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We conducted a multi-wavelength six-month campaign to observe the Seyfertgalaxy NGC~7469, using the space-based observatories \textit{HST},\textit{Swift}, \textit{XMM-Newton} and \textit{NuSTAR}. Here we report theresults of the spectral analysis of the 7 simultaneous \textit{XMM-Newton} and\textit{NuSTAR} observations. The sources shows significant flux variabilitywithin each observation, but the average flux is less variable among thedifferent pointings of our campaign. Our spectral analysis reveals a prominentnarrow neutral \ion{Fe} K$\alpha$ emission line in all the spectra, with weakercontributions from Fe K$\beta$, neutral Ni K$\alpha$ and ionised iron. We findno evidence for variability or relativistic effects acting on the emissionlines, which indicates that they originate from distant material. Analysingjointly \textit{XMM-Newton} and \textit{NuSTAR} data a constant photon index isfound ($\Gamma$=$1.78\pm0.02$), together with a high energy cut-off$E_{\rm{cut}}=170^{+60}_{-40}$ keV. Adopting a self-consistent Comptonizationmodel, these values correspond to an average coronal electron temperature ofkT=$45^{+15}_{-12}$ keV and, assuming a spherical geometry, an optical depth$\tau=2.6\pm0.9$. The reflection component is consistent with being constant,with a reflection fraction in the range $R=0.3-0.6$. A prominent soft excessdominates the spectra below 4 keV. This is best fit with a secondComptonization component, arising from a \virg{warm corona} with an average$kT=0.67\pm0.03$ keV and a corresponding optical depth $\tau=9.2\pm0.2$.

Multi-wavelength campaign on NGC 7469 IV. The broad-band X-ray spectrum