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 | 2 | 21 | 99.51 | 0.40 | 2 | 9 | Backfill quarter. Reports assayed earlier were accepted retrospectively where custody could be documented. |
| 2024-Q2 | 4 | 12 | 99.30 | 0.47 | 4 | 3 | First quarter of live submission. |
| 2024-Q3 | 1 | 2 | 99.93, 99.90 | — | 1 | 0 | Nordanalyt Laboratories began contributing. |
| 2024-Q4 | 4 | 26 | 98.87 | 0.60 | 4 | 6 | Impurity-fingerprint matching introduced; first shared-bulk links published. |
| 2025-Q1 | 7 | 23 | 99.50 | 0.55 | 7 | 10 | Anomaly rule set expanded from seven rules to eleven. |
| 2025-Q2 | 5 | 21 | 99.73 | 0.23 | 5 | 16 | Gravimetric mass-balance reconciliation became mandatory on new records. |
| 2025-Q3 | 5 | 20 | 99.31 | 0.25 | 4 | 10 | Kestrel Bioanalytical began contributing; gradient-length normalisation introduced. |
| 2025-Q4 | 6 | 39 | 99.43 | 0.59 | 4 | 10 | Provenance classification became a required field. |
| 2026-Q1 | 13 | 51 | 99.67 | 0.47 | 11 | 20 | Rule AX-R12 added. Dataset v2 schema published. |
| 2026-Q2 | 7 | 35 | 99.59 | 0.59 | 7 | 5 | Buyer-sourced sensitivity analysis added to every supplier scorecard. |
| 2026-Q3 | 3 | 18 | 99.91 | 0.09 | 3 | 6 | 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.