In four judgments of 26 June 2012, case refs.: XI ZR 259 / 11, XI ZR 316 / 11, XI ZR 355 / 10 and XI ZR 356 / 10, the Federal Court of Justice (BGH) has again stated its position on the question of when there is a duty to disclose commission. In all four cases the investors purchased certificates from the same defendant bank to invest different amounts and these certificates turned out to be largely worthless following the insolvency of the issuer (Lehman Brothers Treasury Co. B.V.) and the guarantor (Lehman Brothers Holdings Inc.) in September 2008.