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Arm is a British company and their name comes from their "Acorn RISC Machine". In British English, they tend to only capitalize the first letter of an acronym

Arm is a British company and their name comes from their "Acorn RISC Machine". In British English, they tend to only capitalize the first letter of an acronym if it's read as a word. So for example the British Broadcasting Corporation is the "BBC" (pronounced B-B-C), but the North Atlantic Treaty Organization is "Nato", and the US National Aeronautics and Space Agency is "Nasa". At this point the formal name of the company is "Arm Ltd" even though their processors still go by "ARM".

penguin_booze 5y ago
This is incorrect. The casing has nothing to do with being British. Until some time ago, it was ARM proper, whilst still being British. Although, the name was an initialism of 'Acorn RISC Machines', they later went by just the name, without any connotation to its origins. Some time ago, the management decided that the branding wasn't hip enough, and went for a rebranding (website, social media etc.), with lower case arm used in documents and as logo. But when used as a noun, they use Arm instead. Source: I used to work there when this happened.