Abstract: The present invention refers to novel liquid pharmaceutical high-concentration formulations particularly suitable for subcutaneous administration comprising human antibodies against coagulation factor FXIa as active ingredient, especially those described in WO2013167669, which are stable as liquid formulations over a long period. The invention also refers to lyophilizates of the specified liquid formulation with reduced reconstitution time and also to the use of these formulations in the therapy and prophylaxis of thrombotic or thromboembolic disorder.