About This Deal

CHARLES RIVER LABORATORIES INTERNATIONAL, INC. acquired Inveresk Research Group, Inc. for approximately $1.5 billion, a transaction completed in October 2004, structured as cash and stock. The deal was a Merger.

Inveresk Research Group, Inc. operates in Discovery and Safety Assessment (DSA), is based in United Kingdom (Edinburgh, Scotland). Inveresk Research Group was a NASDAQ-listed (IRGI) global contract research organization providing preclinical and clinical drug development services. The combination created a broader early-stage CRO spanning research models through clinical-stage development.

Charles River announced that it has completed its merger with Inveresk Research Group, Inc. The transaction was approved by shareholders of each company at special meetings held today.

Folded into Charles River's drug development / safety assessment operations

Deal Terms

Acquirer
CHARLES RIVER LABORATORIES INTERNATIONAL, INC.
Target
Inveresk Research Group, Inc.
Value
approximately $1.5 billion
Date
October 2004
Type
Merger
Status
Ready

Transaction Details

Target HQ
United Kingdom (Edinburgh, Scotland)
Segment
Discovery and Safety Assessment (DSA)
Structure
cash and stock
Announced
July 1, 2004
Closed
October 20, 2004

Advisors

Advisory firms were not disclosed for this transaction.

Related Deals & Entities

Sources: Press release ↗ · SEC filing ↗ · Last updated June 11, 2026

See how VectorShift works for your firm

Request Demo