A modern secondaries firm.
SQ Capital is a modern secondaries firm designed to deliver alpha. We target best-in-class returns across LP-led and GP-led opportunities, focusing on the middle market.
Our team draws on an elite direct investing pedigree, deep GP relationships, an insider's understanding of private equity GPs and their portfolios, and cutting-edge data and AI capabilities.
We combine these strengths with an entrepreneurial mindset to move quickly and with conviction to raise the bar in the secondary market.
520 Madison Avenue, 21st Floor
New York, NY 10022
Mustafa M. Siddiqui is the Founder and Chief Executive Officer of SQ Capital, responsible for oversight of the firm with a particular focus on supervising the evaluation and execution of investments.
Mustafa previously served as the Global Head of Blackstone GP Stakes from 2020 to 2024. Before this role, Mustafa served as a Senior Managing Director of Blackstone Private Equity, where he worked from 2009 to 2020. He began his private equity career at General Atlantic in 2002, followed by a brief stint in public markets. Earlier in his career, he was a consultant at McKinsey & Company.
Mustafa holds a BA magna cum laude from Harvard College, an MA from Harvard University, and an MBA with High Distinction (Baker Scholar) from Harvard Business School. He is a Member of the Council on Foreign Relations.
Michael Petryczenko is the Chief Financial Officer and Chief Compliance Officer of SQ Capital, overseeing financial operations, accounting, and tax strategy. He has over 27 years of experience in private equity finance and tax.
Michael has previously served as the CFO of Blackstone Strategic Partners, Blackstone’s secondary investment business. During his 16 years at Strategic Partners, he managed financial reporting, accounting, and tax structuring across various asset classes, including private equity, real estate, venture capital, and infrastructure. Most recently, he was the CFO of NewVest. He has also served as a Managing Director at PwC.
Michael holds a BS in Accounting from St. Francis College, an MS in Taxation from Pace University, and is a Certified Public Accountant (CPA).
Naiel Iqbal is an Operating Partner at SQ Capital, overseeing the development and execution of SQ Capital’s data science and AI capability.
Naiel was previously Head of Data and Research at Tiger Global Management, a global investment firm focused on venture capital and public markets, where he spent 10 years. He led a team of nine data scientists and researchers who built a world-class, data-driven insights platform. He was also responsible for developing new Generative AI-driven research and portfolio management tools. He was previously a Global Macro & Systematic Trading Analyst at Caxton Associates and an Associate in JP Morgan’s Global Proprietary Equities Group.
Naiel holds a BS in Economics from the Wharton School of the University of Pennsylvania, where he was the recipient of the Albert A. Berg Award.
Eric Wayman is a Director at SQ Capital, focusing on the development and execution of SQ Capital’s data science and AI capability.
Eric was previously Senior Staff Data Scientist at Lightspeed Venture Partners, where he worked from 2019 to 2025. Prior to that, he was a Senior Data Scientist at Salesforce and a Data Scientist II at Pivotal Software.
Eric holds a PhD from the University of California, Berkeley and a BS from Rutgers University.
Steven Castaño is a Vice President at SQ Capital, focusing on the evaluation and execution of investment opportunities.
Before joining SQ Capital, Steven was a Private Equity Associate at Vista Equity Partners, a technology-focused private equity firm. He was previously a Research Associate at Capital Group, one of the world’s largest investment management firms, and an Equity Research Analyst at Credit Suisse.
Steven holds a BA in History from Yale University and an MBA from Harvard Business School.
Ryan Cockburn is a Vice President at SQ Capital, focusing on the evaluation and execution of investment opportunities.
Before joining SQ Capital, Ryan was a Vice President at Reverence Capital Partners, a middle-market private equity firm. He was previously an Investment Banking Analyst at Barclays.
Ryan holds a BS in Business Administration from NYU Stern School of Business.
Franko Jira is an Associate at SQ Capital, focusing on the evaluation and execution of investment opportunities.
Before joining SQ Capital, Franko was an Investment Banking Analyst at Morgan Stanley. Prior to that, Franko was a Private Equity Research Associate for Professor Josh Lerner at Harvard Business School.
Franko holds a BA in Economics from Harvard University.
Kaitlyn Kang is an Associate at SQ Capital, focusing on the evaluation and execution of investment opportunities.
Before joining SQ Capital, Kaitlyn was a Private Equity Associate at The Carlyle Group. She was previously an Investment Banking Analyst at Morgan Stanley.
Kaitlyn holds a BA in Economics and Architecture from the University of California, Berkeley.
Christina Xu is an Associate at SQ Capital, focusing on the evaluation and execution of investment opportunities.
Before joining SQ Capital, Christina was a Private Equity Associate at Paine Schwartz Partners. She was previously an Investment Banking Analyst at Goldman Sachs.
Christina holds a BA cum laude in Economics from Princeton University.