India, July 16 -- Aptorum Group Ltd. (APM), a clinical-stage biopharmaceutical company, on Wednesday announced a definitive all-stock merger agreement with DiamiR Biosciences. The deal is expected to close in the fourth quarter of 2025.

Shares of Aptorum are increasing by around 171% in the premarket trading.

Under the agreement, Aptorum Group will re-domicile to Delaware before completing the merger with DiamiR.

After the merger, DiamiR shareholders will own about 70% of the combined company, while existing Aptorum shareholders will retain 30%.

DiamiR will retain its name and become a wholly owned subsidiary of Aptorum upon completion.

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The combined c...