major

IIRC from earlier skimming when I saw news about this, about 500 Starbucks in the US are unionized, out of about 16,000 locations, so about 97% of their locations are not unionized.

kagis

https://en.wikipedia.org/wiki/Starbucks_unions

As of October 2024, over 11,000 workers at 500 Starbucks stores in at least 40 states in the United States have voted to unionize, primarily with Workers United.

https://www.statista.com/statistics/218360/number-of-starbucks-stores-in-the-us/

Globally famous coffeehouse chain, Starbucks, accounted for 10,158 company-operated and 6,777 licensed stores in the United States in 2024. The number of Starbucks stores has steadily increased over the past decade.

So the strike might be major for a given location, but my expectation is that it’d be fairly limited from the standpoint of corporate headquarters. From the article, which has quotes from the Starbucks organization as a whole, it sounds to me like they’re negotiating with the organization as a whole, not individual locations.