Sigma Planning Corporation

Sigma Planning Corporation

Larry Carroll founded Sigma Planning Corporation in 1992 in Ann Arbor, Michigan, evolving it from a local accounting and financial planning firm into a sprawling financial services holding company. The Carroll family retains private ownership of the entity, which sits atop a collection of regulated entities including a FINRA-licensed broker-dealer and an SEC-registered investment advisor. Wealth accumulation is tied directly to the firm's long-duration consolidation of advisory fee revenue across multiple economic cycles. The firm's strategy is acquisition and affiliation, not direct portfolio management from a central balance sheet. Sigma operates as an intermediary platform and service bureau for independent financial advisors, offering them securities brokerage through its broker-dealer arm and fee-based asset management via its corporate RIA. Asset classes accessed through the platform typically include publicly traded equities and fixed income, private real estate investment trusts, structured private credit products, and annuities. Two highly visible strategic moves frame the firm's recent posture: the acquisition of a majority stake in a registered investment advisor network to deepen fee-based assets, and the integration of advanced tax optimization software for its advisors, a nod to its tax-preparation roots. The holding company serves several hundred financial professionals across the United States. While the firm does not publicly disclose aggregate advisory assets, industry estimates based on its FINRA-registered broker-dealer membership and RIA filings suggest a substantial but unverified pool of supervised assets. In early 2024, Sigma announced an executive promotion designed to streamline the leadership of its hybrid broker-dealer and RIA platform, signaling generational business planning beneath the Carroll family's control (per ThinkAdvisor, 2024). The firm maintains its headquarters in Ann Arbor, with operational hubs supporting remote advisors rather than a dense branch network. Sigma's structural differentiator is a tax-centric DNA running through a modern hybrid RIA aggregator. Unlike pure-play wealth managers that start with investment products, Sigma's origin in tax preparation means its advisor network is trained to subordinate product selection to after-tax return. This creates a multi-generational stickiness in client relationships that a standard broker-dealer architecture cannot easily replicate. The firm remains governed as a closely held Carroll family enterprise, insulating its strategy from public-market earnings pressure while competing with both large institutional aggregators and boutique RIA roll-up platforms.