# Quadrangle Group

Quadrangle Group is a Multi Family Office based in New York, United States.

## Overview

- **Organization type:** Multi Family Office
- **Headquarters:** New York, United States
- **Region:** North America
- **Address:** New York, NY, United States
- **Founded:** 2000
- **Assets under management:** Undisclosed
- **Website:** quadranglegroup.com
- **LinkedIn:** https://www.linkedin.com/company/quadrangle-group

## Regulatory record

- **Reports private funds:** No

## About

Quadrangle Group was established in 2000 by Steven Rattner and three Lazard colleagues. Capital originated from the partners' investment-banking earnings and early media private equity activity. The firm pursues buyout and growth investments in private equity, distressed situations, hedge funds and private credit. Confirmed focuses include media and entertainment plus enterprise software. Geographic reach spans North America, Europe, Asia, Africa, South America and the Caribbean. Named relationships include former operating principal Daniel Rosensweig, now CEO of Chegg. Team size and total deployment remain undisclosed. The firm maintains the Quadrangle Group Foundation Inc. and holds memberships in the Young Presidents Organization, Paley Center International Council and Council on Foreign Relations. No operational events from the last 24 months appear in available records. The structure traces to a former Lazard media team that converted banking relationships into a dedicated multi-family platform focused on sector-specific holdings rather than broad mandates.

## Sectors

- Media & Entertainment
- Private Equity
- FinTech
- Data Analytics

## People

- Steven Rattner — Founder
- Peter Ezersky — Managing Principal
- Joshua Steiner — Co-founder
- David Tanner — Co-founder

## Questions

### Who runs investment decisions at Quadrangle Group?

Peter Ezersky serves as current Managing Principal. Steven Rattner, Joshua Steiner and David Tanner founded the firm; Rattner now chairs Willett Advisors while Steiner works at Bloomberg LP and Tanner at Three Mile Capital.

### Does Quadrangle Group participate in fund commitments or only direct deals?

The firm deploys through private equity, distressed and turnaround strategies, hedge funds and private credit. Specific fund or direct allocation splits are not disclosed.

### What investment stages does Quadrangle Group typically target?

Buyout and growth stages form the core focus according to the firm's documented strategy.

### How is Quadrangle Group related to Michael Bloomberg?

The firm previously managed personal and foundation assets for Michael Bloomberg until 2010.

## Related profiles

- [Quabbin Capital](https://altss.com/profile/quabbin-capital)
- [Quadrant Capital](https://altss.com/profile/quadrant-capital-michael-young-family-office)

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Last updated: 2026-08-10T15:54:10.904Z

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