SQ Capital is designed to target alpha in middle-market GP-led and LP secondaries—curating a high-quality portfolio with a conviction-led approach. Our strategy diverges from traditional secondaries firms, which were built for a world where casting a wide net and relying on beta was a viable strategy. That world no longer exists.
Traditional secondaries firms were built for a world that no longer exists, where casting a wide net and depending on beta was a viable investment strategy. SQ Capital is designed for today. We curate high-quality GP-led and LP secondaries in the middle market—buying with conviction to target best-in-class returns.
We’ve assembled the people, the technology, and the relationships to do exactly that.
Our team combines direct private equity training with deep secondaries technical expertise. We know how to underwrite and value portfolio companies because that’s what we’ve spent our careers doing.
We built our AI-native platform from scratch to meet the demands of rigorous secondaries asset selection and pricing—no retrofitting required. Data science-driven, this platform lets us move faster and make better-informed decisions.
Our GP relationships go beyond perfunctory update calls. Forged through years of close collaboration, ours are trust-based, peer-level connections with the senior decision-makers who know their portfolio companies best. This connectivity gives us privileged access to deal flow and information.
The result: an independent firm purpose-built to deliver alpha.
520 Madison Avenue
New York, NY 10022
Our team is built around our alpha-oriented, conviction-led secondaries investment strategy. It combines the rigor and judgment of direct private equity investors with deep secondaries technical expertise and cutting-edge data science and AI capabilities.
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 was 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.
Michael has over 27 years of experience in private equity finance and tax. He 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, Michael was the CFO of NewVest. He has also served as a Managing Director at PricewaterhouseCoopers, focusing on tax issues for private equity clients.
Michael holds a BS in Accounting from St. Francis College and an MS in Taxation from Pace University, and is a Certified Public Accountant (CPA).
Henry Minello is a Managing Director at SQ Capital, playing a leadership role in the evaluation and execution of investment opportunities.
Henry has over 24 years of experience in private equity investing. He was previously a Partner at Permira, a global private equity firm, where he spent 18 years and invested across a wide range of sectors. Prior to that, he was a Vice President at The Cypress Group and started his career as a Financial Analyst at Salomon Brothers.
Henry holds a BS summa cum laude in Finance from Georgetown University and an MBA from Harvard Business School.
Jonathan Hamilton is a Managing Director at SQ Capital, playing a leadership role in the evaluation and execution of investment opportunities.
Jonathan was previously at Blackstone, where he spent 11 years, most recently serving as a Managing Director in Blackstone GP Stakes and, prior to that, as a Principal in Blackstone Private Equity. Jonathan started his career as an Investment Banking Analyst at JP Morgan.
Jonathan holds a BBA in Business Administration from Baylor University.
Andrew Curry is a Managing Director at SQ Capital, leading the firm's investor relations and capital formation activities.
Andrew has over 21 years of experience in the private markets. Before joining SQ Capital, he was the Head of Global Credit Investor Relations and, prior to that, the Head of Global Private Equity Investor Relations at Carlyle, where he spent 13 years. Andrew was previously a Principal at Greenhill where he worked in the Private Capital Advisory Group and a Vice President at Lazard in the Private Fund Advisory Group.
Andrew holds a BA in Economics from Washington and Lee University.
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, where he spent ten years and 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. Prior to that, Naiel was 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.
Mark Epley is a Senior Advisor at SQ Capital, focusing on origination and GP coverage.
Mark has over 25 years of experience advising and financing a broad array of private equity firms. He was most recently Chairman of the Financial Sponsors Group at HSBC. Prior to that, he was a Managing Director and Global Head of Financial Sponsors at Nomura and at Deutsche Bank. Earlier in his career, he was an Executive Director at Morgan Stanley.
Mark holds a BA in Political Science from Princeton University and an MBA from Columbia Business School.
Mark Nevins is a Senior Advisor at SQ Capital, focusing on culture, talent, and organization development.
Mark is the President of Nevins Consulting, a firm that serves clients in senior-level leadership development, executive team alignment, and organizational development. For more than two decades, Mark has been a trusted advisor to CEOs, Managing Partners, and other enterprise leaders. He was previously Global Head of Organization Development & HR at Korn Ferry and Global Head of Organization Development & People Development at Booz Allen.
Mark holds a BA cum laude from The College of the Holy Cross and an MA and PhD from Harvard University.
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 BS in Mathematics from Rutgers University and a PhD in Mathematics from the University of California, Berkeley.
Steven Castaño is a Vice President at SQ Capital, focusing on the evaluation and execution of investment opportunities.
Steven was previously a Private Equity Associate at Vista Equity Partners. Prior to that, he was a Research Associate at Capital Group 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.
Ryan was previously a Vice President at Reverence Capital Partners, a middle-market private equity firm. Prior to that, he was an Investment Banking Analyst at Barclays.
Ryan holds a BS in Business Administration from NYU Stern School of Business.
Katherine Li is the Controller at SQ Capital, focusing on financial operations, accounting, and portfolio analytics.
Katherine was previously the Performance Controller at CVC Secondary Partners (formerly Glendower Capital), where she spent six years. Prior to that, she was an Associate at Stelliam Investment Management and a Fund Accountant at BNY Mellon.
Katherine holds a BS in Banking and Finance from Shanghai University of Finance and Economics and an MS in Accounting from the University of Illinois Urbana-Champaign, and is a CFA and CPA.
Michael Huang is an Associate at SQ Capital, focusing on the evaluation and execution of investment opportunities.
Michael was previously a Private Equity Associate at Audax Group, a middle-market private equity firm.
Michael holds a BS in Business Administration from the University of California, Berkeley.
Franko Jira is an Associate at SQ Capital, focusing on the evaluation and execution of investment opportunities.
Franko was previously an Investment Banking Analyst at Morgan Stanley and 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.
Kaitlyn was previously a Private Equity Associate at The Carlyle Group. Prior to that, she was 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.
Christina was previously a Private Equity Associate at Paine Schwartz Partners. Prior to that, she was an Investment Banking Analyst at Goldman Sachs.
Christina holds a BA cum laude in Economics from Princeton University.
Max Ryder is the Chief of Staff at SQ Capital, focusing on daily operations and special projects.
Max was previously a Vice President at Bridge Investment Group (through its acquisition of Newbury Partners). Prior to that, he was Deputy COO at Indochina Capital.
Max holds a BA magna cum laude in Political Science from the University of Pennsylvania and an MBA from Harvard Business School.
Sophia DiStefano is the Executive Assistant at SQ Capital.
Sophia was previously a Director’s Assistant at The Wall Group and holds a BS in Kinesiology from the University of Michigan.
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