We consider a continuous-time financial market that consists of securities available for dynamic trading, and securities only available for static trading. We work in a robust framework where a set of non-dominated models is given. The concept of semi-static completeness is introduced: it corresponds to having exact replication by means of semi-static strategies. We show that semi-static completeness is equivalent to an extremality property, and give a characterization of the induced filtration structure. Finally , we consider investors with additional information and, for specific types of extra information, we characterize the models that are semi-statically complete for the informed investors  .
We consider a continuous-time financial market that consists of securities available for dynamic trading, and securities only available for static trading. We work in a robust framework where a set of non-dominated models is given. The concept of semi-static completeness is introduced: it corresponds to having exact replication by means of semi-static strategies. We show that semi-static completeness is equivalent to an extremality property, and give a characterization of the induced filtration structure. Furthermore , we consider investors with additional information and, for specific types of extra information, we characterize the models that are semi-statically complete for the informed investors . Finally, we provide some examples where robust pricing for informed and uninformed agents can be done over semi-statically complete models .
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. Finally, we provide some examples where robust pricing for informed and uninformed agents can be done over semi-statically complete models