stablemate

noun

Etymology: Etymology tree English stable English -mate English stablemate From stable + -mate.

1. One (such as a racehorse) from the same stable.
2. One from the same organization or background.

   “That is why we are stepping in to fill the gap, partnering with the homeless charity Centrepoint, its patron the Duke of Cambridge (rather helpful in getting things done), various tech partners and our former stablemates, The Independent and the London Evening Standard.”