The upper limit on the PBH fraction f_PBH at the 95% confidence level as a function of PBH mass M_PBH in the range [1, 10⁵] M_⊙, derived from the current CHIME/FRB Catalog 2 under the assumption of no lensing FRBs. The subplot presents an approximate constraint on the PBH parameters under the hypothesis that FRB 20190131D and FRB 20211115A are lensed signals produced by PBHs. Other constraints are compiled from existing review (B. Carr et al. 2026): these include limits from microlensing surveys (Microlensing), the merger rate of binary black holes (GWs), the effect of accretion (Accretion), dynamical effects (Dynamical), and the imprint of PBHs on a large-scale structure (LSS).