A new bulk metallic glass (BMG) with high strength, extensive ductility, and high elastic limit has been reported. The material, Pt57.5Cu14.7Ni5.3P22.5, exhibits a plastic strain of 20% under unconfined compression and bending, which is unprecedented in metallic glasses. This large plasticity is attributed to a high Poisson ratio (0.42), which prevents crack initiation and promotes the formation of multiple shear bands. The BMG also shows a high fracture toughness of approximately 80 MPa m−1/2, which is significantly higher than that of Zr-based BMGs. The material's ductility is due to the formation of a high density of shear bands, which prevent crack propagation. The low shear modulus to bulk modulus ratio (G/B = 0.165) allows for shear collapse before crack formation, leading to the extension of shear band tips rather than crack initiation. The BMG's low glass transition temperature (508 K) and high Poisson ratio suggest it is more ductile than typical BMGs. This study demonstrates that the Pt57.5Cu14.7Ni5.3P22.5 BMG is a promising candidate for structural applications due to its unique combination of mechanical properties.A new bulk metallic glass (BMG) with high strength, extensive ductility, and high elastic limit has been reported. The material, Pt57.5Cu14.7Ni5.3P22.5, exhibits a plastic strain of 20% under unconfined compression and bending, which is unprecedented in metallic glasses. This large plasticity is attributed to a high Poisson ratio (0.42), which prevents crack initiation and promotes the formation of multiple shear bands. The BMG also shows a high fracture toughness of approximately 80 MPa m−1/2, which is significantly higher than that of Zr-based BMGs. The material's ductility is due to the formation of a high density of shear bands, which prevent crack propagation. The low shear modulus to bulk modulus ratio (G/B = 0.165) allows for shear collapse before crack formation, leading to the extension of shear band tips rather than crack initiation. The BMG's low glass transition temperature (508 K) and high Poisson ratio suggest it is more ductile than typical BMGs. This study demonstrates that the Pt57.5Cu14.7Ni5.3P22.5 BMG is a promising candidate for structural applications due to its unique combination of mechanical properties.