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Sunstone Credit
Sunstone Credit was established to provide specialized financing for commercial solar installations, a segment co-founder Josh Goldberg identified as...
Sunstone Credit
Sunstone Credit was established to provide specialized financing for commercial solar installations, a segment co-founder Josh Goldberg identified as underserved during his tenure as an installer and developer at Astrum Solar. The firm was built by a leadership team that combines operating experience in solar sales and installation with backgrounds in structured finance from institutions including Barclays, UBS, Goldman Sachs, and Truist. The company maintains offices in Portland, Baltimore, and Teaneck. Sunstone offers direct loans to businesses for onsite solar systems, covering the full project cost — 100% financing — with no prepayment penalties. The loan book spans a variety of asset classes, primarily private credit instruments secured by commercial solar installations. The firm serves borrowers across sectors including manufacturing, agriculture, and retail, with an emphasis on small and medium-sized enterprises. Geographic coverage is national, with developer partners operating in multiple US regions. Sunstone's proprietary digital platform integrates directly into solar installers' sales processes, providing real-time underwriting updates. The leadership group includes eight principals with roles spanning technology, underwriting, legal, and capital markets. Sunstone does not publicly disclose AUM or loan book size. Sumbul Alvi leads the firm's technology and digital platform development, while Jim Barber oversees credit and underwriting. Susan Tanski, formerly of Sustainable Opportunities Acquisition Corp. and Goldman Sachs, focuses on financing solutions. Sunstone's structural distinction lies in its hybrid operating model — it is a technology company that directly originates and services loans, effectively acting as both a software provider for solar installers and a non-bank lender. This vertical integration gives it control over the financing stack, from borrower application through funding, a posture that differs from pure-finance lenders or third-party loan origination platforms.
General information
Firm type
Asset Manager
Year founded
—
AUM
Undisclosed
Location
Region
North America
Country
United States
City
Portland
Corporate office
Portland, Baltimore, Teaneck, United States
Additional offices
Baltimore, MD · Teaneck, NJ
Principals
Josh Goldberg
Co-Founder
Sumbul Alvi
Co-Founder
Ashley Cox
Legal
Mike D'Andrade
Lending Operations
Duncan Hinkle
Partner Management
Scott Muckleroy
Capital Markets & Product
Susan Tanski
Finance & Strategy
Jim Barber
Credit & Underwriting
Sector focus
Frequently asked questions
Who runs investment and credit decisions at Sunstone Credit?
Credit and underwriting are led by Jim Barber, who brings over 15 years of lending experience from Truist, Silicon Valley Bank, and Fifth Third Bank. The leadership team operates with a flat structure, with Josh Goldberg providing strategic direction and Duncan Hinkle managing installer partner relationships. Product and capital markets strategy is overseen by Scott Muckleroy, who previously worked in investment banking at Barclays and UBS.
What types of solar projects does Sunstone Credit finance?
Sunstone focuses exclusively on onsite commercial solar installations for businesses. Loan sizes range from $50,000 to $6 million with terms between 5 and 20 years. The firm provides 100% financing with no prepayment penalties, targeting small and medium-sized enterprises across sectors including manufacturing, agriculture, and retail.
How does Sunstone Credit source its deal flow?
Sunstone originates loans through a network of solar installers, developers, and EPCs who integrate the firm's digital platform into their sales process. Installers submit borrower applications through Sunstone's system, which provides status updates as underwriting progresses. The firm does not currently disclose the total count of installer partners.
Is Sunstone Credit a lender or a technology platform?
Sunstone operates as both. It directly originates and services commercial solar loans while providing a white-labeled digital platform that solar installers use to manage financing applications. This hybrid structure means Sunstone controls the full financing stack — borrower application, underwriting, and servicing — rather than acting solely as a loan marketplace or software vendor.
What is Sunstone Credit's credit underwriting philosophy?
Sunstone evaluates borrower creditworthiness based on the business's financial profile, not the terms offered by the installer. Interest rates vary by loan term, with multiple rate options available so installers can select products matching their local market. The firm does not disclose specific credit criteria publicly but states it assesses partners on a case-by-case basis.
Profile maintained by Altss using OSINT (open-source intelligence), regulatory filings, licensed data partners, and verified direct submissions. Read the methodology. Last updated: . Continuous refresh with full update cycles at least every 30 days.
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