Microsoft’s AI cloud business is concentrated around a small set of major customers, according to Bloomberg Technology’s Tech In Depth newsletter. Bloomberg’s headline identifies OpenAI, TikTok and Meta as the key names in that customer concentration. The provided Bloomberg summary says “a small group dominates” Microsoft’s cloud customer list. In the newsletter text supplied, Bloomberg says Brody Ford reports on the “narrow scope of major customers” for Microsoft’s AI cloud business. The material does not include revenue figures, contract values, usage shares, or terms for any of the named companies. It also does not specify whether the concentration refers to current usage, booked commitments, future capacity reservations, or another internal customer measure. That distinction matters because AI cloud demand can look different depending on the metric. The provided Bloomberg item does not quantify how large the imbalance is or how Microsoft measures it. For now, the supported takeaway is narrower: Bloomberg reports that Microsoft’s AI cloud customer base is heavily concentrated, and that OpenAI, TikTok and Meta are central to that concentration. The report does not, from the supplied material, support broader claims about Microsoft’s overall cloud business, profitability, pricing power, or customer risk beyond that scope. Who benefits: OpenAI, TikTok and Meta are central customers for Microsoft’s AI cloud business, according to Bloomberg. Who's exposed: Microsoft is the exposed party if AI cloud demand is materially dependent on a small number of customers. The supplied material does not quantify that exposure.