Current studies have revealed that the maximal topological charge of Weyl points (WPs) is four, which gives rise to many charge-number-dependent properties, such as Landau levels, quantized circular photogalvanic effect, and multiple Fermi arcs. However, charge-four Weyl materials (termed C4-WMs) remain scarce. Here, we employ symmetry analysis and first-principles calculations to systematically identify C4-WMs. In the absence of spin-orbit coupling, we find that 13 space groups and 40 candidate materials can host C4-WPs. In ferromagnetic (FM) systems, the two spin channels decouple, allowing each to be treated as a spinless system, and C4-WPs can also emerge. We identify a total of 14 FM C4-WMs. For all 40 candidates (including FM ones), we summarize their crystallographic and magnetic parameters, as well as the positions of C4-WPs in momentum space and energy space. We also take nonmagnetic material ${\mathrm{Bi}}_{12}{\mathrm{PO}}_{20}$ and FM material ${\mathrm{K}}_2{\mathrm{CuPbN}}_6{\mathrm{O}}_{12}$ as examples, analyzing their electronic properties, especially their surface states and topological phase transitions. Our findings establish a platform for experimental exploration and further study of physical properties for C4-WPs.

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• Ferromagnetism
• Surface states
• Topological phase transition
• Weyl fermions
• Topological materials