Private company

Quadrangle Group

American private investment firm focused on private equity

Quadrangle Group LLC is a private investment firm focused on private equity. The firm invests in middle-market companies within the media, communications and information-based sectors.2 It was founded by Joshua Steiner and Steven Rattner.1 Wikipedia text CC BY-SA 4.0

Last updated Oct 20, 2026.

Overview

2000Founded1

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Quadrangle Group LLC is a private investment firm focused on private equity. The firm invests in middle-market companies within the media, communications and information-based sectors.2

The story

Founded by Joshua Steiner and Steven Rattner in 2000.1

Leadership

Who has led Quadrangle Group, and when. Pick a name to see everywhere that person has worked.

Chief executive

  1. Steven Rattner2000–2009
20052010201520202025

Timeline

  1. 2000New chief executive Steven Rattner becomes CEO1
  2. 2000Founded Founded1

Sources

The numbers on this page point here. Each one links to the record it came from.

  1. 1
  2. 2