Throughout her career, she has sought stocks she thinks can keep increasing revenue by at least 15 percent a year. Her mantra is: “Revenue growth, revenue growth, revenue growth,” she said.

Favorite holdings can stay in the fund for years: Mercadolibre, an Argentine e-commerce outfit, has been there for a decade. That stock was lately one of only 31 in the fund, compared with 157 for the average actively managed United States stock fund tracked by Morningstar.

Ms. Zevenbergen says she prefers companies that are run by their founders. As an example, she pointed to Microsoft. The stock soared while one of the founders, Bill Gates, steered the company but languished under his successor, Steven A. Ballmer. What’s more, boards of directors are typically not as patient with outsider C.E.O.s, and long-term investments require patience, she said.

Her liking for founder-led outfits is part of the reason her fund has owned Tesla, the electric-car maker led by Elon Musk, since its 2010 initial public stock offering. Despite Tesla’s recent operational problems, she said: “Elon Musk is doing things people said couldn’t be done — and he’s up against an old, established industry and organized labor.”

Ms. Zevenbergen added: “You can often get a C.E.O. with an M.B.A. from Harvard, but do they have the passion to run the business that the founder had?”