Here is Citron's disclaimer. Maybe they are shorting BZCN?
Disclaimer:Citron does not guarantee in any way that it is providing all of the information that may be available. We recommend that you do your own due diligence before buying or selling any security. At any times the principals of Citron might hold a position in any of the securities profiled on the site. Citron will not report when a position is initiated or covered. Each investor must make that decision based on his/her judgment of the market.
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