French glassmaker Saint-Gobain said on Tuesday that its Verallia glass packaging unit had taken the first step towards an initial public offering by filing documents with the French AMF regulator. "Saint-Gobain is thus pursuing the process announced last October with regards to the contemplated initial public offering of Verallia, subject to market conditions and to the AMF's approv 1634476033 of the offer prospectus," Saint-Gobain said in a statement.