Nikola threatens Hindenburg with litigation; short-seller 'welcomes it' Nikola threatens Hindenburg with litigation; short-seller 'welcomes it' September 11, 2020 dzadmin Comments 0 Comment Nikola said it retained corporate litigator Kirkland & Ellis. It also said it plans to bring the actions of the activist short-seller, together with evidence and documentation, to the attention of the U.S. securities regulators.