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securities is to be translated by titoli
an "obbligazzione"=bond is already a fixed income security. Even when the bond interest rate is a variable one, still you say it belongs to the fixed income category because the variable interest is much less variable than the dividends from stocks for instance which are unpredictable to a huge extent. A reference below:
L'investimento è ripartito equamente (ma non sempre al 50%) tra titoli a redito
fisso e variabile, per conciliare l'esigenza di ottenere un reddito periodico ... www.dottfileccia.it/Finanza/Fondi5.htm - 3k