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Tencent, Bytedance, Huawei, DJI, SenseTime, ZTE? At least back in ~2015 when I visited, it was definitely a major startup hub.

Shenzhen is home to a lot of startups. some of them become unicorns, many of them you'll never hear about unless you're ij that specific market because they're B2B or get rebadged in Western markets. But there's a tooon of startups in every domain there. Basically most of the ebike market for example will use a lot of components from Shenzhen startups, and so do most electronics and a lot of software and e-commerce.

don't know any but personally since it's not in the anglosphere you're bound to miss a lot of companies doing incredible stuff. just like it's easy to miss a bunch of small tech companies in the us doing incredible stuff whether for the right reasons or not.