The three strains present in Norum™ were initially selected by their excellent to good relative enzyme activity (REA) production score for amylase, protease, lipase, phytase, cellulase, β-glucanase, and xylanase. Further studies confirmed that the three isolates also showed an antibacterial activity, Gram-positive and Gram-negative poultry pathogens. Norum™ (Eco-Bio/Euxxis Bioscience LLC) is a spore direct-fed microbial (DFM). The isolates were screened and selected based on enzyme production profiles. Moreover, in chickens fed high non-starch polysaccharides, this DFM demonstrated to reduce digesta viscosity, bacterial translocation, increase performance, bone mineralization, and balance the intestinal microbiota. In the present study, we present the whole-genome sequence of each of the three isolates in Norum™, as well as the synergistic, additive, or antagonistic effects on the enzyme production behavior of the three strains and their combinations when grown together vs. when grown individually. The whole-genome sequence identified isolate AM1002 as (isolate 1), isolate AM0938 as (isolate 2), and isolate JD17 as (isolate 3). The three isolates used in the present study produce different enzymes (xylanase, cellulase, phytase, lipase, protease, and β-glucanase). However, this production was modified when two or more strains were combined, suggesting possible synergistic, antagonistic, or additive interactions. The Bliss analysis suggested ( < 0.05) that the combination of strains 1-2 and 1-2-3 had intermediate effects and predicted that the combination of strains 2-3 could have better effects than the combination of all the three strains. In summary, the current study demonstrated the need of selecting strains based on quantitative enzyme determination and data analysis to assess the impacts of combinations to avoid antagonistic interactions that could limit treatment efficacy. These results suggest that using strains 2-3 together could lead to a new generation of DFMs with effects superior to those already examined in strains 1-2-3 and, therefore, a potential alternative to growth-promoting antibiotics. More research utilizing poultry models is being considered to confirm and expand the existing findings.