As I was growing up, these were the women I wanted to be: triumphant at the highest levels of commerce, assailing stereotypes of what a successful businessperson looked like, with smarts and vision and the will to outwork everyone in sight. Being a “one or only” in the room where it happens, I knew, was part of the bargain, the number of black or female fellow travelers diminishing with each level scaled, like oxygen at the planet’s highest peaks. As a black woman who spent years working in finance and technology, I’m both giddy to know that it’s possible to fill a room with black female entrepreneurs who have raised $1 million or more in outside capital, and acutely aware of the reasons that it’s still only one room.

All successful entrepreneurs imagine a problem, a product, and a market. But because the default founder in Silicon Valley is male, and white or Asian, a black woman must also “envision herself being the person creating the product or service that is in the world,” says Jessica O. Matthews, founder and C.E.O. of the renewable-energy start-up Uncharted Power —and then get funders to buy into that vision. The tech industry is an exercise in controlled failure, with as many as 81 percent of all funded start-ups washing out before exiting; “fail fast” is part of the religion. But black women must guard against even the hint of failure with every arrow in the quiver, lest naysayers see a shortcoming as evidence that blacks or women are categorically unsuited for the business.

(1) Lisa Skeete Tatum, co-founder and C.E.O., Landit. (2) Heather Hiles, founder and former C.E.O., P athbrite (sold company to Cengage Learning in 2015). (3) Marla Blow, founder and C.E.O., FS Card. (4) Helen Adeosun, co-founder and C.E.O., Care Academy. (5) Morgan DeBaun, founder and C.E.O., Blavity. (6) Jean Brownhill, founder and C.E.O., Sweeten. (7) Marah Lidey, co-founder and co-C.E.O., Shine. (8) Kristina Jones, co-founder, CourtBuddy. (9) Sherisse Hawkins, co-founder and C.E.O., Pagedip. (10) Etosha Cave, founder, Opus 12. (11) Tanisha Robinson, founder, Print Syndicate. (12) Catherine Mahugu, founder, Soko. (13) Alicia Thomas, co-founder and C.E.O., Dibs. (14) Kellee James, founder and C.E.O., Mercaris. (15) Viola Llewellyn, co-founder and president, Ovamba. (16) Reham Fagiri, co-founder and C.E.O., AptDeco. (17) Camille Hearst, co-founder and C.E.O., Kit. (18) Alexandra Bernadotte, founder and C.E.O., Beyond 1 2. (19) K. J. Miller, co-founder, Mented Cosmetics. (20) Nicole Neal, co-founder and C.E.O., Noodle Markets. (21) Amanda E. Johnson, co-founder, Mented Cosmetics. (22) Cheryl Contee, co-founder and strategic adviser, Attentive.ly. (23) Asmau Ahmed, founder, Plum Perfect. (24) Star Cunningham, founder and C.E.O., 4D Healthware. (25) Jewel Burks, co-founder and C.E.O., Partpic (sold company to Amazon in 2016). (26) Jessica O. Matthews, founder and C.E.O., U ncharted Power.

Still, these women (the 26 founders shown here completed their $1 million or more in fund-raising before November 15, 2017, according to start-up accelerator DigitalUndivided) are the most visible faces of a revolution. Over the last two decades, black women have become the fastest-growing demographic of entrepreneurs, owning nearly 60 percent of all black businesses. And if current efforts to diversify the STEM (science, technology, engineering, and math) workforce have their intended impact, the number and scope of founders should increase as well: more than 90 percent of founders of “unicorns”—companies with a valuation of $1 billion or more—previously worked at top tech firms. That will mean more chances of finding “someone to identify with—someone to root for and aspire to be,” as Marla Blow, founder and C.E.O. of the credit-card venture FS Card, has put it. Representation matters, even in this rarefied air.

CORRECTION: An earlier version of this story misidentified the name of Jessica O. Matthews's renewable-energy company. It is Uncharted Power.