M&A Deal Summary

AbbVie Acquires Gilgamesh - Bretisilocin

On August 25, 2025, AbbVie acquired life science company Gilgamesh - Bretisilocin from Gilgamesh for 1.2B USD

Acquisition Highlights
  • This is AbbVie’s 15th transaction in the Life Science sector.
  • This is AbbVie’s 8th largest (disclosed) transaction.
  • This is AbbVie’s 13th transaction in the United States.
  • This is AbbVie’s 1st transaction in New York.

M&A Deal Summary

Date 2025-08-25
Target Gilgamesh - Bretisilocin
Sector Life Science
Buyer(s) AbbVie
Sellers(s) Gilgamesh
Deal Type Divestiture
Deal Value 1.2B USD

Target

Gilgamesh - Bretisilocin

New York, New York, United States
Gilgamesh's Bretisilocin is a 5-HT2A receptor agonist and 5-HT releaser, a novel, next-generation psychedelic compound designed to address development challenges observed within this class of compounds.

Search 214,238 Deals Now

SEARCH BY

  • Buyer Type (PE or Strategic)
  • Deal Size ($10M to $10B+)
  • Sector (60 Sectors)
  • Deal Type
  • Geography
  • & More

Try Free

Buyer(S) 1

Buyer

AbbVie

North Chicago, Illinois, United States

Category Company
Founded 2012
Sector Life Science
Employees55,000
Revenue 56.3B USD (2024)
DESCRIPTION
Entrance to Abbvie's office in Lake Forest, Illinois.
Entrance to Abbvie's office in Lake Forest, Illinois.

AbbVie is a research-based biopharmaceutical company. AbbVie develops and markets advanced therapies that address complex and serious diseases. AbbVie's products are focused on treating conditions such as chronic autoimmune diseases, including rheumatoid arthritis, psoriasis, and Crohn's disease; low testosterone; HIV; endometriosis; thyroid disease; Parkinson's disease; and complications associated with chronic kidney disease and cystic fibrosis, among other health conditions. AbbVie was founded in 2012 and is based in North Chicago, Illinois.


DEAL STATS #
Overall 15 of 15
Sector: Life Science M&A 15 of 15
Type: Divestiture M&A Deals 2 of 2
State: New York M&A 1 of 1
Country: United States M&A 13 of 13
Year: 2025 M&A 2 of 2
Size (of disclosed) 8 of 12
PREVIOUS DEAL
DATE TARGET DEAL TYPE VALUE
2025-06-30 Capstan

San Diego, California, United States

Capstan Therapeutics is developing a targeted delivery platform and therapeutics to reprogram immune cells in vivo for a broad range of disease categories. Capstan was founded in 2021 and is based in San Diego, California.

Buy $2.1B

Seller(S) 1

SELLER

Gilgamesh

New York, New York, United States

Category Company
Founded 2019
Sector Life Science
DESCRIPTION

Gilgamesh is a clinical-stage neuroscience biotech developing innovative, best-in-class new chemical entities that transform the treatment paradigm of psychiatric diseases, moving away from symptom management towards rapid-acting and durable therapies. Gilgamesh designs therapies acting through precedented mechanisms, which are optimized for safety, efficacy, and patient access. Gilgamesh was founded in 2019 and is based in New York, New York.


DEAL STATS #
Overall 1 of 1
Sector: Life Science M&A 1 of 1
Type: Divestiture M&A Deals 1 of 1
State: New York 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