This notice announces a two‑year extension (Sept 2026‑Sept 2028) of the ordering period for four existing NIH Blueprint Neurotherapeutics Network IDIQ contracts that provide pre‑clinical pharmacology and toxicology services. The extension allows the incumbent contractors to continue supporting IND‑enabling studies, safety pharmacology, ADMET assays, and other toxicology work while the PTTP requirement is re‑competed. Interested parties may submit expressions of interest, capability statements, or objections by the response deadline.