The supplementary figures and notes provide detailed information on the evaluation metrics, bundle detection rates, and the methods used by different teams for processing and analyzing diffusion-weighted imaging (DWI) data. Supplementary Figure 1 explains the overlap (OL) and overreach (OR) metrics, which quantify the overlap and non-overlapping volume of evaluated bundles with ground truth bundles. Supplementary Figure 2 introduces alternative metrics such as precision, recall, Dice coefficient, and Jaccard index for bundle detection. Supplementary Figure 3 visualizes valid and invalid bundles, showing their distribution and fiber counts. Supplementary Figure 4 compares anatomically constrained and global tractography results. Supplementary Figure 5 analyzes the distribution of streamlines across valid and invalid bundles. Supplementary Figure 6 discusses bundle selection based on fiber count. Supplementary Figure 7 and 8 provide detailed descriptions of bundle refinement and the definition of valid connections using tractometer metrics. Supplementary Note 1 provides abstracts of different teams' submissions, detailing their preprocessing, distortion correction, and tractography methods. The notes also include extended tractography experiments, including ground truth field of fiber orientations and anatomically constrained and global tractography comparisons.The supplementary figures and notes provide detailed information on the evaluation metrics, bundle detection rates, and the methods used by different teams for processing and analyzing diffusion-weighted imaging (DWI) data. Supplementary Figure 1 explains the overlap (OL) and overreach (OR) metrics, which quantify the overlap and non-overlapping volume of evaluated bundles with ground truth bundles. Supplementary Figure 2 introduces alternative metrics such as precision, recall, Dice coefficient, and Jaccard index for bundle detection. Supplementary Figure 3 visualizes valid and invalid bundles, showing their distribution and fiber counts. Supplementary Figure 4 compares anatomically constrained and global tractography results. Supplementary Figure 5 analyzes the distribution of streamlines across valid and invalid bundles. Supplementary Figure 6 discusses bundle selection based on fiber count. Supplementary Figure 7 and 8 provide detailed descriptions of bundle refinement and the definition of valid connections using tractometer metrics. Supplementary Note 1 provides abstracts of different teams' submissions, detailing their preprocessing, distortion correction, and tractography methods. The notes also include extended tractography experiments, including ground truth field of fiber orientations and anatomically constrained and global tractography comparisons.