A sponge company has far and away become the biggest "Shark Tank" success story. Over the past three years, Scrub Daddy has brought in a total of $75 million in revenue, according to investor Lori Greiner.
Greiner made a deal with its founder and CEO Aaron Krause in Season 4 for $200,000 in exchange for 20% equity. At that point, Krause had struggled to reach $100,000 in sales over 18 months, but Greiner saw great potential in the company's signature offering, a proprietary smiley-faced sponge that was more durable, hygienic, and effective than a traditional one.
She helped Krause expand his product line and brought them onto QVC and stores like Bed Bath & Beyond, where they have become bestsellers.