Merck to Acquire Silence Therapeutics for $1.3 Billion
Merck (MRK) will acquire Silence Therapeutics (SLN) for $20 per ADS, valuing it at $1.3B. The deal, expected to close in Q1 2027, aims to bolster Merck's rare disease pipeline with Silence's Divesiran treatment. Silence's shareholders representing 14% of voting power support the acquisition.
How this was made

The 30-second read
Why it matters
The transaction provides Merck with a late‑stage candidate (Divesiran) and offers Silence shareholders a substantial premium, likely triggering a sharp price move in SLN and modest market reaction for MRK.
Market read
A $1.3 billion cash deal with an 82% premium is a material event for both stocks and the broader pharma M&A landscape.
What to watch
Regulatory approval risk for the Divesiran therapy and integration challenges may temper upside.
Background
Merck KGaA (MRK) is expanding its specialty and rare‑disease portfolio through the acquisition of UK‑based Silence Therapeutics (SLN).
Ticker impact
Merck announced a $1.3 billion cash acquisition of Silence Therapeutics, expanding its rare‑disease pipeline.
likely modest pressure as the market prices in the acquisition cost and debt increase.
The deal size is material for a large cap; impact depends on integration risk and financing terms.
Silence Therapeutics is being bought at $20 per ADS, an 82% premium to its recent price.
likely strong upside as the market prices in the acquisition premium.
An 82% premium is a clear catalyst for a near‑term price jump.
Market effects
Strengthens Merck's position in the rare‑disease biotech sector, potentially prompting peer M&A activity.
European biotech market may see increased valuation multiples after the premium deal.
Adds to the wave of large pharma consolidations, influencing global pharma M&A sentiment.
Counterpoint
The deal could overpay for Silence's pipeline, leading to long‑term dilution for Merck shareholders.
Key entities
- CompanyMerck KGaA
Global pharmaceutical company acquiring Silence Therapeutics.
- CompanySilence Therapeutics
Biotech firm developing Divesiran for polycythemia vera.


