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Portage Partners
Portage Partners was established in 2010 as the family office for Michael Leffell. Leffell previously served as deputy executive managing member at the...
Portage Partners
Portage Partners was established in 2010 as the family office for Michael Leffell. Leffell previously served as deputy executive managing member at the event-driven hedge fund Davidson Kempner Capital Management. The firm has since expanded to serve additional active and semi-retired investors while retaining its New York headquarters. The firm allocates across alternative funds, direct co-investments, private equity, private credit, real estate and litigation finance. Confirmed positions include holdings tied to 10 East 53rd Street, Project Slope in Brooklyn, Project Leeward, Project Arizona, Project Mainsail and Project Round. Investment stages span seed through series C and growth equity. Geographies include North America, Europe, the Middle East and Central Asia, and Oceania. Asset-class exposure also covers FinTech, InsurTech, Gaming, Mobility & Transportation, LegalTech, PropTech and Workflow Automation. Portage Partners employs a partnership model that sources and monitors opportunities for its client families. The team includes Chief Investment Officer Sam Klatt at the affiliated 10 East platform and Strategic Advisory Board member Ted Seides. Michael Leffell also serves on the Board of Advisors of JINSA and as Lifetime Trustee of The Leffell School. The Lisa and Michael Leffell Family Foundation operates as the family's separate philanthropic vehicle. No operational events from the last 24 months appear in available records. The firm's structure separates the original Leffell family capital from the broader multi-family client base through a non-discretionary advisory model. This arrangement allows the firm to maintain institutional processes while serving semi-retired investors who retain final decision rights on commitments.
General information
Firm type
Multi Family Office
Year founded
2010
Location
Region
North America
Country
United States
City
New York
Corporate office
10 East 53rd Street, 18th Floor, New York, NY 10022
Principals
Michael Leffell
Founder and Managing Member
Altss tracks 2 additional named team members for this firm — including direct investment leads, IR, and operating principals not listed on the public website.
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Frequently asked questions
Who runs investment decisions at Portage Partners?
Michael Leffell serves as Founder and Managing Member. Sam Klatt acts as Chief Investment Officer at the affiliated 10 East platform. Ted Seides sits on the Strategic Advisory Board for 10 East.
How does Portage Partners source proprietary deal flow?
The firm uses a non-discretionary partnership model to evaluate alternative funds and direct opportunities. It applies institutional due diligence processes developed from Leffell's prior experience at Davidson Kempner.
Is Portage Partners structured as a single family office or does it operate more like a venture firm?
Portage Partners began as the family office for Michael Leffell and has developed into a multi-family office serving additional active and semi-retired investors through a non-discretionary platform.
Does Portage Partners participate in fund commitments or only direct deals?
The firm allocates to alternative funds, direct co-investments and SPVs, private equity, private credit, real estate and litigation finance.
What investment stages does Portage Partners typically target?
Confirmed stages include seed, series A, series B, series C and growth equity.
Where does the underlying wealth come from?
The firm originated with capital from Michael Leffell following his retirement from Davidson Kempner Capital Management.
Does Portage Partners maintain philanthropic structures, and how are they separated?
The Lisa and Michael Leffell Family Foundation operates separately from the investment platform.
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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