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Alnylam Announces Partial Repurchase of 1.00% Convertible Senior Notes Due 2027

Alnylam Pharmaceuticals (ALNY) | December 11, 2025

By Fiona Wilson

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Alnylam Pharmaceuticals announced a partial repurchase of its 1.00% Convertible Senior Notes due 2027.

The company entered into privately negotiated repurchase agreements with certain holders of the Notes.

Approximately $34.4 million principal amount of the Notes will be repurchased for a total cost of $51.9 million.

Repurchase Details

Approximately $34.4 million principal amount of the Notes repurchased for $51.9 million.

Remaining Notes

After the repurchase, approximately $362.8 million principal amount of the Notes will remain outstanding.

Capped Call Transactions

Previous capped call transactions with financial institutions expected to remain in effect.

  • The repurchase will reduce the outstanding principal amount of the Notes.
  • The company aims to optimize its financial position by repurchasing Notes at favorable terms.

Alnylam Pharmaceuticals strategically repurchased a portion of its Notes, demonstrating proactive financial management. This move is expected to positively impact the company's financial stability and optimize its capital structure in the long term.