F5 Financial Planning

F5 Financial Planning

Founded in 2011 by Mark Weisleder, F5 Financial Planning operates as a fee-only registered investment advisor in Naperville, Illinois. The firm serves individual clients and high-net-worth households, structuring its practice around integrated financial planning rather than product distribution. Its service model spans retirement income planning, tax-aware portfolio construction, and cash-flow management, positioning the firm as a planning-first rather than sales-first advisor. The firm's investment approach relies on passive and factor-based strategies executed through low-cost ETFs and index funds, with client portfolios tailored to risk capacity and time horizon. Asset-class coverage typically spans US large-cap equities, international developed-market equities, fixed income, and alternatives exposure via publicly traded REITs or interval funds. F5 does not operate proprietary funds or direct private-market vehicles. The geographic focus is heavily concentrated in the western Chicago suburbs, with client relationships centered in DuPage, Will, and Kane counties. The firm's structure is intentionally lean. There is no known affiliated philanthropic entity, private foundation, or adjacent operating business. In keeping with its fee-only designation, the firm eschews commission revenue entirely, a posture that aligns client incentives with ongoing planning fees or assets-under-management billing rather than transactional brokerage. F5's structural distinctiveness lies in its tax-integrated planning framework. The firm explicitly couples investment management decisions with forward-looking tax projections — a service bundle more typical of multi-family offices and CPA-adjacent firms than a suburban RIA. This architecture places F5 in a small cohort of fee-only planning firms that treat tax modeling as a core advisory competency, not an outsourced afterthought.