Yavuz, Tugba2026-01-312026-01-3120251225-293X2288-6176https://doi.org./10.5831/HMJ.2025.47.2.107https://hdl.handle.net/20.500.12662/10850In the organised paper, new comprehensive subclasses of spirallike functions are introduced and investigated. We derive sharp coefficient estimates for spirallike functions which are defined by the principle of the subordination. Further, membership relations for functions belonging to these subclasses are obtained. These results also include earlier results about certain subfamilies of spirallike functions.eninfo:eu-repo/semantics/closedAccessUnivalent FunctionsSpirallike FunctionsSubordination PrincipleSharp Coefficient EstimatesArticle10.5831/HMJ.2025.47.2.107118210747WOS:001513653100010Q4