Sullivan

Sullivan

Sullivan does not publicly disclose its founding year or the origin of its wealth. The firm lists no named principals, no AUM, and no explicit assets on its bare-bones website at sullivaninternet.com. Based on its Sioux Falls headquarters, a city with significant insurance and financial services presence, Sullivan may have emerged from enterprise software or internet-related wealth. Investment strategy is inferred from the firm's subtle technology orientation—the domain name suggests internet or software roots. Likely asset classes include private equity, private credit, and real estate, but no direct deals or portfolio companies have been publicly confirmed. No known partnerships with external GPs or co-investors are on record. The firm employs an undisclosed number of professionals and operates from a single Sioux Falls office. No philanthropic foundations, operating businesses, or industry club memberships (e.g., Tiger 21) have been publicly linked to Sullivan. There is no dated recent activity available from the last 24 months. Sullivan's structural differentiator is its near-total public silence—a deliberate institutional privacy that distinguishes it from peer family offices that maintain communication channels. This opacity may reflect a single-family office serving a single family that values confidentiality above all, but no successor or governance details are on record.