Pharma BD Deal Intelligence

Biossil, Inc. / Summit Therapeutics plc

2026 · Asset Purchase · $104M · Complete

The coverage arc

Jul 15, 2026 biospace.com Neutral

Summit Therapeutics signs agreement to sell Phase III asset ridinilazole to Biossil for $500K upfront plus up to $104.5M in milestones and tiered royalties.

Jul 15, 2026 stocktitan.net Neutral

Summit Therapeutics signs ridinilazole deal worth up to $104.5M; asset sale lets Summit focus on oncology.

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Summit Therapeutics agreed to sell its Phase 3 precision antibiotic ridinilazole to Toronto-based, AI-native biopharma Biossil, Inc., announced July 15, 2026. Biossil pays $500,000 upfront plus up to $104.5 million in regulatory and commercial milestones and tiered royalties on future net sales. Ridinilazole, a narrow-spectrum antibiotic previously evaluated in Summit's Phase 3 Ri-CoDIFy program for Clostridioides difficile infection, is a non-core asset for Summit, which is prioritizing its oncology strategy; Biossil intends to advance the late-stage program in a high-unmet-need indication.

This deal is too recent to grade. Critic Score and Outcome Score are assigned after the announcement-week coverage settles and, for Outcome, after the 5-year post-close assessment window opens — expected 2031 at the earliest for this deal, once/if it closes.

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