Tsingtao: Video shows Chinese beer worker urinating into tank
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Tsingtao said on Friday that it "attached great importance" to the online video, and the police had started an investigation.
The BBC has reached out to the company for comments.
Chinese social media has been shocked by the clip, as the brand is hugely well-known both at home and abroad.
"A piss that will ruin a lot of money, this worker has done some real damage here," a top-liked comment on X-like platform Weibo reads.
"Good thing I don't drink beer - but it's unimaginable if this brand is finished because of this," one user said.
"Is this the first time though?" another comment reads.
Shares in Tsingtao Brewery fell sharply when the Shanghai Stock Exchange opened on Monday morning but were trading broadly flat by the afternoon.
The Hong Kong market, where Tsingtao shares are also listed, was closed on Monday for the Chung Yeung Festival holiday.
