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Domini & Sign Family Office
Mirco Signorell's Appenzell-based multi-family office deploys family capital across public and private markets with a ClimateTech and Energy Transition...
Domini & Sign Family Office
The firm was formed by Mirco Signorell, now Executive Director, and Walter Spiess, whose advisory careers gave them the long-standing client relationships that underpin the office. Domini & Sign concentrates the capabilities of previously separate specialized firms into one independent entity serving multiple families, founded on the premise that complex Swiss and international structuring requires an integrated advisory approach not a product distribution model. The source of its underlying capital is the entrepreneurial success of its founders in the Swiss fiduciary sector. The office manages a multi-asset portfolio spanning public equities, public debt, private equity, and real estate, supplemented by philanthropic and mission-related investments. Its investment focus is defined by five sector targets: ClimateTech, Energy Transition & Renewables, Healthcare Services, EdTech, and the Circular Economy. The investment geography includes developed markets in Europe and North America as well as exposures in Asia and Oceania. The office also holds non-traditional assets, including a managed family art collection and an intellectual property portfolio. Beyond pure investment functions, the firm provides cross-border estate planning, consolidated wealth reporting, and philanthropy coordination for its families. One of the founders, Walter Spiess, operates a linked philanthropic vehicle, the Walter Spiess Stiftung. The firm participates in the Verein Ombudsstelle Finanzdienstleister (OFD) for financial services ombudsman representation. No specific recent operational event from the last 24 months was publicly disclosed by the office. The office’s architecture is distinct because it operates essentially as a private, unbundled chief-of-staff for family wealth. It does not sell proprietary products or manage its own commingled funds. Instead, it relies on the concentrated expertise of a small group of senior advisors who have navigated the intersection of Swiss regulation and international family governance for decades, offering a stability that contrasts with banks' typical rotating relationship-manager model.
General information
Firm type
Multi Family Office
Year founded
2011
AUM
Undisclosed
Location
Region
Europe
Country
Switzerland
City
Appenzell
Corporate office
Sandgrube 29, 9050 Appenzell, Switzerland
Principals
Mirco Signorell
Executive Director & Partner
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 Domini & Sign?
Executive Director Mirco Signorell leads the firm alongside its founders. The office does not publish a separate CIO, reflecting its model where senior advisory partners collectively determine asset allocation and manager selection for each family. This structure is designed to keep the ultimate decision-making authority closely aligned with the founding advisory team.
Is Domini & Sign a single family office or a multi-family office?
Domini & Sign is a multi-family office. It was formed to serve several private families by consolidating the capabilities that its founders previously offered through separate specialized advisory firms. Its infrastructure supports coordinated cross-border structuring, investment oversight, and philanthropy for multiple unrelated families.
Where does the underlying wealth come from?
The wealth managed by Domini & Sign originates from its founders' long-standing client relationships built during their careers. Mirco Signorell is a Swiss wealth management and tax advisory professional who also leads VPZ Group. The firm itself acts as an independent administrator and advisor for capital created by its entrepreneurial families.
Does Domini & Sign operate any philanthropic structures?
Yes. Co-founder Walter Spiess established the Walter Spiess Stiftung, a private foundation linked to the office's ecosystem. Beyond this named foundation, the office explicitly coordinates philanthropy and mission-related investing as part of its integrated wealth management service for client families.
What is Domini & Sign's known posture on ESG?
ESG is a core formal framework for the office. Its confirmed sector focuses—ClimateTech, Energy Transition & Renewables, Circular Economy, Healthcare Services, and EdTech—indicate an investment style that screens for environmental and social impact. It applies this lens across public equities, private equity, and real estate.
Does Domini & Sign invest directly or through funds?
The office operates across both public and private markets, implying a mix of direct securities holdings, fund commitments, and direct private equity and real estate positions. It explicitly lists Public Equities, Public Debt, Private Equity, and Real Estate as active asset classes, suggesting an ability to allocate directly to managers and to single-asset opportunities.
How is Domini & Sign different from a Swiss private bank?
The firm operates as an independent advisory office, not a regulated bank or asset gatherer. Its marketing emphasizes integrated, unbiased counsel without proprietary product distribution. It is structured to serve as a family's permanent advisory back office in Appenzell, rather than as a transactional financial intermediary, and operates under a direct ombudsman membership rather than a banking license.
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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