# Mustafa Siddiqui

> Mustafa M. Siddiqui is the New York-based founder and CEO of SQ Capital, a middle-market private equity secondaries firm launched in January 2025. Previously he led Blackstone’s global GP stakes business and worked in its private equity group. His career also includes General Atlantic, Springbok Capital and McKinsey & Company. He is a Council on Foreign Relations member.

- **Role:** Founder & CEO at SQ Capital
- **Organizations:** SQ Capital, Blackstone, General Atlantic, Springbok Capital, McKinsey & Company, Council on Foreign Relations
- **Education:** AB in Economics, magna cum laude, Harvard College, AM in Regional Studies, Harvard University, MBA with High Distinction, Baker Scholar, Harvard Business School
- **Known for:** Graduated from Harvard Business School with High Distinction as a Baker Scholar., Led Blackstone’s global GP stakes business., Founded SQ Capital in January 2025.

## Career timeline

- **Before 2002** — Worked as a consultant at McKinsey & Company.
- **2002** — Began his private equity career at General Atlantic.
- **Before 2009** — Worked in public markets at Springbok Capital.
- **2009–2020** — Worked in Blackstone Private Equity, ultimately as a senior managing director.
- **2018** — Named to join Mime Petroleum’s board as part of Blackstone Energy Partners’ partnership with Blue Water Energy.
- **2020–2024** — Served as global head of Blackstone GP Stakes; became sole head following a 2021 leadership change.
- **2024** — Announced departure after fourteen and a half years at Blackstone.
- **2025-01** — Launched SQ Capital in New York.
- **2026-08** — SQ Capital named a co-lead investor in Exponent’s approximately €750 million H&MV Engineering continuation vehicle.

## Achievements

- Graduated from Harvard Business School with High Distinction as a Baker Scholar.
- Led Blackstone’s global GP stakes business.
- Founded SQ Capital in January 2025.
- SQ Capital was named SecondaryLink’s Top New Secondary Buyer of 2025 in March 2026.

## Latest updates

- **2026-09** — Macfarlanes published its account of advising on the H&MV continuation vehicle, identifying SQ Capital among its institutional investors.
- **2026-08** — Exponent announced the H&MV Engineering continuation vehicle with SQ Capital as a co-lead investor.
- **2026-05** — Mergermarket reported SQ Capital had invested in five transactions: two continuation vehicles and three LP-led secondary deals.
- **2026-03** — Appeared in a PE Forum interview hosted by Khaled Abou Zahr about private equity liquidity and secondaries.

## Links

- Website: https://sqcapital.com/
- LinkedIn: https://www.linkedin.com/in/mustafasiddiqui1

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Profile page: https://yespress.io/mustafa-siddiqui
Published by YesPress — https://yespress.io
Last updated: 2026-10-09