Among those who have exited are Head of Production Martin Buckett.
She will also work with external companies on other projects.
Company chief Ross is known for helming BBC cooking juggernautMasterChef UKfor 12 years while at Shine TV.
Mary Berry: Love to CookBBC/Sidney Street/Endemol Shine UK/Craig Harman
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A rep for Banijay UK confirmed the news.
Sidney Street is not the first Banijay UK label in the news this week.
This has put its 18-strong staff at risk of redundancy.
A rep confirmed the story.
The Sidney Street team has so much to be proud of, said Ross.
Banijayacquiredanother super-indie giant, Endemol Shine Group, in 2020.
Banijay UKs unscripted labels include Dragonfly, DSP, Initial, Remarkable and Shine TV.
