Mirror Entrepreneur Sold Her Fitness Startup to Lululemon. Letting Go Meant Sticking Around.

When Brynn Putnam sold her company for $500 million, she couldn’t walk away from what she created. She joins a list of prominent entrepreneurs who cashed in without checking out.

Brynn Putnam, who founded Mirror, now has a new boss following her $500 million sale to Lululemon Athletica Inc.

Photo: MIRROR

Brynn Putnam, a former ballerina, knows something about pivoting. That skill was put to the test this year when the 37-year-old entrepreneur finally got a boss.

Ms. Putnam created the Mirror, an at-home fitness product that streams workout classes to a reflective glass propped against the wall. As the pandemic increased the demand for such gadgets, Ms. Putnam adjusted by deciding to sell Mirror to Lululemon Athletica Inc. for $500 million.

Ms....

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