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The purpose of this paper is to examine the financing of companies belonging to the SBF 120 index over the 2010–2018 period. The research question is whether the use of hybrid securities has an impact on the financial structure of groups under IFRS (International Financial Reporting Standards). Two categories of hybrid securities are used: those belonging to the TSDI family (subordinated securities of indefinite duration) and those belonging to the CB family (convertible bonds). Our study highlights that: (i) only 53 percent of listed companies used a hybrid instrument over the period studied; (ii) there is a difference in the accounting classification of these instruments in 25 percent of cases, between the consolidated financial statements disclosed under IFRS and the parent company’s stand-alone financial statements published under the French GAAP; (iii) the overall amount of hybrid securities issued is too small to reveal an impact on financial structures and on the accounting classification by issuers.