SQ Capital
SQ Capital is a New York-based secondaries investment firm founded in 2025 by former Blackstone GP Stakes head Mustafa M. Siddiqui, targeting alpha in middle-market GP-led and LP secondaries through a conviction-led approach backed by a proprietary AI-native underwriting platform.
- Company typePrivate
- Founded2025
- HeadquartersNew York, United States
- Headcount11–50
- GTM typeB2B
- OfferingServices
What SQ Capital does
SQ Capital is a New York-based secondaries investment firm founded in 2025 by Mustafa M. Siddiqui, the former Global Head of Blackstone GP Stakes. The firm targets alpha in middle-market GP-led and LP secondary transactions in private equity, pursuing a conviction-led approach that combines traditional underwriting judgment with proprietary AI tooling. Its customer base is two-sided: general partners seeking liquidity solutions via continuation vehicles or tender offers, and limited partners seeking liquidity from existing private equity commitments.
The firm's core technological asset is an AI-native underwriting platform built from scratch specifically for secondaries asset selection and pricing. The platform is designed to ingest data on private companies, valuations, GP performance, and LP portfolios to identify pricing dislocations and underwriting opportunities. The firm has assembled a team of approximately 17 professionals with deep expertise across private equity, secondaries, and data science, including dedicated senior leadership for AI/data capabilities drawn from Tiger Global, Lightspeed, and Salesforce. Execution to date includes a debut K1 single-asset continuation vehicle and a TeamDynamix secondary transaction completed in October 2025, with the firm recognized as a Top New Secondary Buyer of 2025 by SecondaryLink.
SQ Capital generates revenue through the standard private equity fund model: management fees (typically 1-1.5% of committed capital during the investment period) and carried interest (typically 15-20% above a hurdle) on fund returns. The firm is currently in the market with a $1 billion debut fund target announced in May 2025.
SQ Capital firmographics
Firmographics- Name
- SQ Capital
- Legal name
- SQ Capital
- Website
- https://sqcapital.com
- Company type
- Private
- Founded year
- 2025
- Operating status
- Operating
- Headcount range
- 11–50 employees
- Short description
- SQ Capital is a New York-based secondaries investment firm founded in 2025 by former Blackstone GP Stakes head Mustafa M. Siddiqui, targeting alpha in middle-market GP-led and LP secondaries through a conviction-led approach backed by a proprietary AI-native underwriting platform.
- Ownership category
- akta.pro rank
SQ Capital industry classification
Industry- Product category
- Private Equity Secondaries Investment
- NAICS
- Portfolio Management and Investment Advice (523940)
- SIC
- Investment Advice (6282)
- akta.pro primary industry
- Emerging Manager / Small Fund Secondaries (FSANAFAL)
- akta.pro secondary industry
- LP Secondaries — Growth Equity Funds (FSAHALAC)
Keywords
Where SQ Capital is headquartered
LocationHeadquarters
- HQ city
- New York
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
SQ Capital business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Technology or R&D, Operations, Marketing or Sales
Revenue model
- Fund Management / Investment Management: Generates revenue through management fees and carried interest from their debut secondaries fund targeting $1bn AUM. Revenue derived from managing GP-led and LP secondary investments in middle-market private equity.
Go-to-market motion1 record
Distribution channels1 record
Marketing channels1 record
SQ Capital product offering
Product offeringCore offering
SQ Capital is a secondaries investment firm that curates middle-market GP-led and LP-led secondary investments in private equity through a conviction-led approach. The firm manages a debut secondaries fund targeting $1 billion in AUM, deploying capital into continuation vehicles, single-asset CVs, and LP portfolio secondary transactions. Investment selection and pricing are supported by an internally-built, AI-native data science platform developed specifically for secondaries underwriting.
Product overview
SQ Capital is a financial services firm specializing in private equity secondaries investments, specifically targeting alpha in middle-market GP-led and LP secondaries. The firm operates an internally-built AI-native platform for asset selection and pricing, which is used to support their investment strategy rather than offered as a standalone product or service to external customers.
Differentiator
Problem solved
Functional benefit
Products and services
- Debut Secondaries Fund SQ Capital's flagship debut secondaries fund targeting $1 billion in assets under management (AUM). The fund invests in middle-market GP-led secondaries (including continuation vehicles and single-asset CVs) and LP-led secondary transactions, deploying capital with a conviction-led, alpha-oriented approach for institutional limited partners.
Companies that use SQ Capital
Customer profileNamed customers1 record
Segments2 records
Ideal customer profiles3 records
SQ Capital technology and API
TechnologyTechnology focussed Yes
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Feature1 record
SQ Capital partnerships and signals
Strategic signalScale indicators3 records
Recent moves5 records
Expansion highlights4 records
SQ Capital competitors and assessment
Company assessmentBroad incumbents
- StepStone Group: Large multi-strategy private markets investment manager with a dedicated secondaries and GP-led solutions vertical. Broader platform than SQ Capital but competes directly on continuation vehicle and LP-led secondary mandates.
Direct peers
- Lexington Partners: Largest dedicated secondary private equity and alternative investment manager globally, with deep coverage of both GP-led continuation vehicles and LP-led portfolio sales. Direct competitor for SQ Capital's middle-market and large-cap secondaries deal flow.
- Aether Investment Partners: Emerging manager focused on secondaries in the middle market with a conviction-led, relationship-driven approach. Highly comparable niche focus and emerging manager profile to SQ Capital, both targeting continuation vehicles underserved by mega secondaries platforms.
- Coller Capital: Pure-play secondaries specialist with deep LP-led and GP-led continuation vehicle activity globally. One of the longest-tenured dedicated secondaries franchises and a direct competitor for SQ Capital on both deal types.
- CVC Secondary Partners: Dedicated private equity secondaries manager within CVC (formerly Glendower Capital), focused on LP-led and GP-led transactions including continuation vehicles. Highly comparable middle-market and large-cap mandate overlap with SQ Capital.
- HarbourVest Partners: Global private markets investment manager with one of the largest secondaries practices, actively purchasing both LP-led fund interests and GP-led continuation vehicles across middle-market and large-cap. SQ Capital competes for many of the same continuation vehicle mandates.
- Ardian: European-headquartered alternatives manager with a large secondaries franchise spanning LP-led and GP-led transactions globally. Overlaps with SQ Capital on GP-led continuation vehicles and LP-led secondaries across middle-market private equity.
- LGT Capital Partners: Swiss-based alternatives manager with a sizable secondaries practice (LGT Capital Partners' secondary funds), investing in LP-led fund secondaries and GP-led continuation vehicles. Comparable strategy and global LP base to SQ Capital.
- Blackstone Strategic Partners: Blackstone's dedicated secondaries platform, where Founder/CEO Mustafa Siddiqui previously led GP Stakes and CFO Petryczenko served as CFO. The most directly comparable franchise to SQ Capital given overlapping leadership pedigree and identical GP-led/LP-led strategy.
- Intermediate Capital Group (ICG) Secondaries: Publicly listed alternatives manager operating a dedicated secondaries strategy within ICG, active in LP-led and GP-led continuation vehicle transactions. Directly comparable buyer for SQ Capital's target deal types.
Market position
Strengths5 records
Weaknesses5 records
Competitive moat4 records
Key risks5 records
Key highlights6 records
Customer concentration
SQ Capital financial estimates
Financial estimateRevenue estimate
Valuation estimate
SQ Capital leadership team
Management profileNumber of profiles
Profiles11 records
SQ Capital funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
SQ Capital M&A and investment
M&A and investmentM&A
Investments1 record
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about SQ Capital
What does SQ Capital do?
SQ Capital is a secondaries investment firm that curates middle-market GP-led and LP-led secondary investments in private equity through a conviction-led approach. The firm manages a debut secondaries fund targeting $1 billion in AUM, deploying capital into continuation vehicles, single-asset CVs, and LP portfolio secondary transactions. Investment selection and pricing are supported by an internally-built, AI-native data science platform developed specifically for secondaries underwriting.
Is SQ Capital a public or private company?
SQ Capital is a private company. It is classified as founder individual operated bootstrapped and is currently operating.
When was SQ Capital founded?
SQ Capital was founded in 2025. It employs 11 to 50 people.
Where is SQ Capital based?
SQ Capital is headquartered in New York, United States, in the North America region.
How does SQ Capital make money?
One revenue line is on record: fund Management / Investment Management.
Who are SQ Capital's main competitors?
StepStone Group is listed as a broad incumbent. Direct peers are Lexington Partners, Aether Investment Partners, Coller Capital, CVC Secondary Partners, HarbourVest Partners, Ardian, LGT Capital Partners, Blackstone Strategic Partners and Intermediate Capital Group (ICG) Secondaries.
Does SQ Capital have an API?
No public API is recorded for SQ Capital.
What industry is SQ Capital in?
SQ Capital's product category is Private Equity Secondaries Investment. Its primary akta.pro industry code is FSANAFAL, Emerging Manager / Small Fund Secondaries, with a secondary code of FSAHALAC, LP Secondaries — Growth Equity Funds. Its NAICS code is 523940 and its SIC code is 6282.