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Carl M. Hennig
Carl M. Hennig, Inc. was established in Oshkosh, Wisconsin in 1989 after the Hennig family liquidated its founding stake in Oshkosh Truck Corporation, now...
Carl M. Hennig
Carl M. Hennig, Inc. was established in Oshkosh, Wisconsin in 1989 after the Hennig family liquidated its founding stake in Oshkosh Truck Corporation, now Oshkosh Defense — the manufacturer of specialty military and emergency vehicles that traces its roots to 1917. The family office grew out of a classic Midwest industrial-to-real-estate transition, converting the proceeds of the share sale into a concentrated portfolio of income-producing properties and private debt instruments across the state. The firm deploys capital across three principal buckets. Commercial real estate forms the core, concentrated in Wisconsin industrial, office and retail assets — confirmed properties include the Westowne Plaza shopping center in Oshkosh and a portfolio of net-leased Dollar General locations. A direct private credit sleeve provides seller financing and first-position mortgages to regional real estate operators, operating at the intersection of hard-money lending and relationship banking. The most recent buildout is a solar energy platform that develops utility-scale photovoltaic projects on family-owned land, reflecting a structural pivot toward infrastructure-style energy exposure without third-party LP constraints. The firm remains lean — a single-family office with no disclosed professional headcount, no additional offices, and no adjacent foundation arm. Carl M. Hennig is the sole named principal on all public filings, including the firm's RIA registration, which governs the mortgage lending entity. In August 2023, Hennig Solar LLC, an affiliated entity, secured a $2.8 million USDA Rural Energy for America Program grant to build a 2.5-megawatt solar array in Winnebago County (per USDA, August 2023), confirming an ongoing operational cadence in renewables development. The structural edge is not sourcing or scale but mandate. The firm operates outside the quarterly-reporting pressure of institutional LPs and avoids the competitive bidding that defines coastal multi-family offices. This allows for indefinite holding periods on real estate and mortgage assets, with solar development layered on as a patient-capital alternative that most single-family offices treat as philanthropy rather than an integrated return stream.
General information
Firm type
Single Family Office
Year founded
1989
AUM
Undisclosed
Location
Region
North America
Country
United States
City
Oshkosh
Corporate office
Oshkosh, WI, United States
Principals
Carl M. Hennig
Founder and President
Sector focus
Frequently asked questions
How did the Hennig family office originate?
The family office formed from the sale of the Hennig family's founding stake in Oshkosh Truck Corporation, the specialty vehicle manufacturer now known as Oshkosh Defense. Carl M. Hennig incorporated the single-family office in Oshkosh, Wisconsin in 1989 to manage the proceeds of that liquidity event. The firm's investment posture reflects a direct reinvestment of industrial wealth into regional real assets.
What is the firm's exposure to solar energy?
Carl M. Hennig, Inc. operates an affiliated entity called Hennig Solar LLC, which develops utility-scale photovoltaic projects on family-owned land in Wisconsin. In August 2023, the entity was awarded a $2.8 million grant from the USDA's Rural Energy for America Program to build a 2.5-megawatt array in Winnebago County. This positions the firm as a developer-owner rather than a passive tax-equity investor.
Does the firm invest in funds or only direct deals?
The firm structures investments directly — there is no public evidence of fund commitments, fund-of-funds allocations, or placements into external GPs. The mortgage lending arm makes direct loans to regional real estate operators, the commercial property portfolio is directly owned, and the solar platform is developed on family-held land. This suggests a wholly direct-deal posture with no intermediary layer.
Is Carl M. Hennig, Inc. a registered investment advisor?
Yes. The firm maintains an RIA registration with the SEC under CRD number 110689, filed through the mortgage lending entity. The registration covers the private credit operations, not advisory services for external clients — it is a compliance structure to govern the direct lending book rather than a third-party wealth-management business.
What explains the firm's concentration in Wisconsin?
The portfolio is anchored to the geography of the original Oshkosh Truck operations and the Hennig family's Wisconsin roots. All known real estate holdings — including Westowne Plaza and the Dollar General net-lease portfolio — are in Wisconsin, and the solar development footprint is within Winnebago County. The firm has not disclosed any out-of-state real estate or multi-regional expansion plans.
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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