TB-500 by quarter
Coverage and results for TB-500 quarter by quarter. Read the supplier-count column beside the median: a quarter where the compound mix changed is not comparable with the one before it, and the index cannot hold that constant retrospectively.
| Quarter | Batches | Reports | Median purity % | IQR pp | Suppliers | Flagged | What changed in the index |
|---|---|---|---|---|---|---|---|
| 2024-Q1 | 3 | 7 | 99.46 | 0.45 | 2 | 7 | Backfill quarter. Reports assayed earlier were accepted retrospectively where custody could be documented. |
| 2024-Q2 | 3 | 20 | 99.61 | 0.36 | 3 | 20 | First quarter of live submission. |
| 2024-Q3 | 2 | 11 | 99.29 | 0.69 | 2 | 11 | Nordanalyt Laboratories began contributing. |
| 2024-Q4 | 6 | 20 | 98.86 | 0.47 | 5 | 20 | Impurity-fingerprint matching introduced; first shared-bulk links published. |
| 2025-Q1 | 8 | 58 | 99.69 | 0.56 | 7 | 51 | Anomaly rule set expanded from seven rules to eleven. |
| 2025-Q2 | 6 | 35 | 99.80 | 0.55 | 5 | 28 | Gravimetric mass-balance reconciliation became mandatory on new records. |
| 2025-Q3 | 10 | 40 | 99.09 | 1.01 | 7 | 40 | Kestrel Bioanalytical began contributing; gradient-length normalisation introduced. |
| 2025-Q4 | 8 | 56 | 99.03 | 0.91 | 6 | 52 | Provenance classification became a required field. |
| 2026-Q1 | 10 | 49 | 99.68 | 0.53 | 7 | 38 | Rule AX-R12 added. Dataset v2 schema published. |
| 2026-Q2 | 8 | 42 | 99.47 | 0.70 | 6 | 40 | Buyer-sourced sensitivity analysis added to every supplier scorecard. |
| 2026-Q3 | 3 | 18 | 99.72 | 0.38 | 2 | 17 | Quarter in progress. Aggregates for this quarter are provisional. |
Median purity by quarter
Quarters with fewer than two purity records are gaps in the line rather than zeroes. A trend across 11 points, most of them thin, is a shape and not a finding.