Evolution of magnetoresistance in the magnetic topological semimetals <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mrow> <mml:mi>NdS</mml:mi> <mml:msub> <mml:mi mathvariant="normal">b</mml:mi> <mml:mi>x</mml:mi> </mml:msub> <mml:mi

Magnetic topological semimetals $\mathit{Ln}\mathrm{SbTe}$ ($\mathit{Ln}=\text{lanthanide elements}$) provide a platform to study the interplay of structure, magnetism, topology, and electron correlations. Varying Sb and Te compositions in $Ln\mathrm{S}{\mathrm{b}}_{x}\mathrm{T}{\mathrm{e}}_{2\ensuremath{-}x}$ can effectively control the electronic, magnetic, and transport properties. Here, we report the evolution of transport properties with Sb and Te contents in $\mathrm{NdS}{\mathrm{b}}_{x}\mathrm{T}{\mathrm{e}}_{2\ensuremath{-}x}$, ($0&lt;x&lt;1$). Our work reveals nonmonotonic evolution in magnetoresistance with varying composition stoichiometry. Specifically, reducing Sb content $x$ leads to strong negative magnetoresistance up to 99.9%. Such a strong magnetoresistance, which is likely attributed to the interplay between structure, magnetism, and electronic bands, establishes this material as a promising platform for investigating topological semimetal for future device applications.