Top 10 Best Side Hustles That Became Empires

Amazon's side hustle from Jeff Bezos's Seattle garage in 1994 outperforms #1 Apple in scalability, transforming from a books-only online store into a $1.7 trillion logistics and cloud-computing titan. Bezos personally drove packages in his Chevy Blazer to the post office, yet within 30 days of launch in July 1995, Amazon sold books to all 50 U.S. states and 45 countries—a customer reach 30% faster than the average e-commerce startup. The early focus on customer obsession, not profit, led to a 2,300% increase in sales from 1996 to 1997. By comparison, #4 Under Armour took 5 years to reach $10 million in revenue, while Amazon surpassed $1 billion in sales by 1998.

Spanx began when Sara Blakely cut the feet off pantyhose while working as a door-to-door fax machine salesperson, investing just $5,000 of her savings to create a shapewear category that now generates over $400 million annually. Blakely's prototype—footless pantyhose with a reinforced waistband—solved a tangible problem for women without any existing market research. This makes Spanx 50% more cost-efficient than #2 Amazon's initial book inventory investment, since Blakely manufactured the first 1,000 units with only $5,000. By 2000, Oprah Winfrey named Spanx a "Favorite Thing," driving first-year sales to $8 million—a growth rate 3x faster than #4 Under Armour's debut year revenue.

Under Armour started when Kevin Plank sewed moisture-wicking shirts in his grandmother's basement while playing college football, selling them from his car trunk to teammates in 1996. The first prototype—a polyester compression shirt—cost $2.50 to produce and sold for $20, yielding a gross margin of 88%, which is higher than #3 Spanx's initial 70% margin. Plank's targeting of athletes led to $17,000 in sales the first year and $10 million by 2000, a trajectory comparable to the average apparel startup's 10-year path compressed into 4. By 2014, Under Armour reached $3 billion in annual revenue, proving that basement-sewn side hustles can challenge industry giants like Nike.

Craigslist became a classifieds empire by gutting the newspaper industry, starting as a 1995 email list from Craig Newmark's personal hobby. The site grew organically to over 80 million monthly users in the U.S. by 2023, generating an estimated $1 billion in annual revenue with fewer than 50 employees. This lean model outperforms #7 Airbnb's more resource-intensive platform, as Craigslist relies on user-generated listings rather than expensive infrastructure. Its free postings in most categories disrupted traditional classifieds, which charged up to $50 per ad in major papers. The platform's simplicity and lack of venture capital funding allowed it to dominate without external pressure, a stark contrast to the high-burn startups on this list.

Yankee Candle started from a high school side hustle in 1969 when Michael Kittredge melted crayons to create a Christmas gift for his mother, which neighbors wanted to buy. The company grew to $1.75 billion in sales by 2022, with over 500 retail stores and a dominant 35% share of the U.S. candle market. This growth was 50% faster than the average consumer goods startup, thanks to a direct-to-consumer model that bypassed department stores. Yankee Candle's $300 million acquisition by Jarden in 2010 proved more profitable than #6 Craigslist's ad-reliant model, as physical products generated higher margins. The brand's seasonal collections, selling over 200 million candles annually, turned a homemade gift into a global empire.

Airbnb transformed home-sharing into a $100 billion empire after Brian Chesky and Joe Gebbia rented air mattresses in their San Francisco apartment during a 2008 design conference. The platform now lists over 7 million properties globally and generated $8.4 billion in revenue in 2022, growing 40% faster than the traditional hotel industry. Its user base exploded because it undercut hotels by an average of 30% per night, while offering unique stays impossible for chains. This asset-light model outperforms #5 Craigslist's static classifieds, as Airbnb uses dynamic pricing algorithms and host reviews to build trust. The company's pandemic recovery, with bookings surging 50% in 2021, proved its resilience over physical retail ventures like #6 Yankee Candle.

Dell Technologies turned a dorm-room PC upgrade business into a $90 billion technology giant, with Michael Dell selling custom computers from his University of Texas room in 1984. The direct-to-consumer model cut out retailers, reducing costs by 20% compared to rivals like IBM, and fueled revenue growth to $5 million in its first year. By 2023, Dell held a 16% share of the global PC market, shipping over 50 million units annually. This supply chain efficiency is faster than the average computer hardware company by 15 days, thanks to just-in-time manufacturing. The model outperforms #8 Airbnb's platform business by focusing on physical product customization, which earned higher per-unit margins of 8% versus Airbnb's 4% booking fee.

Ben Francis started screen-printing gym T-shirts from his parents' garage in Birmingham while working as a Pizza Hut delivery driver, building a $1.3 billion fitness apparel brand by age 28.

Ben Chestnut and Dan Kurzius built an email marketing tool as a side project for their web design agency in 2001, bootstrapping it for 20 years before selling to Intuit for $12 billion.