SUMMARY

There are TWO sub-branches of UBS - one in NYC and another in China - with similiar names.

China: UBS Securities Co, Ltd.
NYC: UBS Securities So, LLC.

UBS Securities Co. Limited
First foreign-invested fully-licensed securities firm in China, 51% owned by UBS AG
https://www.ubs.com/cn/en/ubs-securities.html
https://www.scmp.com/infographics/economy/china-economy/article/2175939/china-allows-ubs-take-controlling-stake-local (see CAP previous post)
Current shareholders: UBS AG (51%); Beijing Guoxiang Property Management Co., Ltd (33%); Guangdong Provincial Communication Group Co., Ltd (14.01%); and China Guodian Capital Holdings Ltd (1.99%).
https://www.ubs.com/cn/en/ubs-securities.html

UBS Securities, LLC
UBS Securities LLC operates as the investment banking division of UBS, providing investment and broker-dealer services worldwide. The Company provides services such as equities sales and trading, fixed income products, and treasury products. UBS Securities offers financial services to individual and institutional investors.
Address: 1285 Avenue Of The Americas New York, NY 10019 United States