M&A Deal Summary

GSK Acquires Efimosfermin

On May 14, 2025, GSK acquired life science company Efimosfermin from Boston Pharmaceuticals for 1.2B USD

Acquisition Highlights
  • This is GSK’s 28th transaction in the Life Science sector.
  • This is GSK’s 12th largest (disclosed) transaction.
  • This is GSK’s 21st transaction in the United States.
  • This is GSK’s 5th transaction in Massachusetts.

M&A Deal Summary

Date 2025-05-14
Target Efimosfermin
Sector Life Science
Buyer(s) GSK
Sellers(s) Boston Pharmaceuticals
Deal Type Divestiture
Deal Value 1.2B USD

Target

Efimosfermin

Cambridge, Massachusetts, United States
Efimosfermin is a novel, once-monthly fibroblast growth factor 21 analog therapeutic in clinical development for the treatment of metabolic dysfunction-associated steatohepatitis, including cirrhosis, and future development in alcohol-related liver disease. Efimosfermin is based in Cambridge, Massachusetts.

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Buyer(S) 1

Buyer

GSK

Brentford, United Kingdom

Category Company
Founded 1715
Sector Life Science
Employees68,629
Revenue 31.4B GBP (2024)
DESCRIPTION
Entrance to a GlaxoSmithKline facility in Morristown, New Jersey.
Entrance to a GlaxoSmithKline facility in Morristown, New Jersey.

GSK is a multinational pharmaceutical, biologics, vaccines and consumer healthcare company. GSK was founded in 1715 and is based in Brentford, United Kingdom.


DEAL STATS #
Overall 34 of 35
Sector: Life Science M&A 28 of 28
Type: Divestiture M&A Deals 6 of 7
State: Massachusetts M&A 5 of 5
Country: United States M&A 21 of 21
Year: 2025 M&A 2 of 3
Size (of disclosed) 12 of 31
PREVIOUS DEAL
DATE TARGET DEAL TYPE VALUE
2025-01-13 IDRx

Cambridge, Massachusetts, United States

IDRx is a clinical-stage biopharmaceutical company dedicated to transforming cancer care with intelligently designed precision therapies. IDRx was founded in 2022 and is based in Cambridge, Massachusetts.

Buy $1.2B
FOLLOWING DEAL
DATE TARGET DEAL TYPE VALUE
2025-06-02 Trelegy Ellipta

London, United Kingdom

Trelegy Ellipta is a prescription inhaled medication formulated for the long-term maintenance treatment of chronic obstructive pulmonary disease, including emphysema and chronic bronchitis, and, in some instances, for asthma in adults. Trelegy Ellipta is based in London, United Kingdom.

Buy $225M

Seller(S) 1

SELLER

Boston Pharmaceuticals

Cambridge, Massachusetts, United States

Category Company
Founded 2016
Sector Life Science
DESCRIPTION

Boston Pharmaceuticals is a clinical-stage biopharmaceutical company focused on developing highly engineered therapies to transform the lives of patients who fight serious liver diseases. Boston Pharmaceuticals was founded in 2016 and is based in Cambridge, Massachusetts.


DEAL STATS #
Overall 1 of 1
Sector: Life Science M&A 1 of 1
Type: Divestiture M&A Deals 1 of 1
State: Massachusetts M&A 1 of 1
Country: United States M&A 1 of 1
Year: 2025 M&A 1 of 1
Size (of disclosed) 1 of 1