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Immunoglobulin heavy chain (IGH) enhancer translocations drive multiple myeloma (MM), but routine diagnostics resolve only 32 to 38% of cases. Here, we introduce TransFinder, a multiomic pipeline integrating SMRT long-read sequencing (LRS), Hi-C, H3K27ac ChIP-seq/CUT&Tag, and RNA-seq to systematically resolve cryptic translocations and their hijacked oncogenes by deconvoluting enhancer-promoter neo-loops at rearrangement breakpoints. Applied to MM, TransFinder identified that t(16;22)(q23;q11), a canonical translocation known to activate MAF, also hijacks enhancers to activate RAB36. It further uncovered previously unrecognized t(5;8)(q35;q24) and t(1;22)(q25;q13), which activate MYC and CBX7, respectively, through chromatin topology rewiring. CRISPR-Cas9-engineered t(1;22)(q25;q13) recapitulated CBX7 induction, and pharmacological inhibition of CBX7 suppressed myeloma cell proliferation. Beyond MM, TransFinder identified enhancer hijacking in chronic myeloid leukemia, where t(9;22)(q34;q11) repositioned an enhancer to activate BCR-ABL1, and pancreatic ductal adenocarcinoma, where t(2;12)(p24;q24) hijacked an enhancer to activate SDC1. Linking 3D genome architecture to oncogene activation, TransFinder decodes oncogenic structural variants and their trans-activities, establishing clinically actionable dependencies of noncoding drivers in malignancies.