Blackstone Acquires International Gemological Institute (IGI)

International Gemological Institute Acquires American Gemological Laboratories

February 7, 2026

Professional Services

The International Gemological Institute (IGI) has acquired American Gemological Laboratories (AGL), a specialist in colored gemstone analysis and provenance reporting. AGL will remain headquartered in New York and continue operating under its brand with Chris Smith staying as President and Chief Gemologist; IGI said the acquisition—supported by Blackstone—will broaden its colored-gemstone capabilities and help expand AGL’s services beyond the U.S.

American Securities Acquires Integrated Global Services, Inc. from J.F. Lehman & Company

March 6, 2025

Industrial Services

American Securities has acquired Integrated Global Services, Inc. (IGS) from investment affiliates of J.F. Lehman & Company. IGS, a Richmond, Virginia–headquartered provider of industrial surface-protection, asset integrity and environmental efficiency technologies serving power, energy and industrial markets, will partner with American Securities to accelerate growth and expand adoption of its proprietary solutions.

EssilorLuxottica Acquires Optical Investment Group (Romania)

July 30, 2024

Retail

EssilorLuxottica has agreed to acquire the entire share capital of Optical Investment Group (OIG), Romania’s leading optical retailer, from Innova/6 (an Innova Capital fund) and a group of individual minority shareholders. OIG operates 99 stores under the OPTIblu, Optiplaza and O51 banners, with over 650 employees; the transaction is expected to close in Q4 2024 subject to regulatory approvals.

Blackstone Acquires International Data Group (IDG) for $1.3B

November 17, 2021

Data & Analytics

Blackstone’s private equity funds have completed the acquisition of International Data Group, Inc. (IDG) from Oriental Rainbow, LLC (a China Oceanwide subsidiary) for an enterprise value of $1.3 billion. IDG — which includes IDC and IDG Communications — provides market intelligence, data and technology-focused media; Blackstone said it will partner with IDG to expand product offerings and drive technology innovation.

Blackstone to Acquire Interior Logic Group for $1.6 Billion

February 1, 2021

Construction

Private equity funds managed by Blackstone have reached a definitive agreement to acquire Interior Logic Group (ILG) from Littlejohn & Co., Platinum Equity and other equity holders for approximately $1.6 billion. ILG is a technology-enabled provider of interior design, supply chain and installation management solutions to large single-family homebuilders across 37 states; Blackstone said it will support ILG's geographic expansion, accelerate technology innovation and pursue growth opportunities.

J.F. Lehman & Company Acquires Integrated Global Services

February 4, 2020

Industrial Services

J.F. Lehman & Company (through an investment affiliate) acquired Integrated Global Services (IGS), a Richmond, Virginia–based provider of engineered surface protection and metal cladding solutions, in a transaction that closed February 4, 2020. The deal — the first platform investment for JFLCO's JFL Equity Investors V fund — was financed in part with debt from Benefit Street Partners and involved selling shareholders including Industrial Growth Partners.