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B2 0954+25A, detected by the  Fermi  satellite, is a blazar with interesting observational properties: it has been observed to transit from a jet‐dominated to a disc‐dominated state; its radio spectrum appears flat at all observing frequencies (down to 74 MHz); optically, the Hβ line profile is asymmetric. The flatness of the radio spectrum suggests that the isotropic emission from radio lobes is very weak, despite the large size of its jet (≳500 kpc). Its broad‐band spectral energy distribution is surprisingly similar to that of the prototypical γ‐ray, radio‐loud, type 1 narrow‐line Seyfert (γ‐NLS1) galaxy PMN J0948+0022. In this work, we revisit the mass estimates of B2 0954+25A considering only the symmetric component of the Hβ line and find (1–3) × 10 8  M ⊙ . In light of our composite analysis, we propose to classify the source as a transition object between the classes of flat spectrum radio quasars and γ‐NLS1 galaxies. A comparison with two members of each class (3C 273 and PMN J0948+0022) is discussed.

B2 0954+25A: a typical Fermi blazar or a γ‐ray loud Narrow Line Seyfert 1≟