Grifols Denies Gotham Claims as Short Seller Triggers 26% Rout

Grifols SA is pushing back against a report by Gotham City Research LLC that alleged the company has overstated profit and misstated its accounting, which sparked a record one-day selloff in the shares.

The Barcelona-based blood plasma company said all the transactions mentioned in the short seller’s report were recorded and presented to regulatory authorities in Spain and the US. “There’s no new information that can be considered hidden,” Grifols said in a filing on Tuesday.

The accounting treatment given to deals such as the sale of Haema and Biotest Pharmaceuticals Corp. to Scranton Enterprises BV, a vehicle related ...