounderBum has quietly become one of the better selling men's underwear lines on Amazon, a fact that is easy to miss unless you go looking for it.
The Short Answer
Yes, RounderBum is still in business, and by the most recent available reporting it is doing well. The company sells on Amazon, where it has ranked as high as the 4th best selling underwear listing on the platform, and it has expanded into a handful of small men's specialty retail shops as well.
It does not currently sell through a prominent standalone website presence the way some other Shark Tank alumni do, leaning instead on Amazon as its primary retail channel.
The Shark Tank Pitch
RounderBum appeared in Season 9, Episode 18. Jonathan Diersing had founded the company in 2015, manufacturing the product through a partnership with Rounderwear, a major Mexican underwear manufacturer.
He asked for 150,000 dollars in exchange for 10 percent equity in the padded men's undergarment line, betting that a shark's retail relationships could get the product into more physical stores than he could reach alone.
The Deal That Got Done
Kevin O'Leary structured a distinctive deal here rather than a straight equity buy. He invested 150,000 dollars with a 2 dollar per unit royalty that continued until he recouped 300,000 dollars, at which point his stake settled at 5 percent equity, less than half of what Diersing originally offered.
O'Leary's royalty-first structure is one of his signature deal types on this show, designed to get his capital back quickly before settling into a smaller, lower risk equity position.
RounderBum net worth in 2026
No specific net worth figure has been published for Jonathan Diersing or RounderBum as a company in 2026. The most recent sourced revenue figure comes from May 2022 tracking coverage, which reported 3 million dollars in annual revenue and the 4th best selling underwear ranking on Amazon at that time. No newer public figure has surfaced since, so 3 million dollars in annual revenue should be read as the last verified data point rather than a current number.
Kevin O'Leary Became the Marketing Engine
What stands out in RounderBum's post show story is how directly Kevin O'Leary stayed involved after the deal closed. Tracking coverage describes him actively promoting the products on his own social media channels, which generated a real, measurable bump in sales momentum beyond what the episode air date alone typically provides.
The company also used the capital and exposure to expand its product range well past the original men's shaping underwear, adding compression panties for women, compression shirts for men, and compression socks, turning a single novelty item into a broader shapewear and performance apparel line.
The Manufacturing Relationship Behind the Product
Diersing did not build his own factory. He partnered with Rounderwear, described in post show coverage as a major Mexican underwear manufacturer, to produce the padded shaping garments at the scale needed to compete on Amazon's crowded men's underwear category. That kind of established manufacturing partnership, rather than a founder trying to stand up production from scratch, is often the difference between a novelty product that fizzles after its TV moment and one that can actually restock fast enough to keep a top Amazon ranking.
Ranking as the 4th best selling underwear listing on Amazon, as tracking coverage reported in 2022, requires consistent inventory and fulfillment at a scale most Shark Tank consumer products never reach. That ranking alone is a meaningful signal that the manufacturing relationship behind the brand has held up.
Where Things Stand Now
RounderBum pitched in Season 9 out of California, asked for 150,000 dollars for 10 percent, and closed with Kevin O'Leary on a royalty structured deal that settled at 5 percent equity once he recouped his investment.
As of the most recent tracking data, the company was pulling 3 million dollars in annual revenue and ranking among the top selling underwear brands on Amazon, with O'Leary personally helping drive that through his own promotion. If you came here wondering whether the padded underwear brand from Season 9 survived, it did, and it expanded into a broader shapewear line along the way.
Where to buy RounderBum
Still selling as of May 21, 2026. Check today's price and availability.
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See the full RounderBum deal breakdown and term sheet →
